Technical Specification for11kV Breaker - … Specification for11kV... · and operation. The circuit breakers to be ... ( APDRP Scheme ) -10 - 6. CIRCUIT BREAKER ... control while

WESTERN ELECTRICITY SUPPLY COMPANY OF ORISSA WESCO ( APDRP Scheme)

- 1 -

Technical Specification for 11 kV Outdoor Circuit Breaker

WESTERN ELECTRICITY SUPPLY COMPANY OF ORISSA WESCO ( APDRP Scheme )

- 1 -

TABLE OF CONTENTS

PART 1: GENERAL

1. SCOPE ..............................................................................................................................................................4 2. STANDARDS ....................................................................................................................................................5 3. SERVICE CONDITIONS..................................................................................................................................6 4. SYSTEM CONDITIONS..................................................................................................................................7 5. BASIC TECHNICAL REQUIREMENTS............................................................................................................9 6. CIRCUIT BREAKER ...................................................................................................................................... 10

6.1. General..................................................................................................................................................... 10 6.2. Porcelain insulator.................................................................................................................................... 10 6.3. Interrupting media .................................................................................................................................... 10

6.3.1. Vacuum ............................................................................................................................................... 10 6.4. Auxiliary contacts .................................................................................................................................... 10 6.5. Indication .................................................................................................................................................. 10 6.6. Operation and controls............................................................................................................................. 11

7. CURRENT TRANSFORMERS........................................................................................................................... 11 7.1. Core.......................................................................................................................................................... 11 7.2. Windings................................................................................................................................................... 11 7.3. Construction ............................................................................................................................................. 12 7.4. Hermetic sealing ...................................................................................................................................... 12 7.5. Insulating oil ............................................................................................................................................. 12 7.6. Fittings and accessories .......................................................................................................................... 12 7.7. Hollow porcelain insulators ...................................................................................................................... 13 7.8. Insulation level ......................................................................................................................................... 13 7.9. Terminal connections............................................................................................................................... 13 7.10. Basic technical requirement..................................................................................................................... 14 7.11. Tests and inspections .............................................................................................................................. 14

7.11.1. Type tests: ...................................................................................................................................... 14 7.11.2. Routine tests:.................................................................................................................................. 15

8. POTENTIAL TRANSFORMERS.................................................................................................................... 16 8.1. BASIC TECHNICAL REQUIREMENTS .................................................................................................. 16

8.2 GENERAL ................................................................................................................................................ 17 8.3. Duty requirement...................................................................................................................................... 17


- 2 -

8.4. PORCELAIN INSULATOR....................................................................................................................... 17 8.5. CORE ....................................................................................................................................................... 17

8.6. WINDINGS ............................................................................................................................................... 17 Type tests: ............................................................................................................................................................... 20 Routine tests: .......................................................................................................................................................... 20

9. OTHER EQUIPMENT ................................................................................................................................... 21 9.1. Supporting structure................................................................................................................................. 21 9.2. CT and mounting bracket......................................................................................................................... 21 9.3. Local control cabinet ................................................................................................................................ 21 9.4. Panel wiring and accessories .................................................................................................................. 22

9.4.1. Fuse protection.................................................................................................................................... 22 9.4.2. Terminal blocks ................................................................................................................................... 22 9.4.3. Colours ................................................................................................................................................ 22

9.5. Circuit diagram ......................................................................................................................................... 22 9.6. Cable entry ............................................................................................................................................... 22

10. OPERATING MECHANISM........................................................................................................................... 22 10.1. General..................................................................................................................................................... 22 10.2. Spring mechanism ................................................................................................................................... 23 10.3. Motor ........................................................................................................................................................ 23

11. AUXILIARY POWER SUPPLY ...................................................................................................................... 23 12. INTERLOCKS ................................................................................................................................................ 23 13. PROTECTION AND METERING................................................................................................................... 23 14. TERMINAL CONNECTOR............................................................................................................................ 23 15. INSULATION AND CLEARANCES ............................................................................................................... 23 16. TEMPERATURE RISE.................................................................................................................................. 23 17. TESTS ............................................................................................................................................................ 23

17.1. Type and routine tests ............................................................................................................................. 23 17.2. Short circuit tests...................................................................................................................................... 23 17.3. Capacitive current switching .................................................................................................................... 23 17.4. Dielectric tests .......................................................................................................................................... 23 17.5. Mechanical endurance............................................................................................................................. 23 17.6. Low current switching .............................................................................................................................. 23 17.7. Duty requirement tests............................................................................................................................. 23 17.8. Temperature rise test .............................................................................................................................. 23

18. PERFORMANCE REQUIREMENTS............................................................................................................. 23 19. EARTHING..................................................................................................................................................... 23 20. OPERATIONAL TRAINING ........................................................................................................................... 23 21. COMPLIANCE WITH SPECIFICATION ........................................................................................................ 23


- 3 -

22. COMPLIANCE WITH REGULATIONS.......................................................................................................... 23 23. QUALITY ASSURANCE, INSPECTION AND TESTING .............................................................................. 23

23.1. General..................................................................................................................................................... 23 23.2. Quality Assurance programme ................................................................................................................ 23 23.3. Quality plans............................................................................................................................................. 23 23.4. Non-conforming product .......................................................................................................................... 23 23.5. Sub-suppliers ........................................................................................................................................... 23 23.6. Inspection and testing .............................................................................................................................. 23 23.7. Guarantee ................................................................................................................................................ 23

24. PROGRESS REPORTING ............................................................................................................................ 23 25. SPARE PARTS AND SPECIAL TOOLS........................................................................................................ 23 26. PACKING AND SHIPPING ............................................................................................................................ 23

26.1. Packing..................................................................................................................................................... 23 26.2. Shipping ................................................................................................................................................... 23 26.3. Hazardous substances ............................................................................................................................ 23

27. SUBMITTALS................................................................................................................................................. 23 27.1. Submittals required with the bid............................................................................................................... 23 27.2. Submittals required after contract award................................................................................................. 23

27.2.1. Programmes ................................................................................................................................... 23 27.2.2. Technical particulars ...................................................................................................................... 23 27.2.3. Operation and maintenance instructions ....................................................................................... 23

27.3. Drawings .................................................................................................................................................. 23 28. APPROVAL PROCEDURE............................................................................................................................ 23 29. SURFACE TREATMENT............................................................................................................................... 23

29.1. Painting .................................................................................................................................................... 23 29.2. Galvanising............................................................................................................................................... 23

30. FASTENERS.................................................................................................................................................. 23 31. COMPLETENESS OF CONTRACT .............................................................................................................. 23 32. PADLOCKS.................................................................................................................................................... 23 33. LABELS .......................................................................................................................................................... 23 34. TECHNICAL DATA SCHEDULE ................................................................................................................... 23

RELAYS.............................................................................................................................................................. 23 Powewr Packs ............................................................................................................................................................. 23 35. NON COMPLIANCE SCHEDULE.................................................................................................................. 23 36. TEST CERTIFICATES SCHEDULE .............................................................................................................. 23


- 4 -

PART 1: GENERAL

1. SCOPE

This specification covers design, engineering, manufacture, testing, delivery, off-loading to the specified destinations and performance requirement of 11 kV Outdoor Vacuum Circuit Breakers (VCB) for use in primary substations and 11 kV network under WESCO . The circuit breakers shall be suitable for 3 phases; 50 Hz solidly grounded neutral system and shall have normal current carrying capacity of 800 amps. and symmetrical short circuit current breaking capability of 12.5 kA. The offered circuit breakers shall have been type tested within last 5 years as on the date of bid opening and in satisfactory operation for a period of not less than two years. The bidder shall demonstrate compliance with this requirement by supplying with the bid, copies of the type test certificates together with acceptance certificates from purchasers. The scope also includes the circuit breaker and current & potential transformer supporting structures, current transformers, potential transformers, operating mechanism, local control cabinet, relay control panel, foundation bolts, all the accessories and auxiliary equipment, mandatory spares and special tools for satisfactory installation and operation. The circuit breakers to be supplied against this specification shall be required to control the secondary side of 33 / 11 kV power transformers in new primary substations or as additional equipment in existing primary substations.

The circuit breakers shall conform in all respects to highest standards of engineering, design, workmanship, this specification and the latest revisions of relevant standards at the time of offer and the Purchaser shall have the power to reject any work or material, which, in his judgement, is not in full accordance therewith.


- 5 -

2. STANDARDS Except where modified by this specification, the circuit breakers and the accessories shall be designed, manufactured and tested in accordance with latest editions of the following standards.

