medium voltage switchgear - SGC

medium voltage switchgear - SGC
DI-2
MEDIUM VOLTAGE SWITCHGEAR
THE MODULAR AND COMPACT CONCEPT
User manual
M EDIUM VOLTAGE SWITCHGEAR, BUILT TO LAST
SGC nv - SwitchGear Company - Moorstraat 24 - B-9850 Nevele
Tel: +32 (0)9/321.91.12 - Fax: +32 (0)9/321.91.13 - e-mail: [email protected] - www.switchgearcompany.be
© 2013 SGC nv - SwitchGear Company.
All rights reserved.
The information provided herein may not be reproduced and/or (re)published in any way and by any means (electronic or
mechanical), without the prior, explicit written authorization of SGC nv - SwitchGear Company.
The information provided herein is based on general data concerning the construction, known at the time of publication,
and concerning the qualities of the material and working methods. Consequently, the right to make changes is reserved.
The information contained within is applicable to the standard version of the DI-2 medium-voltage switchgear. Therefore,
SGC nv - SwitchGear Company cannot be held liable for any damage resulting from specifications that differ from the
standard version of the DI-2 medium-voltage switchgear.
The available information has been assembled with the greatest possible care, but SGC nv - SwitchGear Company
cannot be held liable for any mistakes in the information, or the consequences thereof.
The user names, trade names, trademarks, etc., used by SGC nv - SwitchGear Company cannot, in accordance with
the legislation concerning the protection of trademarks, considered to be free.
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Attention ........................................................................................................ iv
1 GENERAL CHARACTERISTICS ........................................................... 1-1
1.1 Standard conditions of service........................................................................................ 1-2
1.2 Functional unit composition ............................................................................................ 1-3
1.2.1 Metallic envelope ......................................................................................................... 1-3
1.2.2 SF6 TANK .................................................................................................................... 1-3
1.2.3 Compartment of operation and control ........................................................................ 1-4
1.2.4 Compartments of cables .............................................................................................. 1-5
1.2.5 Gas expansion section ................................................................................................ 1-5
1.2.6 Fuse holders ................................................................................................................ 1-6
1.2.7 Light signal of fuses state ............................................................................................ 1-6
1.3 Sheet of characteristics .................................................................................................. 1-6
1.4 Indicator of voltage presence.......................................................................................... 1-7
1.5 Busbar ............................................................................................................................ 1-8
1.6 Interlocking and blocks ................................................................................................... 1-8
1.6.1 Interlocking .................................................................................................................. 1-8
1.6.2 Block by means of padlock ........................................................................................ 1-10
1.7 Electrical Characteristics .............................................................................................. 1-10
2 TRANSPORT AND OPERATION ........................................................... 2-1
3 STORAGE ............................................................................................... 3-1
4 INSTALLATION ...................................................................................... 4-1
4.1 General tips .................................................................................................................... 4-1
4.2 Fixing .............................................................................................................................. 4-1
4.3 Junction of panels ........................................................................................................... 4-2
4.4 End of panels .................................................................................................................. 4-6
4.5 Grounded equipment ...................................................................................................... 4-6
4.6 Connection of cables ...................................................................................................... 4-7
4.6.1 Installation steps .......................................................................................................... 4-7
4.7 Fuses .............................................................................................................................. 4-8
4.7.1 Fuse selection.............................................................................................................. 4-8
4.7.2 Fuse substitution........................................................................................................ 4-10
4.8 Phases consistency ...................................................................................................... 4-11
5 OPERATING SECUENCY ...................................................................... 5-1
5.1 Line function ................................................................................................................... 5-1
5.2 Protection function .......................................................................................................... 5-3
5.3 Circuit breaker function with protection relay .................................................................. 5-5
6 TEST OF CABLES ................................................................................. 6-1
7 LOCATION OF THE CURRENT COLLECTOR ..................................... 7-1
8 SECURITY .............................................................................................. 8-1
8.1 Security elements ........................................................................................................... 8-1
8.2 User security cautions .................................................................................................... 8-1
9 MAINTENANCE ...................................................................................... 9-1
10 SPARE PARTS .................................................................................... 10-1
11 ENVIRONMENTAL INFORMATION .................................................... 11-1
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iii
ATTENTION
Medium voltage equipment, during its operation, can probably have voltage
elements, motion parts and parts with high temperature. Because of this,
operation of this type of equipments could have electrical, mechanical and
thermal risks.
The lack of training is one of the main causes of industrial accidents. Therefore,
only qualified and trained personnel according with the norm IEC-EN 50110 “
Electrical installation operation, following the Labour Risks Prevention Law and
corresponding local rules will be able to work in the equipment described in this
manual.
All our products are designed with a compromise of quality and security for
people and equipments. Therefore, DI-2 panels have been tested
against internal arc according with the standard IEC 62271-200 in order to
guarantee the user´s security of these panels. Our materials quality
requirements as well as the manufacturing process control and the final product
control guarantee the high quality level of DI-2 panels.
SGC nv – SwitchGear Company reserves the right to introduce any appropriate
modification to improve the equipment or the manufacture system without
warning.
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Notes:
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v
1
GENERAL CHARACTERISTICS
The equipment for medium voltage electrical energy distribution, that we
present in this catalogue, are composed by cells manufactured under a metallic
housing isolated in sulphur hexafluoride, SF6.
