Medium-Voltage distribution

Medium-Voltage distribution
Medium-Voltage distribution - 24 kV
Metal-enclosed withdrawable
switchgears
• MCset4 - SF6 technology
• NEX24 - vacuum technology
PE90002
2008 Maintenance and Services Guide
October 2008
A brief summary of the
24 kV
range
This Maintenance and Services Guide applies
to 24 kV Medium-Voltage distribution:
metal-enclosed withdrawable switchgears.
PE90026
MCset4 SF6 technology
MCset is metalenclosed
switchgear with
rack-out units
designed
for indoor
installation.
MCset is designed
for the MV section
of HV / MV
substations
and high-power
MV / MV
substations
MCset4 catalogue
available:
AMTED 306032FR
AMTED 306032EN
04 2008.
PE56388
NEX24 vacuum technology
NEX24 is indoor,
metal-enclosed
switchgear designed
for the MV section
of HV / MV
and MV / MV
substations.
It is a medium
voltage equipment
comprising cubicles
with breaking
devices, sensors,
Medium Voltage
connections and
auxiliaries.
NEX24 catalogue:
AMTED 306006EN
07 2008.
Maintenance
and Services Guide
MV Distribution
24 kV
Distribution
Foreword
4
General
6
Operations to be performed
• Control
mechanisms
• Insulating
• Power
materials and vents
circuits
• Auxiliary
circuits
• Circuit
breaker maintenance
(SF6 - Vacuum technologies)
• Sepam
protection relay maintenance
8
9
10
11
12
14
Recommended frequency
• Normal
operating conditions
• Operating
conditions: in a corrosive atmosphere
18
20
Appendices
• Technical
• Safety
• For
reference guides
glossary
your safety (reminders):
- Personal protection equipment
- Tools and signs
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22
23
24
25
3
PE90008
Foreword
Maintenance and Services Guide
Medium-Voltage distribution - 24 kV
Maintenance of the equipment: responsibility
Electrical equipment may only
be maintained by qualified
engineers. Schneider Electric
accepts no responsibility
for the consequences
that may result from the use
of this document.
Operation of the equipment: user’s responsibility
Your Maintenance
and Services Guide
contains general
instructions for:
• reducing
equipment wear
and tear
(and / or failure),
• ensuring that
the equipment
is safe during
all installation,
repair and servicing
operations.
The user is responsible
for checking that the equipment
ratings are appropriate
for its intended use.
You must read the operating
and installation instructions
prior to commissioning or
maintenance and comply with
them. Failure to comply with
these requirements may affect
the correct operation of
the equipment and constitute
a hazard for the workforce
and the equipment.
Protective earthing
The user is responsible for
conforming to all the standards
and international and national
electrical codes in force
regarding the protective earthing
of all the equipment.
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5
General
Warning
PE90000
As Medium-Voltage devices fulfil safety functions,
they must be installed in accordance with certain
professional practices.
Similarly, preventive maintenance operations must be
strictly and regularly observed.
Certain maintenance operations can be carried out independently
by the Customer.
Two skills are essential:
• electrical qualifications,
• knowledge of the equipment to be maintained.
Electrical devices
must be maintained by specialist
electrical engineers.
Other very complex operations are however exclusively
the responsibility of Schneider Electric. This guarantees
that Customers enjoy optimised maintenance with respect to
the economy, security and availability of electrical energy:
• the engineers are highly qualified and have a thorough
knowledge of Schneider Electric's equipment and its various
technical levels; they have all the methods and procedures
specific to the different types of devices at their disposal,
as well as the advantage of feedback from the whole company,
• they have the relevant diagnostic tools and equipment for
the system they are working on,
• they carry with them the full catalogue of the appropriate
consumables and spare parts for each device, which are available
from local or regional stocks.
On request, Schneider Electric will be able to provide at any time:
• an installation diagnosis,
• if required, an appropriate maintenance programme,
• an appropriate maintenance contract,
• adjustments, where necessary.
Electrical
authorisation:
recognition of
a person's ability
to carry out the
tasks assigned
to him in complete
safety.
The scope
and limitations
of such tasks
are specified in
the authorisation
document.
Only employees
holding an
electrical
authorisation
document will
be allowed
to carry out
these maintenance
operations.
This document
is not intended
to be used as
a guide by anyone
who has not
completed the
relevant training.
In the event of a problem during a maintenance operation, please contact your usual
Schneider Electric representative.
6
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Intervention levels
Different skill levels have been established to define
the persons who are competent to work on Medium-Voltage
equipment.