IEC/ISO/BS IS Subject IEC: 56 IEC: 694 IEC: 60 IEC: 427 IEC:1233 IEC: 17A / CD/474 IEC: 529 IEC: 376 IEC: 137 IEC: 233 IEC: 273 IEC: 815 IEC: 34 ISO:1460 BS : 729 IEC: 227 IEC: 269 ISO: 800 IEC: 185 IEC: 296 IEC: 186

IS: 13118 IS: 12729 IS: 9135 IS: 13516 IS: 13947 IS: 13072 IS: 2099 IS: 5621 IS: 5350 IS: 13134 IS: 996 IS: 2629, IS:2633 IS: 5 IS: 6005 IS: 1554 IS:13703 IS: 1300 IS: 2705 IS: 335 IS: 3156

High voltage AC circuit breakers, general requirement. Common clauses for high voltage switchgear and control gear standards (for voltages exceeding 1000 V). High voltage testing techniques. Method of synthetic testing of H.V.AC. circuit breakers. H.V.AC circuit breakers-inductive load switching. H.V.AC circuit breaker-capacitive switching. Degree of protection provided by enclosure. Specification and acceptance of sulphur hexa-fluoride. Insulating bushing for AC voltages above 1000 V. Hollow insulators for use in electrical equipment and testing. Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000 V. Guide for selection of insulators in respect of polluted conditions. A.C. motors. Hot dip galvanising. Method of testing uniformity on zinc coated article. Colour for ready mixed paints and enamels. Code of practice for phosphating of iron and steel. P.V.C. insulated cables for voltages up to and including 1100 Volt. HRC cartridge fuse links for voltages up to 650 Volts. Phenolic moulding material. Current transformers. Specification for unused insulating oil for transformer and switchgear. Potential Transformers

The bidder may propose alternative standards, provided it is demonstrated that they give a degree of quality and performance equivalent to or better than the referenced standards. Acceptability of any alternative standard is at the


- 6 -

discretion of the Purchaser. The bidder shall furnish a copy of the alternative standard proposed along with his bid. If the alternative standard is in a language other than English, an English translation shall be submitted with the standard. In case of conflict, the order of precedence shall be 1) IEC or ISO standards, 2) Indian standards and 3) other alternative standards. This list is not to be considered exhaustive and reference to a particular standard or recommendation in this specification does not relieve the Supplier of the necessity of providing the goods and services complying with other relevant standards or recommendations.

3. SERVICE CONDITIONS

The service conditions of the sites where the circuit breakers shall be used are as follows:

• Maximum altitude above mean sea level meter. 1000

• Maximum ambient air temperature. Deg.C. 50

• Maximum daily average ambient temperature Deg.C. 40

• Maximum temperature attainable by an object exposed to the sun. Deg.C. 60

• Maximum yearly weighted average ambient temp. Deg.C. 32

• Maximum relative humidity. Percent. 100

• Average number of thunder storms(isokeraunic level) days/annum 70

• Average number of rainy days days/annum 120

• Average annual rainfall. cm. 150

• Maximum wind pressure. kg/ m2 94.3


- 7 -

4. SYSTEM CONDITIONS

The equipment shall be suitable for installation in supply systems of the following characteristics:

• Frequency 50 Hz

• Nominal system voltages 33 kV

11 kV

400/230V

• Maximum system voltages 33 kV System 36 kV

11 kV System 12 kV

LV System 476/275 V

• Minimum LV voltage 340/196 V

• Nominal short circuit levels 33 kV System 25 kA

11 kV System 12.5 kA

• Insulation Levels to earth:

1.2/50 µs impulse withstand voltage

(positive and negative polarity)

33 kV System

170 kV

11 kV System 75 kV

• Power frequency one minute

withstand voltage (wet and dry)

33 kV System

70 kV

11 kV System 28 kV

LV System 2 kV

• Neutral earthing arrangements 33 kV System solidly earthed


- 8 -

11 kV System solidly earthed

LV System solidly earthed


- 9 -

PART 2: TECHNICAL

5. BASIC TECHNICAL REQUIREMENTS

The 11 kV outdoor circuit breakers are required to meet the following basic technical requirements: (Reference standards: IEC: 56, IS: 13118 and associated standards listed in clause 2, part 1)

Basic Technical Requirements

Particulars Requirement

1. No. of poles

2. Nominal system voltage

3. Highest system voltage

4. Rated normal current

5. Rated short circuit breaking current, rms

6. Rated short circuit making current, peak

7. Short time current withstand capability

8. Rated insulation level:

i) One minute power frequency withstand voltage to earth, (wet and dry ),rms

ii) Impulse withstand voltage to earth with

1.2/50 µs wave of +ve and -ve polarity, peak.

9. First-pole-to-clear factor

10. Rated operating sequence (for auto reclosing)

13. Maximum break time

14. Rated out of phase breaking current 15. Maximum pole scatter

3

11 kV

12kV

800 A

12.5 kA

31.25 kA

12.5 kA rms for 3 seconds

28 kV

75 kV

1.5

O-0.3 sec-CO-3 min-CO

4 cycles

25% of the symmetrical short circuit breaking current. 10 milli seconds.


- 10 -

6. CIRCUIT BREAKER

6.1. General

The circuit breakers shall be structure mounted open type with vacuum as interrupting media incorporating separate interrupters for each phase mounted on a single frame. There shall be a common drive mechanism actuating the interrupters, which must work in synchronism. These breakers shall be provided with suitable local control while provision shall be made for remote control. The circuit breakers shall be fitted with spring mechanism. The inherent design of these circuit breakers shall be such that they shall satisfactorily perform all test duties and interrupt out-of-phase current and produce very low over voltages (<2.0 pu) on all switching circuits, capacitive and inductive, to IEC: 56, IS: 13118 and other associated standards mentioned in clause two, part one. The terminal pads shall have silver-plating of at least 20-micron thickness. For aluminium terminal pads, which are not silver-plated, the bidder shall describe how low contact resistance is maintained throughout the lifetime of the circuit breaker. The design of the circuit breaker shall be such that inspection and replacement of contacts, coils, vacuum bottles and any worn or damaged components can be carried out quickly and with ease. The contact gaps shall be adjustable to allow for wear. The mechanism and the connected interrupters shall satisfy the mechanical endurance requirements of IEC: 56, IS: 13118 and all additional requirements specified herein.

6.2. Porcelain insulator

External parts of the circuit breakers, which are under continuous electrical stress, shall be of hollow porcelain. The creepage and flashover distances of the insulators shall be dimensioned and the type and profile designed in accordance with IEC: 815; IS: 13134 and shall be suitable for the worst environmental conditions specified in clause 3, part 1 of this specification. The creepage distance across the interrupting chambers shall suit the outdoor service conditions mentioned in the relevant standard for heavily polluted atmosphere and shall be not less than 380 mm. with protected creepage distance 50 percent of the total. Internal surfaces of hollow insulators shall also be glazed. The insulators shall comply with IS: 5621 and tested in accordance with IEC: 233. All porcelain whether used on the interrupting chamber or on the support insulator shall have the following properties: high strength, homogeneity, and uniform glaze, free from cavities and other flaws and high quality uniform finish. Porcelain components shall withstand the maximum expected static and dynamic loads to which the circuit breaker may be subjected during its service life.

6.3. Interrupting media 6.3.1. Vacuum In vacuum circuit breakers, facilities shall be provided for monitoring the contact erosion and any change in contact gap. The vacuum bottles shall be easily replaceable on site and the mechanism shall be conveniently adjustable to permit resetting the contact gap. The vacuum circuit breaker poles shall be sealed to prevent contamination of the spaces surrounding the interrupters. The Bidder shall demonstrate how this is achieved by supplying technical details with the bid.

6.4. Auxiliary contacts 10 auxiliary contacts (5 N.O. and 5 N.C.) of 24 Volt DC grade and 10 Amps DC rating shall be provided on each circuit breaker.

6.5. Indication A mechanically operated open and close position indicator of the circuit breaker shall be provided in a location visible from the operating side of the breaker without the necessity to open the mechanism door. It shall be made of non-corroding material. The word ‘OFF’ in white letters on green background shall be used to indicate that the breaker is in the open position. The word ‘ON’ in white letters on a red background shall indicate that the breaker is


- 11 -

in the closed position. The drive for the device shall be positive in both directions and provision shall be made for local and remote electrical indication. Indication of spring charging condition shall be provided as mentioned in clause 9.2. Mechanical counters to record the number of closing operations shall be provided for each circuit breaker mechanism.

6.6. Operation and controls The breaker shall normally be operated by remote electrical control with electrical tripping by shunt trip coil. Provision shall be made for local electrical operation and mechanical operation. The following facilities shall be provided in the circuit breaker local control cabinet:

• LOCAL / REMOTE selector switch of stay put type. The selection of ‘local’ operation shall inhibit the operation of the breaker from any remote source.

• ON /NEUTRAL/ OFF control switch or ON and OFF push buttons. The push buttons shall be momentary contact type with rear terminal connections. The close push button shall be of green colour and the open push button red colour.

• MECHANICAL EMERGENCY TRIP DEVICE : suitable for manual operation in the event of failure of electrical supplies. The device shall be accessible without opening any access doors and distinctly labelled, shrouded and protected against inadvertent operation.

• Means shall be provided for manual operation of these circuit breakers during failure of auxiliary power in addition to electrical operation.

Means shall be provided to prevent the mechanism from responding to a close signal when the trip coil is energised or to reclosing from a sustained close signal either after opening due to a trip signal or failure to hold in the closed position. The circuit breaker shall be able to perform 10,000 operating cycles at no load in accordance with IEC: 17A/ 474 / CD for circuit breakers for auto reclosing duties.

7. CURRENT TRANSFORMERS Current transformers, three per circuit breaker, shall be of outdoor, single phase type and shall comply with IEC: 185 and IS: 2705, suitable for operation in hot and humid atmospheric conditions described in service condition clause of this specification. Current transformers shall be oil immersed type or dry type fully type tested as per the latest applicable IEC and IS standards. Where the bidder offers a current transformer of the dry type, detailed information must be supplied with the bid listing the specific type resin or other insulating material used, tests which prove its suitability for outdoor service in the specified conditions, the period of time over which similar units have been supplied, quantity supplied and name of customer.