The DI-2 system is composed of modular and compact systems of 24 and 36 kV.
Panels and its main components are manufactured in agreement with the
following international standards certifications:
IEC 62271-200 “High-voltage switchgear and controlgear – Part 200: AC metalenclosed
switchgear and controlgear for rated voltages above 1 kV and up to
and including 52 kV.”
IEC 60255 “Measuring relays and protection equipment.”
IEC 60265 “High-voltage switches.”
IEC 62271-1 “High-voltage switchgear and controlgear - Part 1: Common
specifications.”
IEC 62271-100 “High-voltage switchgear and controlgear - Part 100: Alternating
current circuit-breakers.”
IEC 62271-102 “High-voltage switchgear and controlgear - Part 102: Alternating
current disconnectors and earthing switches.”
IEC 62271-105 “High-voltage switchgear and controlgear - Part 105: Alternating
current switch-fuse combinations.”
The quality requirements on the materials used in our products, as well as the
manufacturing process control and the professional employees skill, they
guarantee the high quality level of DI-2 cells given to our customers.
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1-1
The DI-2 system is composed of the following functional units:
GENERAL
DESCRIPTION
DI-2 A
PANELS OR FUNCTIONS
Incoming cubicle or cable field with load
break switch
DI-2-P
Transformer protection cubicle provided
with load break switch with fuse
combination
DI-2 D
Protection cubicle with vacuum circuit
breaker with integrated protection relay
1.1
UNIFILAR
Standard conditions of service
The DI-2 panels, considered as indoor installations, fulfill with the following standard
conditions of service:
Installation
Ambient Temperature (Maximum value)
Ambient Temperature (Minimum value)
Solar Radiation
Average Ambient Temperature measured for 24 hours.
Maximum Altitude
Air Pollution.
Average Relative Humidity measured for 24 hours.
Average Vapor Pressure of Water measured for 24 hours.
Average Relative Humidity measured for one month.
Average Vapor Pressure of Water measured for one month.
Vibrations
1-2
Indoor
40 ºC
-10 ºC
Negligible.
35 ºC
2000 m.
No significant.
<95%
<2,2kPa
<90%
<1,8kPa
No significant.
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*For special working conditions, please contact with the Technical-Commercial
Department of SGC nv - SwitchGear Company.
1.2
Functional unit composition
The panel is composed of the following elements:
1.2.1
Metallic envelope
The metallic housing is composed of a two millimeters thick white metallic sheet
AP02 according with the standard IEC-EN 10130 and are subjected to a complete
process where they are degreased, stained, phosphated, passivated and given an
additional rinse with demineralised water. They are automatically sprayed with polyester
powder in a powder spray cabin, after which they are heated in an oven at 200°C. The
complete cubicle structure has been constructed out of high-quality galvanized plates, it is
resistant to corrosion and has a long life span.
The panel has one frontal door. The cover, united to the chasis with
screws, allows to access to the control and operation area. The door allows to access to
cable, fuse and current transformers area when it will be necessary.
1.2.2
SF6 TANK
The tank is an enclosure compartment which has the control and operation
elements and whose isolating environment is sulphur hexafluoride (SF6). Steel
sheets AISI 304 with welded reinforcements of the same material to guarantee
the mechanical characteristics demanded by the constructive system, will be
employed to manufacture it.
In the upper cover is located the manometer which establishes the working
limits of the device (Red, Green).
Manometer scale is divided in two areas:
Green Area, working safe area.
Red Area, under this circumstance we must immediately inform SGC nv - SwitchGear
Company and do not operate the cell.
MAIN DISCONNECTOR SWITCH.
The disconnector switch with opened-closed positions is a sliding system. This
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1-3
switch during the opening operation injects directly SF6 gas, which is located
inside the tank, over the area where the electric arc is produced.
The operation over the switch is carried out with an operating axis which is
located in the upper side of the control. The pole motion speed is always the
same and independent of the manual operation action speed of the operator.
EARTH DISCONNECTOR SWITCH.
The earth disconnector switch is a rotating system with two positions:
disconnected and earthed. In the earth position, the corresponding entrance
cables are to earth and therefore, directly short circuited.
In line function, grounding is simple while in protection function grounding is
double and simultaneous, carrying out earth connection before and after fuses.
The closure of this disconnector is abrupt providing the disconnector with the
closure power over the short circuit. In this case, poles motion speed is always
the same and independent of the action speed manual operation as well as in
the main switch disconnector, while the opening is depending of the operator
action speed.
VACUUM CIRCUIT BREAKERS.
This vacuum circuit breaker is composed of vacuum valves for closure and
opening even in conditions of lack or short circuit. In addition, an associate
disconnector is included in order to isolate and separate the valves and the
general bars.
The switch operating is carried out mechanically, charging springs and with
closure or opening buttons.
The associate disconnector operating depends on the action of the operator.
1.2.3
Compartment of operation and control
In this compartment, opening or closure operations of main switch, earth
disconnector and vacuum circuit breaker are carried out using buttons. For each
case, synoptic unifilar diagram can be found in the frontal side.
In this diagram, there are position indicators of the operating elements which
are totally integrated in the synoptic.