The five intervention levels developed follow the life cycle
of the equipment, whilst at the same time defining the levels
of complexity.
1
Regular maintenance. The maintenance operations to be carried out on
the equipment are generally described in the instruction handbook. They
include minor preventive maintenance operations not requiring the removal
of any parts of the equipment and servicing by replacement with standard
parts provided for this purpose, carried out by a technician authorised to do
so by the user, according to the manufacturer's maintenance instructions.
Level
2
Operations requiring simple procedures and / or support equipment
(integrated into devices or external) that is easy to use and
implement.
Level
3
Preventive maintenance operations, such as general adjustment,
identification and troubleshooting, repairs by exchanging components
or functional units, minor mechanical repairs carried out by
a specialised technician using the tools and adjusting and measuring
instruments specified in the manufacturer's maintenance instructions.
Level
4
Operations whose procedures involve knowledge of a specific
technique or technology and / or the use of specialised support
equipment. All important corrective or preventive maintenance
operations carried out by the manufacturer's after-sales services.
Operations that may affect switchgear performance.
Level
5
Operations whose procedures involve know-how requiring the use of
particular techniques or technologies, industrial processes or support
equipment. Equipment will generally have to be returned to the factory.
This applies only to moving parts.
Level
Formation
Training
Schneider Electric offers a wide choice of training courses on how
to operate or maintain its equipment. Level 3-4-5 operations require
training on the equipment.
Training programme
This training is delivered in our training centres by Schneider
Electric's accredited qualified staff.
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7
DE90035
Operations to be performed
Equipment must be OFF.
Control mechanisms
Safe operation will be maintained by general dust
removal / cleaning, appropriate lubrication and using
the device regularly.
Dust removal
A vacuum cleaner must be used for this operation. Do not use
compressed air for this cleaning operation.
Cleaning
Degreasing
A completely clean dry cloth or brush, free from any kind
of solvent, must be used for this operation. High-pressure
spraying with products containing solvents (trichloroethane,
trichloroethylene) is strictly prohibited.
The main disadvantages of such spraying may be:
• impossibility of reapplying grease to inaccessible lubrication
points (greased for life),
• corrosion or friction on non-regreased areas,
• deterioration due to jet pressure,
• risk of overheating due to the presence of insulating solvent
on the contact areas,
• removal of special protection,
• deterioration of plastics.
Lubrication
This operation is carried out after certain mechanical joints,
such as those described in the maintenance procedures,
have been cleaned. Greases recommended by Schneider Electric
must be used. Never apply too much grease, because excessive
greasing combined with dust can cause the mechanism
to malfunction.
Grease must never be applied to insulating parts.
Operation
The requirement for an installation to run continuously generally
means that the power devices are seldom operated. Although
the ageing process of a device may be accelerated if it is used
too frequently, mechanical malfunctions may occur if it is not
operated for a long period of time. Regular operation is necessary
to maintain the original performance of each operating unit.
Interlocking with keys or padlocks must be fully tested to check
that they are working correctly.
PE90020
1
PE90022
2
Dust, impacts,
aggressive
atmosphere,
insufficient
or excessive
lubrication may
adversely affect
the mechanical
operation of
a device.
PE90021
3
1 - MCset 4 :
medium-voltage
compartment flap control
2 - MCset 4 :
voltage transformer
extraction truck
3 - MCset 4 :
rack-out circuit-breaker
guide rails
8
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DE90036
Insulating materials and vents
Do not walk on the parts,
assemblies and areas
identified by this pictogram.
Dust deposited in various parts of the cubicle
may adversely affect the electrical operation
of a Medium-Voltage device.
Dust removal
Insulating materials
Note: too much dust on insulating materials may generate
partial discharges that may ultimately cause dielectric flashover
or internal arcing.
As for the control mechanisms, a vacuum cleaner must be used
to extract the dust.
For parts that are difficult to access, use a dry cloth, taking care
not to accumulate any dust on the insulating material.
During this operation, check that there is no foreign matter,
corona or partial discharge indicated by a change of colour
or degradation of the insulating material.
1
PE90017
PE90016
Air vents
Note: the air vents must also be cleaned to help the air to circulate
in the cubicle and avoid overheating. In all cases, the cubicle must
be thoroughly cleaned, especially the back of the cubicle.
A vacuum cleaner must be used to extract the dust. Natural
ventilation is required for the cubicles.
Such cleaning is mandatory for versions with forced ventilation
(fans mounted on the top of the cubicle).
The frequency of these operations depends on the environmental
and operating conditions.