7.1. Core High-grade non-ageing cold rolled grain oriented silicone steel of low hysteresis loss and permeability shall be used for the cores so as to ensure accuracy at both normal and over currents. The flux density shall be limited to ensure that there is no saturation during normal service. The instrument security factor of the core shall be low enough so as not to cause damage to the instruments in the event of maximum short circuit current.

7.2. Windings The secondary windings shall be made of electrolytic copper with suitable insulation. The conductor shall be of adequate cross-section so as to limit the temperature rise even during short circuit conditions. The insulation of windings and connections shall be free from composition liable to soften, ooze, shrink or collapse during service.


- 12 -

Polarity shall be indelibly marked on each current transformer and at the lead and termination at associated terminal blocks. CTs with multi ratio windings shall be clearly tabulated to show the connections required for different ratios. Similar numbers shall be marked on terminal block arrangement and wiring diagrams. The continuous current rating of the primary windings shall be one hundred and fifty percent of the normal rated current. Secondary windings of current transformer shall be used for metering, instrumentation and protection and shall be rated for continuous current of one hundred and fifty percent of normal rated current.

7.3. Construction The current transformer enclosures shall be made of high quality steel and shall be able to withstand the stresses occurring during transportation and the thermal and mechanical stresses resulting from maximum short circuit current in service. The secondary connections shall be terminated in a terminal box mounted on the base plate.

7.4. Hermetic sealing Each current transformer shall be supplied filled with insulating oil complying with IEC: 296 and IS: 335 and shall be hermetically sealed to prevent atmosphere coming in contact with oil, avoiding frequent filtration and change of oil. Nitrogen or any oil inert gas above the oil level shall be provided to permit expansion and contraction of oil without any contact with the atmosphere. The current transformers shall have provision for draining and re-filling insulating oil after drying.

7.5. Insulating oil The current transformer shall be complete with new insulating oil. The quantity of insulating oil for first filling of each equipment and complete specification of oil proposed to be used shall be stated in the bid. The oil shall conform to the requirements of latest issue of IEC: 296 or IS: 335.

7.6. Fittings and accessories Fittings and accessories listed below shall be supplied with each CT:

• oil level gauge;

• oil filling hole and cap;

• pressure relief device;

• H.V. terminal connector;

• two earthing terminals and strips with necessary nuts, bolts and washers;

• name and rating plate;

• terminal box with LV terminal connections;

• mounting nuts, bolts and washers;

Any other fittings deemed essential by the Supplier shall also be supplied with each current transformer. The oil level gauge shall be mounted in such a way that the oil level can be clearly seen from ground level. A dust, vermin and weatherproof terminal box shall be provided at the lower end of the current transformer for terminating the secondary windings. The box shall have a bolted cover plate complete with gaskets. The terminal box shall have terminal blocks, cable gland plate and cable glands with shrouds suitable for two 6 x 2.5 sqmm PVC insulated and armoured control cables as per IEC: 227 or IS: 1554. The terminal blocks shall have covering of moulded insulation materials complete with brass studs, washers, nuts and lock nuts suitable for termination of 2 x 2.5 sqmm. wires. The termination shall be made by crimping lugs or bare wire with insulating sleeves at ends.


- 13 -

The terminal box enclosure shall have protection class IP 55 as defined in IEC: 529 or IS: 13947.

7.7. Hollow porcelain insulators The insulators of the current transformers shall conform to latest edition of IS: 5621 and tested in accordance with IEC: 233. The hollow porcelain insulators shall be brown glazed and shall meet the requirements indicated in clause 6.2 of this specification. The insulators shall be cemented to the flanges resulting in high mechanical, tensile and breaking strength.

7.8. Insulation level The current transformers shall be designed to withstand impulse test voltages and power frequency test voltages as specified in sub clause 7.10 of this specification.

7.9. Terminal connections The CTs shall be provided with bi-metallic solder less clamp and rigid type terminal connectors on the top tank for connection to the H.V. terminals. The other requirements shall be same as for the terminal connectors of the circuit breaker described in clause 13. They shall be universal type suitable for both horizontal and vertical connections. Two earthing terminals complete with necessary hardware shall be provided on each CT for connecting to earth continuity conductor to be provided as per clause 18. The earthing terminals shall be identified by means of appropriate symbol marked in a legible and indelible manner adjacent to the terminals. The terminals shall be adequately sized to meet the full earth fault current envisaged.


- 14 -

7.10. Basic technical requirement

Ratings: The CTs shall conform to the following ratings (two categories to be supplied as follows): Technical Requirements

Particulars Requirement.

Function To control the secondary side of 33/11 kV power transformers of ratings between 1.6 MVA & 8 MVA in primary substations

Requirement Core: 1 Instrumentation and Metering Core: 2 Combined Over current and Earth fault protection Core: 3 Differential protection

Transformation ratio. Category 1 Category 2

600-300-150/ 5-5-5A 400-200-100/ 5-5A

Rated burden(VA)

Core-1: 15 Core-2: 15 Core-3: PS (5P subject to the knee point voltage not less than specified below)

Core-1: 15 Core-2: 15

Class of accuracy. Core-1: .5 Core-2: 5 P10 Core-3: 20

Core-1 :.5 Core-2: 5 P10

Instrument security factor Core-1: 5 Core-1: 5

Accuracy limit factor Core-2: 10 Core-3: 20

Core-2: 10

Rated voltage 12 kV

Short time rating. 12.5 kA rms for 3 seconds

Creepage distance Protected creepage distance

380 mm. minimum minimum 50 percent of total

Insulation Level:

- Impulse voltage 1.2/50 µs wave withstand level - Power frequency one minute voltage withstand level

75 kV

28 kV

Excitation current at Vk / 2 Not more than 30 milli-amps.

7.11. Tests and inspections

The CTs shall be tested in accordance with the requirements of the type tests and routine tests as per the latest issues of IEC: 185 or IS: 2705. The tests to be conducted shall include:

7.11.1. Type tests:

• Lightning impulse voltage;

• Power frequency wet withstand voltage; • Temperature rise; • Short time current;


- 15 -

• Composite error; • Accuracy test (for measuring core); • Instrument security current (for measuring core); • Current error and phase displacement (for protection core). 7.11.2. Routine tests: • Verification of terminal marking and polarity; • Power frequency dry withstand test on primary windings; • Power frequency dry withstand test on secondary windings; • Power frequency dry withstand test between sections; • Over voltage inter-turn test; • Composite error; • Turn ratio; • Accuracy test (for measuring core); • Current error and phase displacement (for protection core); • Knee point voltage and excitation current (for PS class); • Secondary resistance (for PS class).


- 16 -

8. POTENTIAL TRANSFORMERS

8.1. BASIC TECHNICAL REQUIREMENTS The 11 kV outdoor voltage transformers are required to meet the following basic technical requirements (Reference standards: IEC: 186, IS: 3156 and associated standards listed in the specification):

Particulars Requirement

1. Type Single phase

2. Nominal system voltage, phase to phase 11 kV

3 Application Instrumentation and Metering

4. Number of secondary windings 1

5. Rated normal burden* 200 VA

6. Rated primary voltage 11 kV /√ 3

7. Rated secondary voltage 110 V /√ 3

8. Class of accuracy 1

9. Rated insulation level, phase to earth, primary:

• One minute power frequency

withstand voltage

28 kV

• Impulse withstand voltage with

1.2/50 µs wave of +ve and -ve polarity

75 kV

10. Power frequency withstand voltage of

secondary windings:

• between phase to earth 3 kV rms for one minute

• between sections 3 kV rms for one minute

11. Rated voltage factor

• continuous • for 30 seconds

1.2

1.5

12. Creepage distance to earth 25 mm per kV of highest phase to phase system voltage

* The burden indicated is the minimum acceptable to the Employer. The Contractor shall ensure that the rated output of the voltage transformers are adequate to meet at least 120 percent of the connected load (burden).


- 17 -

8.2 GENERAL The voltage transformers to be supplied under this specification shall be of outdoor, single phase, double wound, oil immersed type, complying with IEC: 185 and IS: 3156 suitable for operation in hot and humid atmospheric conditions described in clause three part one of this document. They shall have separate HV and LV windings and shall be suitable for use as bus VTs in 33/11 kV primary substations. Separate prices are to be quoted for the 33 kV and 11 kV voltage transformers.

8.3. Duty requirement 11 kV Voltage transformers: For all the indicating instruments and measuring meters in the primary substation on 11 kV side.

8.4. PORCELAIN INSULATOR

External parts of the voltage transformers which are under continuous electrical stress shall be of hollow porcelain insulators complying with latest edition of IS: 5621 tested as per IEC: 233. The creepage and flashover distances of the insulators shall be dimensioned and the type and profile designed in accordance with IEC: 815 or IS: 13134 and shall be suitable for the worst environmental conditions specified in this specification. The creepage distances to earth shall suit the outdoor service conditions mentioned in relevant standard for heavily polluted atmosphere and shall be not less than 25 mm per kV of highest phase to phase system voltage with protected creepage distance minimum 50 percent of the total. Internal surfaces of hollow insulators shall also be glazed. The insulators shall be cemented with Portland cement to the flanges resulting in high mechanical, tensile and breaking strength. All porcelain used on the voltage transformers shall have the following properties: high strength, homogeneity, uniform glaze, free from cavities and other flaws and a high quality uniform finish. Porcelain components shall withstand the maximum expected static and dynamic loads to which the voltage transformers may be subjected during their service life. The insulation of the hollow porcelain insulators shall be co-ordinated with that of the voltage transformers to ensure that any flash over occurs only externally.