1-4
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1.2.4
Compartments of cables
The cable compartment is located in the front inferior side of the panel. In this
compartment are located bushings, general earth bars, clamps for power
cables, fuses bases and depending of the model, current transformers.
1.2.5
Gas expansion section
The panels have a security valve for gas evacuation. There is a gas expansion
section which is designed in order to eject (back and up) the gas generated in
an internal arc, avoiding its effect on people, cables or equipment.
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1-5
1.2.6
Fuse holders
Each fuse protection function includes three fuse holders with its corresponding
base covers. This set is able to work in flooding conditions because of being
completely sealed by its joints.
The fuse holders are located in the gas tank. The fuse holders hold 36 kV fuses in
agreement with the standard IEC-EN 60282-1.
1.2.7
Light signal of fuses state
Each fuse protection function includes a signal panel which show fuses state.
When the indicator signal is green, all fuses are operatives. On the other hand when
the indicator signal is red, one or more fuses are melted.
1.3
Sheet of characteristics
In the upper door of the panel is located the sheet of characteristic in which all
the data about the product according with the international standard IEC 62271200 is provided.
1-6
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TYPE: Product name.
SERIAL NUMBER: Serial Number of the Panel
YEAR OF MANUFACTURE: Panel Year of Manufacture.
Ur: Rated Voltage. [kV]
Up: Lightning Impulse Withstand Rated Voltage. [kV]
Ud: Rated Withstand Voltage at Power Frequency. [kV]
Ir: Rated Current in Constant Service. [A]
Ik/It Short-Time Withstand Current. [kA]
Ip: Rated Peak Withstand Current (main and earthed circuits). [kA]
fr: Rated Frequency. [Hz]
WEIGHT OF SF6: Isolating fluid and weight. [kg]
RATED PREASURE FOR FILLED GAS TANK: Gas Pressure in the tank [bar]
INTERNATIONAL STANDARD CERTIFICATION: The current certification for
the product is IEC 62271-200
1.4
Indicator of voltage presence
In the MV cables bushings, two capacitive connectors which are connected to
the voltage presence equipment are provided. This device that indicates the
presence of voltage shows three signals corresponding with each of the
phases, indicating the presence of voltage in each of them with flashes.
This unit is in the upper door, located over each one of the functions that
include the panel. It is possible to extract it in order to be able to check in a
properly manner without removing none part of the panel.
Plugging bases of the aforementioned unit are fixed to the upper door. Special
care is required to remove this door. It is necessary to extract the connections
from the capacitive insulators, which are located in the cables area, until the
upper door.
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1-7
1.5
Busbar
MAIN CIRCUIT BUSBAR
The main circuit busbars are composed of ETP solid bars or C-110 plates
according with standards IEC-EN 12164 and IEC-EN 13601 respectively.
EARTH CIRCUIT BUSBAR
The earth circuit busbar located outside the SF6 tank is composed of ETP solid
copper according with IEC-EN 13601.
1.6
Interlocking and blocks
1.6.1
Interlocking
The main switch disconnector, automatic breaker and ground disconnector are
interlocking between them.
All the functions include interlocking between the operating axis. Its function is
to avoid that the operating bar may enter in one or another axis, because the
position of main switch disconnector, automatic breaker or ground disconnector
have a vertical or horizontal runners which may or not move to positions that
cover or uncover the corresponding operating axis.
1-8
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The interlocking carried out by each function are the following:
LINE FUNCTION:
Standard conditions of service:
1. It is not possible to open the entrance door of the cables with the ground
disconnector opened.
2. It is possible to open the ground disconnector with the door of the cables opened
3. It is not possible to close the main switch with the ground disconnector closed.
4. It is not posible to close the ground disconnector with the main switch closed.
Cables testing:
1. It is not possible to open the ground disconnector without operating the cables
testing device.
2. It is not possible to release the testing cables device or close the entrance door of
the cables with the ground disconnector opened.
3. It is not possible to operate the main switch with the testing device of the cables
operating.
PROTECTION FUNCTION
1. It is not possible to open the door(s) or fuse(s) with the ground disconnector
opened.
2. It is not possible to open the ground disconnector with the door(s) of the cables o
fuses opened.
3. It is not possible to close the main switch with the ground disconnector closed.
4. It is not possible to close the ground disconnector with the main switch closed.
PROTECTION FUNCTION WITH AUTOMATIC BREAKER
1. It is not possible to open the entrance door of the cables with the ground
disconnector opened.
2. It is possible to open the ground disconnector with the door of the cables opened.
3. It is not possible to close the automatic breaker with the ground disconnector
closed.
4. It is not possible to close the ground disconnector with the automatic breaker
closed.
5. It is not possible to operate (open or close) the disconnector if the automatic
breaker associated is closed.
6. It is not possible to close the disconnector if the ground disconnector associated is
closed.
7. It is not possible to close the ground disconnector if the disconnector associated is
closed.
CROSSING DISCONNECTOR FUNCTION
This function is not provided of interlocking.
MEASUREMENT FUNCTION
This function is not provided of interlocking.
STEP UP FUNCTION
This function is not provided of interlocking.
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1-9
1.6.2
Block by means of padlock
Each position can be blocked by padlocks of 8mm maximum diameter.
