201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC

201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC
201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Hindustan Cleanenergy Limited
NEW DELHI, INDIA
REQUEST FOR PROPOSAL (RfP)
For
4x55 MW (DC) Solar Photovoltaic Power Project in Tamil Nadu, India
RFP: 201504/HPSPV/Tamil Nadu
April 30, 2015
VOLUME-2
SCOPE OF WORK & SYSTEM TECHNICAL SPECIFICATIONS
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
PROJECT: Setting up of 4x55 MW (DC) Solar Photo Voltaic Grid Connected Power Plants
1.0
Qualification Criteria:
Technical Qualification Criteria
i. The Bidder should have engineered, supplied and commissioned grid connected solar PV projects with a
cumulative capacity of 200 MW or above in India which is in successful operation, as on the date of Bid
submission; OR
ii. The Bidder is an EPC Contractor that has completed projects with cumulative project cost of Rs. 2000
Crore (INR Twenty Thousand Million) in a “core sector” as on the date of Bid submission. The Bidder must
have an experience in Solar Sector with commissioned Solar PV power projects of minimum 20 MW
capacity at a single location. For the purpose of this sub-clause, “core sector” would be deemed to include
power, telecom, ports, airports, railways, metro rail, industrial parks/ estates, logistic parks, pipelines,
irrigation, water supply, sewerage and real estate development.
Financial Eligibility
The annual turnover of the Bidder should be equal to or more than Rs. 1500 Crore (INR Fifteen Thousand
Million) during any of the last four financial years.
2.0
Basic Scope of Work
Scope of work shall include designing, planning, engineering, procurement (manufacturing /
supply), construction / erection, testing, commissioning and Five (5) years of operation and
maintenance of 4 X 55 MW (DC) utility scale solar PV plant as a turnkey contract according to
terms and conditions set out herein.
The turnkey contract shall be in accordance with all applicable regulations and permits so that
the solar PV plant fulfils the feed in tariff requirement by TAMILNADU GENERATION AND
DISTRIBUTION CORPORATION LTD (TANGEDCO) guaranteed performance and the technical
specifications as specifically mentioned under this RFP. The turnkey development of solar PV
plant by the turnkey EPC contractor shall essentially include:
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Basic project planning, sequencing and scheduling, solar resource assessment, energy yield
predictions for project life cycle, basic and detailed designing, project component selection,
preparing engineering and construction drawings, obtaining permissions, and all other
requirements as required for commissioning and interconnecting the solar PV plant to
transmission utility grid including engineering, supply and construction of 110 kV transmission
line from project switchyard to Grid Sub-Station alongwith extension of bay and extension works
at sub-station control room.
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Manufacturing, supply, sourcing, procurement, transportation of all solar PV plant equipments,
required insurance, electrical components, structural components, civil engineering material,
mechanical engineering components, earth moving equipments, construction machinery and all
other construction equipments as required for development, implementation, construction,
testing, commissioning and interconnection of the utility scale solar PV plant to transmission
utility grid.
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
3.0
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Arranging for power and electricity during construction, obtaining permits and approvals from
all local stakeholders, government statutory bodies, obtaining permissions from electrical
inspectorate, liaison with transmission utility for evacuation infrastructure, relay testing and
charging of transmission lines as required for completion and commission of plant.
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Site preparation and land levelling, providing construction infrastructure like site office, internal
roads, stores etc, assembly and construction of the entire solar PV plant, all pre construction
tests, site management and supervision, labour provision, testing and commissioning of all the
equipments in steps and commissioning and interconnection of the utility scale solar PV plant to
transmission utility.
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All the operations not expressly included, that are necessary for proper functioning of the solar
PV plant and fulfillment of the guaranteed performance, rules, regulation, and applicable codes,
being the meaning of necessarily all these things which are inherent to the Project and without
which the solar PV plant would be unable to start operating commercially.
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Commissioning of the solar PV plant, with provisional acceptance tests, 7 days start-up
performance test, monthly and quarterly performance evaluations and performance tests as
required by the owners during the defects liability period.
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Comprehensively warranting the entire solar PV plant against all defects through a defects
liability period (DLP) of five years, transfer all component warranties to the owners post
completing the DLP, proving guarantees monthly performance ratio (PR) values for five (5)
years.
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Operation and maintenance (O&M) of the entire solar PV plant for a period of Five (5) years
from the date of commissioning and supplying all the required spares recommended by
respective manufacturers of all project components during O&M period.
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Training owner’s personnel for operation and maintenance, handing over the plant to owner,
provision of all the documentation necessary for the correct performance and maintenance for
the life cycle time of solar PV plant.
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The bidder will guarantee monthly Performance Ratio (PR) values. These values would be
measured on daily basis through SCADA. For contractual purpose, the penalty would be levied
on the bidder on the basis of annual PR having not met. Monthly PR would become a
basic/milestone for joint-gap analysis, identifying, improvement opportunities & implementing
corrective actions and measures. This process will be followed for the duration of the O&M
services being provided by the bidder.
Project Overview
The site is located in Kariapatti Taluk, Near Tiruchulli, Distt Virudh Nagar in the State of Tamil
Nadu, South India.
3.1
Site Overview
Land: Site is having land area of approximately 1000 acres available for all the four (4) projects
of 55 MW (DC) each. The land is fairly flat and does not have significant undulations.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Geotechnical investigation and topographic survey shall be part of the bidder’s scope.
Construction power: Contractors are required to make their own arrangement for sourcing
power in this regard. Owner shall not be liable for any charges on power consumption.
Construction water: Contractors are required to make their own arrangement for sourcing
water in this regard. Owner shall not be liable for any charges on water consumption.
3.2
PV Plant Overview
In view of Indian climatic conditions, Owner essentially has selected Crystalline Silicon (CrSi) /
Thin Film technology for its 4x55 MW (DC) solar PV plant.
In order to minimise DC ohmic losses, inverters, MV transformers and switchgear shall be
centrally located within the modular plot. MV transformers shall step-up the voltage to 11kV. In
order to achieve system redundancy, at MV level set of four and three modular plots shall form
ring mains before feeding into HV substation. 11kV AC voltage is further stepped up to 110kV by
Two nos. 25MVA ONAN transformers at the HV substation before feeding into the TANGEDCO
grid. The point of interconnection and metering shall remain at solar PV plant. The HV
substation including the switchyard and metering shall be in the scope of turnkey EPC contract.
3.3
Electrical Characteristics
DC System: This shall essentially be applicable from solar PV upto the inverter. The operating
voltage of inverters shall essentially depend upon the MPPT range; however the maximum
system voltage should be less than 1000V.
LV System: AC Low Voltage System post inverter shall again linked to inverter specifications;
however the output power should have three phases with a nominal frequency of 50Hz.
MV and HV System: AC Medium and high voltage shall be interpreted as 11kV and 110kV.
Internal AC grid networks shall be at 11kV and the power evaluation to TANGEDCO substation
shall be at 110kV level.
3.4
Climatic Conditions
There has been no onsite weather monitoring done, desktop assessment indicates following
conditions may be considered by bidders for their project component selection and system
designs.
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Ambient temperature: upto 48°C, all equipments shall be designed for 50°C ambient.
Open storage temperature: upto 48°C.
Humidity: upto 98RH%
Basic wind speed: 39m/s
Seismic location: Zone II
System design should be as per prevailing site conditions, seismic zone, wind zone per applicable
IS codes.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
4.0
Contractor and Owner Obligations
4.1
Owner’s Basic Obligations
The owner shall be obliged to:
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4.2
Sign Power Purchase Agreement with TANGEDCO.
Avail permission/feasibility for power evacuation to TANGEDCO transmission utility/Sub
Stations.
Handing over acquired land for solar PV project development to the selected turnkey EPC
contractor along with onsite marking of boundaries. Obtain clearance / approvals / CLU if
necessary.
Should appoint quality assurance personnel to witness tests on the all necessary plant
equipments prior to the supply / procurement as mentioned in this agreement
Appoint owner’s engineer / independent technical consultant for reviewing project designs,
detailed engineering, drawings, equipment specifications and all project management
documents provided by contractor.
Bear all statutory fees and undertake responsibility to obtain and maintain authorization for
interconnecting the plant to transmission utility.
Maintain cash flow of the project and make payments to the contractor after satisfactory
completion of its obligations as specified in other sections of this RFP.
Turnkey EPC Contractor’s Basic Obligations
A successful bidder shall be referred as ‘Contractor or EPC Contractor’, who has won the
contract. In addition to obligations of contractors specified elsewhere in other sections, the
turnkey EPC contractor shall be bounded by the following basic obligations.
a. Adherence to all the terms and specifications under various sections of this RFP document is
essentially a key obligation of the EPC contractor.
b. Bidders shall independently conduct resource assessment and predict energy yields clearly
specifying losses and degradation over project lifecycle. Owner shall closely monitor these losses
and degradation, and shall link with project performance.
c. Wherever standard codes are provided in the document, stringent codes shall be followed by
the contractor; wherever codes are not mentioned, latest relevant IS, NEC and IEC codes shall be
followed.
d. The project being a turnkey contract, scope shall include everything as required for successful
implementation, commissioning and operating the plant for its lifecycle of twenty five years. No
variation shall be entertained on this account by the owner.
e. Contractor shall perform works strictly adhering to technical documents and drawings approved
by the owner as well as requirements established by the applicable technical regulations.
f. Contractors shall follow and perform all works in accordance to this technical document, Tamil
Nadu solar policy, power purchase agreement and TANGEDCO project requirements etc.
g. Contractors shall strictly follow the start-up and functional requirements of the project as
presented in this document. This shall essentially include all the material and construction
equipment supply, implementation, testing and commissioning of the relevant systems as
required for successful completion, commissioning and 5 years of O&M.
h. Obtain CEIG permission for COD and related liaison works.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
5.0
Project Start Up and Functional Requirements
The start-up and functional requirements shall essentially meet all the supply, installation,
testing and commissioning by bidders as required to complete the job. Following are the non
exhaustive requirements that shall be offered by bidders.
5.1
Site Preparation
Topographical survey and geotechnical investigations shall be conducted by the EPC contractor;
following which all the actions required are to be implemented and completed by the
contractor.
The site preparation shall include all the work as required for installation of a utility scale solar
PV plant as per international practices. This shall essentially include but not be limited to:
Earthwork: Following the site visit prior to bidding and based on previous experience, bidders
are expected to estimate the volume of earthwork required. Site may require:
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Clearing of weeds, chopping down of small bushes and trees.
Levelling of land with excavation and back filling of soil.
Movement of soil for levelling within the site or by bringing soil from outside.
Grading the soil with appropriate slope, this may be clear subsequent to topographical survey.
Construction of culverts on cross flow, if required.
Compaction of minimum 98% shall be required for finish.
Rock blasting, if necessary and required.
Roads and Pathways: As a part of site preparation, all roads shall be designed and constructed
by EPC Contractor to allow smooth on site transportation and delivery of all project components
to installation location and heavy equipments to their respective work locations.
Site Office and Material storage: Owner shall not be liable for any on site infrastructure. EPC
contractors shall have their own onsite project management office and site warehouse for
material storage with required security. Maintaining the hygiene, EPC contractor shall have
adequate mobile toilets at multiple locations within the site.
Fencing: As a part of site preparations EPC contractors shall complete the perimeter fencing and
have adequate security guards before delivering any material on site. The fencing shall be a
combination of chain-link and barbed wire on steel posts of height minimum 2.5 meter above
the ground and spacing 2.5 meter between adjacent posts.
5.2
Weather Stations
EPC contractor shall provide a weather station to provide adequate meteorological data to
evaluate system performance. Station shall essentially include sensors but not limited to
monitoring of global irradiation on tilted plain, global horizontal irradiation, ambient
temperature, wind speed and direction and relative humidity.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Dedicated pyranometers shall be used for measurement of global irradiation on tilted plain and
global horizontal irradiation. Only CMP-II, Kipp & Zonen make pyranometers shall be used in
weather station.
Weather station along with data logger (Recording resolution of 1 minute) shall be located at
strategic point and shall be capable of collecting the data points and sample frequency. The
weather Station shall have capability of recording and storing environmental data without AC
power for two (2) days.
5.3
Vigilance System
The entire PV plant, control rooms and switchyard will be monitored by CCTV (close circuit TV)
system. The entire PV plant area shall have PTZ (pan, tilt and zoom) type camera with night
vision. Cameras in other areas can be dome type. The Close Circuit Television System shall
provide an online display of video images and record onto a separate digital video recorder
(DVR) that could be located in the main control room or at a central security office anywhere
else within the building. All controls that are required for panning, tilting, zooming and for
replay of events in video formats shall be done from a desktop computer using separate Digital
Video Manager Software. DVR shall support video motion detection (VMD) type of recording so
that recording of unwanted data can be avoided thereby increasing the backup duration and
disk storage capacity. The DVR shall be capable of holding the backup of all the cameras for at
least two weeks.
5.4
Internal Roads and Pathways
All roads shall be designed and constructed to allow smooth on site transportation and delivery
of all project components to installation location and heavy equipments to their respective work
locations. At all cable crossings, Hume pipes of appropriate sizes shall be embedded within the
road. Roads shall be constructed at minimum 250mm above ground with required cutting of
soil, grading to the given slopes, backfilling and due compaction. All the Main approach and
internal roads shall be WBM type as per relevant standards. Minimum width of main approach
road and internal roads shall be 4.5m and 3m respectively.
5.5
Inter-Row Spacing for PV Mounting Structures
In addition to optimizing the inter-row pitch for minimum shading, adequate inter-row spacing
shall be maintained for cleaning of modules. Although this will depend on the strategy adopted
for module cleaning, a minimum of 2.5 meters of inter-row space shall be maintained
throughout the solar PV array area.
5.6
Fencing
The Solar PV plant including array yard, control room & switchyard along with security cabins
shall be fenced with chain-link and barbed wire on Y steel posts above chain-link fence with a
minimum height of 2.5 meter above the ground and spacing 2.5 meter between adjacent posts.
Diagonals shall be stretched between adjacent poles. Fencing shall be provided with main
entrance gates at two locations with 6m single leaf sliding doors. A wicket gate adjacent to the
main entrance shall be provided for ease of movement.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
5.7
Lightning Protection System
The entire PV plant area including all buildings will be protected from lightning. The protection
system will be based on early streamer emission lightning conductor air terminals. The air
terminals shall provide an umbrella protection against direct lightning strike covering a radial
distance of maximum 60m. The air terminal will be capable of handling multiple strikes of
lightning current and should be maintenance free after installation.
The earthing stations for the lighting discharges shall be provided with test links of phosphorus
bronze and located at 150mm above ground level in an easily accessible position for testing.
5.8
External Lighting System
All the main and internal roads shall be lit with external lighting system strategizing site security
and maintenance requirements; utmost care should be taken for avoiding any shading effect
due to the poles. The light fittings shall be highly efficient having longer life. LED based system
shall be used. Flood lights may be mounted at strategic locations along the boundary of the PV
plant.
Minimum of 10 lux shall be maintained around the periphery of modular unit control rooms and
4 – 6 lux at the main roads approaching modular unit control rooms. All the light shall be fed
from auxiliary power supply system available at the plant.
5.9
Water Supply and Drainage System
