Download Englische Musterspec. für 8DN9

Contents
Page
1. Scope of supply/validity of the specification ....................................................... 2
1.1. Switchgear ............................................................................................ 2
1.2. Overhead line, cable and transformer terminals ................................... 3
1.3. Instrument transformers ........................................................................ 3
1.4. Low voltage equipment ......................................................................... 3
2. Standards ........................................................................................................... 4
2.1. Switchgear ............................................................................................ 4
2.2. Overhead line, cable and transformer terminals ................................... 4
2.3. Instrument transformers ........................................................................ 4
2.4. Low voltage equipment ......................................................................... 4
2.5. Circuit-breaker ...................................................................................... 5
2.6. Disconnector and earthing switch ......................................................... 5
3. General design/safety requirements ................................................................... 6
3.1. Switchgear ............................................................................................ 6
3.2. Overhead line, cable and transformer terminals ................................... 8
3.3. Instrument transformers ........................................................................ 8
3.4. Low voltage equipment ......................................................................... 9
3.5. Circuit-breaker ...................................................................................... 11
3.6. Disconnector ......................................................................................... 11
3.7. Earthing switch ...................................................................................... 12
4. Quality assurance/testing and inspection ........................................................... 13
5. Packing/transport and storage ............................................................................ 15
6. Installation/site testing ........................................................................................ 16
7. Maintenance/spare parts and tools .................................................................... 16
8. Documentation/nameplates ................................................................................ 17
Appendix/technical data sheets/drawings
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1. Scope of supply/validity of the specification
1.1. Switchgear
1.
This specification covers the requirements for the supply of a metal-enclosed,
gas-insulated, indoor switchgear for the rated voltage specified in the
"Technical Data Sheets". The switchgear shall be completely quoted, including
all components required for proper operation unless specifically excluded
herein.
2.
The specification covers the design, ratings, testing transport and packing of
factory assembled switchgear bays. The specification lays down general
aspects. More detailed and specified data are contained in the drawings, data
sheets and other documents that form parts of this specification.
3.
The layout shall be generally as shown on the drawings however, subject to the
provisions of this specification and the approval of the engineer, they may be
adjusted as necessary to suit the manufacturer's standard design.
4.
Standard designs and types of bidder's manufacturing program are preferred,
provided they meet the requirements of this specification and serve the
intended purpose.
5.
The bidder may also offer alternative solutions which deviate from the
specification.
6.
The switchgear described in this specification is intended for continuous duty at
the specified ratings and under the specified ambient conditions 24 hours a
day, 365 days a year unless indicated otherwise. Further details can be clarified
in negotiations between the supplier and the purchaser.
7.
All supporting structures for the switchgear bays, for the related overhead line-,
cable- and transformer-connection enclosures shall be a part of bidder's supply.
Foundations and embedded steel for reinforcement and levelling shall be
supplied by others.
8.
The field-installation and commissioning of the switchgear is not a part of this
inquiry. Special tools and equipment that are required to perform these services
(e.g. gas-service carts and HV test equipment) shall be offered separately in
the bid.
9.
The initial gas filling of the entire switchgear including the usual losses during
commissioning shall be included in the offer.
10. If necessary, SF6-insulated arresters shall be offered by the bidder along with
the switchgear.
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1.2. Overhead line, cable and transformer terminals
1.
The terminations for overhead lines shall be quoted completely with SF 6-to-air
bushings. Interconnecting, gas-insulated busducts and their supports are part of
the switchgear supply. Their individual lengths shall be adjusted to the
preliminary layout sketch included with the inquiry. The overhead line terminal is
a part of the overhead line supply.
2.
The gas-insulated cable connection enclosure and the associated conductors
are part of the switchgear supply. Stress cones and cable accessories are part
of the cable supply. Cables and cable terminations are not part of this inquiry.
The bidder shall submit drawings that clearly show the limits of his scope of
supply. The interfaces suggested by the bidder should confirm to the
requirements of the IEC recommendations for cable terminations stated in
paragraph 2.
3.
In case power transformers are to be connected to the switchgear via gasinsulated conductors, the gas-insulated connection bus with the terminal for the
conductor coming from the transformer shall form a part of the switchgear. The
conductor coming out of the transformer including the associated SF 6-to-Oil
transformer bushing are not part of this inquiry. Along with this offer, the bidder
shall submit suitable illustrations and sketches clearly showing the limits of his
scope of supply. Based on the layout sketches which form a part of this
specification, the bidder shall supply all necessary interconnection modules.