2
1 - NEX24 :
insulating supports
2 - NEX24 :
air vents
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9
Operations to be performed
Power circuits
The connections between the various switchboard
distribution systems (busbars, cables) and
the switchgear are an important source of heat dissipation.
Sliding connections (rack-in)
They consist of two parts: clip and rack-in connector.
This type of connection requires appropriate regular cleaning in
accordance with the procedures described. The grease makes it
easier to connect the clips and rack-in connectors and prevents
damage to the silvered surface by reducing the rack-in force.
In the case of a sulfiding corrosive atmosphere (H2S / SO2), the
indications specific to each range must be observed.
Special greases can be used to protect silver- and copper-plated
contacts from sulphurisation.
Silver or copper sulphides reduce contact quality. They cause
the contact resistance to increase, which results in increased
overheating.
As grease deteriorates over time, it must be replaced regularly.
Fixed connections (connection by lugs or busbars)
Any tightening
that does not
conform to
the recommendations can cause a
thermal runaway
resulting in
the degradation of
the device, insulating materials and
cables, which may
degenerate into
a short-circuit
and / or fire.
This type of connection does not require special maintenance if it
is carried out according to Schneider Electric's recommendations
(torque, class 8.8 screws and bolts and contact washer).
Otherwise, regularly check the heating points (change in
the colour of the copper / surface defect) and remove
the connection, polish the contact parts and reassemble them
with new screws and bolts.
Standard tightening torques (non-greased screws and bolts)
The table opposite indicates the tightening torques for class 8.8
screws and bolts with contact washer and nut.
PE90018
1
Screw
ø6
ø8
ø 10
ø 12
ø 14
Torque in Nm
13
28
50
75
120
PE90023
2
1 - NEX24:
power connections
2 - MCset 4 : `
cable connection
10
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Low-Voltage auxiliary circuits
• Protection relay
• Auxiliary wiring
• Indication contacts
Protection relay
An electrical fault on the installation is detected by the relay
which orders the circuit breaker to open in order to ensure
that the equipment and operators are protected.
Electronic components and cards are sensitive to the environment
(ambient temperature, humid and corrosive atmosphere) and
to harsh operating conditions (magnetic fields, vibrations, etc.).
To ensure safe operation, the following must be checked
at regular intervals:
• the tripping chain,
• the intervention times according to fault current levels.
For further
information,
please see
the following
pages which
describe how
to maintain
Sepam devices.
Auxiliary wiring
Auxiliary wiring is used to transmit orders to the various control units
of the device and retrieve its states. A degraded connection
or insulating material may prevent the device from operating
or cause unwanted tripping.
The auxiliary wiring must be checked and replaced at regular
intervals, if necessary, especially in the event of vibrations,
a high ambient temperature or corrosive atmospheres.
Indication contacts
PE90024
The contacts indicating the position of the circuit breaker, earthing
switch, voltage transformer truck and ready-to-operate circuit breaker
allow the operator to view the states and to act accordingly. Any incorrect indication can lead to device control errors that may endanger
the operators.
Contact failure (worn contacts, loose terminals) may be the result
of vibrations, corrosion or abnormal overheating; preventive maintenance
must ensure good continuity (or non-continuity) of the contact in
the different states.
MCset 4 : Low-voltage
compartment
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11
Operations to be performed
Circuit breaker maintenance
A circuit breaker is a safety device used to operate
and protect electrical distribution networks. It is fitted in
a cubicle to protect all the downstream components
in the event of a short-circuit.
Rack-out circuit breaker with SF6 technology
Checking the internal pressure of the circuit breakers
The internal pressure of the circuit breakers must only be checked
in the event of an SF6 alarm and such checks must be performed
by Schneider Electric's specialist engineers.
The SF6 circuit breaker is classed as a sealed system. When it is
manufactured, the leakage rate of each enclosure is measured.
We can therefore be sure that the leakage rate is less than the loss
specified in the standard.
If an SF6 pressure drop is indicated, you are advised to remove
the circuit breaker from service and call in Schneider Electric
to diagnose the fault in the malfunctioning device.
Pole maintenance
The pressurised SF6 gas inside the poles retains all its dielectric
properties after breaking.
Electrical endurance is limited by contact wear.
Contact wear depends on how much the device is used.
We wish to draw your attention to the dangers of using a cleaning
process that involves spraying solvents at high pressure.
The main disadvantages of such a process are as follows:
• damage due to jet pressure and impossibility of relubricating
inaccessible fixing points,
• risk of overheating due to solvent pressure in contact areas,
• removal of special protection.