The solar PV plant shall have independent underground water tanks at minimum two strategic
locations. Each tank shall have a minimum capacity of 150 kl. Water source for these tanks shall
be from bore wells (4 nos of 50 m head each). The water supply system shall be complete with
adequately sized electrical pumps and a standby for each type. Water supply system shall
include all the pipes, valves and plumbing works as required to complete the system.
Each solar PV plant shall have a minimum of 6 toilets attached to any modular unit control
rooms or at the main control rooms. These shall have its independent septic tank water supply
connection and required water storage tank with all piping and plumbing works.
Bidders are expected to study the site topography and plan the surface drains accordingly.
Utmost care shall be taken to maintain slopes and to prevent water clogging at the site. Proper
water drain channels with RCC Hume pipe culverts shall be designed wherever necessary. The
water drains shall have an outlet at a suitable location on the plot periphery to connect with the
Government of Tamil Nadu storm water drainage network, if any.
5.10
Fire Fighting and Detection System
The solar PV plant shall be equipped with suitable fire protection and fighting systems for entire
PV array area, all control rooms and switchyard as per the NFPA fire safety standards and local
fire authority requirements. Fire fighting of transformers and other electrical equipments as
required shall be in accordance to tariff advisory committee, CBIP, IS 10028, NFPA 70 and NFPA
15.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
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Fire Extinguishers: Portable type fire extinguishers conforming IS10658 shall be provided as
means of dealing effectively and immediately with fire caused from oils, solvents, gases, paints,
varnishes, electrical wiring and all flammable liquids and gases. System shall comply with
required insurance norms. Following type of portable fire extinguishers shall be provided in PV
array area, modular plot control rooms and main control room.
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DCP type fire extinguisher 10kg capacity.
CO2 operated hand portable extinguisher 9kg Capacity.
Foam type hand portable extinguisher 9kg capacity.
Additionally two 75 litres, CO2 operated, trolley mounted fire extinguishers having a minimum
jet range of 8m shall be provided. These shall be placed in the main control room. All the fire
extinguisher shall be subjected to anticorrosive treatment and shall be painted and marked as
per requirement of relevant standards.
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Fire buckets: Fire buckets shall be provided in all modular unit control rooms with fine sand and
fixed on an angle iron frame as per requirement of local authorities. Fire buckets shall be
painted red with additional handle at the bottom.
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Automatic fire detection cum alarm system shall be provided in all modular unit control rooms,
main control rooms and administration building. Fire detection and alarm system shall be
integrated with required cabling to a single fire alarm control panel. Fire detection alarm system
shall include alarm initiating multi sensor type smoke detectors. The entire system shall work on
auxiliary power supply. In case of power failure, the complete system shall function in normal
condition on maintenance free back-up batteries for a minimum period of 48 hours duration.
Manual call points and hooters shall be provided for all the modular plot control rooms. These
shall be further integrated with fire alarm control panel in main control room.
5.11
Monitoring and SCADA System
The power plant shall incorporate a communication system to monitor the output of each string
and inverter so that system faults can be detected and rectified before they have an appreciable
effect on production. The monitoring system will be a web based internet portal solution. Data
loggers shall be used to collect data from the weather station, the inverters, meters, and the
transformers to transfer data once a day to a server which will carry out key functions:
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All the String combiner boxes, inverters, MV Switchgear, switchyard equipment and utility
metering shall be integrated with SCADA system.
EPC contractor shall provide the configuration of the proposed SCADA system along with
Supervisory Station which refer to the server and software responsible for communicating with
the field equipments, and then to the HMI software running on workstations in the control
room, or elsewhere.
The SCADA system shall be composed of an integrated operator human-machine interface
(HMI), input/output (I/O), remote telemetry units (RTU), PLCs communication infrastructure and
software.
An industrial Ethernet LAN shall be distributed throughout the field for communication to field
devices.
The data acquisition shall be through a desk top computer of latest configuration.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
EPC contractor shall provide external communications link to Owner to access all data
acquisition and real time performance monitoring. Contractors shall provide all necessary
hardware as required for entire setup. The recorded data shall be sequential right from string to
metering. The data shall be compatible and transferable to MS Office excel. Source of power for
SCADA system and all related hardware shall be from auxiliary power supply. An additional UPS
having a minimum 4 hours backup shall be provided dedicatedly for this system. In addition to
conventional parameters (V, I, KW, KVA, KVAr etc.) below is the non exhaustive list of
monitoring and recording parameters.
Plant:
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String parameters
String failure detection
Power generation at interconnection
Daily power generation in kWh
Monthly power generation in kWh
Annual power generation power in kWh
Power generation from the date of commissioning
Plant Performance Ratios:
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Instantaneous PR (Current value)
Day’s average PR
Month’s average PR
Quarterly average PR
Annual average PR
Facility Performance Ratio, since commissioning.
Meteorological
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5.12
Global Horizontal Irradiation GHI / Global In-Plane Irradiation
Ambient air temperature
Module temperature
Wind speed and direction
Auxiliary Power Supply System
A 250kVA step down transformer substation including all cabling shall be supplied and
constructed by the contractor and tapping shall be from its own 11 kV switchgear and the
auxiliary power supply for the inverters shall be tapped from individual inverters at its output.
5.13
Civil Infrastructure
5.13.1 CONTROL ROOMS
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National Building Codes (NBC) and all relevant Indian Standards (IS) required for civil works shall
be strictly adhered to. Civil works required for construction of control rooms shall include, but
not limited to the following:
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
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RCC work shall essentially involve appropriate mix and cement reinforcement in accordance
with relevant standards. High strength reinforcement shall be used. Industrial best practices
shall be followed for bending and fixing of bars for concrete reinforcement. Minimum plinth
level of 0.6m from actual ground shall be maintained for all the control rooms.
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Watch Towers : For site security min 6 nos watch towers to be constructed at strategic locations,
so that their shadows do not fall on the modules.
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Masonry work; shall be performed using appropriate class of bricks. Bricks shall be soaked in
fresh water for a minimum of two (2) hours. Masonry works shall have suitably mixed cement
mortar. After completion, masonry work shall be kept moist for a minimum of week.
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Doors and Windows; Doors of all air-conditioned areas shall be of aluminium framework with
glazing, whereas, doors for toilet areas shall be steel framed. The main door shall be of mild
steel, single leaf type. All doors shall be at least 2.1m in height and 1.2m in width. A 0.75m wide
door shall be sufficient for toilets. All windows shall be solid bronze polished and suitably
painted after fabrication in accordance with relevant IS. RCC sunshade shall be provided over
external walls and windows.
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Glazing; shall be of minimum 4mm thick float glass, plain or tinted to avoid solar radiation. The
glass should be free from distortion and thermal stress.
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Plastering; shall be completed on all exterior and interior walls as per relevant IS codes.
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Flooring; shall be prepared as specified by Owner’s Engineer in charge.
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Roofing; of control room shall consist of RCC slab treated with water proofing.
Roof shall be smoothened and built for efficient rain water disposal.
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Painting; shall be carried out using approved quality, chemically resistant paint with anti fungal
quality. Primer shall be followed by minimum two coats of paint.
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Plinth Protection; with brickbats and PCC shall be provided.
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Stairs; shall be provided externally for accessing the roof for maintenance of Overhead tank and
other equipment.
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Plumbing and Sanitary; Wash rooms shall include western or Indian type WC, urinal, wash basin,
mirror, towel rail and soap holder. All the fittings shall be chrome plated. Bidders shall make
provision for one septic tank and two soak pits below ground for each toilet.
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Office furniture; wherever required shall be of top quality and chosen in such way that it blends
into aesthetics of the room.
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Water supply; GI/MS pipes shall be used for water supply and plumbing works.
Piping shall include all the required valves, stop cocks etc.
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Main control room for Plant: Main control room shall be an integrated building for comprising
of following:
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MV switchgear room: 2500Sq.ft.
SCADA room: 400Sq.ft.
Administration room: 1500Sq.ft.
O&M staff room: 700Sq.ft.
Store room: 400Sq.ft.
Pantry: 200Sq.ft
Water closets: 6nos. (4male and 2 female)
Bathrooms: 3nos.
This shall also include overhead water tank of 2000 litres, adequately sized septic tank and
required wash basins. MV switchgear rooms shall be provided with mechanical ventilation
system having minimum of 8 air changes during normal condition and 30 air changes in the
event of fire. Exhaust fans shall be hooked to fire detection system. Administration, SCADA and
staff rooms shall be provided with energy efficient comfort air conditioning system with a
nominal operating temperature of 23 Deg C and shall comply with all ASHRAE standards.
Internal electrification with minimum illumination of 400lux shall be maintained in all control
rooms.
In addition, Pre-engineered building / prefab structures for Main Control Room, Inverter room
may also be considered.
6.0
Resource Assessment and Energy Yield
EPC contractors shall be legally bound for a plant performance committed during the submission
of techno-commercial bids. Long term energy yield prediction for the defects liability, warranty
and O&M period of 5 years shall essentially be a key parameter in shortlisting of bidders. In
addition to first year energy yields, bidders shall submit long term prediction clearly indicating
the PV module initial and annual degradations.
6.1
Reference Solar Resource
The annual energy yield of a PV plant is dependent on solar resource of the site. Bidders are
required to source solar data along with wind speeds and temperature from Meteonorm 7.1.3.
The Meteonorm 7.1.3 simulated result file indicating nearest stations for interpolation, period
for which data was available and tabulated results of G_Gh (W/m2), G_Dh (W/m2), temperature
and wind speed data must be provided by the bidder in the techno-commercial offer. Owner
reserves the right to technically assess the data source independently and compare the
selection with onsite measurements if available.
6.2
Benchmarks For Energy Yield Computation
Energy yield prediction essentially depends on simulations and loss assumptions. Bidders must
use PVsyst latest version (currently 6.34) and submit PVsyst reports as the simulation tool for
energy yield predictions. Obsolete / Older version is not acceptable.
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Simulation must take into account all losses including AC losses. PVsyst simulation report shall
clearly mention details of simulation parameters, near shading definition, horizon shading
definition, main results and loss diagram. Assumption of losses largely depends on past
experience of bidders in similar locations and climatic conditions; however following loss
benchmarks may be maintained for computation.
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6.3
Shading loss can be simulated by optimizing the inter-row pitch and modeling of plant. The site
can be considered free from any near obstacles and horizon. The maximum benchmark for
shading loss shall be capped at 1.5%.
Incident angle modifier loss: This shall essentially depend on modules proposed by bidders and
technique. Accordingly the loss can be simulated.
Low Irradiance: Low irradiance loss essentially depends on the characteristics of the module and
the intensity of the incident radiation. This value shall depend on module selected and the solar
resource data used for simulation.
Soiling: The soil profile for the project site is quite rigid. Bidders are advised to evaluate the dust
profile on site and define the O&M strategy. Bidders shall justify the soiling loss assumption
along with bids.
Module quality: Module quality loss essentially depends on manufacturer’s specification.
Bidders shall provide with manufacturer’s confirmation on variation of power from nominal to
actual.
Module mismatch: Although this loss depends on EPC contractor’s capability, bidders shall
submit manufacturer’s confirmation on uniform current profiles for delivered lot of modules.
Modules within a power bin should be further classified on current-bin (Min 3 levels) as is the
practice currently.
DC cable: Electrical resistance in the cable between the modules and the input terminals of the
inverter give rise to ohmic losses (I²R). Maximum benchmark for this assumptions shall be 1%
Inverter performance: Bidders shall take Euro efficiency or Californian efficiency for energy yield
computations. Minimum benchmark for this efficiency shall be greater than 97.5%.
AC losses: AC losses shall occur is four areas, LV AC cabling, LV/MV transformers, MV AC cabling,
MV/HV transformer upto metering. Bidders are expected to provide detailed losses segregating
said areas with appropriate justifications.
Downtime Grid availability of 99.5% may be considered for energy yield computation by the
bidders.
Plant availability Bidders are expected to offer maximum plant availability; owner assumes 100%
plant availability for project economics.
Module Degradation
Bidders shall specify the initial and annual degradation thereon for 25 years. The values shall be
supported by manufacturer’s confirmation based on past experience and track record on
proposed modules.
7.0
PV Plant Performance
7.1
General
Bidders shall independently carry out performance estimation based on their solar resource
data and proposed project components. The performance estimation shall be presented in the
form of percentage performance ratio (PR). Bidders shall provide PR estimation:
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Upon commissioning of plant
For each month for first year of operation
Every quarter (3 months) for five years
Further in the document these values shall be referred to as guaranteed performance values /
levels. EPC contractors shall be legally bound for the plant performance estimation committed
during the submission of techno-commercial bids. Any such binding shall be for a minimum
period equivalent to defects liability, warranty.
7.2
Testing of PV Plant
Following the construction of solar PV plant and issuance of physical completion certificate by
the owner, following shall be the tests carried out jointly by EPC contractor and owner. It will be
EPC contractor’s responsibility for arranging all the consumables, instrumentation, material and
human resources as required for complete commissioning, start-up tests and performance ratio
comparisons.
7.2.1
Start-Up Tests
The start-up tests shall be the first step for provisional acceptance of plant. These tests shall
essentially include
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Open circuit voltage.
Short circuit current.
Validation of irradiation monitoring equipment
DC current test
Availability test
Performance ratio test
The start-up test shall be carried immediately after 7 days of physical completion of plant.
7.2.2
Performance Ratio Test
The performance ratio test shall verify whether the solar PV plant is performing at or above the
agreed value and shall be conducted as specified below. For PR measurement, IEC standard IEC
61724 will be used.
8.0
Project Warranties
The 55 MW (DC) solar PV project shall be implemented through a turnkey EPC contract including
comprehensive warranties of 5 years from the date of commissioning and commercial
operations. The project warranties shall essentially include but will not be limited to:
8.1
Defects Warranty
The EPC contract shall provide five years comprehensive warranty for the entire solar PV plant
right from PV modules to the point of interconnection and metering. The contractor shall
warrant the project free from any and all defects including unseen and latent in all project
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components and workmanship. In case of any manufacturing defect or underperformance of
any project component, the EPC contractor shall guarantee supply, installation, testing and
commissioning of defective project components at no cost to the owner.
8.2
Project Components Warranty
Project components warranty can essentially be construed as guarantees / warranties provided
by the project component manufacturers beyond the defects liability period, performance
warranty period and extended warranties. Best in Class OEM warranty to be provided for all
equipment and all such warranty for any of the project components shall be transferred to the
owner after completion of O&M period.
8.3
Performance Ratio (PR) Warranty
In addition to the PR value for project start-up performance tests, bidders are required to
submit long terms performance ratio (PR) values along with the techno-commercial bid. Plant
performance ratio during the defects liability of five years shall be one of the key criteria for
evaluation of bidders. Contractors shall be legally bound for warranting PR value for the defects
liability of five years. Guaranteed performance values provided by the contractor shall comply
with:

Meteonorm 7.1.3 software for solar resource data and PVsyst 6.34 for simulation of energy
yields, as specified in Section 6. PR values as obtained from PVsyst 6.34 shall include all AC losses
upto the point of interconnection and metering.

The first performance test shall be conducted immediately after 7 days of physical acceptance of
plant. Subsequent PR comparisons will be made from the SCADA data obtained based on real
time measurement. The schedule for comparison shall be:
·
·
·
9.0
Monthly PR values for the first year of operation.
Quarterly PR values for first five years of operation.
Annual PR values for first five years of operation.

Variation in PR shall be computed as the ratio of guaranteed PR value and on-site measured PR
value. The acceptable deviation of on-site measured PR value from the guaranteed PR value
shall be ±3%.

If the deviation in measured PR falls below 3% of guaranteed value as submitted in technocommercial bid, EPC contractor shall be liable for monetary compensation to the owner for loss
in revenue due to lower generation to fill the gap between (Guaranteed PR value x 0.97 – Actual
PR Value).

Monetary liability shall be computed considering the then energy prices of the power
purchasing company.
Solar PV Modules
Owner is essentially looking for developing a 55 MW (DC) solar PV project with CrSi/Thin Film
technology. Owner essentially would like to invite offers based on preferred list of module
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manufactures presented in Section 9.4 and the performance parameters presented in below
sections.
9.1
Quality Certification
The PV modules used in the grid connected solar power projects must qualify to the latest
edition of the all applicable IEC PV module qualification test or equivalent BIS standards.
For Crystalline Silicon Solar Cell Modules : IEC 61215 Edition II
In addition, PV modules must qualify to IEC 61730 Part I & Part II,
for safety qualification testing. For the PV modules to be used in a highly corrosive atmosphere
throughout their lifetime, they must qualify to IEC 61701.
Solar PV modules are required to be listed by Underwriters Laboratories (UL), or another
equivalent recognized Laboratory.
9.2
Guarantee Benchmarks
9.2.1
Product Guarantee
The PV modules will be guaranteed against any manufacturing defect. Defects liability shall
include but not limited to glass, frame bowing, de-lamination, water ingress, junction box
arching, hot spots, etc. The product guarantee will not be limited for modules but will also
include termination connectors, cables and all associated accessories. In the event of failure
during guarantee period, manufacturer shall replace module free of cost or refund the then
current market price of modules.
9.2.2
Nominal Power Guarantee
Bidder shall grant linear nominal power guarantees for a minimum period of 25 years. Under
these guarantees manufacturer shall ensure that module will deliver nominal power output
based on manufacturer provided annual degradation rate. The output shall be measured at
string level of max 8 kW capacity. The nominal power guarantees shall be in lieu of
manufacturing defects and workmanship; the minimum set terms shall be as below:

0 to 10 years – for a period of 10 years from the date of commissioning, if any module produces
a nominal power output below 90% as set out in manufacturer’s data sheet, EPC contractor /
manufacturer shall replace module free of cost with a new guarantee for balance period and
compensate the developer for the loss of revenue caused by the failure. Else, refund the then
current market price of modules with monetary compensation at the then energy prices of the
power purchasing company.

