technical specification for generator circuit breaker (gcb)

49
2x660MW (UNIT #1 &2) VOLUME – II TECHNICAL SPECIFICATION FOR GENERATOR CIRCUIT BREAKER (GCB) BHEL DOCUMENT NO. : PE-TS-435-510-E001 REV-1

Transcript of technical specification for generator circuit breaker (gcb)

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VOLUME – II

TECHNICAL SPECIFICATION FOR

GENERATOR CIRCUIT BREAKER (GCB)�����

BHEL DOCUMENT NO. : PE-TS-435-510-E001 REV-1

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SECTION – ‘I’

SPECIFIC TECHNICAL REQUIREMENTS ������������������

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1.1� This specification covers design, manufacture, assembly, inspection & testing at manufacturer's works, proper packing, delivery and supervision of E&C of Generator Circuit Breaker (GCB) as mentioned in different sections of this specification, complete with all accessories for efficient and trouble-free operation.

1.2� It is not the intent to specify completely herein all details of the design and manufacture. However, the equipment shall conform in all respects to high standards of design engineering and workmanship and shall be capable of performing in continuous commercial operation up to bidder’s guarantee.

1.3� Standard technical requirements of the ���� are indicated in Section-II. Project specific requirements/changes are listed in Section-I.

1.4� The requirements of Section-I shall prevail and govern in case of conflict between the corresponding requirements of Section-I and Section-II.

1.5� The documents shall be in English language and MKS system of units.

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S.No. Reference Clause No. of Section- II

Specific Requirement/ Change

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SECTION–3.7: GENERATOR CIRCUIT BREAKER 1.0.0 INTENT OF SPECIFICATION

This section covers the technical requirements of Generator circuit breaker (GCB).

2.0.0 SCOPE OF WORK

The scope of work shall include supply, installation, testing and commissioning of the following for each GCB: a) Circuit breaker with disconnector for series isolation on Transformer side. b) Grounding switches fitted both sides of unit and to all three phases. c) Voltage transformers on transformer side. d) Voltage transformers on generator side. e) Surge arrestor with surge counter on transformer side f) Surge capacitor on either side of circuit breaker g) Supporting structures and suitable platform. h) Operating mechanism i) Local control cubicle. j) A switched (motor operated) short circuiting connection between the power circuit breaker

and the series disconnector for maintenance and protection checking on generator side. k) A motor operated grounding link for the above short circuiting connection. l) Commissioning spares and consumables m) Mandatory spares n) Tools & tackles o) Any other equipment required for the system

3.0.0 CODES AND STANDARDS The equipment to be furnished under this specification shall be in accordance with the

applicable section of the latest version of the following Indian / IEC Standards, except where modified and /or supplemented by this specification.

a) IEEE C37.013 : AC Generator Circuit Breaker Rated on a Symmetrical Current Basis

b) IEC 62271-1 : High voltage switchgear and control gear – Common specification

c) IEC 62271-100 : High Voltage Alternating Current Circuit Breaker

d) IEC 62271-200 : AC Metal Clad Switchgear and Control Gear for Rated Voltage above 1kV up to and Including 52 kV

e) IEC 62271-300 : Seismic Qualification of Alternating Current Circuit-Breakers

f) IEC 62271-304 : Design Classes for Indoor Enclosed Switchgear and Control gear For Rated Voltages Above 1kV up to and including 52 kV To Be Used In Severe Climatic Conditions

g) IEC 62271- 102 : Alternating Current Disconnectors and Earthing Switches.

h) IEC 60376 : Specification of technical grade sulfur hexafluoride (SF6) for use in electrical equipment

i) IEC-60099 : Non-linear resistor type gapped surge arrestor for AC systems

j) IEC 60267 : Guide to testing of circuit breakers with respect to out of phase switching

k) IEC 60282 : High voltage fuses

on transformer side

A manual short circuiting connection between the power circuit breakerand the series disconnector for maintenance and protection checking on generator side.