1.3. Instrument transformers
1.
Both, voltage and current transformers, form a part of the scope of supply and
shall be quoted along with the switchgear, confirm to the specified data.
1.4. Low voltage equipment
1.
Cubicles containing the control and interlocking equipment shall form a part of
each switchgear bay and must be included in the quotation. Plug-connected
control cables between the individual devices of switchgear bay and the
associated control cubicles form a part of this inquiry.
2.
The auxiliary power supply for control, indication, various drive mechanisms
and anticondensation heating shall be provided by the purchaser. The available
voltages are listed in the appendix. The bidder may suggest other voltages if
these correspond to the standard models of the manufacturer; however, this is
subject to approval by the purchaser.
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2. Standards
1.
The construction, the testing and the ratings of the switchgear must correspond
to the latest edition of the standards specified below.
2.
The proposed switchgear may conform to the standards of the country of
manufacturer, provided these standards are based on, or comparable to the
following preferred standards. Each bidder suggesting others than the preferred
standards must clearly state the standards to which his equipment conforms
and indicate all deviations from the preferred standards which may have an
effect on the function and the ratings of the switchgear.
3.
Compliance by the manufacturer with the standards of this specification does
not relieve him from the responsibility of supplying switchgear and accessories
of proper design, electrically and mechanically suitable for fulfilling the
operating guarantees at the specified service conditions.
4.
If, in the opinion of the bidder, there are any conflicts between these standards,
the data sheets and this specification, these contradictions shall be brought to
the attention of the purchaser.
2.1. Switchgear
IEC 694
IEC 517
IEC 376
IEC 480
IEC 99-1
(Common clauses for high-voltage switchgear and control gear
standards)
(High-voltage metal-enclosed switchgear for rated voltages of 72.5 kV
and above)
(Specification and acceptance of new sulphur hexafluoride)
(Guide to checking of sulphur hexafluoride taken from electrical
equipment)
(Part 1: Non-linear resistor type arresters for AC systems)
2.2. Overhead line, cable and transformer terminals
IEC 137
IEC 859
(Bushings for alternating voltages above 1000 V)
(Cable connections for gas-insulated metal-enclosed switchgear for
rated voltages of 72.5 kV and above)
2.3. Instrument transformers
IEC 44-4
IEC 185
IEC 186
(Instrument transformers. Measurement of partial discharges)
(Current transformers)
(Voltage transformers)
2.4. Low voltage equipment
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IEC 439
(Factory-built assemblies of low-voltage switchgear and control gear)
2.5. Circuit-breaker
IEC 56
IEC 427
(High-voltage alternating-current circuit-breakers)
(Report on synthetic testing of high-voltage alternating-current circuitbreaker)
2.6. Disconnector and earthing switch
IEC 129
IEC 1128
(Alternating-current disconnectors (isolators) and earthing switches)
(Alternating-current disconnectors. Bus-transfer current switching by
disconnectors)
IEC 1129
(Alternating-current earthing switches. Induced current switching)
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3. General design/safety requirements
3.1. Switchgear
1.
The switchgear must provide a maximum degree of safety for the operators and
others in the vicinity of the switchgear under all normal operating conditions and
under fault conditions (short-circuit).
2.
It must be impossible to touch any live part of the switchgear unwillingly, i.e.
without the use of tools or brute force.
3.
An operator standing in the normal operating position should not be
endangered by any moving external part of the switchgear.
4.
Interlocks must be provided to prevent any maloperation of the switchgear.
5.
If in spite of all possible safety measures an arc should occur, the following is
required:
- The effects of an internal arcing fault must be limited to the related gas
compartment by bushings.
- Each gas compartment must have its own pressure relief device to
provide instant and safe discharge of accidental overpressure during
internal arc. Rupture diaphragms shall be preferably used as pressure
relief mechanisms. Such gas discharge must be directed away from the
normal operation position of the switchgear so that persons standing there
are not endangered. If necessary, diverter nozzles shall be provided to
ensure that the gas is directed away from this position. Internal relief
devices between adjacent compartments are not acceptable.
- All earthing connections must remain operational.
- The enclosure of the switchgear must withstand the thermal effects of an
arc at the full rated short-circuit current until the nearest protective relay
has tripped.