11 to 25 years – for a period of 15 years from the date of completing 11th year of nominal power
guarantee, if any module produces a nominal power output below 80% as set out in
manufacturer’s data sheet, EPC contractor / manufacturer shall replace module free of cost with
a new guarantee for balance period and compensate the developer for the loss of revenue
caused by the failure. Else, refund the then current market price of modules with monetary
compensation at the then energy prices of the power purchasing company.
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9.2.3
Product Life
Although the products will be guaranteed for five years and power performance will be
guaranteed for 25 years.
9.3
Technical Benchmarks
9.3.1
Nominal Power Rating
For the proposed development of 55 MW (DC) plant, the minimum acceptable module peak
power rating is 245 Wp; bidders are expected to offer respective ratings based on
manufacturer’s production availability and compliance with the client’s benchmarked track
record.
9.3.2
Nominal Power Tolerance
Only positive tolerance (max 3%) on nominal power of modules is allowed.
9.3.3
Efficiency
Minimum acceptable efficiency of all the modules under standard test conditions is 15%;
however preference may be given to modules having higher efficiency than desired.
9.3.4
Temperature Coefficients
Variation in temperature has a significant effect on electrical parameters of PV modules; Bidder
shall bid with lower temperature co-efficient for power & voltage loss
9.4
Preferred Module Makes
Owner essentially would like to go for preferred list of module manufactures presented below,
based on the performance parameters and benchmarks laid down in Section 9.
Preferred Make : Jinko, Hanwa, Hareon, JA Solar, BYD, Yingly, CSUN, Suntech, Solar-Frontier,
First Solar / other equivalent make mutually agreeable
9.5
Specific Construction Requirements
In addition to the best construction requirements of respective manufacturers, following are the
specific requirements for all the PV modules:
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All the modules shall be equipped with IP65 or higher protection level junction box
In order to minimise power loss due to partial shading on modules, all modules shall be
equipped with bypass diodes.
CrSi Modules shall be capable of withstanding a wind pressure of 2400Pa.
CrSi Modules may be subjected to high intensity hail storms, hence the modules should have
been tested for snow-load of 5400 Pa.
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Module frames shall be corrosion resistant and shall have adequate holes for mounting, water
drain and connecting ground conductor. All modules shall be appropriately grounded.
Modules to have provision for earthing of modules to avoid current leakage.
9.6
General Instructions
9.6.1
Submission
In addition to the techno commercial offer all the manufacturers shall submit following
documents.
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9.6.2
IEC Certificates
Technical literature giving complete specifications and information of modules
Handling plan of modules right through from loading at manufacturer’s factory to installation.
General Arrangement drawing of module, showing front and rear view, overall dimensions,
installation plans, termination arrangements, packing dimensions and weights.
Independent test characteristics
a) Current verses voltage at various irradiance levels.
b) Power verses voltage at various irradiance levels.
c) Open circuit voltage verses irradiance under standard test conditions.
d) Short circuit current verses irradiance under standard test conditions.
e) Power verses temperature variation
f) Open circuit voltage verses temperature variation
g) Short circuit current verses temperature variation
Upon securing the contract, EPC contractors shall also submit installation manual and flash lists
of the modules.
Identification and Traceability
RFID data to be made available from Module Supplier with at least following details:
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10.0
Model number and unique serial number for each module.
Manufacturer of solar cells and Module
Month and year of the manufacture
Country of origin
Current verses voltage at various irradiance levels
Power verses voltage at various irradiance levels.
Date and year of obtaining IEC PV module qualification certificate
Details of test lab issuing IEC certificate
Other relevant information on traceability of solar cells and modules
Central Inverters
In view of project size, operations and maintenance requirements, Owner is essentially looking
for developing its 55 MW (DC) solar PV project with central inverters. Client would like to invite
offers based on track record benchmarks and performance parameters presented in below
sections.
10.1
Quality Certification:
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Inverters shall be compliant to most recent standards (and latest amendments if any) developed
by the IEC and EN. Table below presents a non exhaustive list of standards to which inverters
should conform according to European practice.
Table : Applicable Inverters Standards
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10.2
EN 61000-6-1:2007 – For Electromagnetic compatibility (EMC). Generic standards. Immunity for
residential, commercial and light-industrial environments.
EN 61000-6-2:2005 – For Electromagnetic compatibility (EMC). Generic standards. Immunity for
industrial environments.
EN 61000-6-3:2007 – For Electromagnetic compatibility (EMC). Generic standards. Emission
standards for residential, commercial and light industrial environments.
EN 61000-6-4:2007 – For Electromagnetic compatibility (EMC). Generic standards. Emission
standards for industrial environments.
EN 55022: 2006 – For Information technology equipment. Radio disturbance characteristics.
Limits and methods of measurement.
EN 50178: 1997- For Electronic equipment for use in power installations.
IEC 61683: 1999 – For Photovoltaic systems – Power conditioners – Procedure for measuring
efficiency.
IEC 61727: 2004 – For Characteristics of the Utility Interface
IEC 62116: 2008 – For Testing procedure of Islanding Prevention Methods for Utility-Interactive
Photovoltaic Inverters
Grid Code Compliance & Power Quality Requirements
Compliance to power quality and grid codes for utility scale solar projects is essential for all
proposed systems and compliance to these is expected.
10.2.1 Summary of Specific Power Quality Requirements
Following shall be non exhaustive specific requirements:
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10.3
DC Injection into the grid : This shall be avoided by using a step-up transformer at the output of
the inverter. DC injection shall be limited to 1% of the rated current of the inverter as per IEC
61727.
The total harmonic distortion limits on AC side should be less than 3%
Data Acquisition System facility
Operational frequency: 50 + 2.5 Hz.
Operational voltage variation: + 10%
Design Basis
EPC contractors are expected to independently understand and analyse the site conditions prior
to system configuration. Bidder shall offer client with multiple options of system configurations
based on product availability and capacities subsequently it will be client’s call for selecting most
optimum system. However entire project shall have uniform capacities, makes and
configurations.
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10.4
Efficiency Benchmarks
Minimum acceptable peak efficiency shall be greater than 97.5% however preference may be
given to inverters having higher efficiency than desired. Californian efficiency though an
accepted Californian method of measuring inverter efficiency for California, may also be
significant for Indian climatic conditions. It thus should be >97.5% for proposed inverters.
10.5
Warranty Benchmarks
10.5.1 Product Warranty
Irrespective of manufacturer’s guarantee to EPC contractors the inverters will be guaranteed for
a minimum period of five years. This warrantee will not be limited only for inverters but will also
include all associated accessories, instrumentation and control.
10.6
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10.7
Experience Benchmarks
Manufacturers shall have a production track record for a minimum of 1-2 years with having
executed a single order of minimum 10 MWp across globe.
Inverters proposed by the manufacturer shall have a minimum operational track record of two
years across globe. Offers shall be supported by client testimonial for technical performance.
Specific Construction Requirements
In addition to the best construction requirements of respective manufacturers, following are the
specific requirements for all proposed central inverters:
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Transformerless inverters shall be preferred; restriction of DC components on AC side shall be
achieved by step up transformers.
Maximum power point tracker (MPPT) - Inverter configurations should be equipped with
multiple independent MPP trackers resulting in enhanced system performance. Preference may
be given for modular designs with master-slave operations.
Inverters shall be capable of operating at varying power factor and shall be able to inject or
absorb reactive power.
Inverters shall be equipped with power islanding prevention system and shall be capable of low
and high voltage ride through feature.
DC and AC Isolation switchgear – All the inverters must be equipped with standard isolation
switchgear at the input and output.
String connection box - these shall be preferred from the relevant inverter manufacturer or any
other reputed SCADA vendor along with protection and detailed string monitoring with the
central control system.
Inverters should be equipped with appropriately designed EMC filters at either ends and sine
wave filters at the AC end.
Inverters should have provision for grounding (-ve) to avoid PID.
Inverters shall be equipped with all required hardware for data collection and communication
with SCADA system. It shall have a facility of direct external communication and control to
client.
Inverters shall be equipped with appropriately sized forced ventilation system if provided with
indoor installation
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10.8
There shall be redundancy in operation with standby fans.
Inverters with outdoor duty installation shall have a minimum degree of protection of IP54. For
indoor installation degree of protection can be IP20.
Inverter shall have protection against:
o Over current
o Ground Fault Detector
o Over temperature
o Over voltage
o Reverse current
General Instructions
10.8.1 Submission
In addition to the techno commercial offer all the manufacturers shall submit following
documents for the inverters proposed.
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11.0
General Arrangement drawing showing front and rear view, overall dimensions, installation
plans, termination arrangements, packing dimensions and weights.
Technical literature giving complete specifications and information.
Installation guide
Independent test characteristics
a. Inverter efficiency verses relative power
b. Inverter efficiency versus temperature
c. Annual efficiency verses sizing factor
d. Total efficiency verses Standardized MPP power
Module Mounting Structures
Owner is essentially looking for developing its 55 MW (DC) solar PV project with CrSi/Thin Film
technology. The module mounting structure shall be fixed axis ground mounted, suitable for the
selected PV technology by the client. Bidders are required to offer prefabricated mounting
structures with no onsite fabrication work.
11.1
Codes For Mounting Structure Design
The solar PV mounting structures and allied ancillaries shall comply with the requirements of the
latest editions of Indian Standards (IS) with updated amendments. Standards and Regulations
applicable in the area where the structures are to installed shall also be followed.
Table below indicates a non exhaustive list of standards to which all the mounting structures
shall conform.
Table : Applicable Standards for Structures
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IS – 800 - 2007 – For Code of Practice for General Construction in Steel
IS – 875 -Part-III – For Code of Practice for design loads (other than Earthquake) for buildings
and structures P3- Wind Load.
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11.2
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11.3
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IS – 875 -Part-V – For Code of Practice for design loads (other than Earthquake) for buildings and
structures P5- Special Loads and Combination.
IS801 – For Code of practice for use of Cold-formed light gauge steel structural members in
construction.
IS – 808 – For Hot rolled steel beams, channels and angle sections.
IS – 1730 – For Dimensions for steel plates, sheets and strips for structural and General
Engineering Purpose.
IS – 3502 – For Steel Chequered plates
IS – 816 – For Code of practice for use of metal arc welding for general construction in mild
steel.
IS – 822 – For Code of procedure for inspection of welds.
IS – 2629 1985 - For Recommended Practice for Hot-Dip Galvanizing of Iron and Steel
IS - 4759 – Hot-Dip Zinc Coatings on Structural Steel and other allied products — Specification
General
The module mounting structure shall be fixed ground mounted designed for applicable wind and
seismic loading at the project site. Bidders shall thoroughly study the geotechnical investigation
studies conducted by client for the project site prior to design of mounting structures.
A fixed module mounting system of designed inclination shall be used for the PV plant. The
mounting structures may be indigenised with equivalent international quality standards.
Mounting structures shall use module manufacturer recommended installation accessories like
mounting clips, rails, racks etc. The design shall be approved by the module manufacturer prior
to fabrication. Any such approval shall be submitted to the client.
No on site fabrication will be permitted; all the structure members shall be factory fabricated
and only assembled on site.
Construction
The mounting structures should be tested for stability with minimum deflection and sagging.
Maximum permissible limit for sagging shall be 5mm for designed wind speed.
Minimum clearance of 500 mm shall be maintained from the ground at the lower height end of
mounting structure.
Cold form structures or hot rolled C channel structures as per Indian standards for columns and
purlin support members shall be considered
All the structure members shall be hot dipped galvanised in accordance to IS2629. Minimum
thickness of galvanisation should be 80 microns.
All mounting hardware shall be either of stainless steel or galvanised steel with adequate
protection against all climatic conditions.
Mounting structures shall be designed to facilitate easy replacement of solar PV modules.
Structure shall be designed with 20 mm distance between two modules.
Structure shall have provision to connect the earth cable joining one structure to the other.
Connecting modules and structure to same ground cable.
Structure design shall include a method of fastening the DC cables to the structure at every
50cm without causing tearing or fluttering of cables.
Adequate air gap shall be maintained between the modules and mounting structures, this
isolation shall be achieved by appropriately sized UV resistant EPDM washers.
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11.4
Maximum permissible limit for sagging shall be will be as per module manufactures guideline
and relevant IS codes
Quality Demonstration
Upon short listing on manufacturers in agreement to project commercial terms and contractor
shall demonstrate the quality of supply and workmanship on site. This will essentially include:
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Construction of civil foundations and columns: Essential quality observation shall be on the
accuracy of top levels of civil columns.
Supply and installation of module mounting structure: Essential observation on structure
alignments and ease of prefabricated structure erection.
Fixing of PV modules: Essential observation shall be accuracy of module alignment, examining
modules under stress and sagging effect along the length and width of mounting structure.
11.4.1 Conditions for Quality Demonstration
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11.5
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11.6
Manufacturers / EPC contractors are expected to submit the quality plans and installation
method statements immediately after short listing.
Quality evaluation will be carried out by an independent agency on the sample supplies and
installation.
In case of unsatisfactory supply and workmanship, method of rectification shall be proposed by
the manufacturer.
Client shall reserve the right to accept rectification plans or out rightly reject the part of full
supply and installation. Client also reserves the right to pay full or part amount following this.
Experience Benchmarks
Mounting structure manufacturers having in-house facilities for manufacturing, fabrication,
welding, etc are eligible for tendering.
Manufacturers shall have a fabrication production track record for a minimum of 10 years
Product Warranty
EPC contractors shall be legally bound to provide a performance guarantee ensuring that entire
plant will be fully functional with desired output for 120 months from the date of
commissioning. Consequently irrespective of manufacturer’s guarantee to EPC contractors the
mounting structures will be guaranteed for a minimum period of 25 years.
11.7
Submission
In addition to techno-commercial offer all the manufacturers shall submit following documents :
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Technical write-up giving complete design, specifications and information of mounting
structures, material, fabrication process, treatment performed, standards followed, types of
bolts used, etc.
General arrangement drawing of mounting structures, foundation plans, anchoring plans,
overall dimensions, installation plans, structural plans and elevation and framing details.
Standard test certificates for various structure members from independent testing laboratories.
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12.0
Hot dipped galvanisation thickness certificate from the factory.
Installation method statements and quality assurance plans
String Combiner Boxes
Owner is essentially looking for developing a 55 MW (DC) solar PV project with CrSi/Thin Film
technology. Junction boxes are required for system configuration. Junction box shall be
interpreted as string combiner box (SCB).
12.1
Quality Certification:
All the junction boxes shall be compliant to most recent standards (and latest amendments if
any) developed by the IS, IEC and EN. Regulations applicable in the area where equipment is to
be installed shall be followed.
Table below presents a non exhaustive list of standards to which junction boxes should conform.
Table : Applicable Junction Box Standards
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IEC 61730 PV component standards
IEC 60664 Creepage distances and clearances
IEC 50548 Junction boxes
UL-1741 Combiner boxes
IEC 529 Degree of protection provided by enclosures.
UL-SU 6703 Fuses
EN 60715 Chromated DIN Rail
Preference shall be given to manufacturers with maximum quality certifications for example by
TUV, CE, UL etc.
12.2
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12.3
General
String combiner boxes shall be preferred to be supplied from the inverter manufacturer
supplying inverters for this project or else from reputed SCADA vendors who have at least
executed 25 MW Solar projects.
String combiner boxes shall be equipped with appropriately sized string fuses as recommended
by PV module manufacturers. Basic string configuration / array design shall be as per data sheet
/ design recommended by the module manufacturer prior to development / implementation.
The string combiner boxes shall be equipped with monitoring hardware so as to monitor status
and performance of each string. The gateway protocol for communication shall be uniform
throughout the system.
Other than standard guarantee of 10 years, all the string combiner boxes should be offered with
extended warranties.
EPC contractors / manufacturers are required to supply required spares for 0.5% of the total
supply quantity of all string combiner boxes. This will essentially include consumables and
hardware.
Construction
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13.0
The enclosure shall be dust proof, non-conductive, impact resistant, UV resistant, flame
retardant and shall be made from fiber glass reinforced / polypropylene plastic suitable for
outdoor applications with IP65 protection rating.
The SCB shall be provided with continuous gasket made of polyurethane seamless gasket for
providing water tightness and preventing ingress of dust. The gasket shall be held in position in
groove provided in the enclosure and shall be pressed all around uniformly by suitably shaped
projection of the door.
All live parts inside the SCB shall be insulated and shall withstand a DC test voltage of 2.5 KV for
1 minute. Junction boxes shall carry a warning label indicating that all active part in the boxes
may be live.
Fuse shall be specifically designed for protecting photovoltaic strings and shall be capable of
interrupting low over currents. Fuses shall be provided on both positive and negative sides in
the SCBs.
Fuses shall be cylindrical type mounted on appropriately sized non exposed type fuse block or
fuse holders. The fuse holders / block may be DIN rail adapted.
The disconnectors shall be designed for DC 1000 V specifically used for protecting photovoltaic
systems against over currents. The disconnector shall allow the fuse replacement horizontally.
All the SCBs shall be equipped with surge protection devices.
The surge arrester shall be associated with a dedicated disconnector, the opening of which will
not turn off the downstream circuit.
The SCBs shall be suitable for mounting on the module mounting structures
All SCBs shall have an embossed aluminium plate describing string numbers, capacities, voltages
and designated identification number.
Operating temperature of the cable glands should be a minimum of 100°C. Minimum protection
level of all glands shall be IP68.
DC Cabling
The section herein describes general specifications for DC cable for solar PV applications.
13.1
Quality Certification:
Cables shall be compliant to most recent standards (and latest amendments if any) developed
by the IEC and EN for UV resistant DC cables for solar PV applications. Table below presents a
non exhaustive list of standards to which DC Cables should conform.