Padlocking is possible on the switch disconnector and circuitbreaker and ground
disconnector.
The door can be padlocked as well with 8mm maximum diameter padlock.
The entrance to the axis of the switch and disconnector associated and to the
automatic breaker can be blocked by means of padlock.
1.7
Electrical Characteristics
RV36 SWITCH DISCONNECTOR
TYPE
E3
Standard certification of the panel
IEC 62271-200
Standard certification of the switch
IEC 60265-1
Indoor
Instalation Type
Phase Number
3
Collecting Bars Number
Simple bar
Rated Voltage
36 kV
1,2/50 μs Lightning Impulse Withstand Rated Voltage
To earth and between phases
170 kV-peak
At the isolating distance
195 kV-peak
Rated withstand voltage at power frequency 50 Hz 1 min
To earth and between phases
70 kV
At the isolating distance
80 kV
1-10
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Frequency
Rated Current of Fuses Protected Output
Rated Current
Rated Short-Time Withstand Current
Peak Value of Short-Time Withstand Current
Short Circuit Duration
Breaking Capacity
Mainly active current
Cable-charging current
Earth fault current
Cable-charging under earth faults.
Line-charging current
Close loop current
Mechanical hardness type
Degree of protection against solid foreign objects
Degree of protection against mechanical impacts
SF6 Tank degree of protection
Equipment type under metallic envelope
GROUND DISCONNECTOR-FUSES INPUT
Standard certification
Rated voltage
1,2/50 μs Lightning impulse withstand rated voltage
Rated withstand voltage at power frequency 50 Hz 1 min
Frequency
Short-time rated current
Peak values of short-time withstand current
Short circuit duration
Short circuit closing capacity
GROUND DISCONNECTOR-FUSES OUTPUT
Short circuit closing capacity
Short-time rated current
Short circuit duration
AUTOMATIC VACUUM BREAKER
Type
Kind
Standard certification of the panel.
Standard certification of the automatic breaker.
Installation type
Phase number
Collecting bar number
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50-60 Hz
200 A
400 / 630 A
16/20 kA
40 / 50 kApeak
1s
400 / 630 A
31,5 A
50 A
25 A
25 A
40 / 50 kApeak
M1 / M2
IP2X
IK08
IP67
Block
IEC 62271-102
36 kV
125 kV-peak
70 kV
50-60 Hz
16 / 20 kA
40 / 50 kApeak
1s
40 / 50 kApeak
2,5 kA-peak
1 kA
1s
WL-36093P
C2
IEC 62271-200
IEC 62271-100
Indoor
3
Simple bar
1-11
Rated voltage.
1,2/50 μs Lightning impulse withstand rated voltage.
To earth and between phases.
At the isolating distance
Rated withstand voltage at power frequency 50 Hz 1 min.
To earth and between phases.
At the isolating distance
Frequency
Recovery Transitional Voltage
TTR Nominal slope
Closing time
Arc duration
Approximate total time of opening
Rated current
Short-time rated current.
Peak values of short-time withstand current
Short circuit duration
Nominal current of circuit breaker
Short circuit closing capacity
Mechanical hardness
Degree of protection against solid foreign objects
Degree of protection against mechanical impacts
SF6 Tank degree of protection
Equipment type under metallic envelope
GROUND DISCONNECTOR
Standard certification
Rated voltage
1,2/50 μs Lightning impulse withstand rated voltage
Rated withstand voltage at power frequency 50 Hz 1 min
Frequency
Short-time rated current
Peak values of short-time withstand current
Short circuit duration
Short circuit closing capacity
1-12
36 kV
170 kV-peak
195 kV-peak
70 kV
80 kV
50-60 Hz
66 kV
0,57 kV/μs
65 ms
<17ms
70 ms
630 A
20 kA
50 kA-peak
1s
20 kA
50 kA-peak
10.000
IP2X
IK08
IP67
Reinforced
IEC 62271-102
36 kV
170 kV-peak
70 kV
50-60 Hz.
20 kA
50 kA-peak
1s
50 kA-peak
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2
TRANSPORT AND OPERATION
The DI-2 panels are delivered totally plastic-wrapped and fixed in a
pallet. Do not remove the packing is advised until it will be located in its final
position.
Panels have to be in vertical position, on a pallet or on the floor.
A forklift truck must be used for its operation. The panel will be always located
in front of the driver in order to avoid potential damages in the front. Slings or
rocker arms are also valid. These are fixed to the elevator pieces, which are
located in upper area of the panels, in order to pull in a vertical direction with an
angle of 55 ° for slings and of 80 ° for rocker arms.
In case of forklift truck transport, it should be considered that gravity center is
quite high and therefore it is easy to turn over
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2-1
3
STORAGE
Conditions for storage are the following:
Vertical position.
Not to pile up.
Rain protection.
Direct solar radiation protection.
Range of temperature for storage: -25 ºC y 55 ºC.
After time of storage and before installation, DI-2 panels must be
carefully cleaned in particular all the insulating parts.
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3-1
4
4.1
INSTALLATION
General tips
To transport the panel from the storage to the installation place with its original
packaging is recommended.
The place of installation must have similar conditions than the storage place, in
other words, the panel must be protected against rain and direct solar radiation.
Temperature in the installation place must not be lower than – 10 °C and higher
than 55 °C.