6.
To limit the effects of an internal arc the switchgear shall be suitably subdivided
into individual arc and gas-proof compartments, at least for
- busbar isolators
- circuit breakers
- line isolators and cable connections
- potential transformers
7.
The following requirements are derived from or are in addition to the technical
data given in the appendix:
- The bracing of all components subject to mechanical forces caused by
short-circuit currents shall correspond to the values given in the data
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sheets; they must, however, withstand the effects of at least 2.5 times the
rated symmetrical short time withstand current.
- The thermal rating for all current carrying parts and insulating materials
shall be a minimum of 1s for the rated short time withstand current.
8.
Aluminium or aluminium alloys shall be used exclusively for the enclosures,
except for special components like bellow compensators.
9.
Manufacturers standard paint colour shall be used; a satin mat finish with a
high scratch resistance is preferred.
10. Pipings between gas compartments and gas monitoring and maintenance
fittings are not acceptable. Those fittings for gas monitoring and gas supply
shall be made of copper, aluminium, brass or high grade steel.
11. Joints of different metals that could lead to electrolytic corrosion must be
avoided.
12. All gas compartments shall be fitted with filter material which absorbs the
residual and entering moisture inside the high-voltage enclosure. Filters in gas
compartments with switching devices must also be capable to absorb the gas
decomposition products resulting from the switching arc.
13. Single sealings of O-ring type shall be used for sealing the connections
between the switchgear modules. The guaranteed leakage rate of each
individual gas compartment must be less than 1 % p.a.
14. The arrangement of the switchgear offered must provide adequate access for
checking and maintenance.
15. Each line-up of switchgear shall be suitable, and prepared for future extension
on either end without any drilling, cutting or welding on the existing equipment.
To add equipment, it shall not be necessary to move or dislocate the existing
switchgear bays.
16. The conductors shall be made of aluminium alloy or electrolytic copper. Both,
the conductors as well as the contacts for the conductor connections must be
designed for the continuous rated current of the switchgear under the ambient
conditions stated in the appendix and shall not exceed the permissible
temperature rise.
17. All components of the switchgear which are on ground potential shall be
electrically interconnected.
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3.2. Overhead line, cable and transformer terminals
1.
SF6-air bushings made of glazed porcelain located outdoors must be rated for
the actual insulation level of the switchgear.
2.
Each cable or transformer connection enclosure shall provide a facility for
isolating the cable or transformer bushing from the switchgear and for
application of a high-voltage test probe for dielectric testing.
3.3. Instrument transformers
1.
All instrument transformers must be suitable for continuous operation when
installed on the switchgear under the ambient conditions stated in the appendix
as well as under all rated and short-circuit conditions stated in the data sheets
or in the single line diagram.
2.
Toroidal current transformers of the single or multi-ratio type, mounted inside
the high-voltage enclosure with grounded cores are preferred.
3
The current transformer data are listed in the single line diagram. The rated
secondary current of current transformers shall be 1 A.
4.
Current transformers must have secondary terminals outside the high-voltage
enclosure, mounted in suitable, accessible terminal boxes. All secondary leads
of all current transformers must be wired to shorting-type terminals on the
terminal strip in the local control cubicle of each bay.
5.
Voltage transformers shall be of the metal-enclosed, gas-insulated inductive or
RC-divider type. They are to be mounted directly on the high-voltage enclosure
with plug-in contacts to allow easy removal.
6.
The voltage transformer data are stated in the single line diagram.
7.
The secondary terminals must be located in accessible, grounded terminal
boxes on the voltage transformer itself. The secondary connections must be
wired to a terminal strip in the local control cabinet.
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3.4. Low voltage equipment
1.
All control circuits shall be manufacturer's standard for the application on hand,
but shall be approved by the purchaser. Special functions shall be included if
indicated in the single line diagram, or if shown in special control specifications
accompanying this inquiry.
2.
All local control functions such as
- Switchgear interlocking functions
- Fuses or MCB's for Low voltage equipment
- Local operation of the switchgear
- Indicating and measuring equipment
must be located in the local control cubicle. This cubicle shall form an integral
part of the switchgear bay. It must have degree of protection IP 33 at least.
3.