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
13.2
Table : Applicable DC Cable Standards
IEC 60228, class 5 Tinned fine copper strands
UL4703 Photovoltaic Wires
IEC 60332-1 Fire performance
IEC 61034 Smoke emission
IEC 60287 Conductor temperature
IEC 60216 Temperature index and service life of over 20 years
IEC 60754-1 Halogen free
IEC 60811 Resistant too chemicals and oils
Specific Design Requirements
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In addition to the best manufacturing practices of manufacturers of cables, following are the
specific requirements for all DC cables unless anywhere specified:



The cables shall be designed for a nominal DC voltage of 1.1 KV with an operating temperature
range of 2°C to 90°C
The maximum conductor temperature shall not exceed 90°C during continuous operation at full
rated current. The temperature after short circuit for 5 seconds shall not exceed 250°C with
initial conductor temperature of 90°C.
Manufacturers shall indicate the overload capacity that the cable can carry and its duration,
when operating initially at a conductor temperature of 90°C, with peak conductor temperature
of 120°C.
14.0
DC and AC Switchboards
14.1
Quality Certification:
All switchboards shall be compliant to most recent standards (and latest amendments if any)
developed by the IS, IEC and EN. Regulations applicable in the area where equipment is to be
installed shall be followed. Table below presents a non-exhaustive list of standards to which
switchboards should conform.
Table : Applicable Switchboard Standards

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
15.0
IS 13947 Low Voltage AC Switchgear and Control Gears Specifications
IS 8623 Low Voltage AC Switchgear and Control gear assemblies
IS 4237 General requirements for AC switchgear & control gear for voltage not exceeding 1000V
IS 2147 Degree of protection for enclosures for low voltage switchgear and control gear
IS 5082 Electrolytic Cu/Al
IS 14697 AC Electric Meters
IS 3043 Earthing
IS 2551 Danger Notice Plates
IS 2516 Circuit Breakers, voltages up to 1000 Volts
IS 4064 Air Break Switches, Air Break Disconnectors, for voltages not exceeding 1000V AC or
1200V DC.
IS 375 Marking & Arrangement for Switchgear, Bus Bars, main connections and auxiliary wiring
Low Voltage AC Cables
The section herein describes general specifications for low voltage grade upto 1100 V AC cables.
15.1
Quality Certification
Cables shall be compliant to most recent standards (and latest amendments if any) developed
by the Indian Standards. Table below presents a non exhaustive list of standards to which the
cables should conform.
Table : Applicable Standards for Low Voltage AC Cables

IS 7098 XLPE insulated PVC sheathed cables for working voltages upto and including 1100 volts.
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
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15.2
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
15.3

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
16.0
IS 3961 Recommended current ratings for cables
IS 8130 Conductors for insulated cables.
IS 3975 Mild steel wires, strips and tapes for armouring of cables.
Specific Design Requirements
Cables sizes shall be selected considering the power loss, current carrying capacity, voltage drop,
maximum short circuit duty and the period of short circuit to meet the anticipated currents.
Cables shall be 1.1kV grade, single / multi core, extruded XLPE insulated with extruded PVC
inner sheath
The conductor shall be electrolytic grade aluminium or high conductivity annealed copper and
shall be smooth, uniform in quality and free from scale and any defects.
The maximum conductor temperature shall not exceed 90 degree C during continuous
operation at full rated current. The temperature after short circuit for 1 second shall not exceed
250 degree C with initial conductor temperature of 90 degree C.
Cables shall be armoured with mild steel wires or strips as required for underground and in
trench installations.
Cabling
LV cables shall be laid underground, in trenches, on cable trays and through pipe sleeves
wherever required and necessary according to relevant Indian standards and good industry
practice. All such trenches, trays, sleeves shall be built and provided by contractors.
For underground installation cables shall be laid at depth not less than 0.5m below ground level.
Prior to cable laying, bottom of the trench shall be well compacted and bedded with fine sand.
Subsequently second layer of fine sand shall be spread over the cable and then covered by
compacted soil.
The cables shall be protected by placing precast half cut hume pipe over the cables on top layer
of sand and for the full length of underground cables.
Wherever more than one cable is laid in the same trench, appropriate interspacing shall be
maintained in order to reduce mutual heating and shall also ensure safety of cables.
Cables shall be laid in cement pipes encased in concrete or hume pipes at all road crossings.
After the laying and straightening of cables, it should be covered with a min 80 mm thick layer of
sand.
All the excavation and back fill required for the installation of the cables shall be carried out. The
contractor shall restore all surfaces, roadways, side walls, curbs, walls, landscaping or other
works cut for excavation to their original condition.
Underground cables and cable joints shall be marked on the surface by markers generally
manufactured and tested to the requirements of relevant Indian standards.
All cable terminations shall be mechanically and electrically sound and shall comply with
relevant standards and Indian electricity regulations
Earthing System
The entire PV plant area including all modular plot control rooms and HV substation shall be
appropriately earthed with adequate number of earth stations. Earthing system shall comply
with the latest edition of IS 3043 describing code of practice of earthing and IEEE80. The
earthing system shall have complete earthing network comprising of wires, copper tapes,
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electrodes and earth bonding of all relevant necessary non-current carrying metal parts of
equipments/ apparatus shall be connected as required.
16.1






17.0
Specific Design Requirements
Earthing network within the PV plant array yard may be of GI.
Each MV transformer shall have a minimum of four dedicated earthing stations.
Transformer body earthing can be with GI material; however wherever star point is required to
be earth strictly copper should be used.
All the earth pits shall be appropriately connected.
Dedicated earthing stations shall be provided for lightning protection system.
All the earthing stations shall be provided with test links of phosphorus bronze and located at
150mm above ground level in an easily accessible position for testing.
MV & HV Transformers
MV transformer can be referred to LV/11kV and HV transformers as 11/110kV. Owner is
essentially looking for developing its 55 MW (DC) solar PV project with multiple modular plots.
Each such plot shall step up the low voltage post inverter to 11kV by a transformer. Further
11kV shall be stepped up to 110kV by 25MVA ONAN transformers (Two nos) at the HV station.
The MV transformers shall have off-circuit tap changer for a range of -20% to +5% @ step of
1.25% to take care of the voltage degradation going to occur in the thin film solar PV modules
(Voc & Vmpp).
17.1
Quality Certification:
Transformers and allied accessories shall comply with the requirements of the latest editions of
Indian Standards and Electricity Rules with updated amendments. Standards and Regulations
applicable in the area where equipment is to be installed shall also be followed. Table below
indicates a non exhaustive list of standards to which all the transformer should conform.
Table : Applicable Transformer Standards
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17.2
IS 2026 Power Transformers
IS 3639 Fittings and Accessories for Power Transformers
IS 2099 Specification of HV Porcelain Bushing
IS 7421 Specification of LV Porcelain Bushing
IS 10028 Practice for selection, installation & maintenance of transformers
IS 335 New Insulating oils
CBIP2 Manual on Transformers
IS 3637 Buchholz Relay
IS 5561 Specification for terminal connector
IS 6600 Specification for overloading of Transformers
IS: 2147 Marshalling Box
Efficiency Benchmarks
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Efficiency of MV transformers at different loading and power factor (0.8 lag to unity) is expected
to be minimum of 98.5% whereas for HV transformer it shall be 99%. Manufacturers are
required to complete the data sheet.
17.3
Product Life
Although the products will be warranted for ten years and power performance will be
committed for 25 years, the lifetime of transformers is expected to be 30 years from
commissioning.
17.4
Experience Benchmarks
Manufacturers shall have a production track record for a minimum of 10 years with having
executed a single order of minimum 50MVA. Preference may be given to manufacturers having
a track record of supplying transformers to Solar PV Plants.
17.5
Specific Design Requirements
In addition to the best construction requirements of respective manufacturers, following are the
specific requirements:
17.5.1 General