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

l) IEC 60358 : Surge Capacitor

4.0.0 DESIGN REQUIREMENTS

4.1.0 GCB shall be provided for each generator in the turbine building. GCB shall be installed between the generator and generator transformer located in a hot, humid and tropical climate.

4.2.0 The voltage class of the Generator circuit breaker shall be same as that of the generator. 4.3.0 Ambient temperature prevailing inside the equipment while carrying rated current, when the

outside air ambient temperature is 50 degree C shall be considered as design ambient temperature for sizing the equipment/device/bus rating. Temperature rise shall be as per applicable IEC/IEEE standards.

4.4.0 For steam turbine generators, continuous current rating and interrupting current of the GCB shall be selected considering the generated power evacuation at valve wide open (VWO) condition.. A 10% margin shall be considered for both continuous current and interrupting current and rounded off to the next higher standard rating

4.5.0 The contractor shall ensure that GCB satisfies all requirements of IEEE C37.013.

4.6.0 The GCB shall be with an operating duty of CO-30 min-CO for short circuit current and O-3min-CO-3 min-CO for load current.

4.7.0 GCB shall be used for the following:

a. Synchronising the generator to the system b. Connecting and disconnecting the generator from the system under out-of phase

conditions. c. Connecting the generator to the system under fault conditions i.e. switch on to fault d. Interrupting load and fault current from network and generator source within the interrupting

capability specified. e. House load operation while isolated from grid i.e. with the generator transformer HV

breaker in open position. f. Transferred surges from HV side of generator transformer

4.8.0 The main current carrying parts shall be able to carry the rated current continuously without exceeding the temperatures specified in IEEE C37.013.

4.9.0 The short time current rating of the GCB shall be decided considering higher of the short circuit current contribution from generator or the short circuit current contribution from EHV system through generator transformer and contribution of HV auxiliary system through Unit transformers.

4.10.0 The connections and GCB shall be designed to withstand full ½ cycle instantaneous and asymmetrical peak maximum currents under short circuit fault conditions. The connections & GCB shall be rated to carry the full unrestricted fault current for 3 seconds

4.11.0 Momentary current rating shall be calculated based on X/R ratio of EHV system, HV system

and generator.

4.12.0 The breaker shall meet the transient recovery voltage (TRV) requirements specified in IEEE C37.013 for system source faults and generator source faults. The applicable values shall be adjusted for 50 Hz operation.

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

4.13.0 The breaker shall also be capable of withstanding and interrupting the out-of-phase switching currents and inherent TRV conditions required in accordance with IEEE C37.013 (adjusted for 50 Hz operation).

4.14.0 The breaker shall be capable of interrupting its rated interrupting current after trip coil has been energised within the specified time.

4.15.0 The following factors shall be taken into account while selecting the ratings and interlock schemes for the GCB: • Synchronizing requirements of the generator • Transferred surges from HV side of generator transformer. • Load rejection from full load and rated power factor and house load operation while isolated

from grid i.e. with the generator transformer EHV breaker in open position. • Connecting and disconnecting the generator from the system under out-of phase

conditions. • Interrupting load and fault currents from network / auxiliary system and generator sources • Connecting the generator to the system under fault conditions i.e. switching on to fault. • Design ambient temperature.

4.16.0 During normal condition, when grid power is available, the generator shall be started with GCB in open position and synchronizing shall be done at the GCB. However, during grid disturbance, generator shall be running with GCB in closed position on house load (generator transformer EHV breaker in open position) and subsequently, generator shall be synchronized with grid through EHV breaker. Necessary scheme and interlocks shall be provided in GCB.

4.17.0 The contractor shall submit calculations indicating continuous current rating, short circuit breaking current, DC component of breaking current, making current etc. of GCB for approval. The calculations shall be based on IEEE C37.013.