All switchgear shall be interlocked by electromechanical, electrical or electronic
equipment. These interlocking facilities shall be located in the local control
cabinet of each bay. They must provide absolute and reliable protection against
any potentially harmful maloperation of the switchgear. The following functions
must be provided:
- The operator must be forced into the only safe and logical sequence to
actuate circuit-breakers, switches, disconnectors and earthing switches.
- The actual, completely closed or completely opened position of all
switching devices must be checked before and after each move.
- Implementation of logic checks and issuing the resulting signals ENABLE
or BLOCKED for the switching device.
- Manual local operation and automatic remote operation for all essential
functions.
- Local emergency unlocking equipment via safety key switch under full
responsibility of the operator.
4.
The gas monitoring of each bay must be carried out for all three phases
commonly. It must be located directly at the gas compartment monitored. The
gas monitoring must have suitable fittings and valves to fulfil the following
functions:
- for circuit-breaker compartments: rough indication and monitoring of the
gas density with alarm for drop in density, lock out of the circuit-breaker in
case of a further drop.
- For switchgear gas compartments: rough indication and monitoring of the
gas density in two stages.
- Additional monitoring of the gas density with alarm in case of increase of
density of gas compartments neighbouring compartments with a higher
density.
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- Access for evacuating, filling and topping via gas service cart.
5.
All control and monitoring equipment for the circuit-breaker and its accessories
shall be installed in a local drive control cubicle. The related control wiring shall
be wired to plug-in connectors. The cabinet must have degree of protection IP
33 at least.
6.
Each circuit-breaker shall be provided with at least two trip coils. Provisions for
manual emergency operation must be made. All circuit-breakers must be
suitable for remote control. Main contact position of all three poles must be
indicated by directly activated auxiliary position switches with at least 5 NO and
5 NC contacts wired to a plug connector in the local control panel for
customer's use. Each circuit-breaker shall be provided with an operations
counter.
7.
Finely-stranded copper wire of at least 1.5 mm2 cross-section shall be used
within the control cabinet for all control wiring. Manufacturer's standard crimptype terminations and screw line-up terminals suitable for a cross-section of at
least 2,5 mm² proofed against creepage currents shall be used. All
interconnecting wiring must be suitably protected against mechanical damage,
e.g. by routing them in protective channels or pipes.
10. Each control circuit - except the tripping circuit - shall be protected by a
miniature circuit-breaker with an auxiliary contact. The auxiliary contacts of all
MCBs shall be monitored as a common alarm.
11. Anti-condensation heaters shall be provided in the control cabinets, in the
operating mechanism housings of disconnectors, earthing switches and circuitbreakers.
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3.5. Circuit-breaker
1.
The circuit breaker shall be of three phase encapsulated type. The technical
data listed in the enclosure under "switchgear, general" are valid unless
otherwise stated.
2.
Only single-pressure, single-break, self-compression -type circuit-breakers with
SF6 as arc-quenching and insulating medium and with a minimum-maintenance
contact system are acceptable.
3.
The breaker operating mechanism shall preferably be of the spring type. It shall
be suitable for triple pole automatic reclosure.
4.
The operating mechanism shall be capable of performing a complete O-0,3sCO-3min-CO IEC sequence. On failure of the drive motor or breakdown of the
auxiliary voltages tripping of the breaker shall still be possible.
5.
A mechanical indicator shall display the position of the main contacts.
3.6. Disconnector
1.
The technical data listed in the enclosure under "switchgear, general" are valid
unless otherwise stated.
2.
The disconnectors shall be of the three-phase type. All switches shall be threephase linkage-operated by a maintenance-free self-contained electric motor.
3.
The actual position of each disconnector and earthing switch shall be indicated
by mechanically coupled auxiliary switches with at least 4 NO and 4 NC
contacts.
4.
Mechanical indicators connected directly and permanently to the drive
mechanism shaft are required to display the actual switch position.
5.
Provisions for emergency manual crank operation shall be made. Whenever
the crank is inserted in the drive mechanism it shall be impossible to operate
6.
the device electrically.
Disconnector and related earthing switch shall be mechanically interlocked to
each other.
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3.7. Earthing switch
1.
The technical data listed in the enclosure under "switchgear, general" are valid
unless otherwise stated.
2.
The earthing switches shall be of the three-phase type. All switches shall be
three-phase linkage-operated by a maintenance-free self-contained electric
motor.
3.