Transformer should be provided with separate galvanically isolated low-voltage windings for
each inverter.
Transformers shall be suitable for operation with pulsed inverter.
Transformers should be rated for a maximum temperature rise of 50 Deg C by oil temperature
and 55 Deg C by winding temperature with a daily average ambient temperature of 50 Deg C.
Impulse strengths of the MV windings should be 110kV and for LV windings should be a
minimum of 3kV.
Percentage impedance expected is 5% for transformers upto 1250kVA.
Insulation levels of the transformer windings shall be rated as follows:
Table : Insulation Levels of the Transformer
Voltage
Low Voltage
11000 Volts
110000 Volts
17.6
Impulse Voltage (kV Peak)
75
550
Power Frequency
Voltage (kVrms)
3
28
240
Testing of Transformers
Prior to dispatch the transformer out of the factory, each transformer shall be routine tested. If
required, this may be in presence of Client and local electrical inspectorate.
Routine Test:
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The routine tests to be performed shall be:
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Measurement of winding resistance
Measurement of voltage ratio and check of voltage vector relationship
Measurement of impedance voltage/short circuit impedance and load-loss
Measurement of no-load loss and current
Measurement of insulation resistance
Induced over-voltage withstand test
Separate-source voltage withstand test.
Transformer noise measurement.
Type Test:
In addition to the routine tests, the following type tests may be conducted as per details in IS
2026.
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Lightning impulse-test
Temperature rise test
Short-circuit test
Air pressure and vacuum test
Unbalanced current test: the value of unbalance current shall not be more than 2% of the full
load current.
Site Test:
The transformers shall be fully tested on site prior into putting into service to ensure that all
items are in proper working condition, correctly installed and free from damage. An authorised
testing Professional Engineer shall be engaged by the contractor to perform the site testing and
commissioning. The following tests shall be made on the plant item together with any other
tests which the Sub-contractor deems necessary.
Functional Test:
Transformer tap-changers, cooling equipment, emergency stop, door interlocks, temperature
relays, their controls and all other auxiliary equipment shall be operated to prove that they are
functioning satisfactorily before the transformers are put into service. Apart from all the above
tests, the insulation of all low voltage windings and wiring shall be tested with megger test after
installation. Measurement of voltage ratio at every tap position shall also be measured.
18.0
MV (11KV) Switchgear
All the rings shall be combined together at the main control room of HV Station. There shall be
two panels with required vacuum circuit breakers that shall feed to independent 11/110kV
transformers. The section herein describes the general specifications for 11kV
18.1
Quality Certification:
The MV switchgear and allied accessories shall comply with the requirements of the latest
editions of Indian Standards and Electricity Rules with updated amendments. Standards and
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Regulations applicable in the area where equipment is to be installed shall be followed and may
supersede other standards.
Table below indicates a non exhaustive list of standards to which the 11kV switchgear should
conform.
Table : Applicable Standards for MV Switchgear
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19.0
IS 2516 Circuit Breakers.
IS 2705 Current Transformers
IS 3156 Potential Transformers
IS 3427 Metal enclosed switchgear and controlgear for voltage upto 11kV
Medium Voltage AC Cables
The section herein describes general specifications for AC cables.
19.1
Quality Certification:
Cables shall be compliant to most recent standards (and latest amendments if any) developed
by the Indian Standards. Table below presents a non exhaustive list of standards to which the
cables should conform.
Table : Applicable Cable Standards for Medium Voltage AC Cables


20.0
IS 7098 Cross-linked Polyethylene insulated, PVC sheathed cables with working voltages from
3.3 KV upto & including 33 KV.
IS3975 Mild steel wires, strips and tapes for armouring of cables.
High Voltage Station
11kV AC power from all modular plots shall be fed to a single high voltage station forming a ring
main. The high voltage station will come up at the solar plant premises will comprise of two (2)
nos. 11/110kV, 25MVA, 50Hz ONAN type step up transformers and a switchyard.
Power from the plant shall be evacuated to the 220-110KV SS Muthuramalingapuram at 110kV
level.
Complete design, supply, construction and erection of 110 KV bay extension with Breaker and
necessary protection as per TANGEDCO norms at Muthuramalingapuram 220/110KV SS with
control room extension is in the scope of the EPC Contractor.
HT control room, 110kV switchyard, 110kV transmission line and 110kV bay extension shall be
designed, developed and implemented in accordance to TANGEDCO requirements. Bidders shall
liaise with TANGEDCO and get the preconstruction and design approvals.
20.1
110 kV Overhead Line
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
110 kV Overhead transmission line of apprx 8-10 KM shall be laid by Bidder between each
Solar power plant to 220-110KV Sub Station at Muthuramalingapuram. The installation of
Transmission line shall be carried out as per the following latest standards/documents.
As per design and construction of 110 kV S/C lattice structure Overhead transmission line with
Zebra conductor followed by TANGEDCO
CBIP standards on Overhead lines.
CEIG and Other Regulations.
Relevant Indian Standards
The Bidder should acquaint themselves with IE rules, 1956 as amended form time to time and
with the latest Indian Telegraph Act, and the entire installation shall comply.
20.2
Quality Certification
The 110kV switchyard and allied accessories shall comply with the requirements of the latest
editions of Indian Standards and Electricity Rules with updated amendments. Standards and
Regulations applicable in the area where equipments are to be installed shall also be followed.
Table below indicates a non exhaustive list of standards to which all the Switchyard Equipments
should conform.
Table : Applicable Standards for Switchyard Equipments
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20.3
IS 9921 Part I to V – AC disconnectors and earthing switches
IS 996 Single phase small AC and universal electric motors.
IS 7572 Guide for testing single phase AC and universal motors.
IS 4237 General Requirement for switchgear for voltage not exceeding 1.1 kV.
IS 2147 Degree of protection provided by enclosure for low-voltage switchgear control gear.
IS 2544 Porcelain post insulator
CBIP Central Board of Irrigation and Power
IS 2629 Practice for Hot-Dip Galvanizing of Iron and Steel
IS 6639 Hexagon Bolts for Steel Structures
IS 2309 Lightning
NFPA 70 Fire protection of transformers and transformer vaults
NFPA 15 Water spray fixed systems
IS 10028 Selection, installation and maintenance of transformers
Design Basis
The design basis mentioned herein shall be followed by the bidders.
Climatic Conditions:
Bidders may follow below climatic conditions for their project component selection and system
designs, however bidders are expected to visit the site and independently assess these
conditions prior to their offerings.


Ambient temperature: upto 48°C.
Storage temperature: upto 48°C.
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
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Humidity: upto 98RH%
Basic wind speed: 39 m/s.
Seismic Condition: Zone II
Basic Technical Parameters:
The basic technical parameters mentioned shall be strictly followed
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Nominal voltage (kV): 110 kV
Rated voltage (kV) : 121 kV
Rated frequency (Hz): 50 +/- 5%
System neutral earthing: Solidly Grounded
Basic Insulation Level
a. Impulse frequency withstand voltage: 550kVp
b. Power frequency withstand voltage: 240kVrms
Outdoor Switchyard Equipments (110kV)

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21.0

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
Minimum Creepage: 25 mm/kV under normal condition
Minimum Creepage: 31 mm/kV under polluted condition
Minimum clearances: Phase to Phase 1100 mm & Phase to Earth 1100 mm.
Safety Clearances: 4000 mm
Height of lowest live point on the insulator from the ground: 4600 mm
Bus Configuration: Single Bus.
Battery Chargers and Batteries
Basic construction features of the battery charger shall be similar to the control and relay panel
as specified in above section.
The DC system configuration shall be with 2 times 100% float cum boost charger with two
independent battery banks.
The batteries shall be VRLA type conforming IS 1652. Batteries shall be free from orientation
constraints, eco friendly, and ready to use.
Minimum specification of batteries shall be
o
o