The DI-2 panels are supplied with a plastic wrap protection. SGC nv - SwitchGear
Company recommends a visual inspection in order to check if the panel has suffered
damages in the transport. In case of verifying any type of damage, before
installation, please contact with SGC nv - SwitchGear Company’s technical department.
From the point of view of people security, the distance to the walls or lateral
panels must be of a minimum of 50 mm and to the back walls of 100 mm.
The thickness of the service corridors must be wide enough to allow an easy
operation and inspection of the installations as well as free motion and transport
of devices in the installation and maintenance operations.
This thickness will not be lower than the following:
Operation corridors with voltage elements in one side. 1000 mm.
Operation corridors with voltage elements in both sides. 1200mm.
Inspection corridors with voltage elements in one side. 800 mm.
Inspection corridors with voltage elements in both sides. 1000mm.
The aforementioned values must be totally open, in other words, measured
between the projecting elements such as controls, rails, etc.
NOTE. The distance between the panel ceiling and the installation place ceiling
will be of a minimum of 300 mm in the traditional transformer substations. In the
compact type with outside operation, this high can be of 40 mm.
4.2
Fixing
The panel must be fixed directly on the floor or different sections, therefore 4
holes of 13 mm diameter are located in its inferior part. In order to access to
these positions, is required to remove the inferior doors.
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4-1
4.3
Junction of panels
Union between extensible DI-2 panels in order to connect them
electrically and mechanically is made by SGC nv - SwitchGear Company double
connectors. This system allows the panels connection without entering in the gas
compartment.
The system is composed of three connectors which are located in the bushings
and sealed the joint, monitoring the electric field.
In order to carry out the proper junction between the extensible panels of the
DI-2 system or the proper installation of the insulated cover for internal
cone bushings protection, the following tools must be available:
• 2 Key 12-13.
• 1 13 mm Dynamometric key and 10 mm small opening.
• 1 Acetone bottle.
• 1 Clean and dry cloth.
1. Locate the first panel in the corresponding position in the transformer substation.
2. Clean the internal cone bushings in both panels and the coupling connector with a
clean and dry cloth.
3. Lubricate with the silicone grease that is supplied with the connector, the junction
surface of the bushings and connectors.
4. Insert nylon wires (in order to evacuate air between bushing and connector) at the
same time that the connectors.
5. Screw on the earth wire of the connectors with a hexagonal bolt M8x20 ISO 4017
and two washers M8 according with DIN 125.
4-2
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6. Fix the neoprene joint all around the panel.
7. Remove bolts of the earth general line.
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4-3
8. Move the second panel according with the figure below and remove the nylon wires.
9. Join the panels in B positions as showed in the figure below using hexagonal bolts
M8x60 ISO 4017, two plain washers M8 according with DIN 125 and two nuts M8
ISO 4032.
10. Join the panels in A positions as showed in the figure below, using three hexagonal
bolts M8x25 ISO 4017, three plain washers M8 DIN 125 and three nuts M8 ISO
4032.
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11. Join the panels in C position as showed in the figure below using an hexagonal bolt
M8x25 ISO 4017 and a plain washer M8 ISO 4032.
12. Join the general earth lines of the panels.
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4-5
4.4
End of panels
The extensible panels prepared for a future extensibility of the transformer
substation must include insulated covers to protect the internal cone bushings.
The proper installation of such insulated covers must be carried out according
with the following instructions:
1. Clean carefully the bushing internal faces.
2. Lubricate with the silicone grease that is supplied in the kit, the insulate silicone
body and in the bushing internal faces.
3. Insert the insulate silicon body of the cover in the bushing with the clamp in order to
remove the air.
4. Remove the clamp when the cover is located at the bottom of the bushing.
5. Fix the sheet screwing three bolts.
4.5
Grounded equipment
When the cell is fixed on its final location, it must be earthed by connection of
the side plates to the general earth line of the transformer substation.
4-6
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Note.- It is an essential condition of security for the equipment to be earthed.
4.6
Connection of cables
Service line of medium voltage, outputs to transformers and other panels are
carried out by cables.
Junction operations of the connectors to the cables will be carried out by
qualified personnel who are duly trained and follow the instructions of the
connector manufacturer in detail.
In the DI-2 system of panels, cables for line function and automatic
protection must use 630 A connectors.
For protection functions, cables must be manufactured with plug-in connectors
of 250 A.
4.6.1
Installation steps
In order to connect the cables, follow the instructions taking into account that
shield is not a protection against direct contacts. It is totally forbidden to handle
the connectors with voltage although these were shielded.
When there is a system with voltage and in the upper busbar a reserve panel
with voltage and without cables in the inferior bushings is left; insulated covers
for the bushings or connection of the ground disconnector blocking this position
with a lock or padlock is required.
Sequence of steps:
1. Connect the ground disconnector.
2. Remove the door of the cables.
3. Remove the bushing protection, clean with a dry cloth and lubricate all the contact
surface of the cable with silicone grease supplied with the connector.
4. Connect the terminals on the frontal bushings.
5. Fix the first clamp.
6. Lean the cable on the clamp, move and tighten the next clamp against the cable
and block it in this position.