Earthing switches on the line side of overhead line feeders must have makeproof contacts and high-speed operating mechanisms so that they are suitable
for switching capacitive and inductive currents as well as for closing on to a
fault.
4.
The actual position of each earthing switch shall be indicated by mechanically
coupled auxiliary switches with at least 4 NO and 4 NC contacts.
5.
Mechanical indicators connected directly and permanently to the drive
mechanism shaft are required to display the actual switch position.
6.
Provisions for emergency manual crank operation shall be made. Whenever
the crank is inserted in the drive mechanism it shall be impossible to operate
the device electrically.
7.
Earthing switches and the related disconnector shall be mechanically
interlocked to each other.
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4. Quality assurance/testing and inspection
1.
Type-tests shall have been successfully carried out and been suitably
documented for the switchgear type proposed by the bidder. Test certificates
shall be presented by the bidder upon request.
2.
Routine tests of each switchgear bay have to be successfully carried out in
accordance with the standards listed in chapter 2.1. Routine tests on individual
components for which other IEC recommendations exist, shall be carried out in
accordance with these recommendations. Special tests may be agreed upon
between the manufacturer and the purchaser prior to order placement.
3.
Routine factory tests, minimum:
- Pressure test on each enclosure. The test pressure for all cast housings
shall be twice and for all welded housings 1.5 times the design pressure.
Gastight bushings between the gas compartments must be able to
withstand twice the service gas pressure at one side against 0 bar
(absolute) on the other.
- At least 10 % of all welds must be subjected to nondestructive X-ray or
ultrasonic methods (random checks, according to pressure vessel
regulations).
- Partial discharge test on each insulator before installation in the
switchgear. No measurable partial discharge (less than 10 pC) shall occur
on the insulator when 110 % of rated voltage is applied. This test must be
carried out on each post type insulator and bushing used in the
switchgear.
- Gas leakage test on each transport unit. A gas leakage test with a suitable
accuracy must be carried out on each transport unit before dispatch.
4.
The following tests shall also form a part of the routine tests. These tests may
be witnessed by buyer's authorised representatives on a noninterference basis:
- Power frequency voltage dry test and partial discharge measurements on
each transport unit
- Insulation test with 2 kV on all auxiliary circuits
- Resistance measurement of the main circuits of each transport unit
- Mechanical testing of the switching devices
5.
The purchaser must be informed at least two weeks in advance regarding tests
which he desires to witness. The purchaser shall immediately be informed of
any changes in the testing schedule.
6.
Authorised representatives of the purchaser shall be allowed access to all those
areas in the manufacturer's factory where the equipment covered by this
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contract is produced at all reasonable times for purposes of inspection and
obtaining information on the progress of work.
7.
Acceptance by buyers' representatives of any equipment shall not relieve the
manufacturer of his performance guarantees or from any of his other
obligations resulting from the order.
8.
The quality assurance system shall be based on and certified to an
internationally excepted standard. ISO 9001 is preferred.
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5. Packing/transport and storage
1.
The size of transport units shall be as large as possible so as to reduce the
amount of field installation work. Switchgear bays shall be transported as
completely assembled units ready to be lined up into a switchgear at site.
Auxiliary cabinets with secondary equipment shall be transported as completely
assembled units.
2.
The type of packing used must be suitable for the means of transportation used
from the manufacturer location to the installation site.
3.
The packing must, if required, be suitable for outdoor storage of the equipment.
In this case, sufficient drying agent shall be provided in the packing to absorb
condensed moisture.
4.
Care shall be taken to seal off connecting flanges of the individual switchgear
bays which are not yet connected to prevent damage and ingress of
contamination into the gas compartments. Machined sealing surfaces must be
suitably protected against mechanical damage and corrosion. Sealing surfaces
which are exposed to the atmosphere during transport must be protected by a
protective coating (such as Tectyl) which can be pealed or washed off during
installation.
5.
As far as possible the modules shall be prefilled with gas. The remaining
insulating gas for the initial filling of the switchgear shall be transported
separately in approved steel cylinders marked according to international
regulations.
6.
All interconnecting control cables which are not directly mounted on the bay
shall be packed separately and suitably marked.
7.
The static filters provided for the inside of gas compartments which are not
prefilled shall not be installed before transportation but separately packed in
airtight sealed tin cans and marked suitably.
8.
Marking of transport containers must be approved by the purchaser. Guidelines
for special marking must be followed meticulously to ensure positive
identification at the job site.