A dry cloth must be used for cleaning.
Circuit breaker
maintenance
operations such
as visual checks,
cleaning with
a degreasing
agent, removal
/ replacement,
checking for wear,
dust removal, etc.
are detailed and
explained in the
technical reference
guides at your
disposal.
The operations are
carried out on the
pole enclosure,
the control parts
(springs, control
unit, latching
mechanism, gear
motor) and the
pole mechanism.
Important
Insulating parts must be cleaned with a soft, dry, lint-free cloth.
Cleaning processes that involve spraying a pressurised insulating solvent and using
degreaser aerosols are absolutely forbidden.
The parts must be cleaned to remove the old grease before new grease is applied.
An electrical or mechanical solvent cleaner must be used for cleaning, depending on
the part to be cleaned.
12
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Circuit breaker maintenance
Rack-out circuit breaker with vacuum technology
Prerequisites
Description
escription
Before carrying out any work:
• open the device,
• remove the device from the cubicle,
• switch off the supply to the power and auxiliary circuits,
• release the opening mechanism, if necessary…
Action
Frequency Supplies
Medium
10 years
Cloth
Circuit breaker propulsion truck
Linear cam
Worm screw
Clean with
a degreasing agent
Grease
Clean with
a degreasing agent
Grease
Non-chlorinated
grease solvent
Isoflex Topas L152 grease
10 years
10 years
Non-chlorinated
grease solvent
Isoflex Topas L152 grease
10 years
Brush
Cloth
The device is
designed to be used
for 10 years
or 10,000 operations
in normal use,
in compliance with
IEC 62271.
Recommendations:
• Open / Close
at least once a year,
• Perform a visual
check at least every
five years.
Brush
Circuit breaker notching pins and fingers in the bushing
Clean with
a degreasing agent
Grease, oil
10 years
10 years
Non-chlorinated
grease solvent
Amblygon TA 15/E2
Cloth
Brush
PE90038
Conditions for intervention and special equipment.
Please see the technical reference guides at your disposal.
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7896901 FR
Disjoncteur – Notice d’utilisation SF2 fixe.
7896901EN
Circuit breakers. Instructions for use – SF2 fixes.
07897134FR
Disjoncteur – Notice d’utilisation – SF1 fixe à commande GMh.
07897134EN
Circuit breakers. Instruction for use – Fixed SF1 with GMh operating mechanism.
07897401FE
RM6. Remplacement d’une commande Q. Replacing a Q operating mechanism.
07896866FR
Notice d’utilisation. SF disjoncteurs débrochables – MCset 4.
07896866EN
Instruction for use. Draw-out SF circuit-breakers in MCset 4.
07897530EN
User manual. Evolis circuit-breaker 24 kV.
07897531EN
Installation guide. Evolis circuit-breaker 24 kV.
07897591EN
User manual. Evolis 24 kV – Earthing truck.
07897608EN
Installation guide. Earthing switch up to 24 kV (SMALT).
13
Operations to be performed
Sepam protection relay maintenance
The Sepam range of protection relays is suitable
for all Medium-Voltage public or industrial distribution
network protection applications.
They satisfy the requirements of IEC 61850.
PE55170
The range consists of three series of relays, in ascending order of performance
• Sepam series 20, for usual applications,
• Sepam series 40, for demanding applications,
• Sepam series 80 for customised applications.
All function protection:
• effective protection of people and property,
• accurate measurements and detailed diagnosis,
• integral equipment control,
• local or remote indication and operation.
The protection
system comprises:
protection relays
and measuring
devices (Sepam)
+ circuit breakers
+ instrument
transformers.
Safety instructions
• Only qualified operators familiar with all the installation instructions
are authorised to work on the facility.
• Switch off all power supplies before working on this equipment.
• Always use an appropriate voltage detection device to check
that the power supply is off.
• Before carrying out visual checks, tests or maintenance operations,
disconnect all current and voltage sources. Start from the principle
that all the systems are powered on until they have been completely
powered off, tested and labelled. Pay particular attention to the
design of the power circuit. Take account of all the power supply
sources and, in particular, any possible power supplies outside
the cubicle in which the equipment is installed.
Failure to comply with these
instructions may
result in serious
or fatal injuries.
• Handling this product requires the appropriate skills related to the
protection of electrical networks. Only engineers with the relevant
skills are authorised to configure and adjust this product.
• Before carrying out a dielectric strength test or an insulation test
on the cubicle in which the Sepam is installed, disconnect
all the Sepam connection wires. High-voltage tests may damage
the electronic components.