8.5. CORE High grade non-ageing cold rolled grain oriented silicone steel of low hysteresis loss and permeability shall be used for core so as to ensure accuracy at both normal and or over voltages. The flux density shall be limited to 1.6 Tesla at normal voltage and frequency. There shall be no saturation at any stage during operation. The instrument security factor of the core shall be low enough so as not to cause damage to the instruments in the event of maximum short circuit current or overvoltages.

8.6. WINDINGS The primary and secondary windings shall be electrolytic copper of high purity and conductivity and covered with double paper insulation. The conductor shall be of adequate cross-section so as to limit the temperature rise even during maximum overvoltages. The insulation of windings and connections shall be free from composition liable to soften, ooze, shrink or collapse during service. The current rating of the primary winding shall be one hundred and fifty percent of the normal rated burden and the windings shall be suitable to withstand continuously the maximum system voltage. The secondary windings of the voltage transformers shall also be suitable for continuous overvoltages corresponding to the maximum system voltage at the primary winding. The winding supports shall be suitably reinforced to withstand normal handling and the thermal and dynamic stresses during operation without damage.


- 18 -

The voltage transformer secondary circuits will be taken out to form the star point and earthed at one point outside the voltage transformers. Both primary and secondary winding terminals shall be clearly and indelibly marked to show polarity in accordance with IEC: 186. The connections required for different secondary windings in case of multiwinding voltage transformers shall be clearly indicated in terminal blocks and the wiring diagrams. 8.7. TANK Both expansion chamber and tank of the voltage transformers shall be made of high quality steel and shall be able to withstand the stresses occurring during transit and all thermal and mechanical stresses resulting from maximum short circuit current during operation. The tank shall be painted in accordance with the clause titled Surface Treatment of this specification. 8.8. INSULATING OIL The voltage transformers shall be supplied filled with new insulating oil. The oil shall conform to the requirements of latest issue of IEC: 296 or IS: 335. The quantity of insulating oil for first filling of each equipment and complete specification of oil proposed to be used shall be stated in the bid. 8.9. HERMETIC SEALING The voltage transformers shall be supplied filled with insulating oil and shall be hermetically sealed to prevent atmosphere coming in contact with oil, avoiding filtration and change of oil. Nitrogen or other inert gas shall be provided above the oil surface to permit expansion and contraction of oil. Provision shall be made for draining and re-filling the insulating oil. 8.10. FITTINGS AND ACCESSORIES Fittings and accessories listed below shall be supplied with each voltage transformer: • oil level gauge; • oil drain, sampling and filling hole with cap; • pressure relief device; • H.V terminal; • two earthing terminals with necessary nuts, bolts and washers; • name and rating plate; • secondary terminal box with LV terminal connections; • mounting nuts, bolts and washers; • L.V. HRC cartridge fuses for the protection of secondary winding. Any other fitting deemed essential by the Contractor shall also be supplied along with each voltage transformer. The oil level gauge shall be mounted in such a way that the oil level can be clearly seen from ground level. The name and rating plate shall contain all the particulars as provided in IEC: 186 and also the name of the employer and year of manufacture. They shall comply with the clause termed Label in this specification. 8.11. SECONDARY TERMINAL BOX


- 19 -

A dust, vermin and weather proof terminal box shall be provided at the lower end of each voltage transformer for terminating the secondary windings. The box shall have a bolted removable cover plate complete with gaskets. The terminal box shall have cable gland plate and cable glands with shrouds suitable for entry of PVC insulated and armoured control cables as per IEC: 227 or IS: 1554 of following numbers and sizes. For 11 kV Voltage transformers: One 6 core 2.5 sq.mm.

The terminal box enclosure shall have protection of class IP 55 as defined in IEC: 529 or IS: 13947 and shall be painted or galvanised in accordance with the clause titled Surface Treatment of this specification.

8.12. Terminal blocks Terminal blocks of brass studs rated for 10 Amps continuous current, 650 Volt grade enclosed in moulded insulating materials shall be provided with adequate electrical clearances for terminating the secondary wiring and outgoing connections. The terminal blocks shall be suitable for termination of 2.5 sq. mm. wires. The termination shall be made by crimping lugs or bare wires with insulating sleeves at ends. All terminals must be marked with numbers and wire termination provided with numbered ferrules for identification. 8.13. Fuse protection The secondary windings shall be protected by HRC cartridge fuses in fuse holder consisting of carriers and bases. The carriers and bases shall be of high grade flame retarding and non hygroscopic moulded insulation materials with hard glass surface. Each fuse shall be identified with engraved plastic label. 8.14. Circuit diagram A durable copy of the circuit wiring diagram shall be affixed to the inner side of the terminal box cover. Labels shall be provided inside the cover to describe the functions of various items of equipment.

8.15. TERMINATION

The equipment shall be supplied with HV electrical connection terminals of a size and rating appropriate for all the duties, including overload duty specified for the equipment. The terminals shall be of the bi-metallic type, suitable for connection of all aluminium alloy conductor (AAAC) or aluminium conductor steel reinforced (ACSR). In general connections using palm type solderless sockets shall be preferred. The proposed method of connection shall be stated in the offer and shall be subject to approval by the Project Manager. Where the terminals are of the clamp type, they shall be suitable for taking a range of conductors appropriate to the rating of the equipment. All nuts, bolts, washers and spring washers required to complete the connection shall be supplied with the equipment. 8.16. EARTHING TERMINAL Two earthing terminals complete with necessary hardware shall be provided on each voltage transformer for connecting to earth continuity conductors of the Employer. They shall be of electroplated brass and of adequate size to carry the earth fault current. The earthing terminals shall be identified by means of appropriate symbol marked in a legible and indelible manner adjacent to the terminals. 8.17. TESTS AND INSPECTIONS The voltage transformers shall be tested in accordance with the requirements of the type tests and routine tests as provided in the latest issues of IEC: 186 or IS: 3516.


- 20 -

The tests to be conducted shall include:

Type tests: • Lightning impulse voltage test;

• High voltage power frequency wet withstand voltage;

• Temperature rise test;

• Short circuit withstand capability test;

• Determination of limits of voltage error and phase displacement.

Routine tests: • Verification of terminal marking and polarity;

• Power frequency withstand tests on primary winding;

• Power frequency dry withstand tests on secondary winding;

• Power frequency withstand tests between sections;

• Determination of limits of voltage errors and phase displacement;

• Partial discharge measurement. 8.18. TEMPERATURE RISE The temperature rise of any part of the voltage transformer under continuous operation and exposed in the direct rays of the sun shall not exceed the permissible limits as provided in IEC publication 186 or IS: 3156. These shall not be exceeded when corrected for the difference between the ambient temperature at site and the ambient temperature specified in the standard. The correction proposed shall be stated in the bid.

9. PROTECTIVE RELAY & CONTROL PANEL

Protective relays and metering will be provided in a control panel in Purchaser’s switch yard The equipment shall have protection scheme with the following relays: i) Tripple pole IDMTL type combined over current ( 2 No.s ) & Earth fault ( 1 No) relay ( Draw out type ) . Plug setting range of the over current relays shall be 50% to 200 % and that of the earth fault relay as 10 % to 40 % . ii) 6 element auxiliary relay for transformer fault alarm & trip for Buchholtz winding temperature & oil temperature . iii) Master trip relay for inter tripping:

Single pole restricted earth fault ( REF ) relay to trip both 33 KV & 11 KV incoming breakers with 11 KV neutral CT current setting range of the REF relay shall be 10 % to 40 % . The neutral CT is to be supplied with the equipment.

iv) One alarm bell scheme with bell: N.B.:- The relays should be EE / Euson Reyrolls make or any reputed make . Any deviation should be mentioned.


- 21 -

10. METERS:

The following meters will be provided. i) Ammeter :- 0- 300-600A – 1 No for Feeders & 0-200-400A for Transformers Preferable Make.- IMP /AE or any reputed make . ii) Volt meter 0- 15 K - 1 No Make IMP / AE or reputed make iii) MW meter (0–10 MW ) - 1 No Make IMP/ AE or reputed make. iv) Ammeter selector switch - 1 No Make – Kaycee v) Volt meter selector switch - 1 No. Make - Kaycee v) 3 Phase 3 wire power factor meter . - 1 No Make IMP/ AE or reputed make. vii) 40 watt lamp with switch- 1 No viii) Plug & socket. - 1 No. ix) Fuses & Links -1 No x) Test terminal Blocks - Test terminal Block need be provided for testing relays & breakers in test position. xii) Indication Lamp - Red- Breaker – ON Green – Breaker – OFF Amber – Breaker auto Trip Blue- spring charge indication White –Healthy Trip illuminated push button switch.

11. OTHER EQUIPMENT

11.1. Supporting structure The supply of the material shall be complete with mounting structures of mild steel sections conforming to IS: 226 or equivalent ISO. The supporting structure shall be designed and constructed to withstand the maximum combined effects of the circuit breaker dead weight, its maximum dynamic load and maximum effect of wind loading. The supporting structure shall be hot dip galvanised as per clause on surface treatment of this specification.