4.18.0 The GCB shall be based on IEEE C37.013 which shall be tested with a test circuit time constant of 133 milli-second based on which the peak and asymmetrical break short circuit multiplying factors shall apply:-

• ½ cycle (10 milli-second at 50 Hz) peak making short circuit current duty shall be 2.7 times the GCB symmetrical ac short circuit rms current rating

• 50 milli-second break short circuit current duty shall be 1.39 times the GCB symmetrical ac short circuit rms current rating

4.19.0 The GCB with its main contacts open and insulating gas at atmospheric pressure must be capable of withstanding an out-of-phase voltage across the terminals with the phase angle between two voltages varying continuously. This shall be in line with the requirements given in the IEEE standard C37.013

4.20.0 SF6 circuit-breakers shall not incorporate components which are liable to deterioration or likely to create undesirable chemical action when in contact with the by-products of arcing or other substances likely to be encountered under service conditions. Precautions to minimise the presence of moisture and SF6 decomposition products shall be incorporated.

4.21.0 Static and moving gas seals shall be designed to prevent the leakage of gas or ingress of moisture throughout the service life of the interrupting module.

4.22.0 The enclosure of the module shall be strong enough to withstand the internal pressures generated when switching and shall incorporate an over pressure relief device for safe discharge of any excess pressure that may arise in service.

4.23.0 Interrupters incorporating separate main and arcing contacts shall be arranged such that any re-ignitions or restrikes always occur in the arcing zone between the arcing contacts.

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

4.24.0 Where the design is such that leakage could cause gas pressure to fall below that at which the

specified insulating and interrupting capacities can be maintained, gas pressure monitoring devices shall be incorporated to provide an alarm and block operation.

4.25.0 GCB movement during short circuit shall be restricted so as to limit the stresses on GCB

support insulators within their capabilities. 4.26.0 Support structure shall be designed to withstand the dynamic as well as static load of the GCB. 4.27.0 The circuit breakers shall be designed for natural air cooling in general. Where forced cooling is

adopted, it shall be subject to Owner’s approval. For forced cooling arrangement, 2X100% rated cooling fans shall be provided.

4.28.0 In place of active cooling (e.g.forced air cooling), passive cooling by means of a heat pipe cooling system can be offered, provided the cooling system is proven one and is in successful operation for the past three years. Details of passive cooling method shall be furnished along with the offer.

5.0.0 CONSTRUCTION REQUIREMENTS 5.1.0 GCB shall be SF6 type, metal-clad design having electrically operated circuit breakers. SF6 gas

shall be used both as its arc-extinguishing medium as well as for internal insulation. It shall be provided with three pole gang operation and anti-pumping feature.

5.2.0 GCB shall be provided in single phase enclosures, all fully assembled on a common frame with operating mechanisms, supervisory and control equipment.

5.3.0 GCB shall be installed indoor in the turbine building and connected to Generator busduct (Isolated Phase) on both sides. GCB shall be placed such that it is in line with the isolated phase bus duct (IPBD) to / from generator and generator transformer.

5.4.0 Connections to the generator phase bus ducts shall be adaptable and removable by means of flexible copper braid or laminated conductors with bolted fixings and all necessary equipment and accessories for the connections including flexible, bolted joints, plate adapters, etc. shall be supplied.

5.5.0 GCB enclosure shall be non-magnetic aluminium alloy, minimum flux, and isolated phase type with degree of protection IP-55.

5.6.0 The phase spacing shall be selected to suit the generator busduct spacing.

5.7.0 The current path of the system shall be connected to the busbar current path by bolted flexible, laminated or stranded connectors. In order to avoid detrimental tensile stresses to the terminals, resulting from electro-dynamic forces of a short-circuit current; the flexible connectors must be supported adequately.

5.8.0 The phase enclosures shall be designed to carry the induced reverse current, flowing through the isolated phase busbar enclosures. Thus the external magnetic field and its influence to the equipment shall be minimised. The phase enclosure shall be welded onto the busbar enclosure, ensuring continuity of the phase enclosure characteristics. In order to avoid pollution due to ingress of dust and/or moisture, the phase enclosures shall be made airtight to withstand also a small internal overpressure.