14
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Sepam protection relay maintenance
General
The logic inputs and outputs and analogue inputs are the parts of
Sepam that are the least well covered by the self-tests.
They should be tested during a maintenance operation.
It is recommended that preventive maintenance be carried out
every five years.
For the list of Sepam self-tests, please refer to the operating
instructions and technical reference guides at your disposal.
Maintenance tests
Carry out all the commissioning tests recommended for the type
of Sepam to be tested, apart from the test specific to the earth
leakage protection function, which is not necessary.
Depending on the module installed, voltage input tests
may be required.
Give priority to testing the logic inputs and outputs which
are involved in tripping the circuit breaker.
Testing the complete system which includes the circuit breaker
is also recommended.
For information on how to maintain Sepam devices,
see the “Commissioning” chapters in the available technical
reference guides.
Repairs by
replacement:
when the Sepam
or a module
is deemed
to be faulty,
replace it with
a new product or
module, as these
items cannot be
repaired.
Important
Risk of damaging the Sepam
• do not open the Sepam base unit,
• do not attempt to repair Sepam components, the base unit or accessories.
Failure to comply with these instructions may damage the equipment.
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15
Operations to be performed
Sepam protection relay maintenance
Sepam is in the fallback position.
The failures detected are considered to be major faults.
MINOR fault
Sepam is not working properly.
The base unit is working (all the protection devices activated
are operating) and indicates that one of the optional modules is faulty,
or that a module is configured but not connected.
Self-tests
A number self-tests are performed in the Sepam base unit and
additional modules.
The purpose of these self-tests is to:
• detect faults that may lead to unwanted tripping or to a failure to trip
when a fault occurs,
• put the Sepam in a safe fallback position to avoid any unwanted action,
• notify the operator that a maintenance operation is required.
Fault message
on display: major
fault.
MT10848
In practical terms, the “Sepam Diagnosis” software screen provides
access to information on the status of the base unit and optional
modules.
According to the type of faults detected, these pages contain
descriptions of the alarm messages, the possible causes and
the corresponding actions / remedies.
List of self-tests to be consulted in the technical reference guides
at your disposal.
Major faults are
only cleared after
the cause of the
fault is corrected
and Sepam is
switched on again.
PE10139
MAJOR fault
PE50359
Troubleshooting: major or minor faults;
the list of self-tests is available in the "Control
and monitoring" chapter of the Sepam technical guides.
“Sepam Diagnosis”
screen SFT2841.
16
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Sepam protection relay maintenance
About the test and measuring equipment …
In short, the equipment required will contain the following devices:
• generators (sinusoidal AC current, sinusoidal AC voltage
and DC voltage),
• measuring instruments (ammeter, voltmeter, phasemeter),
• the basic IT equipment (correctly configured PC, software
and connection cables),
• the reference documents (comprehensive connection diagrams
for the Sepam device and its additional modules, bills of materials
and hardware installation rules, all the Sepam parameters
and settings available in paper format).
MT50298
Conditions for intervention and special equipment.
Please see the technical reference guides at your disposal.
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301005FR
Protection des réseaux électriques – Sepam série 20 – Notice d’utilisation.
301005EN
Electrical network protection – Sepam series 20 – User’s manual.
301006FR
Protection des réseaux électriques – Sepam série 40 – Notice d’utilisation.
301006EN
Electrical network protection – Sepam series 40 – User’s manual.
303003FR
Protection des réseaux électriques.
Sepam série 80 – Installation, utilisation, mise en service et maintenance.
Notice d’utilisation.
303003EN
Electrical network protection.
Sepam series 80 – Installation, use, commissionning and maintenance.
Operation manual.
17
Recommended frequency
Normal operating conditions
The optimum recommended frequency is tailored to the product
life cycle, to anticipate requirements and optimise the global cost.
Ambient air temperature
• less than or equal to 40°C,
• less than or equal to 35°C, on average over 24 hours,
• above or equal to –5°C.
Environment
• no dust, smoke, salt, corrosive or flammable gas and vapour
(clean industrial air).
Altitude
• less than or equal to 1000 m,
• above 1000 m, a derating coefficient will be applied
(please consult us).
•
•
•
•
average
average
average
average
relative humidity over 24 hours < 95 %,
relative humidity over 1 month < 90 %,
vapour pressure over 24 hours < 2.2 kPa,
vapour pressure over 1 month < 1.8 kPa.