11.2. CT and mounting bracket The supporting structures shall be fitted with a bracket for supporting the three oil filled 11 kV single-phase current transformers. The support bracket shall be provided opposite the circuit breaker poles and shall ensure adequate clearance between the breaker poles and the CTs as well as between the CTs. The current transformers shall be supplied by the Supplier as per specification given in clause 7 above and is included in the scope. The drawings of the structures with brackets shall be subject to Purchaser’s approval before fabrication. The current transformer mounting brackets shall be hot dip galvanised as per clause on surface treatment of this specification.

11.3. Local control cabinet The operating mechanism, local controls and monitoring shall be provided in a metal clad control cabinet fitted to the same structure supporting the circuit breaker and mounted at a convenient height for safe operation from ground level or from a platform to be supplied under the contract.

The cabinet shall be made of minimum 2.00 mm sheet steel and shall be constructed as a dust, weather and vermin proof outdoor housing with protection as per IP-54 of IEC: 529 or IS: 13947. It shall have single door and transparent windows for reading the circuit breaker ON or OFF position and spring charge position without


- 22 -

requiring to open the door. The door and any removable covers shall be gasketed all round with neoprene-bonded gaskets. A ventilating louver shall be provided with fine wire non-ferrous metal or stainless steel screen and filter. A 230 V A.C. heater with auto temperature control shall be provided in the cabinet to prevent moisture condensation and also a 230 Volt lamp for internal illumination with door operated switch. The local control cabinet shall be subjected to surface treatment and painting as per clause on surface treatment of this specification.

11.4. Panel wiring and accessories

Panel wiring shall be suitably bunched and clamped for neat appearance. The conductor used for wiring purpose shall be PVC insulated 650 Volt grade semi-flexible copper cable conforming to IEC: 227 or IS: 1554, heat resistant, flame, vermin and rodent proof. The wiring shall be securely supported and taken through PVC troughs. All panel wiring shall be capable of withstanding a voltage of 2 kV A.C. 50 Hz for one minute. The sizes of for control wiring in the cabinet shall be not less than 1.5 sqmm. CT secondary wiring shall be 2.5 sq. mm. 11.4.1. Fuse protection The cabinet shall be equipped with links and HRC cartridge fuses in 650-volt grade phenolic moulded fuse holders consisting of fuse carriers and bases. The holders shall be of high grade, flame retardant and non-hygroscopic material of dark brown or black colour with hard glass surface. Each fuse shall be identified with engraved plastic labels.

11.4.2. Terminal blocks Terminal blocks rated for 10 amps. continuous current, 650 Volt grade covered by moulded insulating materials with adequate electrical clearances shall be provided for terminating the panel wiring and outgoing connections. The termination shall be made by crimping lugs or bare wire with insulating sleeves at ends. The arrangement can be horizontal or vertical as per standard practice adopted by the manufacturer. All terminals must be numbered and wire termination provided with numbered ferrules for identification. All numbering and marking including those in wiring diagram shall follow the guide lines provided in IS: 11353. Ten percent spare terminals shall be provided. 11.4.3. Colours

The wiring used for AC supply for illumination lamp and heater shall be differently coloured from control wiring so that these can be distinguished from each other. The colour of all earth wires shall be black.

11.5. Circuit diagram A durable copy of the circuit wiring diagram shall be affixed to the inner side of the control cabinet door. Labels shall be provided inside the cabinet to describe the functions of various items of equipment.

11.6. Cable entry A removable gland plate shall be provided at the bottom of the cabinet for entry of Purchaser’s control and auxiliary power cables in the cabinet. Required number of electroplated brass cable glands of appropriate sizes with shrouds shall be provided in consultation with the Purchaser in the gland plate for the control and power cables. Provision shall be made for earthing of the cable armours in the glands.

12. OPERATING MECHANISM

12.1. General The operating mechanism of the circuit breakers shall be motor wound spring charged type. It shall be electrically and mechanically trip free with anti pumping device (as per IEC 694 definition). All working parts in the mechanism shall be of corrosion resistant material. Self lubricating, wear resistant bearings shall be provided in the mechanism.


- 23 -

The mechanism shall fully close the circuit breaker and sustain it in the closed position against the forces of the rated making current and shall fully open the circuit breaker without undue contact bounce at a speed commensurate with that shown by tests to be necessary to achieve the rated breaking capacity in accordance with IEC: 56 or IS: 13118. The mechanism shall be capable of being locked in either the open or closed position. The mechanism shall be capable of fully closing and opening again after the auto-reclose time interval specified as 0.3 second in clause 5, item 10.

12.2. Spring mechanism The spring operating mechanism shall be complete with spring charging motor, opening and closing springs with limit switches and all accessories necessary for automatic charging. In normal operation, recharging of the operating springs shall commence immediately and automatically upon completion of the closing operation so that a complete sequence of opening, closing and opening operations should be possible. It shall be possible to hand charge the operating springs with the circuit breaker in either the open or closed position conveniently from the ground level. Closure whilst a spring charging operation is in progress shall be prevented and release of the springs shall not be possible until they are fully charged. The state of charge of the operating springs shall be indicated by a mechanical device showing ‘SPRING CHARGED’ when closing spring is fully charged and operation is permissible and ‘SPRING FREE’ when closing spring is not fully charged and the operation is not possible. Provision shall be made for remote electrical indication of ‘Spring Charged’ and ‘Spring Free’ conditions. The operating mechanism shall be such that the failure of any auxiliary spring shall not cause tripping or closing of the circuit breaker but shall not prevent tripping against trip command. Closing action of the circuit breaker shall charge the opening spring ready for tripping. From the close position with spring charged, one open-close-open operation shall be possible without recharging the spring.

12.3. Motor The motor for spring charging shall be single phase 230 Volt A.C. motor. Continuous motor rating shall be at least ten percent above the maximum load demand of the driven equipment. It shall remain within its rated capacity at all operating points that will arise in service. It shall be protected by HRC cartridge fuses or MCB. The motor shall be tested as per IEC: 34 / IS: 996.

13. AUXILIARY POWER SUPPLY The mechanism shall be suitable to operate with the following auxiliary power supplies:

a) 230V, 50 Hz, single phase A.C - for spring charging motor. b) DC Supply 24 Volts - for close and open coils.

The DC supply shall be from a Power Pack. The Input to Power Pack is 110 V from PT or 230 V from main supply .The Power pack should be capable for minimum 3 Trippings even if input to Power pack is failed.. The mechanism shall be designed to operate satisfactorily despite fluctuations of auxiliary power supplies as under:

• AC supply: Voltage from 115% to 85% of normal voltage; Frequency from 105% to 95% of normal frequency; Combined voltage from 115% to 85% of normal. and frequency variation

• DC supply: Voltage from 120% to 70% of normal voltage.


- 24 -

14. INTERLOCKS The circuit breakers shall be capable of being mechanically and electrically interlocked with the associated line isolators so that the isolator cannot be operated with the breaker in the closed position. All doors or shutters which give access to live parts shall be interlocked in such a way that these cannot be opened unless the circuit breaker is in the open position. Other interlocks shall be provided as deemed necessary for safety.

15. PROTECTION AND METERING Details provided in clause No. 9 & 10

16. TERMINAL CONNECTOR Suitable terminal connectors of bi-metallic type shall be provided on the terminal pads both on the incoming and the outgoing sides for connection to jumpers of ACSR or AAAC conductor in any direction. The size of the conductor may vary between 50 sq.mm.(Rabbit) and 150 sq.mm.(Wolf) depending upon the location of the circuit breaker. The terminal connection drawing and details are to be approved by the Purchaser before fabrication. The terminal connectors shall be bi-metallic type to avoid bimetallic corrosion.

17. INSULATION AND CLEARANCES

a) The insulation to ground, the insulation between open contacts and insulation between phases of the circuit breakers shall be capable of satisfactorily withstanding dielectric test voltages. b) The minimum clearances in open air shall be as follows:

• between poles - 280 mm

• phase to earth - 280 mm

• ground clearance for live part - 3114 mm

18. TEMPERATURE RISE The temperature rise and the maximum temperature of any part of the circuit breaker under continuous load condition and exposed in the direct rays of the sun shall not exceed the permissible limits as provided in Table V of IEC publication 694 or table 4 of IS: 12729. These limits shall not be exceeded when corrected for the difference between the ambient temperature at site and the ambient temperature specified in the standard. The correction proposed shall be stated in the tender.

19. TESTS

19.1. Type and routine tests The circuit breakers shall be subjected to routine and type tests in accordance with the standards listed in this specification including the following IS and IEC standards with the latest amendments:

• Circuit breaker IEC: 56 and IS :13118 and relevant other standards.

• Porcelain insulators IEC: 233 and IS: 5621 and relevant other standards. The tests shall include but not limited to the following:


- 25 -

19.2. Short circuit tests The circuit breaker shall satisfactorily perform the out of phase and short circuit duties specified in IEC: 56, IEC: 17A(Sectt.)438 and IEC: 17A/CD/474 and IS: 13118 and IS: 13516. The circuit breaker shall be capable of performing at least twenty five (25) opening operations at the rated short circuit current before maintenance or inspection is required.

19.3. Capacitive current switching

Capacitive switching tests shall be performed in accordance with IEC: 56 or IS:13118 and IEC:17A/CD/474 by direct test method or alternatively using synthetic method to IEC: 427/IS: 13516. The test circuits shall simulate the most onerous site conditions.

19.4. Dielectric tests At zero gauge gas pressure inside the interrupter chamber, the open contacts shall continuously, the rated phase to ground voltage and it shall be possible to break normal current in these conditions. During the dielectric type tests, no flashover external or internal shall be acceptable. The circuit breakers shall be subjected to power frequency AC voltage one minute test in dry and wet conditions and there shall be no external flash over to earth.