5.9.0 Windows shall be provided in the phase enclosures near to the disconnector and earthing switches to allow visually checking of the position of each of them.

5.10.0 Insulators shall be of high strength, fine glazed porcelain or epoxy resin type.

5.11.0 As the breaking capacity of an SF6 circuit-breaker and the dielectric withstand level across its open contacts is dependent upon the density of the SF6-gas, it shall be monitored. The density of the gas in the circuit-breaker chamber shall be compared with the density of the gas in a sealed reference gas volume.

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

5.12.0 When the gas density drops below the specified value, the density monitor shall signal the loss

of SF6-gas in several steps. SF6 gas monitor for each phase shall be provided. Necessary interlocks are to be arranged to prevent breaker operation on fall of SF6 gas density. SF6 density monitoring, alarm on low density and close & Trip blocking on very low density shall be provided. SF6 gas lockout logic shall be fail safe.

5.13.0 Disconnectors a) The generator circuit-breaker shall be fitted with an off-load series disconnector to permit

maintenance of the generator circuit when the generator transformer / Unit transformer / station transformer circuits are energised.

b) The line disconnector shall be of a telescopic unit type with a sliding tubular contact, with its hinged point on the transformer side and with an operating mechanism that operates through a mechanical linkage of all three poles. The isolating gap of the disconnector shall be in air at atmospheric pressure and a window shall be provided in the GCB enclosure to allow visual checking of its position.

c) The disconnector operating mechanism, operated by a 3-phase motor, shall be of a heavy-duty construction type and shall be designed to complete its normal travel to either ”open" or ”close" position, once started, without holding the control switch continuously in that position. It means that stopping the travel between fully open and closed position is not acceptable.

d) Interlocking shall be available to allow different operation modes to be selected. Mechanically driven semaphore shall be provided for signaling close / open-position. A crank handle shall be provided for manual operation in case of emergency.

e) The operating mechanism shall be independent of the circuit-breaker and earthing switch operating mechanisms and in addition to the normal local electrical open / close control facilities the mechanism shall also be provided with manual operation facilities for emergency and maintenance purposes. Mechanical open/closed status indications shall also be provided.

f) The disconnector shall be interlocked such that it cannot be opened or closed unless the circuit-breaker is open and viewing windows shall be provided in the equipment enclosures to facilitate direct observation of the disconnector position and confirmation of the isolating distance.

5.14.0 Earth switch

a) Earthing switches shall be fitted on both sides of the circuit-breaker to permit maintenance

of both the generator circuit and/or the generator transformer and Unit transformer / station transformer circuits.

b) The GCB earth switches shall be of blade type, air insulated, gang operated with motor drive, with their hinged point connected to earth and shall be integrated together with the GCB and disconnector into each of the single phase tubular aluminum enclosure, forming a straight section in the run of the isolated phase bus. The earth switches shall be peak fault making type with suitable peak fault making duty.

c) The earthing switches operation shall be interlocked with the GCB and disconnector.

d) The control of the earthing switches including the interlocking circuits shall be accommodated in the GCB system control cubicle. A local / remote switch and push-buttons for local control shall be provided.

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

e) The GCB earth switch operating mechanism, operated by a 3-phase motor, shall be of a heavy-duty construction type and shall be designed to complete its normal travel to either “open" or “close" position, once started, without holding the control switch continuously in that position. Stopping the travel between fully open and closed position is not acceptable.

f) Interlocking system shall be provided to allow different modes of operation to be selected. Mechanically driven semaphore shall be provided for signaling close/open position. A crank handle shall be provided for manual operation in case of emergency.

g) The operating mechanism shall be independent of the circuit-breaker and disconnector operating mechanisms and in addition to the normal local electrical open/close control facilities the mechanism shall also be provided with manual operation facilities for emergency and maintenance purposes. Mechanical open/closed status indications shall also be provided.

h) The earthing switches shall be interlocked such that they cannot be opened or closed unless the circuit-breaker and its disconnector are open and viewing windows shall be provided in the equipment enclosures to facilitate direct observation of the earth switch position. Interlocking shall also be provided to prevent the operation of the earthing switches unless the relevant remote switching devices are open (disconnectors) or withdrawn into the test position (circuit-breakers).