PE56371
Humidity
The maintenance
programme must be
carried out on
the cubicles as soon
as they are commissioned and then every
five years at most;
the maintenance
operator must have
the required skill level.
These operations
are applicable for
the environmental and
operating conditions
that meet the normal
service conditions,
in accordance with
IEC 62271-1 for indoor
switchgear.
DE52970
About condensation
18
Condensation is the transformation of a gas or vapour into liquid. It occurs in air
when the latter is saturated with water vapour and results in the formation of liquid water.
Remedies to reduce and / or resolve condensation problems:
• provide optimum ventilation conditions,
• avoid temperature variations,
• remove any sources of humidity in the vicinity of the substation,
• install an air-conditioning system,
• ensure that the cabling conforms to the applicable rules,
• consider the resistors.
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Check
Frequency Tools - Products Intervention
(year)
level
Power down
Approximate
intervention
time
Reference
document
Please see
the list of technical
reference guides.
COM*
5
Cubicle Switchboard
Visually check the general condition of
the cubicle (front panel, control unit, box, frame)
■
-
-
1
-
-
15 mn
Check the voltage transformer fuses
(if necessary, replace the three fuses
at the same time)
-
■
Multimeter (2)
2-3
-
-
1h 30 mn
Check the fuses in the feeder cubicles fitted
with fused switches (if necessary, replace the
three fuses at the same time)
-
■
Multimeter (2)
2-3
■
-
1h 30 mn
Switchgear
Removable devices
Remove and replace the circuit breaker (MCset 4)
Remove and replace the rack-out circuit breaker
(NEX24)
-
■
-
1
-
-
15 mn
Remove and replace the voltage transformer
frame
-
■
-
1
-
■(1)
45 mn
- Removable racked-in or racked-out part
-
■
-
1
-
-
30 mn
- Earthing switch
-
■
-
1
-
■
30 mn
- Racked-out voltage transformer
-
■
-
1
-
■
30 mn
-
■
Grease for
electrical use
1
-
■
1h
Open / close the moving parts manually and electrically (refer to the switchgear specific documents)
■
-
-
1
■
-
30 mn
Open / close the earthing switch manually
-
■
-
1
-
■(1)
1h
Mobilith SCH100
grease to be applied
to the moving parts
3-4
-
■
1h
3-4
-
■
1h
Please see
the list of technical
reference guides.
Check the operation of the position contacts
Replace the grease on the rack-in
connectors
Control mechanisms (p.8)
Remove the dust and grease the earthing switch control
-
■
Remove the dust and grease the flap control
-
■
Remove the dust from the moving part
guide rails
-
■
-
3-4
■
-
30 mn
Operate the key-operated interlocks
-
■
-
1
-
■
1h
Operate the rack-in inhibition
mechanism
-
■
-
1
■
-
15 mn
- Outside
■
-
-
1
-
-
30 mn
- Inside
Please see
the list of technical
reference guides.
Insulating materials and vents (p.9)
Remove the dust from the air vents
-
■
-
3-4
-
■
30 mn
Remove the dust from the fans (MCset 4)
(on cubicles according to performance)
-
■
-
3-4
-
■
1h
Remove the dust from the insulating materials
-
■
-
3-4
-
■
3h
■
■
Calibrated torque
wrench
2-3
-
■
3h
Please see
the list of technical
reference guides.
Power circuits (p.10)
Check and retighten the connections, if necessary
(busbars, CTs, earthing switches, cables)
Control and indication auxiliaries (p.11)
Check that the auxiliary wiring is uninterrupted
and the appearance of the insulating material
-
■
-
1
-
■
1h 30 mn
Check the tripping chain
-
■
-
1
-
■
1h
* Commissioning - (1) Power down the cubicle according to its configuration in the switchboard (for example, the feeder cubicle). - (2) To be selected according to the fuse ratings.
DEAI07EN.indd
19
Recommended frequency
Operating conditions in a corrosive atmosphere
PE90036
The optimum recommended frequency is tailored to the product
life cycle, to anticipate requirements and optimise the global cost.
The operating conditions in certain fields of activity require
additional measures to be included in the maintenance
programme under normal conditions so that the impact of
atmospheric pollutants can be taken into account.
Pollution:
SO2 = sulphur dioxide,
H2S = hydrogen sulphide.
These types of atmospheric pollutants are mainly found
in heavy industry, such as refineries, the iron and steel industry,
paper mills, the petrochemical industry, etc.
When these pollutants are combined with humidity, they are
highly corrosive for the parts used in our equipment:
• bare copper, silvering for electrical contacts,
• control mechanisms.