19.5. Mechanical endurance In addition to the requirements of IEC: 56, an extended mechanical endurance test is required to show that the circuit breaker is capable of at least 10,000 operations at no load in accordance with IEC: 17A/474/CD. Between the specified test series in IEC: 17A/474/CD, some maintenance such as lubrication and mechanical adjustment is allowed and shall be performed in accordance with manufacturer’s instructions. Change of contacts is not permitted.

19.6. Low current switching The circuit breaker shall produce very low over voltages (<2.0 pu) on all switching circuits including inductive current switching and capacitive current switching to IEC: 17A (Secretariat) 438 and IEC: 17A//CD/474. The circuit breaker shall be reignition or restrike free for all duties.

19.7. Duty requirement tests This clause is deleted.

19.8. Temperature rise test Temperature rise test is to be conducted on the circuit breakers and the accessories in accordance with IEC: 56 or IS: 13118. The temperature rise shall be limited to those specified in clause 15.

20. PERFORMANCE REQUIREMENTS The supplier shall declare the circuit breaker opening and closing times at 120 percent, 100 percent and 85 percent of the rated voltage of the opening and closing devices when measured at the terminals of the trip and closing coils; for DC operated devices the corresponding percentage figures shall be 120 percent, 100 percent and 70 percent.

21. EARTHING All metal parts not intended for carrying current or not alive shall be connected to duplicate earthing system and suitable earthing terminals of electroplated brass shall be provided on each circuit breaker in conformity with IEC: 56 or IS: 13118. Suitable identification mark for the earth terminal shall be provided adjacent to the terminal.


- 26 -

Earth continuity conductors shall be provided down to the ground level for earth connection to Purchaser's earthing grid. It shall have sufficient cross sectional area to afford a low resistance path for the full fault current envisaged. Such conductor shall also be provided for the CTs up to the ground level. The size of the earth continuity conductor shall be large enough to reduce the potential rise of the metal frame of the breaker in the event of fault to minimum but in any case not more than 10 V. The size of the conductor shall also be adequate to restrict the temperature rise without causing any damage to the earth connection in the case of fault. No riveted joints in the earth conducting path shall be permissible and only bolted joints of adequate size shall be provided with nuts, bolts and plain and spring washers. The surfaces to be jointed shall be perfectly flat without any unevenness to ensure that there is no contact resistance. An earth busbar of copper strip shall be provided inside the local control cabinet to which all earthing connections must be made. The earth busbar shall be terminated into two electroplated brass earthing terminals of adequate size with nuts, bolts and washers for connecting to earth continuity conductor mentioned above.

PART 3: GENERAL PARTICULARS AND GUARANTEES

22. OPERATIONAL TRAINING The circuit breaker Supplier shall provide comprehensive operational and routine maintenance training to the nominated DISTCOM’s employees at respective Hqr’s of the companies namely BERHAMPUR, BURLA or at BALASORE or on site. The number of employees and place of training shall be mutually agreed.

23. COMPLIANCE WITH SPECIFICATION The circuit breakers shall comply in all respects with the requirements of this specification. However, any minor departure from the provisions of the specification shall be disclosed at the time of tendering in the Non Compliance Schedule in part four of this document. The mass and dimensions of any item of equipment shall not exceed the figures stated in the schedules.

24. COMPLIANCE WITH REGULATIONS All the equipment and accessories shall comply in all respects with the Indian Regulations and Acts in force. The equipment and connections shall be designed and arranged to minimise the risk of fire and any damage which might be caused in the event of fire.

25. QUALITY ASSURANCE, INSPECTION AND TESTING

25.1. General To ensure that the supply and services under the scope of this Contract, whether manufactured or performed within the Supplier’s works or at his Sub-supplier’s premises or at any other place of work are in accordance with the Specification, with the regulations and with relevant authorised international or Indian standards, the Supplier shall adopt suitable Quality Assurance Programmes and Procedures to ensure that all activities are being controlled as necessary. The quality assurance arrangements shall conform to the relevant requirements of ISO 9001 or ISO 9002 as appropriate. The systems and procedures which the Supplier will use to ensure that the Plant complies with the Contract requirements shall be defined in the Supplier’s Quality Plan for the Works. The Supplier shall operate systems which implement the following: Hold point “A stage in the material procurement or workmanship process beyond which work shall not proceed without the documented approval of designated individuals or organisations.”


- 27 -

The Purchaser’s written approval is required to authorise work to progress beyond the Hold Points indicated in approved Quality Plans. Notification point “A stage in material procurement or workmanship process for which advance notice of the activity is required to facilitate witness.” If the Purchaser does not attend after receiving documented notification in accordance with the agreed procedures and with the correct period of notice, then work may proceed.

25.2. Quality Assurance programme Unless the Supplier’s Quality Assurance system has been audited and approved by the Purchaser, a Quality Assurance programme for the Works shall be submitted to the Purchaser for approval within a minimum of one month from contract award, or such other period as shall be agreed with the Purchaser. The Quality Assurance programme shall give a description of the quality system for the Works and shall, unless advised otherwise, include details of the following:

• The structure of the organisation;

• The duties and responsibilities assigned to staff ensuring quality of work;

• The system for purchasing, taking delivery and verification of materials;

• The system for ensuring quality of workmanship;

• The system for control of documentation;

• The system for the retention of records;

• The arrangements for the Supplier’s internal auditing;

• A list of the administration and work procedures required to achieve and verify Contract’s quality requirements. These procedures shall be made readily available to the Purchaser for inspection on request.

25.3. Quality plans The Supplier shall draw up for each section of the work, quality plans which shall be submitted to the Purchaser for approval at least two weeks prior to the commencement of work of the particular section. Each quality plan shall set out the activities in a logical sequence and, unless advised otherwise, shall include the following:

• An outline of the proposed work and programme sequence;

• The structure of the Supplier’s organisation for the Contract;

• The duties and responsibilities assigned to staff ensuring quality of work for the Contract;

• Hold and notification points;

• Submission of engineering documents required by the Specification;

• The inspection of materials and components on receipt;

• Reference to the Supplier’s Work procedures appropriate to each activity;

• Inspection during fabrication/construction;

• Final inspection and test.

25.4. Non-conforming product The Purchaser shall retain responsibility for decisions regarding acceptance, modification or rejection of non-conforming items.


- 28 -

25.5. Sub-suppliers The Supplier shall ensure that the Quality Assurance requirements of this Specification are followed by any Sub-suppliers appointed by him under the Contract. The Supplier shall assess the sub-supplier’s Quality Assurance arrangements prior to his appointment to ensure compliance with the appropriate ISO 9000 standard and the Specification. Auditing of the Sub-supplier’s Quality Assurance arrangements shall be carried out by the Supplier and recorded in such a manner that demonstrates to the Purchaser the extent of the audits and their effectiveness.

25.6. Inspection and testing

The Purchaser shall have free entry at all times, while work on the contract is being performed, to all parts of the manufacturer's works which concern the processing of the equipment ordered. The manufacturer shall afford the Purchaser without charge, all reasonable facilities to assure that the equipment being furnished is in accordance with this Specification. The equipment shall successfully pass all the type tests and routine tests referred to in part 2 of this Specification and those listed in the most recent edition of the standards given in clause 2 of this Specification. The Purchaser reserves the right to reject an item of equipment if the test results do not comply with the values specified or with the data given in the technical data schedule. Type tests shall be carried out at an independent testing laboratory or be witnessed by a representative of such laboratory or some other representative acceptable to the Purchaser. Type tests may be dispensed with at the Purchaser's discretion if the Supplier furnishes evidence to the Purchaser's satisfaction that the relevant tests have already been performed on identical equipment. In this case test certificates shall be submitted with the bid for evaluation. Routine and acceptance tests shall be carried out by the Supplier at no extra charge at the manufacturer's works. The Purchaser may witness routine and type tests. In order to facilitate this, the Supplier shall give the Purchaser a minimum of four weeks notice that the material is ready for testing. If the Purchaser does not indicate his intention to participate in the testing, the manufacturer may proceed with the tests and shall furnish the results thereof to the Purchaser. Full details of the proposed methods of testing, including connection diagrams, shall be submitted to the Purchaser by the Supplier for approval, at least one month before testing. All costs in connection with the testing, including any necessary re-testing, shall be borne by the Supplier who shall provide the Purchaser with all the test facilities which the latter may require, free of charge. The Purchaser shall have the right to select the samples for test and shall also have the right to assure that the testing apparatus is correct. Measuring apparatus for routine tests shall be calibrated at the expense of the Supplier at an approved laboratory and shall be approved by the Purchaser. The Supplier shall be responsible for the proper testing of the plant or materials supplied by Sub-suppliers to the same extent as if the plant or materials were supplied by the Supplier. Any cost incurred by the Purchaser in connection with inspection and re-testing as a result of failure of the equipment under test or damage during transport or off loading shall be to the account of the Supplier. The Supplier shall submit to the Purchaser five signed copies of the test certificates, giving the results of the tests as required. No materials shall be dispatched until the test certificates have been received by the Purchaser and the Supplier has been informed that they are acceptable. The test certificates must show the actual values obtained from the tests, in the units used in this specification, and not merely confirm that the requirements have been met. In the case of components for which specific type tests or routine tests are not given in part 2, or in the quoted standards in clause 2 of this Specification, the Supplier shall include a list of the tests normally required for these


- 29 -

components. All materials used in the Contract shall withstand and shall be certified to have satisfactorily passed such tests. No inspection or lack of inspection or passing by the Purchaser’s representative of equipment or materials whether supplied by the Supplier or Sub-supplier, shall relieve the Supplier from his liability to complete the Contract works in accordance with the Contract or exonerate him from any of his guarantees. 25.7. Guarantee The Supplier shall guarantee the following :

• Quality and strength of materials used; • Satisfactory operation during the guarantee period of one year from the date of commissioning, or 18 months from the date of acceptance of the equipment by the Purchaser following delivery, whichever is the earlier; • Performance figures as supplied by the tenderer in the Technical Data Schedule; • The offered surface treatment shall protect the treated metal from corrosion for a period of not less than five years from the date of delivery.