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4-7
7. Repeat this action with the rest of the cables.
8. Connect the earth wires of the cables and the terminals to the general earth line of
the panel.
9. Put the door in its position.
4.7
Fuses
A fuse inserted in an electric circuit is devoted to protect this circuit and its
associated elements permanently. The manner in which the fuse will work, not
only depend of the manufactured precision but also of its proper manufacture.
The fuse cartridge will be storaged in its original packaging up its use. Before its
operation, it must be checked that all fuse cartridge do not have a fall or knock
which could break some of its internal conductors.
4.7.1
Fuse selection
To select an appropriate fuse of rated voltage 24 or 36 kV, the following
considerations are taken into account:
All the fuses implemented in the DI-2 panels must be manufactured in
agreement with IEC 60282-1 and with the following dimensions:
kV
24
36
4-8
L
442
537
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Fuse rated current is generally higher than normal current of service, therefore,
rated current will be chosen in agreement with the rated power and voltage of
the transformer according with the following table:
Fuses losses should not be greater than 50 W, when working at the current
corresponding with maximal charge of the transformer. Without this information,
when working in the air, should be at 50 % of its rated current.
Inaccurate selection of the fuse rated current may deteriorate fuses, contacts or
metallic housings of the panel.
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4.7.2
Fuse substitution
Substitution tasks can be carried out with the equipment connected or not. The
cables door of the protection function should be opened. This forces the main
switch disconnector to be opened. The grounded disconnector which earthed
both terminals of the fuse should be closed. This implies that the upper busbar
would have current.
It is recommended to replace the three fuses of the three-phase circuit though
fuses of one or two phases were still working unless, it is certainty known that
no over current were circulating through the no fused fuses.
Sequence of steps:
1. Remove the door of the cables in order to access to the fuse holders. The main
switch should be opened.
2. Close the grounded disconnector.
3. Open the cables door.
4. Lift the handle of the fuse holders and pull in order to remove it.
5. Remove the rail of the fuse holder.
6. Remove the fused fuse, avoiding to rest the fuse holder on a surface that could get
dirty the holder or the contact.
7. Insert the rail fuse holder sliding.
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8. Reset the fuse holder striker up to block it in this position.
9. Place the fuse holder sliding up to the holder limit and put down the handle
checking that it is blocked in this position.
10. Close the door of the cables.
11. Start the panel.
4.8
Phases consistency
Once the medium voltage panels are fixed and connected in the transformer
substation, its correct connection has to be verified, checking the consistency of
the phases.
It is possible to measure the consistency of the phases with a multimeter of
input impedance higher than 20MΩ (20 KΩ/V scale of 1000V)
Considering that the measurement range will be the following:
Between a phase and neutral of the same base ~110 Vac.
Between different base phases < 50 Vac.
Between different phases >130 Vac.
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5
OPERATING SECUENCY
Note: Before operating, it must be checked that manometer pressure is located in the
green area, according with the panel pressure, showed in the sheet of characteristics.
When the voltage indicators are switched off, it must be checked that are working
correctly.
5.1
Line function
6 MANOMETER
1 NAMEPLATE
8 SYNOPTIC
9 MAIN SWITCH OPEN-CLOSE
SIGNAL
7 VOLTAGE DETECTION
SYSTEM
10 MAIN SWITCH OPERATING
AXIS
12 MAIN EARTH DISCONNECTOR
OPEN-CLOSE SIGNAL
13 EARTH SWITCH DISCONNECTOR
OPEN-CLOSE SIGNAL
5 CABLES DOOR
14 CONTROL LEVER
NOTE. - Be a blockage that impedes operating on the disconnector switch with the cables
door (5) open and / or earth switch closed.
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5-1
DISCONNECTOR SWITCH CLOSE
1. Close the access cover to cables (5).
2. Open the earth swith disconnector.
3. Check the opening in the earth switch disconnector gauge (13).
4. Put the control lever (14) in the control embrasure (10) and turn clockwise to close
the disconnector switch.
5. Check the close in the main switch open-close signal (9).
SWITCH DISCONNECTOR OPEN
1. Put the control lever (14) in the control embrasure (10) and turn counterclockwise to
open the switch disconnector.
2. Check the opening in the main control swith open-close signal (9).
CHECK VOLTAGE ABSENCE.
1. To check the voltage absence the voltage indicators must be off (7).
EARTH SWITCH DISCONNECTOR CLOSE
1. Open the switch disconnector.
2. Check voltage absence.
3. Put the control lever (14) in the control embrasure (12) and turn clockwise to close
the disconnector switch.
4. Check the close in the main switch open-close signal (13).
EARTH SWITCH DISCONNECTOR OPEN
1. Put the control lever (14) in the control embrasure (12) and turn counterclockwise to
open the earth switch disconnector.
2. Check the open in the earth switch disconnector open-close signal (13).
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5.2
Protection function
1 MANOMETER
3 NAMEPLATES
2 SYNOPTIC
10 MAIN SWITCH OPEN-CLOSE
SIGNAL
9 VOLTAGE
DETECTION SYSTEM
11 MAIN SWITCH OPERATING
AXIS
6 MELTED FUSE
SIGNAL
13 MAIN EARTH DISCONNECTOR
OPERATING AXIS
14 EARTH SWITCH DISCONNECTOR
OPEN-CLOSE SIGNAL
8 FUSE AND
CABLES DOOR
7 PUSH BOTTOM FOR QUICK
OPENING OF THE PROTECTION
SWITCH
16 CONTROL LEVER
NOTE.-Be a blockage that impede operating on the disconnector switch with the cables
and fuses door (8) open and / or earth switch closed.