Note
If it is not completely protected (by enclosures providing
a sufficiently high degree of protection - IP), the Medium-Voltage
equipment must be cleaned at regular intervals to guard against
deterioration due to pollution.
Cleaning is a critical process. The use of inappropriate products
may cause irreversible damage to the equipment.
For cleaning procedures, please contact your usual Schneider
Electric representative.
The maintenance
programme must be
carried out on
the cubicles as soon
as they are commissioned and then every
three years at most;
the maintenance
operator must have
the required skill level.
These operations
apply to the H2S
specific MCset
switchboard for
the environmental and operating
conditions specific
to the conditions
as defined.
About pollution problems...
If no precautions are taken, pollution will be deposited on:
• the insulating parts, causing deterioration via a corona effect (crackling) and tracking,
• the metal parts, causing corrosion.
Remedies to reduce and / or remove the consequences of exposure to large
amounts of pollution:
• fit grilles (V-shape) to the substation vents to minimise the ingress of dust and pollutants,
• keep the substation ventilation to the minimum required to evacuate the heat generated
by the transformer, thus minimising the ingress of dust and pollutants,
• use Medium-Voltage cubicles with a sufficiently high degree of protection (IP),
• use air-conditioning systems with filters to minimise the ingress of dust and pollutants.
20
DEAI07FR.indd
Check
Frequency Tools - Products Intervention
(year)
level
Power down
Approximate
intervention
time
Reference
document
Please see
the list of technical
reference guides.
COM*
5
Cubicle Switchboard
Visually check the general condition of
the cubicle (front panel, control unit, box, frame)
■
-
-
1
-
-
15 mn
Check the voltage transformer fuses
(if necessary, replace the three fuses
at the same time)
-
■
Multimeter (2)
2-3
-
-
1h 30 mn
Check the fuses in the feeder cubicles fitted
with fused switches (if necessary, replace the
three fuses at the same time)
-
■
Multimeter (2)
2-3
■
-
1h 30 mn
Remove and replace the circuit breaker (MCset 4)
Remove and replace the rack-out circuit breaker
(NEX24)
-
■
-
1
-
-
15 mn
Remove and replace the voltage transformer
frame
-
■
-
1
-
■(1)
45 mn
- Removable racked-in or racked-out part
-
■
-
1
-
-
30 mn
- Earthing switch
-
■
-
1
-
■
30 mn
- Racked-out voltage transformer
-
■
-
1
-
■
30 mn
-
■
Grease for
electrical use
1
-
■
1h
Open / close the moving parts manually and electrically (refer to the switchgear specific documents)
■
-
-
1
■
-
30 mn
Open / close the earthing switch manually
-
■
-
1
-
■(1)
1h
Mobilith SCH100
grease to be applied
to the moving parts
3-4
-
■
1h
3-4
-
■
1h
Switchgear
Removable devices
Please see
the list of technical
reference guides.
Check the operation of the position contacts
Replace the grease on the rack-in
connectors
Control mechanisms (p.8)
Remove the dust and grease the earthing switch control
-
■
Remove the dust and grease the flap control
-
■
Remove the dust from the moving part
guide rails
-
■
-
3-4
■
-
30 mn
Operate the key-operated interlocks
-
■
-
1
-
■
1h
Operate the rack-in inhibition
mechanism
-
■
-
1
■
-
15 mn
Please see
the list of technical
reference guides.
Insulating materials and vents (p.9)
Remove the dust from the air vents
- Outside
■
-
-
1
-
-
30 mn
- Inside
-
■
-
3-4
-
■
30 mn
Remove the dust from the fans (MCset 4)
(on cubicles according to performance)
-
■
-
3-4
-
■
1h
Remove the dust from the insulating materials
-
■
-
3-4
-
■
3h
■
■
Calibrated torque
wrench
2-3
-
■
3h
Please see
the list of technical
reference guides.
Power circuits (p.10)
Check and retighten the connections, if necessary
(busbars, CTs, earthing switches, cables)
Control and indication auxiliaries (p.11)
Check that the auxiliary wiring is uninterrupted
and the appearance of the insulating material
-
■
-
1
-
■
1h 30 mn
Check the tripping chain
-
■
-
1
-
■
1h
* Commissioning - (1) Power down the cubicle according to its configuration in the switchboard (for example, the feeder cubicle). - (2) To be selected according to the fuse ratings.
DEAI07EN.indd
21
Appendices
Technical reference guides
Conditions for intervention and special equipment.
Please see the available technical reference documents.