Rating: 110V D.C., with 2 times 100% AH requirement.
Terminal posts: Designed to accommodate external bolted connections suitably.
The battery charger unit shall have following specifications,
o Type: Constant Potential type with current limiting facility.
o Normal charging voltage shall not exceed 2.25 volts per cell.
o MCB of suitable rating shall be provided as incomer to charger. The rating shall be
suitable for battery short circuit current.
o D.C. output voltage during float charging shall be stabilized within 1% of the set value of
D.C. bus voltage for variation in input A. C. voltage of 10% and frequency of 5%
o D.C. Load variation: 0 to 100%
o The ripple contents: <3% of the nominal D.C. rated voltage.
o Load Limiting feature of charger shall be designed for short time overload to take care
of intermittent loads coming on D.C. bus.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
o
o
22.0
The boost charging voltage shall be adjustable between 70% to 100% of maximum value
of 2.45 volts per cell. Boost charge current shall have provision for adjustment between
30% to 100% of its maximum value.
Battery charger panel shall be provided with one potential free contact for collective
trouble in battery charger system. This contact shall be wired up to terminal block for
interfacing with Master Control Panel.
Energy Meters
Availability based tariff metering through check and main energy meters shall be installed within
the solar PV plant premises. Meters shall have an accuracy class of 0.2S and shall be
microprocessor based conforming to IEC-687. Utility main and check energy meters shall be
provided by bidder;
In addition to utility metes, dedicated energy meters shall be provided on 110kV side for HV
transformers.
23.0
Bid Evaluation
The Bid Evaluation will be based on the Net Cash Flow i.e. the Sum of Total Cash Inflow
minus Total Cash Outflow. The Generation (in Kwh) for each of the five (5) years
would be provided by the bidder supported by Meteonorm 7.1.3 reports. The
revenue will be derived by multiplying the generation provided with the fixed tariff
as per PPA for the first five (5) years i.e. Rs. 7.01/-. Further the Present Value (PV) of
the revenue from the Sale of Power will be computed based on annual discount rate
of 14.40% for 5 years.
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Financial Evaluation Sheet
(not to be filled by the Bidders)
Financial Evaluation Sheet
Year
Cash Outflow : Total EPC
Contract Price including T/L
(in Rs Cr)
Generation (in Kwh) at the
metering end
Revenue from sale of power
at Rs 7.01 per Kwh with no
escalation (Rs)
Total Operation &
Maintenance Cost (in Rs Cr)
Net Revenue from Sale of
Power (in Rs Cr)
Discounting Factors
PV of Revenue from Sale of
Power (in Rs Cr)
Cash Inflow : NPV of Revenue
from Sale of Power (in Rs Cr)
Net Cash Flow (in Rs Cr)
N
0
A
1
2
3
4
5
-
-
-
-
-
B
C =B x 7.01
D
E = C-D
F = [1/(1+r)^(n-1)]
1.00
0.87
0.76 0.67 0.58 0.51
G = E*F
H=
G1+G2+G3+G4+G5
I=H–A
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
24.0
Approved Vendor for Solar PV and BoS
SN
Components
Preferred Make
Jinko / Hanwha / Hareon / JA Solar / BYD / Yingli /
CSUN / SUNTECH / Solar-Frontier / First Solar /
Other equivalent make mutually agreeable
SMA / Bonfiglioli / GE / ABB / Xantrex - Schneider /
Hitachi / TMEC / TBEA / Other equivalent make
mutually agreeable
SMA/ABB/ Bonfiglioli / Schneider /SKYTRON / Other
equivalent make mutually agreeable
SMA/ABB/ Bonfiglioli - Vectron / Schneider
/SKYTRON / Other equivalent make mutually
agreeable
Amercable / Betaflam / Polycab / Lapp /Ravin
/Bhansali / Thermo / Other equivalent make
mutually agreeable
Cooper Bussmann / Littelfuse / Mersen / Siba /
Other equivalent make mutually agreeable
ABB / Citel / DEHNguard / Erico /Ferraz Shawmu/
Other equivalent make mutually agreeable t
ABB / Schneider / Crompton / Kirloskar /
Voltamp / Sudhir / Other equivalent make mutually
agreeable
ABB / Schneider / Siemens / Other equivalent
make mutually agreeable
KEI / Polycab / Ravin / Universal / Other
equivalent make mutually agreeable
Birla-3M / M Seal / Raychem / Other equivalent
make mutually agreeable
Birla-3M / M Seal / Raychem / Other equivalent
make mutually agreeable
ABB / Schneider / Reco / Siemens / GE / Other
equivalent make mutually agreeable
Automatic Electric / Indcoil / Kappa / Pragati /
Precise / Other equivalent make mutually agreeable
ABB / Conzerv / Secure / Other equivalent
make mutually agreeable
1
Solar PV Modules
2
Central Inverters
3
String Combiner Boxes
4
Monitoring System
5
Cables
6
DC Fuses
7
Surge Protection
Devices
8
Transformers
9
MV Switchgear
10
MV Cables
11
MV End Termination
Kit
12
MV End Joining Kit
13
Protection Relays
14
Current Transformers
15
Trivector Meters
16
Electronic Digital
Meters
(A/V/pf/Hz/kWh)
ABB / Conzerv / Secure / Other equivalent
make mutually agreeable
17
Battery Charger
Amaraja / Caldyne / Emerson / Masstech /
Other equivalent make mutually agreeable
18
Lead Acid Batteries
Exide/ HBL / Hoppecke / Other equivalent
make mutually agreeable
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
19
LV Cables
KEI / Nicco / Polycab / Universal / Other
equivalent make mutually agreeable
20
Sandwich type Bus
trunking
C & S / L&T / Schneider / Siemens / Other
equivalent make mutually agreeable
21
Cable Glands
Comet /Cosmos / Other equivalent make
mutually agreeable
22
Bimetallic Cable lugs
23
Distribution Boards
24
LV Switchgear
25
LED Indicating Lamps
26
Load Managers with
RS 485 port
Comet / Cosmos / Dowells / Other equivalent
make mutually agreeable
Hager (L&T) / Havells / Legrand / Schneider /
Siemens / Other equivalent make mutually
agreeable
ABB / Schneider / Siemens / Other equivalent
make mutually agreeable
Altos / GE Power Control / Schneider /
Siemens / Tecnik / Other equivalent make mutually
agreeable
ABB /Automatic Electric / Conzerv / L&T /
Other equivalent make mutually agreeable
27
PVC Insulated Copper
wires FRLS
Finolex / Polycab / Anchor / Ravin / Other
equivalent make mutually agreeable
28
Cable trays
Asian Ancillaries / Elcon / profab Engineers /
Other equivalent make mutually agreeable
Project components required for HV substation / 1 1 0 kV switchyard shall be in
compliance with TANGEDCO requirements. Bidders shall separately present a list of
makes considered for 110kV switchyard.
25.0
Predicted performance of Plant
Bidder shall provide the predicted results as per the following sheet
A. Guaranteed Performance Ratio (Bidders to provide PVsyst Reports)
Performance Ratio for Year 1 of Operation
Month 1
Month 2
Month 3
Month 4
Month 5
Month 6
Month 7
Month 8
Month 9
Month 10
Month 11
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Month 12
Average (1 year Average)
Performance Ratio for Year 2 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Average
Performance Ratio for Year 3 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Average
Performance Ratio for Year 4 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Average
Performance Ratio for Year 5 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Average
B. Energy yield
After down time & degradation
considered from 1st month
operation
First year energy yield, Gwh
First year specific yield, kWh/kWp/Year
First year specific yield, kWh/KW/Year
C. System loss factors, %
Inter row Shading Loss
IAM loss
Low irradiance
Module temperature
Soiling
Module quality
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Module mismatch
DC Ohmic
Inverter performance
Downtime
MPP Tracking
First Year Degradation
AC Losses
AC Ohmic
Transformer (LV/MV)
Transformer (MV/HV)
Total Annual Loss Factor
D. Generation (in KwH) at Metering End (use Meteonorm 7.1.3 for Solar Resource Forecasting
and submit reports)
Year
Generation
in kWH
26.0
1
2
3
4
5
APPENDIX 1: PROJECT CHARACTERSTICS
Bidders are expected to completely fill in the following tables and submit along with the offer
Modular Plot Details
Sr. No.
1
Plot summary
Modules per string
Modules per plant
Strings per inverter
Inverters per plant
Peak power per plot
2
3
Unit
Nos.
Nos.
Nos.
Nos.
kWp
Inverter DC Input Details
Number of String Combiner Boxes (SCB)
SCB Power Capacity
Open Circuit Voltage of DC input
Nos.
kWp
V
Mounting structure summary
Modules per mounting structure
Mounting Structures per inverter
Mounting Structure length per plot
Mounting Structure length per plant
Mounting structures per plot
Mounting structures per plant
Nos.
Nos.
m
m
Nos.
Nos.
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
Values
39
201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Project Characteristics
Sr. No.
1
Sources used for following Data
Solar Resource
Climate
Temperature
Precipitation
Wind
2
i
ii
Module
General
Manufacturer and Model
Maximum Power (Pmp)
Rated Power Tolerance
Module efficiency
Module Area
Fill factor
Electrical
Maximum Power Voltage (Vmp) @ STC
Maximum Power Current (Imp) @ STC
iii
iv
4
Open Circuit Voltage (Voc) @ STC
Short Circuit Current (Isc) @ STC
Thermal
Temperature Coefficient of Isc
Temperature Coefficient of Voc
Temperature Coefficient of Pmax
Normal Operating Cell Temperature
(NOCT)
Commercial
Power Warranty
For 5 years
Extendable to 10 years
Standard degradation per year
Unit
deg C
m/s
Wdc
%
%
m2
%
V
A
V
A
%/ºC
%/ºC
%/ºC
ºC
String Details
Number of Modules in a String
String Power Capacity
Open Circuit Voltage of String (Voc)
Short Circuit Current of String (Isc)
KWp
V
A
SCB Details
Number of Strings
Nos.
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
Values
40
201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Project Characteristics
Sr. No.
String Combiner Box (SCB) Power
Capacity
Open Circuit Voltage of SCB (Voc)
Short Circuit Current of SCB (Isc)
5
i
ii
iii
iv
6
Inverter
Input Data
Inverter Manufacturer and Model
Nominal DC Power
Maximum DC Power
MPP Voltage Range
Maximum DC Voltage
Maximum DC Current
Number of DC inputs
Threshold voltage
Output Data
Continuous AC power at 50°C
Nominal AC Voltage with tolerance
Efficiencies
Maximum Efficiency
European Efficiency
CEC Weighted Efficiency
Unit
Values
kWp
V
A
kWdc
kWdc
Vdc
Adc
Nos.
Vdc
kWac
Vac
%
%
%
Installation (Outdoor / Indoor)
String Array Summary
Modules per String
Strings per combiner box
Strings per Inverter
Nominal Power Ratio
Inverter Maximum Power (Pmax) at STC
Maximum power voltage (Vmpp) at STC
Maximum power current (Impp) at STC
Open-circuit voltage (Voc) at STC
Short-circuit current (Isc) at STC
Minimum mpp voltage (Vmpp) at 70ºC
Maximum mpp voltage (Vmpp) at 5ºC
Maximum open circuit voltage (Voc) at 5ºC
Maximum open circuit voltage (Voc) at 0ºC
Maximum operating power
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
Nos.
Nos.
Nos.
kWp
V
A
V
A
V
V
V
V
kWp
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Project Characteristics
Sr. No.
Temperature at Maximum operating power
Irradiance at Maximum operating power
Short circuit current (Isc) at Maximum power
Unit
Values
ºC
W/m2
A
7
8
9
Mounting Structure
Manufacturer and Model of Mounting
Tilt
Azimuth
Pitch
Ground Coverage Ratio
Area per MW
Table Design
Modules per table
Number of rows
Module assembly- Horizontal/ Landscape
Table Length
Table Height
Total Mounting Structure per plant
System Loss Factors
Low irradiance
Module temperature
Soiling
Module quality
Module mismatch
DC Ohmic
Inverter performance
Downtime
MPP Tracking
First Year Degradation
AC Losses
AC Ohmic
Transformer (LV/MV)
Transformer (MV/HV)
Total Annual Loss Factor
Annual degradation
Energy Yield
First Year Energy Yield
First Year AC Specific Yield (kWh/kWp)
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
º
º
m
%
Sq.m
Nos.
m
m
Nos.
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
GWh
42
201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Project Characteristics
Sr. No.
Performance Ratio for Year 1 of Operation
Month – 1
Month – 2
Month – 3
Month – 4
Month – 5
Month – 6
Month – 7
Month – 8
Month – 9
Month – 10
Month – 11
Month – 12
Unit
Values
Performance Ratio for Year 2 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Performance Ratio for Year 3 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Performance Ratio for Year 4 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