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5-3
DISCONNECTOR SWITCH CLOSE
1. Close the access cover to cables and fuses (8.
2. Open the earth swith disconnector.
3. Check the opening in the earth switch disconnector gauge (14).
4. Put the control lever (16) in the control embrasure (11) and turn counterclockwise to
resetting the equipment.
5. Put the control lever (16) in the control embrasure (11) and turn clockwise to close
the disconnector switch.
6. Check the close in the main switch open-close signal (10).
SWITCH DISCONNECTOR OPEN
1. Put the control lever (16) in the control embrasure (11) and turn counterclockwise to
open the switch disconnector or operating the push bottom for the quick opening of
the protection switch (7).
2. Check the opening in the main control swith open-close signal (10).
CHECK VOLTAGE ABSENCE.
1. To check the voltage absence the voltage indicators must be off (9).
EARTH SWITCH DISCONNECTOR CLOSE
1. Open the switch disconnector.
2. Check voltage absence.
3. Put the control lever (16) in the control embasure (13) and turn clockwise to close
the disconnector switch.
4. Check the close in the main switch open-close signal.
EARTH SWITCH DISCONNECTOR OPEN
1. Release the control embrasure of earth switch disconnector (13) with the vertical
blockage (12) and closing the cables door (8).
2. Put the control lever (16) in the control embrasure (13) and turn counterclockwise to
open the earth switch disconnector.
3. Check the open in the earth switch disconnector open-close signal (14).
FUSES ACCESS
1. Open the switch disconnector.
2. Check the voltage absence.
3. Close the earth swith disconnector.
4. Open the fuse and cables door (8) moving the horizontal blockade device (15).
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5.3
Circuit breaker function with protection relay
1 MANOMETER
13 NAMEPLATE
3 ASSOCIATE SWITCH
DISCONNECTOR MAIN
AXIS
4 OPEN BOTTOM
10 SYNOPTIC
11 ASSOCIATE SWITCH
SIGNAL
12 SPRING CHARGE AXIS
5 MECHANICAL
COUNTING
14 MAIN EARTH DISCONNECTOR
OPERATING AXIS
6 CLOSED BOTTOM
8 SPRING
INDICATING
2 VOLTAGE DETECTION
SYSTEM
15 EARTH SWITCH DISCONNECTOR
OPEN-CLOSE SIGNAL
17 MAIN SWITCH OPEN-CLOSE
SIGNAL
18 CABLES DOOR
19 HANDLE FOR MANUAL
CHARGE OF SPRING FOR
CIRCUIT BREAKER
Nota.- Be a blockage thats impedes operating on the earth switch disconnector
with the disconnector switch or associate switch disconnector closed or cables
door open.
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5-5
DISCONNECTOR SWITCH CLOSE.
1. Close the access cover to cables and release the control embrasure of earth switch
disconnector.
2. Open the earth switch disconnector.
3. Check the opening in the earth switch disconnector signal.
4. Release the control embrasure of associate switch disconnector witch the vertical
blockage.
5. Put the control lever in the control in the control embrasure and turn clockwise to
reseting the equipment.
6. Check the close in the associate switch disconnector signal.
7. If It’s necessary charge the completly the springs putting the spring lever in it control
embrasure and turn counterclockwise completly.
8. To close the automatic breaker push the closed bottom.
9. Check the close in the asóciate switch signal.
SWITCH DISCONNECTOR OPEN.
1. Pus the open bottom to open the switch disconnector.
2. Check the opening in the switch disconnector signal.
3. Release the control switch embrasure of associate switch signal.
4. Put the control lever in the control in the control embrasure and turn
counterclockwise to open the switch disconnector.
5. Check the opening in the associate switch signal.
CHECK VOLTAGE ABSENCE.
1. To check the voltage absence the voltage indicators must be off.
EARTH SWITCH DISCONNECTOR CLOSE
1. Open the switch disconnector and the associate switch disconnector.
2. Check voltage absence.
3. Release the control embrasure of earth switch disconnector with the vertical
blockage.
4. Put the control lever in the control embrasure and turn clockwise to close the
disconnector switch.
5. Check the close in the main switch open-close signal.
EARTH SWITCH DISCONNECTOR OPEN
1. Release the control embrasure of earth switch disconnector with the vertical
blockage and closing the cables door.
2. Put the control lever in the control embrasure and turn counterclockwise to open the
earth switch disconnector.
3. Check the open in the earth switch disconnector open-close signal.
5-6
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6
TEST OF CABLES
The line functions in the modular and compact system include a mechanism
which allows to carry out the test of the cables.
SEQUENCE OF OPERATIONS:
1. Open the switch.
2. Close the ground disconnector.
3. Open the acces cover to the cables.
4. Open the ground disconnector.
5. Carry out the test of cables.
6. Close the ground disconnector
7. Move the horizontal interlocking slide in order to release the mechanism of cable
test.