PE90032
MCset4
07897546 FR / EN
Génie civil – Civil engineering guide.
07897542 FR / EN
Notice d’installation – Installation instruction.
07897541 FR / EN
Notice d’utilisation – Instruction for use.
51190295 FO EN
Génie civil – Civil engineering guide.
51190297 FO EN
Notice d’installation – Installation instruction.
51190298 F0 EN
Notice d’utilisation – Instruction for use.
PE90033
NEX24
PE90000
Sepam protection relays
301005FR
Protection des réseaux électriques – Sepam série 20 – Notice d’utilisation.
301005EN
Electrical network protection – Sepam series 20 – User’s manual.
301006FR
Protection des réseaux électriques – Sepam série 40 – Notice d’utilisation.
301006EN
Electrical network protection – Sepam series 40 – User’s manual.
303003FR
Protection des réseaux électriques. Sepam série 80 – Installation, utilisation,
mise en service et maintenance. Notice d’utilisation.
303003EN
Electrical network protection. Sepam series 80 – Installation, use,
commissionning and maintenance. Operation manual.
PE90034
Circuit breaker moving part
22
7896901 FR
Disjoncteur – Notice d’utilisation SF2 fixe.
7896901EN
Circuit breakers – Instructions for use – SF2 fixes.
07897134FR
Disjoncteur – Notice d’utilisation – SF1 fixe à commande GMh.
07897134EN
Circuit breakers – Instructions for use – Fixed SF1 with GMh operating mechanism.
07897401FE
RM6 – Remplacement d’une commande Q – Replacing a Q operating mechanism.
07896866FR
Notice d’utilisation. SF disjoncteurs débrochables – MCset 4.
07896866EN
Instruction for use. Draw-out SF circuit-breakers in MCset 4.
07897530EN
User manual. Evolis circuit-breaker 24 kV.
07897531EN
Installation guide. Evolis circuit-breaker 24 kV.
07897591EN
User manual. Evolis 24 kV – Earthing truck.
07897608EN
Installation guide. Earthing switch up to 24 kV (SMALT).
DEAI07EN.indd
Safety glossary
DANGER: Risk of electrocution, burns or explosion
Before taking any action ... remember that to avoid any accidental
contact with live parts, all the equipment must be powered off
before each operation.
Check that there is no voltage present on any incoming and feeder
areas.
Every operation carries a risk of electrocution, burns or explosion
inside or outside the equipment.
Only qualified engineers are authorised to inspect and repair
the equipment and comply with all the safety requirements.
In the event of a problem during a maintenance operation
Please contact your usual Schneider Electric representative.
Safety and intervention instructions, personal protection equipment,
tools and indication
Failure to comply
with these safety
measures can
cause serious
accidents, or even
prove fatal to
the employees.
PE90037
Please refer to the local regulations and legislation.
Golden rule
All work performed
on equipment or
premises where
there is a risk of
electric shock
must preferably
be carried out on
an installation that
is powered off
to ensure that
the installation and
the engineers are
electrically safe.
DEAI07EN.indd
23
Appendices
DE90008
DE90007
DE90005
DE90003
Over-gloves
Shoes
Helmet
Insulating gloves
24
DE90006
DE90002
DE90004
For your safety: personal protection equipment
Faceshield
… and related products
Work clothes
DEAI07EN.indd
DE90029
DE90030
DE90033 EN
DE90026
DE90027 EN
NO
E
T OPER
AT
DE90032
PADLO
C
VAT
1 000 V
DE
V
DE90021
DE90017
DE90011
DE90020
20 kV
DE90031
DE90012
DE90016
Insulating
material
DE90028 EN
DE90025
DE90022 EN
DE90010
DE90019
500 V
DE90034
DE90023
O
D
KE
ICE
D
DEAI07EN.indd
DE90024
DE90015
DE90018
DE90014
DE90013
DE90009
For your safety: tools and signs
24 kV
9V
1 000 V
1 000 V
CO2
Insulating material
1 000 V
Isolant
24 kV
25
ART960247 © Schneider Electric Industries SAS - All rights reserved
Maintenance and Services Guide
Medium-Voltage distribution - 24 kV
Schneider Electric Industries SAS
Head Office
35 rue Joseph Monier
CS 30323
92506 Rueil-Malmaison
www.schneider-electric.com
As standards, specifications and designs change from time to time, please ask for confirmation of
the information given in this publication.
This document has been
printed on ecological paper.
Publishing: SYNTHESE ECA, Schneider Electric.
Printing:
DEAI07EN
10/2008
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