Performance Ratio for Year 5 of Operation
Quarter – 1
Quarter – 2
Quarter – 3
Quarter – 4
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
27.0
APPENDIX 2: DATA SHEETS
Bidders are expected to completely fill in the following data sheets and submit along with
offer
27.1
Solar PV Modules
Bidders may offer a maximum of three different models of polycrystalline /Thin Film
modules depending on availability and manufacturing capacities.
Technical Parameters of PV Modules
Type 1
Type 2
Type 3
Modules
Peak Power Watts (Wp)
Power Output Tolerance (%)
Cell Type & No. of Cells
No. Bypass Diodes
Fill Factor
Under standard operating conditions at Irradiance 1000W/m2 and temperature 25°C
Encapsulated Cell Efficiency (%)
Module Efficiency (%)
Maximum Power Voltage (V)
Maximum Power Current (A)
Open Circuit Voltage (V)
Short Circuit Current (A)
Nominal operating conditions at Irradiance 800W/m2 and ambient temperature 40°C
Maximum Power (W)
Maximum Power Voltage (V)
Maximum Power Current (I)
Open Circuit Voltage (V)
Short Circuit Current (A)
Temperature ratings
Nominal Operating Cell Temperature
Temperature Coefficient of P MPP
Temperature Coefficient of VOC
Temperature Coefficient of ISC
Efficiency reduction (From 1000 W/sq m to 200W/sq m)
Nominal Power Output
0 – 1 years (W)
2 – 5 years (W)
6 – 12 years (W)
13 – 22 years (W)
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters of PV Modules
Type 1
Type 2
Type 3
23 – 25 years (W)
25 – 30 years (W)
27.2
String Combiner Box
Technical Parameters of String Combiner Box
Maximum permissible DC voltage
Maximum permissible DC current
Number of measuring channels
Maximum string current per measuring
channel
Dimensions (H x W x D) in mm
Weight (kg)
Protection Rating
Operating temperature range
Relative humidity
Communication
27.3
Central Inverter
Technical Parameters of Central Inverters
Model
Transformer / Transformer less
No load loss
Input (DC)
Rated DC power
Max. DC power
Max. DC voltage
MPP voltage range
DC nominal voltage
Min. DC voltage/start voltage
Max. input current/string
Output (AC)
AC nominal power
Nominal AC voltage
Nominal AC current
AC frequency range
Max Power factor (cos )
Max THD
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters of Central Inverters
Efficiency
Max. efficiency
Euro-eta
CEC efficiency
Power Consumption
Internal consumption in operation
Internal night consumption
External auxiliary supply voltage
Others
Operating temperature range
Degree of Protection
Operating temp range
Noise emission
Overall dimensions
27.4
LV/MV Transformers
Technical Parameters of LV/MV Transformers
KVA rating
Rated voltage:
HV Winding
LV Winding
Rated Frequency
Number of phases
Vector Group
HV Winding
LV Winding
Vector Symbol
Type of construction
Type of cooling
Tap changing equipment
Type
No. of steps
% of voltage at each step
Tap Range %
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters of LV/MV Transformers
Temperature above ambient of 50°C
Oil
Winding
50°C
55°C
Losses at rated voltage on principal tap and rated frequency
No load loss
Copper loss at full load at 75ºC
Withstand time for three phase short circuit at terminals (sec.)
No load current at rated voltage and rated frequency.
Insulation level
Separate source power frequency voltage withstand for more than one minute
HV Winding
LV Winding
28kV
3kV
Full wave lighting impulse stand voltage
HV Winding
LV Winding
Designed magnetic flux density
% Impedance (±10% tolerance as per IS)
Regulation at full load at 75ºC
At unity power factor
At 0.9 power factor lag
At 0.8 power factor lag
Over fluxing withstand time (sec)
120 percent
150 percent
170 percent
Efficiency
Efficiency at unity power factor
Full Load
75% Load
50% Load
25% Load
10% Load
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters of LV/MV Transformers
Efficiency at 0.9 power factor
Full Load
75% Load
50% Load
25% Load
10% Load
Efficiency at 0.8 power factor
Full Load
75% Load
50% Load
25% Load
10% Load
Approximate dimensions
Tank/enclosure L x b x h
Overall L x b x h
Approximate weight of transformers
Core
Winding HV
Winding LV
Insulation
Enclosure and fittings
Total weight
Windings
Type of windings
Current Density at rated load
HV Winding
LV Winding
Clearances
Phase to Phase in air
Phase to Earth in air
Creepage distance
Termination
Primary Side
Secondary Side
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
27.5
MV/HV Transformers
Technical Parameters of MV/HV Transformers
KVA rating
Rated voltage:
HV Winding
LV Winding
Rated Frequency
Number of phases
25MVA (2 nos)
110kV
11kV
50 Hz. + 3%
3 Phase
Vector Group
HV Winding
LV Winding
Star
Star
Vector Symbol
YNyn 0
Type of construction
Oil Type, Outdoor
Installation
Type of cooling
Oil Natural Air Natural
Tap changing equipment
Type
No. of steps
% of voltage at each step
Tap Range %
On load type
16
1.25% each
+ 10 % to -10 %.
Temperature above ambient of 50° C
Oil
Winding
50° C
55° C
Losses at rated voltage on principal tap and rated frequency.
No load loss
Copper loss at full load at 75ºC
Withstand time for three phase short circuit at terminals (sec.)
No load current at rated voltage and rated frequency.
Insulation level (Windings)
H.V. (kVp/kVrms)
L.V. & LVN (kVp/kVrms)
550/240
75/28
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters of MV/HV Transformers
H.V. Neutral (kVp/kVrms)
Separate source power frequency voltage withstand for more than one
minute
HV Winding
LV Winding
240kV
70 kV
Full wave lighting impulse stand voltage
HV Winding
LV Winding
Designed magnetic flux density
% Impedance (±10% tolerance as per IS)
Regulation at full load at 75ºC
At unity power factor
At 0.9 power factor lag
At 0.8 power factor lag
Over fluxing withstand time (sec)
120 percent
150 percent
170 percent
Efficiency
Efficiency at unity power factor
Full Load
75% Load
50% Load
25% Load
10% Load
Efficiency at 0.9 power factor
Full Load
75% Load
50% Load
25% Load
10% Load
Efficiency at 0.8 power factor
Full Load
75% Load
50% Load
25% Load
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters of MV/HV Transformers
10% Load
Approximate dimensions
Tank/enclosure L x b x h
Overall L x b x h
Approximate weight of transformers
Core
Winding HV
Winding LV
Insulation
Enclosure and fittings
Total weight
Windings
Type of windings
Current Density at rated load
HV Winding
LV Winding
Clearances
Phase to Phase in air
Phase to Earth in air
Creepage distance
Termination
Primary Side
Secondary Side
27.6
11KV Switchgear Panels
Technical Parameters For 11kV Switchgear Panel
MV Panel
Number of breakers
Enclosure
System short circuit MVA
Breaking Current - Symmetrical
Breaking Current - Asymmetrical
Circuit Breaker
Type
Incoming Breaker
Outgoing Breaker
IP40
IP40
VCB - motorised
VCB – motorized
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters For 11kV Switchgear Panel
Standard
Rated Current
SC withstand current (KA)
Duration (Sec) for above
Type of Closing
Tripping
ON-OFF flags
ON-OFF indicating
Cable size
Pad lock with key
Truck
Incoming Breaker
IS 14658
Outgoing Breaker
IS 14658
Motorised & Manual
Motorised & Manual
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
Meters
Trivector Meter
Voltmeter
Type
Class of Accuracy
Size
Selector Switch
Digital
1.0S
96 x 96 mm
O-RY-YB-BR
Digital
1.0S
96 x 96 mm
O-RY-YB-BR
Ammeter
Type
Class of Accuracy
Size
Selector Switch
Digital
1.0S
96 x 96 mm
O-R-Y-B
Digital
1.0S
96 x 96 mm
O-R-Y-B
Potential Transformers
No. of P.T’s
Burden
Transformation ratio
Accuracy class
Current Transformers
Number
Burden
Transformation ratio
Accuracy class
Power factor Meter
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters For 11kV Switchgear Panel
Type
Class of Accuracy
Incoming Breaker
Digital
1.0S
Outgoing Breaker
Digital
1.0S
Digital
1.0S
Digital
1.0S
2-OC & 1-EF
Solid state,
selectable, IDMT,
2-OC & 1-EF
Solid state,
selectable, IDMT,
Frequency Meter
Type
Class of Accuracy
Relays
Over Current & Earth Fault
Type
Setting range – O/C
Setting range – E/F
Auxiliary relays
27.7
Alarm & Trip
Alarm & Trip
145KV CIRCUIT BREAKER & ISOLATOR
Technical Parameters For 145kV Circuit Breaker and Isolator
145kV SF6 Circuit Breaker
Make & Type
Rating
Breaking Capacity (kA)
Short Circuit Withstand Capacity
Opening time
Closing time
Weight
Insulation level
Impulse withstand voltage
Control Voltage
Minimum Creepage
Dimensions
Noise level at 50 m distance at 150 m distance
Isolator
Rated voltage
Rated current
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Technical Parameters For 145kV Circuit Breaker and Isolator
Insulation level
Short time current rating
Control Voltage
Minimum Creepage
Dimensions
Weight
Operating Mechanism
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
28.0
APPENDIX 3: PROJECT SCHEDULE
Project Schedule
The following table shall be used in consonance with the requirements set forth in Section 2.
Bidder/Consortium may, if available, use project scheduling software (MS Project) to accomplish
this table.
Summarized Project Execution Plan for 50MW
From Zero date / NTP
date
Days
S No
Start
date
Finish
Date
Activity
1.0
Preliminary Activities
1.1
Site Survey
1.2
Project Conceptual Design & Contouring
1.3
Review & Approval of Conceptual Design by Owner
1.4
Project Final Design
1.5
Soil and Water Testing & obtaining reports
1.6
Leveling of Land
1.7
Preparation of SPV Power Plant Layout and Drawings
1.8
Submission of Drawings to TANGEDCO and Approval - By Owner
1.9
Approvals from Local Panchayat, Municipality, Pollution Board, EIA, etc
2.0
Procurement/Manufacture of Plant's Equipment & Components
2.1
PV Modules
2.2
Inverters
2.3
Mounting Structures
2.4
Junction Boxes
2.5
Wires & Cables
2.6
Transformer
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Summarized Project Execution Plan for 50MW
From Zero date / NTP
date
Days
S No
Start
date
Finish
Date
Activity
2.7
Switch Yard
2.8
Control Instruments and Panels
2.9
Witness Testing of Solar PV Modules
3.0
Civil Works
3.1
Land Development
3.2
Making Foundation Blocks
3.3
Temporary Storage Sheds
3.4
Control Room Building
3.5
Internal Roads and Path ways
3.6
Storm Water Drainage system
3.7
Trenching/ Ground-insertions for Electrical Cables
4.0
Module Mounting Structures
4.1
Procurement
4.2
Receiving at Site
4.3
Erection at site
5.0
PV Yard Area
5.1
PV Modules Receiving at Site
5.2
Assembly & Mounting of Modules on Structures
5.3
Module Inter Connections
5.4
Cables Reach Site
5.5
Cabling Work in PV Array Yard
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Summarized Project Execution Plan for 50MW
From Zero date / NTP
date
Days
S No
Start
date
Finish
Date
Activity
5.6
Procurement of Inverters and Monitoring devices
5.7
Receiving of inverters at site
5.8
Installation of Inverters
6.0
Power Evacuation System
6.1
Design of Transformers & Switch Gears
6.2
Procurement of Transformers & Switch Gears
6.3
Receiving Transformers & Switch Gears at site
6.4
Installation of Transformer & Switch Gears at Site
6.5
Earthing System for Power Evacuation and SPV
7.0
Hooking of Sub-Systems
7.1
Terminations in JBs & inverters in PV Array Yard
7.2
Terminations in Inverter Synchronization Panels
7.3
Terminations in LT of Transformers and Switch Gears
7.4
Terminations on the HT side of Utility Grid
8.0
Testing of Sub-Systems
8.1
Testing of individual PV Sub-Arrays
8.2
Testing of the Earthing System
8.3
Testing of the inverters
8.4
Charging of the Transformers & Testing
8.5
Testing of Switch Gears & Protection Relays
9.0
Hooking up with Utility Grid
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
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201504/HPSPV/Tamil Nadu, RFP for 55 MW (DC) Grid Connected Solar PV Power Project
Summarized Project Execution Plan for 50MW
From Zero date / NTP
date
Days
S No
Start
date
Finish
Date
Activity
9.1
Charging of the Utility Grid
9.2
Synchronization with the Grid
9.3
Testing of the complete system and Data recording
9.4
Commissioning the complete system & Handing over
-----------------------X-----------------
HINDUSTAN CLEANENERGY LIMITED, NEW DELHI, INDIA
58
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