8. Open the ground disconnector.
9. Close the switch.
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7
LOCATION OF THE CURRENT COLLECTOR
In the remote control panels, the current collector for phases is located in the
cables door of each line function, as well as the divided core current collector
for homopolar
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8
SECURITY
High voltage switchgear is only considered safe when it has been installed in
agreement with the required installation rules and used and maintained
according with the instructions of this guide.
8.1
Security elements
The installation place must fulfill with the security requirements in agreement
with the legislation currently in force, having the following security elements:
- Isolating foot stool.
- Medium voltage insulated gloves.
- Safety helmet.
- Protective shield.
- Fire extinguisher of 89B minimun efficiency.
- Warning signs of danger.
- Emergency phone numbers.
- Poster with the five golden rules for working without voltage:
o Insulate the whole assembly from the active parts.
o Ensure the assembly against possible accidental connections.
- Check that the assembly is with no-voltage.
- All possible voltage sources affecting the work area must be in earth and shortcircuit position.
- Delimit working areas by placing the right safety signs.
8.2
User security cautions
The user should:
- Restrict the access to the installation for trained and authorized people.
- Train regularly operators and rest of the personnel in relation with risks and security
requirements, including the local rules.
- Keep the equipment in right conditions and updated in relation with technical rules,
especially interlocking and protection devices.
- Select equipment which minimizes risks derivate of personnel inaccurate operation
(for instance, grounded disconnector in lines, motorized operating axis for allowing
remote control).
- Coordinate the protection system with properties of the product (for instance, do not
carry out resets with internal faults).
- Make earthed procedures considering the reference difficulty and the understanding
of complex regulations and the switchgear operation.
- Equip clearly the equipment for an easy identification of the individual devices and
gas compartments.
- Especially for maintenance, reparation or extension:
o Assure that the maintenance works, reparation and extension will be carried
out only for trained personnel.
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8-1
o Provide a security and protection plan. Indicate the responsible of planning,
implement and fulfill the security and protection rules.
o Before starting, check the interlocks and the protection devices.
o Pay special attention to the manual operations, especially when the
switchgear has voltage.
o Inform before operating to the personnel who may stay close to the
switchgear (for instance with a siren or light signal).
o Signpost emergency exits and keep areas free of obstacles.
o Train the personnel in how to work in safe way in the switchgear and what to
do in an emergency situation.
8-2
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9
MAINTENANCE
Maintenance of this type of installations must be carried out by qualified
personnel according with the law in force in order to install and operate voltage
equipments.
The DI-2 panel systems have a lifespan higher than 30 years, as long
as the installation will be made according with this manual. In addition accurate
fuses and cables must be used and connectors must be perfectly made and
installed.
The electrical and mechanical tests carried out in high quality national and
international laboratories guarantee the accurate operation of the disconnector
elements.
It is recommended to carry out the following actions.
Once a year and without disconnecting the panel, it will be checked:
SF6 gas pressure.
Manometer pointer located in the green area.
If the pointer is located in the red area, please contact with SGC nv – SwitchGear
Company’s technical-commercial department and do not operate the panel.
If the pointer is close to the red area, the service will be normal but a new inspection must
be made in a maximum of three months. However, it should be reported to SGC nv –
SwitchGear Company’s technical-commercial department who will give the appropriate
instructions.
Operation of voltage indicators.
To check the operation of voltage indicators, panel signals must be disconnected of its
base and to supply with testing terminals with a minimum voltage of 30 Vca between
phase and neutral and each one of the phases. It should be checked that each one of the
three signals are flashing. It can be connected either of phase and neutral because there
is no polarity.
In case of one or more light signs do not shine; this unit must be replaced for an
original one.
The voltage indicator can be replaced if needed. In this case, screws which are
fixing the upper door and others located at left and right side of the indicator
must be removed.
Subsequently, switch the indicator back connector off without disconnecting the
line voltage.
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9-1
10 SPARE PARTS
SGC nv - SwitchGear Company original spare parts are required if some replacement is
needed. Fuses replacement must be made with SGC nv - SwitchGear Company fuses,
following the instructions given in this manual. Any kind of replacement or change must be
made by SGC nv - SwitchGear Company authorized personnel. SGC nv - SwitchGear
Company suggests having, in the installation place of the DI-2 panels, the following spare
parts: three fuses and an operating axis.
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10-1
11 ENVIRONMENTAL INFORMATION
The DI-2 panel systems are metal enclosed manufactured with SF6. Sulphur hexafluoride
(SF6) is a gas with excellent dielectric properties which allow rapid electric arc extinction
and therefore it has been widely used in medium voltage switch and panels
SF6 is a greenhouse gas effect whose Atmospheric Warming Potential (AWP) is of 22.200
units. Therefore, its releasing must be controlled and reduced according with the laws in
force in each country and requirements of the Kyoto Protocol. Until now, there is no gas
which can replace the SF6 despite of research efforts carried out. In consequence, there is
a global responsibility of rational and responsible use of this product. Therefore, SF6 must
be recovery for recycling and treatment at the end of product useful life, avoiding its
releasing to the atmosphere. This extraction must be carried out by qualified personnel.
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Notes:
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THE SPECIALIST IN MEDIUM VOLTAGE SWITCHGEAR
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©2013 SGC nv - SwitchGear Company
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