9.
A packing list must be provided for each individual packing unit to enable the
purchaser's personnel to identify the unit clearly at site.
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6. Installation/site testing
1.
The design of the switchgear bays shall minimise assembly work during
installation. Preference is given to completely factory-assembled switchgear
bays which require connection of the cable or overhead line on-site only.
2.
For installation and handling of the switchgear, the use of a stationary travelling
crane or hoist with a capacity of 1.5 t shall be sufficient.
3.
The bidder shall state in his offer the type of tests he will carry out at site.
Acceptance tests on site after installation of the complete switchgear must be
separately agreed between the manufacturer and the purchaser.
7. Maintenance/spare parts and tools
1.
Checking the contact condition of the interrupter unit must be possible without
disturbing any other gas compartment. It should be possible to safely replace
the interrupter contacts of the circuit-breaker even while the remaining
switchgear is "live". The circuit-breaker enclosure must have provisions for easy
withdrawal of the contact assembly. This procedure should not involve the
removal or dislocation of neighbouring bay enclosure parts. The removed
interrupter assembly must be easily and safely accessible for inspections and
possible repairs.
2.
The maintenance intervals of circuit-breakers shall not be less than 18 rated
short-circuit current interruptions, 6000 rated current interruptions or 25 years of
operation which ever is earlier. Maintenance activities shall comprise only
simple inspections and no exchange of parts or complex adjustments.
3.
Routine maintenance of external parts of the switchgear including instrument
transformers should not be necessary at intervals of less than 5 years.
4.
For routine inspections, all elements must be accessible without removal of
supporting structures. The removal of individual enclosure parts or complete
switchgear bays must be possible without disturbing the enclosures of
neighbouring bays.
5.
Accessories for proper operation of the switchgear must be included in the
basic price.
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8. Documentation/nameplates
1.
Technical descriptions, data sheets, catalogues and other material submitted
with the quotation must enable the purchaser's engineers to evaluate the
proposal to its compliance with the inquired specification.
2.
Layout and elevation drawings for the switchgear shall be part of the proposal.
These drawings shall show the recommended clearances for safe operation
and maintenance of the switchgear including the required lifting clearances for
installation.
3.
Minimum requirements for the offer:
- Deviations from the specification of the inquiry
- Fully filled-in data sheets of the inquiry
- Single line diagram of the switchgear as a proposal in case of deviations
from the single line diagram of the inquiry. The necessary busbar
arrangement and the number of outgoing feeders including the future and
final extensions shall be clearly shown in this single line diagram.
- Applicable design specification
- Brochures and catalogues as well as reference lists of installed
switchgears incl. customer identification and year of installation.
- Listing of the accessories included in the offer
- Listing of the Tests included in the offer
4.
In case of order, the following information and data shall be submitted to the
purchaser for approval:
- Updated data sheets, diagrams and listings as required for the offer
- Certified outline and floor cut-out dimensions including the necessary
clearances for installation, operation and maintenance as well as the
approximate static loads.
- Certified drawings of embedded levelling and supporting steel parts if
required by the design.
- Location of all devices, busbars and connections for the power cables and
overhead lines.
- Circuit diagrams and interlocking sequences as agreed upon
- Instrument transformer data
- Time schedule
- Location and identification of spare parts
- Installation, operation and maintenance instructions
5.
Copies of all routine test certificates shall be made available to the purchaser if
required.
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6.
All technical data provided for this equipment must show the switchgear as
specified and ordered. If any modifications in the switchgear are carried out
during execution of the order and installation, these must be clearly shown in
the drawings and documentation. The format, the standards as well as the
quality and number of drawings shall be in accordance with the manufacturer's
standard, but shall be subject to the purchaser's approval prior to order
placement.
7.
All dimensions shall be only in metric SI units. Bilingual documentation is
acceptable.
8.
Each switchgear bay shall be provided with a nameplate in accordance to IEC
517.
9.
Each instrument transformer must have its own nameplate in accordance to
IEC 185/186. These nameplates must be fitted adjacent to the secondary
terminal box of the instrument transformer. Inside of or adjacent to each
terminal box cover a durable noncorrodible circuit diagram of the instrument
transformer must be installed with all terminal and ratio markings of the device.
10. Every auxiliary control cubicle shall be marked with the designation of the
feeder it is assigned to.
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