26. PROGRESS REPORTING The Supplier shall submit for approval within four weeks of the starting date of the contract, a chart showing outline of production, inspection and delivery. Within a further period of four weeks, the Supplier shall provide a detailed programme of the same information in a form to be agreed by the Purchaser. The Supplier shall submit two copies of monthly progress reports not later than the 7th day of the following month. The reports shall show clearly and accurately the position of all activities associated with the material procurement, manufacture, works tests and transport with regard to the agreed Contract programme. The preferred format for presentation of programmes is MS Project Version 4.0. Programmes and monthly updates should be submitted on 3.5” diskettes. The design aspect of the progress report shall include a comprehensive statement on drawings, calculations and type test reports submitted for approval. The position on material procurement shall give the dates and details of orders placed and indicate the delivery dates quoted by the manufacturer. If any delivery date has an adverse effect on the Contract programme, the Supplier shall state the remedial action taken to ensure that delays do not occur. The position on manufacture shall indicate the arrival of raw material and the progress of manufacture. Any events that may adversely affect completion in the manufacturer’s works shall also be reported. All works tests done shall be listed and test results shall be remarked upon. Any test failure shall be highlighted. The dispatch of each order shall be monitored on the progress report giving the date by which the equipment will be available for transport, the estimated time of arrival at destinations and the dates actually achieved. Delays or test failures in any part of the programme which may affect any milestone or final completion dates shall be detailed by the Supplier who shall state the action taken to effect Contract completion in accordance with the Contract programme.

27. SPARE PARTS AND SPECIAL TOOLS The Supplier shall provide the mandatory spares as follows for every ten circuit breakers: • Two nos power pack having output of 24 volts DC with each Circuit Breaker, • One complete pole assembly of the circuit breaker; • One vacuum interrupter bottle (for vacuum type only); • One trip coil; • One close coil; • One insulated drive rod;


- 30 -

• One spring charging motor;

• One set of spring charging limit switches;

• One set of gaskets complete for one circuit breaker. The prices of mandatory spares will be taken into account in the evaluation of tenders. The Bidder shall provide a list of recommended spare parts together with their individual prices. This list shall identify all essential spares and consumable items for any recommended maintenance for a period of five years after commissioning. The Purchaser may order all or any of the spare parts listed at the time of contract award and the spare parts so ordered shall be supplied as part of the definite works. The Purchaser may order additional spares at any time during the contract period at the rates stated in the contract document. A spare parts catalogue with price list shall be provided and this shall form part of the drawings and literature to be supplied. The Bidder shall give an assurance that spare parts and consumable items will continue to be available through the life of the equipment, which shall be 25 years minimum. However, the Supplier shall give a minimum of 12 months notice in the event that the Supplier or any Sub-suppliers plan to discontinue manufacture of any component used in this equipment. Any spare apparatus, parts or tools shall be subject to the same specification, tests and conditions as similar material supplied under the definite work section of the Contract. They shall be strictly interchangeable and suitable for use in place of the corresponding parts supplied with the plant and must be suitably marked and numbered for identification. Spare parts shall be delivered suitably packed and treated for long periods in storage. Each pack shall be clearly and indelibly marked with its contents, including a designation number corresponding to the spare parts list in the operation and maintenance instructions. A complete set of all the special tools, devices, slings and shackles required for the adjustment and maintenance of the equipment shall be supplied in the quantity listed in the schedule. Each set of tools shall be mounted in a lockable cabinet. This shall also be provided under this contract. Eye bolts which have to be removed after use shall be accommodated in the cabinet.

28. PACKING AND SHIPPING

28.1. Packing

The equipment and the supporting structures are to be transported adequately sealed against water ingress. All accessories and spares shall be packed and securely clamped against movement in robust, wooden, non returnable packing cases to ensure safe transit in rough terrain, cross country road conditions and in heavy rains from the manufacturer's works to the specified destinations. Equipment or material liable to deterioration by sea water, moisture, or ingress of foreign matter shall be totally sealed in strong polythene bags and those liable to deterioration due to condensation shall be protected by packs of silica gel or other approved desiccant. All accessories shall be carefully packed so that they are fully protected during transport and handling operations and in storage. Internal surfaces of loose accessories shall be sealed by means of gaskets and blanking off plates. All parts liable to rust shall receive an anti-rusting coat and shall be suitably protected. It shall be the responsibility of the Supplier to make good any damage caused through insufficient packing. Each packing case shall be indelibly marked, on two adjacent sides and on the top, with the following:

• individual serial number;

• purchaser's name;

• contract number;


- 31 -

• destination;

• a colour coded marking to indicate destination;

• supplier's name;

• name and address of supplier's agent in Orissa;

• description and numbers of contents;

• manufacturer’s name;

• country of origin;

• case measurements;

• gross and net weights in kilograms; and

• all necessary slinging and stacking instructions. Each crate or container shall be marked clearly on the outside of the case to show TOP and BOTTOM positions with appropriate signs to indicate where the mass is bearing and the correct positions for slings. All component parts which are separately transported shall have permanent identification marks to facilitate correct matching and assembly at site. Welded parts shall be identified and marked before welding. Six copies of each packing list shall be sent to the Purchaser prior to dispatching the equipment.

28.2. Shipping

The Supplier shall be responsible for the shipping of all plant and equipment supplied from abroad to the ports of entry and for the transport of all goods to the various specified destinations including customs clearance, off loading, warehousing and insurance.

The Supplier shall inform himself fully as to all relevant transport facilities and requirements and loading gauges and ensure that the equipment as packed for transport shall conform to these limitations. The Supplier shall also be responsible for verifying the access facilities specified. The Supplier shall be responsible for the transportation of all loads associated with the Contract works and shall take all reasonable steps to prevent any highways or bridges from being damaged by his traffic and shall select routes, choose and use vehicles and restrict and distribute loads so that the risk of damage shall be avoided. The Supplier shall immediately report to the Purchaser any claims made against the Supplier arising out of alleged damage to a highway or bridge. All transport accessories, such as riding lugs, jacking pads or blanking off plates shall become the property of the Purchaser. All items of equipment shall be securely clamped against movement to ensure safe transit from the manufacturer's facilities to the specified destinations. The Supplier shall advise the storage requirements for any plant and equipment that may be delivered to the Purchaser's stores. The Supplier shall be required to accept responsibility for the advice given in so far as these arrangements may have a bearing on the behaviour of the equipment in subsequent service.

28.3. Hazardous substances The Supplier shall submit safety data sheets in a form to be agreed for all hazardous substances used with the equipment. The Supplier shall give an assurance that there are no other substances classified as hazardous in the equipment supplied. No oil shall be supplied or used at any stage of manufacture or test without a certificate acceptable to the Project Manager that it has a PCB content of less than 2 mg / kg. The Supplier shall accept responsibility for the disposal of such hazardous substances, should any be found. The Supplier shall be responsible for any injuries resulting from hazardous substances due to non compliance with these requirements.


- 32 -

29. SUBMITTALS

29.1. Submittals required with the bid The following shall be required in duplicate :

• completed technical data schedule;

• descriptive literature giving full technical details of equipment offered;

• outline dimension drawing of circuit breaker, for each major component, general arrangement drawing showing component layout and general schematic diagrams;

• type test certificates, where available, and sample routine test reports;

• detailed reference list of customers already using equipment offered during the last five years with particular emphasis on units of similar design and rating;

• details of manufacturer's quality assurance standards and programme and ISO 9000 series or equivalent national certification;

• deviations from this specification. Only deviations approved in writing before award of contract shall be accepted;

• list of recommended spare parts and consumable item s for five years operation with prices and spares parts catalogue with price list for future requirement.

29.2. Submittals required after contract award 29.2.1. Programmes

Five copies of the programme for production and testing. 29.2.2. Technical particulars Within 30 days of contract award, five bound folders with records of the technical particulars relating to the equipment. Each folder shall contain the following information:

• general description of the equipment and all components, including brochures;

• technical data schedule, with approved revisions;

• calculations to substantiate choice of electrical, structural, mechanical component size/ratings;

• detailed dimension drawing of circuit breaker, for all components, general arrangement drawing showing detailed component layout and detailed schematic and wiring drawings including for all components;

• detailed foundation drawing, loading diagram and calculations to enable the purchaser to design and construct foundation. The foundation shall be capable of withstanding both static and dynamic loads of the circuit breaker;

• statement drawing attention to all exposed points in the equipment at which copper/aluminium or copper/aluminium alloy parts are in contact with or in close proximity to other metals and stating clearly what protection is employed to prevent corrosion at each point;

• detailed installation and commissioning instructions.