5.15.0 Short circuiting switch

a) Electrically operated short-circuiting switch shall be provided. The short-circuiting switch shall be provided between the circuit-breaker and the disconnector of the system on generator side. The short-circuiting switch and its connection between phases shall be developed to expedite the testing and adjustment of the plant protection system.

b) Closure of the switch shall establish an unearthed three phase short-circuit, which then can

be switched to the generator terminals by closure of the circuit-breaker. The closing of the earthing switch shall be motor operated (local/remote switch in position local) while the generator shall be de-excited.

5.16.0 Surge capacitor and Surge arrester

a) Heavy duty class gapless metal oxide surge arrester shall be provided on each phase on

each side of the GCB inside the enclosure. The surge arrestor and rate of rise limiting RC surge suppressor shall provide protection against over voltages for both the generator and the connected transformers.

b) Arrester shall be heavy duty with low protection level offering high protection margins suitable for operation in high resistance ineffectively/unearthed system and shall be pollution resistant, maintenance free with stable characteristic suitable for operation without thermal breakdown in the GCB enclosure panel under specified ambient conditions.

c) The surge arrester shall be suitable for maximum system voltage specified with transient over voltage due to earth fault for up to 10 second withstand.

d) Creepage and energy discharge capability shall be sufficient to withstand the environment conditions specified and the high site ambient temperatures at which the switchgear shall be suitable for operation.

e) The nominal discharge current shall be based on the maximum surge discharge conditions during maximum surge voltage.

f) The surge capacitors shall be of a metal-housed type and use synthetic aromatic oil as dielectric. The surge capacitors shall be mounted on the generator side and transformer

Manually

GT side

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

side in each phase of the GCB system unit to provide additional protection for the equipment connected to the generator bus bar against over voltages and to limit the rate-of-rise of the transient recovery voltage.

5.17.0 Current transformer

a) The current transformers shall be of a single-phase ring core type and shall be fitted at one or both ends of the GCB enclosure. The CTs shall be accessible through the removable top cover of the GCB enclosure. The secondary windings shall be wired to terminal blocks in the GCB control cubicle.

b) The current transformers shall have a basic impulse level and a power frequency withstand level as specified for the system.

c) The current transformers shall have the following accuracies: • Metering Class 0.2S • Over-current & earth fault protection Class 5P • Differential protection Class PS

d) The rated output shall match the requirements of the equipment connected. CT shall be rated for 120% of the full load rating. The secondary current rating shall be 1 A or 5 A as per protection requirement.

e) Facilities shall be provided which allow primary injection testing of the current transformers with the minimum disturbance to the GCB.

5.18.0 Voltage transformer

a) Single-phase Voltage transformers (VTs) as required for electrical protection, metering and measuring, synchronization and ferro-resonance protection shall be provided.

b) The GCB voltage transformers shall be of a single-phase ring core type and shall be fitted at one or both ends of the GCB system enclosure.

c) Secondary windings of voltage transformers shall be electrically protected. The voltage transformers could be provided with two or three (3) secondary windings as required.

d) The VTs shall be accessible through the removable top cover of the GCB system unit enclosures. The secondary windings shall be wired to terminal blocks in the GCB control cubicle.

e) The VTs shall have a basic impulse level and a power frequency withstand level as specified for the system.

f) The voltage transformer secondary circuits shall be complete themselves and shall be earthed at one point only. A separate earth link shall be provided for each secondary winding and shall be situated at the transformer but earthing shall be in the relay or control building. The primary winding shall be earthed at the transformer.

g) The VTs shall have primary fuses.

h) The preferred secondary voltage shall be 110 V. VTs shall be so designed that saturation

of the VT cores does not occur when √3 times normal voltage is applied to each winding. In this respect the rated voltage factor for the VTs, shall be selected dependent on the system earthing.

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Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

i) Voltage Transformers (VT) for different functions shall have following accuracy class.

• For tariff metering, accuracy class shall be class 0.2

• For general instruments / Measuring, accuracy class shall be class 0.5.

• For protection, accuracy class shall be class 3P.

j) Protection VT shall be provided with an additional open delta secondary winding, for the circuit neutral point displacement protection. These VT shall be of 3 phase winding with 5 limbed core or alternatively shall be based on 3 single phase winding VT. The Broken delta winding shall be loaded with ferro-resonance damping resistor for VT on the transformer side of the GCB.

k) One side of the low voltage winding of single phase voltage transformers and the star point

of three phase voltage transformers shall be earthed via an earthing link.

5.19.0 Operating Mechanism

a) The circuit-breaker operating mechanism shall be of the stored energy type, and shall have a capacity which is sufficient to perform an open-close-open (O-C-O) duty without replenishment from any external source. No closing operation shall be possible without sufficient stored energy in the mechanism to open the circuit breaker again. The operating/drive mechanism shall be trip-free as defined in IEC/IS standards and shall have anti-pumping features. Circuit-breaker operating mechanisms shall be 3 pole gang operated

b) The electrical motor operated spring charge mechanism shall be provided for the GCB, complete with all control equipment. .

c) Electrical as well as mechanical lock-outs shall be incorporated in each circuit-breaker to prevent operation whenever gas pressure or driving mechanism spring pressure, etc. are less than the set values for satisfactory operation of the circuit breaker or in case of any endangering irregularity. An alarm feature for local and remote indication of falling gas pressure shall be incorporated. SF6 gas lockout logic shall be fail safe.

d) A direct acting mechanical trip via an emergency push button shall be provided on each circuit-breaker.

e) Mechanically operated indicator shall be provided to show whether the circuit-breaker is open or closed. The position and gas pressure indicators shall be easily visible from the operator standing location. Mechanical or electrical operation counters shall be provided with all operating mechanism.

5.20.0 Interlocking

a) Circuit-breakers, disconnectors and earthing switches shall be provided with an approved interlocking system which shall ensure safe operation for personnel and equipment under all service conditions.

b) Electrical interlocks shall be hard wired fail safe design and shall function so as to interrupt the operating supply and shall also include for emergency hand operation.

c) Failure of the electrical supply or its restoration shall not produce or permit faulty operation.

d) Mechanical interlocks shall be provided between disconnectors and associated earthing switches to prevent coincident closure.

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e) Under normal operating conditions and when selected for remote operation the circuit-breakers shall be closed by their respective synchronising systems and electrical interlocks shall be provided to prevent the closing of circuit-breakers on to live connections unless the incoming and running voltages are equal and in synchronism.

f) Interlocking shall also be provided such that except under maintenance conditions, it shall not be possible to close the circuit-breaker unless the respective series disconnector and HV circuit-breaker are closed.

g) Simultaneous operation from local and remote shall be prevented by the provision of a Local/Off/Remote Selector Switch key operated with the key withdrawable in the remote position only. Except for the circuit-breaker all other equipment shall be operated locally.

h) A system of hard wired safety interlocks shall be provided by means of auxiliary contacts on all necessary remote equipment so as to prevent

• Closing of disconnectors unless all relevant earthing switches are open • Closing of earthing switches unless all relevant disconnectors are open and all relevant

HV and LV circuit-breakers withdrawn into the test position.

Back reporting contacts for the status of the circuit-breaker, disconnectors and earthing switches shall be provided so as to enable the interlocking of the remote equipment. In other words, the interlocking philosophy implemented shall be a visible break fail safe interlocking philosophy throughout.

i) To address situations where the power supply for motorised devices is not available a separate key interlocking system shall be provided to facilitate the local emergency manual operation of each item of equipment together with a key diagram and operating chart which shall be mounted on the front of the local control kiosk.

5.21.0 GCB Control Cubicle features

a) The GCB control cubicle shall be of sheet enclosed dust and vermin proof simplex type. The enclosure shall be made out of aluminium alloy / cold rolled sheet steel of 2 mm thick. The panel enclosure shall provide a degree of protection not less than IP55. All doors and openings shall be provided with neoprene gaskets.

b) The cubicle shall be suitable to be installed on base frame supplied in one piece along with foundation bolts. Adequate holes shall be provided at the bottom of all the panels for their installation on base frame. Anti-vibration pad of 25 mm thick shall be provided between base frame and panel through its entire width on the front/rear side.

a) All control and supervisory apparatuses shall be mounted in the control cubicle. The following control and indicating facilities shall be provided as a minimum:

• A local mimic with the electrical single line GCB diagram of the system. • Local - Off - Remote key operated selector switch. • Local electrical opening and closing facilities. • Remote electrical opening and closing facilities via interposing relays. • Mechanical open and closed indication facilities. • DC close and trip coils and an additional D.C. trip coil per pole. • Gas pressure meter for each SF6 filled compartment • Operations counter. • Alarm table with first up facility. • Lamp test push-button. • Indications • Alarms

2 X 660 MW Udangudi Supercritical Thermal Power Project - Stage - 1

Tender Enquiry Document for EPC Contract

Spec. No. SE/C/UP/EE/E/OT No.01/2015-16 FICHTNER INDIA Vol. II, Section 3 Page : 129 of 353

Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

6.0.0 PAINTING

Painting shall be carried out by approved process. After preparation of the under surface, all the equipment shall be painted with epoxy based paint by powder coating. The final thickness of paint film shall not be less than 85 microns. Final shade shall be RAL-7035. Support structures shall be hot dip galvanized.

7.0.0 TESTS 7.1.0 All the equipment supplied shall be of type tested quality. The performance of the generator

circuit-breaker system should have been fully tested in accordance to the standard IEEE C37.013 with regard to the interrupting capability.

7.2.0 Further type tests should have been carried out with all of the related components within the system to prove continuous current capability, dielectric strength, long term endurance, noise level etc. and verify the liability and compliance with the requirements of the relevant IEC-standards. Type test reports for the following shall be submitted for review by the Owner.

a. Rated dielectric strength tests

(i) Rated low frequency withstand voltage dry test. (ii) Rated full wave impulse withstand voltage test.

b. Short circuit rating and transient recovery voltage tests (i) Test for rated symmetrical short circuit current interrupting capability, duty cycle and rated transient recovery voltage parameters. (ii) Test for rated closing, latching and short time current carrying capability. (iii) Test for rated Generator source asymmetrical short circuit interrupting capability.

c. Load current switching test d. Out of phase switching current tests e. Rated excitation current switching tests. f. Type tests and oscillographic test records for closing and tripping timings for generator

circuit breaker of the rating offered. g. Rated continuous current carrying tests h. Mechanical endurance life tests. i. Noise level tests.

7.3.0 All acceptable & routine tests as per IEC-60056 and IEEE C37.013a-2007 standards shall be

conducted on all the equipment/components of each of the generator circuit breaker. The tests shall include the following: a) Design and visual checks b) Dielectric tests on the main circuit c) Dielectric tests on auxiliary and control circuits d) Measurements of the resistance of the main circuit e) Mechanical operation tests f) Timing tests and recording the switching times and movement of breaker contacts g) Functional tests of individual components h) Leakage test of phase enclosures i) SF6-gas leakage test.

7.4.0 Site tests

All site tests shall be carried out to prove the circuit breaker installation and integrity. Site tests shall be carried out in accordance with IEEE C37.013. The tests shall include the following: a) Leakage tests b) Gauge tests c) Stored energy system tests d) Electrical resistance of current path tests (circuit breaker and isolator) e) Clearance and mechanical adjustment check tests

2 X 660 MW Udangudi Supercritical Thermal Power Project - Stage - 1

Tender Enquiry Document for EPC Contract

Spec. No. SE/C/UP/EE/E/OT No.01/2015-16 FICHTNER INDIA Vol. II, Section 3 Page : 130 of 353

Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

f) Timing tests (using each trip coil separately) g) Normal frequency withstand voltage withstand tests. h) Functional tests of circuit breaker and isolator / earth switch including checks of interlocks,

indications etc. i) Ratio and polarity checks for VTs

8.0.0 GCB TECHNICAL PARAMETERS

Sl. No. Description Unit Data

1.0 General

a) Material of enclosure for GCB Aluminium alloy

b) Degree of Protection of the enclosure IP 55

c) Material of enclosure for control cubicle Aluminium alloy

d) Rated Lighting Impulse Withstand Voltage to

earth, between poles and across open

switching device

kV, peak 170

e) Rated One(1) minute power-frequency

Withstand voltage to earth, between poles

and across open switching device

kV, sym,

rms 70

2.0 GENERATOR CIRCUIT BREAKER

a) Applied Standard IEEE 37.013

b) Rated short circuit withstand time Sec 3

c) Interrupting media SF6

d)

Rated Operating Sequence

CO-30 min-CO (Short Circuit duty)

O-3min-CO-3min-CO (Load current duty)

e) Interrupting Time m. Sec � 50

f) Closing Time m. Sec � 100

g) No.of trip coil 2

h) Mechanism

Hydraulic Spring, 3pole gang operated

i) Type of Cooling Natural

3.0 DISCONNECTING SWITCH

a) Type Tubular Telescopic Unit

b) Applied Standard IEC 62271-102

c) Rated short circuit withstand time Sec 3

d) Operating Method

Three pole ganged motor operated

4.0 EARTHING SWITCH

a) Type

Blade type with the hinge point connected to the enclosure

As per IEEE C37.013

Hydraulic -spring /spring - springtype, 3 pole gang operated

As per IEC/IEEE62271-37-013

As per IEC/IEEE62271-37-013

IEC/IEEE 62271-37-013

As per IEC/IEEE 62271-37-013

Na ral/ForcedNatural/Forced

2 X 660 MW Udangudi Supercritical Thermal Power Project - Stage - 1

Tender Enquiry Document for EPC Contract

Spec. No. SE/C/UP/EE/E/OT No.01/2015-16 FICHTNER INDIA Vol. II, Section 3 Page : 131 of 353

Vol-II Section 3 Electrical_R0 Detailed Technical Specification - Electrical

Sl. No. Description Unit Data

b) Applied Standard IEC 62271-102

c) Rated short circuit withstand time Sec 3

d) Operating Method Motorized

6.0 VOLTAGE TRANSFORMERS

a) Service Inside GCB enclosure

b) Applied Standard IEC 61869

c) Insulation epoxy resin insulation, Class F

7.0 SURGE ARRESTOR

a) Service Transformer Side

b) Applied Standard IEC 60099-4

c) Rated discharge current (Wave 8/20 �s) kA 20 kA peak

d) Mounting Details Inside enclosure , transformer side

8.0 SURGE CAPACITOR

a) Applied Standard IEC 60358

b) Mounting Details Inside GCB Enclosure

9.0.0 DRAWINGS & DOCUMENTS

The following drawings and documents shall be submitted for approval during detail engineering stage.

• Technical data sheet • Equipment layout of GCB • General arrangement and section drawing of GCB • General arrangement and section drawing of local control cubicle • Single line diagram & Schematic wiring diagrams • Sizing Calculation for GCB • GCB cooling method • Short circuit withstand calculation for GCB (Thermal & dynamic) • Design calculation for support structure • Foundation Plan & loading details • Catalogues / drawings / leaflets for all items • Erection and commissioning procedures • Operation and maintenance manual • Test reports • Sub-vendor list • Manufacturing quality plan • Field quality plan

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