At the final hold point for Purchaser’s approval prior to delivery of the equipment, the following shall be submitted:

• inspection and test reports carried out in the manufacturer's works;

• operation and maintenance instructions as well as trouble shooting charts.


- 33 -

29.2.3. Operation and maintenance instructions

A copy of the detailed installation and commissioning instructions and of the operation and maintenance instructions and trouble shooting charts shall be supplied with each circuit breaker.

29.3. Drawings Within 30 days of contract commencement the Supplier shall submit, for approval by the Purchaser, a schedule of the drawings to be produced detailing which are to be submitted for “Approval” and which are to be submitted “For Information Only”. The schedule shall also provide a programme of drawing submission, for approval by the Purchaser, that ensures that all drawings and calculations are submitted within the period specified above. All detail drawings submitted for approval shall be to scale not less than 1:20. All important dimensions shall be given and the material of which each part is to be constructed shall be indicated on the drawings. All documents and drawings shall be submitted in accordance with the provisions of this specification and shall become the property of the Purchaser. All drawings and calculations, submitted to the Purchaser, shall be on international standard size paper, A0, A1, A2, A3 or A4. All such drawings and calculations shall be provided with a contract title block, which shall include the name of the Purchaser and Consultants and shall be assigned a unique project drawing number; the contract title block and project numbering system shall be agreed with the Purchaser. Lettering sizes and thickness of lettering and lines shall be selected so that if reduced by two stages to one quarter of their size, the alphanumeric characters and lines are still perfectly legible so as to enable them to be microfilmed . For presentation of design drawings and circuit documents, IEC Publication 617 or equivalent standards for graphical symbols are to be followed.

30. APPROVAL PROCEDURE The Supplier shall submit all drawings, documents and type test reports for approval in sufficient time to permit modifications to be made if such are deemed necessary and re-submit them for approval without delaying the initial deliveries or completion of the Contract. The Purchaser’s representative shall endeavour to return them within a period of four weeks from the date of receipt. Three copies of all drawings shall be submitted for approval and three copies for any subsequent revision. The Purchaser reserves the right to request any further additional information that may be considered necessary in order to fully review the drawings. If the Purchaser is satisfied with the drawing, one copy will be returned to the Supplier marked with “Approved” stamp. If the Purchaser is not totally satisfied with the drawing, then “Approved Subject to Comment” status will be given to it and a comment sheet will be sent to the Supplier. If the drawing submitted does not comply with the requirements of the Specification then it will be given “Not Approved” status and a comment sheet will be sent to the Supplier. In both these cases the Supplier will have to modify the drawing, update the revision column and resubmit for final approval. Following approval, twenty copies of the final drawings will be required by the Purchaser. Any drawing or document submitted for information only should be indicated as such by the Supplier. Drawings and documents submitted for information only will not be returned to the Supplier unless the Purchaser considers that such drawing needs to be approved, in which case they will be returned suitably stamped with comments. The Supplier shall be responsible for any discrepancies or errors in or omissions from the drawings, whether such drawings have been approved or not by the Purchaser. Approval given by the Purchaser to any drawing shall not relieve the Supplier from his liability to complete Contract works in accordance with this specification and the condition of Contract nor exonerate him from any of his guarantees.

If the Supplier needs approval of any drawing within a period of less than four weeks in order to avoid delay in the completion of supply, he shall advise the Purchaser when submitting the drawings and provide an explanation of the document’s late submission. The Purchaser will endeavour to comply with the Contractors time scale, but this cannot be guaranteed.


- 34 -

31. SURFACE TREATMENT

A full description of the corrosion prevention system proposed by the Bidder shall be given in the schedule and this is subject to acceptance by the Purchaser. This description shall include details of surface preparation, rust inhibition, paint thickness, treatment of fasteners and painting of surfaces in contact with oil.

All machining, drilling, welding, engraving, scribing, or other manufacturing activities which would damage the final surface treatment shall be completed before the specified surface treatment is carried out. Any subsequent damage occurring to the surface treatment up to the final delivery, off-loading and acceptance shall be made good by the Supplier.

31.1. Painting All paints shall be applied on clean, dry surfaces under suitable atmospheric and other conditions in accordance with the paint manufacturer’s instructions. All paints used shall be compatible with each other and capable of being used as a system. The system shall be capable of performance for five years in the environment specified without any need for maintenance.

No consecutive coats of paint shall be of the same shade.

The minimum standards acceptable are:

• Cleaning by shot blasting to Grade Sa 2.5 of ISO 8501-1.

• All sheet steel shall be degreased, pickled and phosphated in accordance with IS: 6005-“Code of practice for phosphating of iron and steel.”

• All rough surfaces of coatings shall be filled with an approved two pack filler and rubbed down to a smooth finish.

• Interior surfaces of mechanism chambers and cabinets after preparation, cleaning and priming shall be painted with one coat of zinc chromate primer, one coat of phenolic based undercoating, followed by one coat of phenolic based finishing paint to white colour followed by a final coat of anti-condensation white paint of a type and make to the approval of the Purchaser. A minimum overall paint film thickness of 150 microns shall be maintained throughout. The first coat of primer shall be applied on the same day, preferably within two hours of shot blasting.

• Exterior steel and metal surfaces, after preparation and priming shall be painted with one coat of zinc chromate primer, one coat of phenolic based under coating and two coats of micaceous iron oxide paint, then painted with a final coat of phenolic based hard glass finishing paint of the Light Grey shade No 631 of IS: 5, to provide an overall minimum paint thickness of 200 microns.

31.2. Galvanising All galvanising shall be carried out by the hot dip process, in accordance with Specification ISO: 1460 or IS: 2629. However, high tensile steel nuts, bolts and spring washers shall be electro galvanised to service condition four. The zinc coating shall be smooth, continuous and uniform. It shall be free from acid spots and shall not scale, blister or be removable by handling or packing. There shall be no impurities in the zinc or additives to the galvanic bath which could have a detrimental effect on the durability of the zinc coating.

Before pickling, all welding, drilling, cutting, grinding and other finishing operations must be completed and all grease, paint, varnish, oil, welding slag and foreign bodies completely removed. All protuberances which would affect the life of galvanising shall also be removed.

The weight of zinc deposited shall be in accordance with BS 729 and shall not be less than 0.61kg/m2 with a minimum thickness of 86 microns for items of thickness more than 5 mm, 0.46 kg/m2 (64 microns) for items of thickness between 2 mm and 5 mm and 0.33 kg/ m2 (47 microns) for items less than 2 mm thick.


- 35 -

Parts shall not be galvanised if their shapes are such that the pickling solution cannot be removed with certainty or if galvanising would be unsatisfactory or if their mechanical strength would be reduced. Surfaces in contact with oil shall not be galvanised unless they are subsequently coated with an oil resistant varnish or paint.

In the event of damage to the galvanising the method used for repair shall be subject to the approval of the Purchaser or his representative. The threads of all galvanised bolts and screwed rods shall be cleared of spelter by spinning or brushing. A die shall not be used for cleaning the threads unless specifically approved by the Purchaser. All nuts shall be galvanised. The threads of nuts shall be cleaned with a tap and the threads oiled. Partial immersion of the work shall not be permitted and the galvanising tank must therefore be sufficiently large to permit galvanising to be carried out by one immersion. After galvanising no drilling or welding shall be performed on the galvanised parts of the equipment excepting that nuts may be threaded after galvanising. To avoid the formation of white rust, galvanised material shall be stacked during transport and stored in such a manner as to permit adequate ventilation. Sodium dichromate treatment shall be provided to avoid formation of white rust after hot dip galvanisation.

The galvanisation shall be subjected to tests as per IS: 2633 and BS: 729.

32. FASTENERS All bolts, studs, screw threads, pipe threads, bolt heads and nuts shall comply with the appropriate Indian Standards for metric threads, or the technical equivalent. Bolts or studs shall not be less than 6 mm in diameter except when used for small wiring terminals. All nuts and pins shall be adequately locked. Wherever possible bolts shall be fitted in such a manner that in the event of failure of locking resulting in the nuts working loose and falling off, the bolt will remain in position. All ferrous bolts, nuts, and washers placed in outdoor positions shall be treated to prevent corrosion, by hot dip galvanising, except high tensile steel bolts and spring washers which shall be electro-galvanised to service condition four. Appropriate precautions shall be taken to prevent electrolytic action between dissimilar metals. Where bolts are used on external horizontal surfaces and where water can collect, methods of preventing the ingress of moisture to the threads shall be provided. Each bolt or stud shall project at least one thread but not more than three threads through the nut, except when otherwise approved for terminal board studs or relay stems. If bolts or nuts are placed so that they are inaccessible by means of ordinary spanners, special spanners shall be provided. The length of the screwed portion of the bolts shall be such that no screw thread may form part of a shear plane between members. Taper washers shall be provided where necessary. Protective washers of suitable material shall be provided front and back on the securing screws.

33. COMPLETENESS OF CONTRACT All fittings or accessories, although not specifically mentioned herein, but necessary or usual for similar equipment and their efficient performance shall be provided by the Supplier without extra charges. The bid shall clearly indicate if any additional equipment or parts would be necessary to give a complete offer and if so, the details and the prices shall be included in the bid.

34. PADLOCKS The Supplier shall provide padlockable handles and non-ferrous padlocks with duplicate keys for the local control cabinet door to prevent all unauthorised access and operation.


- 36 -

35. LABELS All apparatus shall be clearly labelled indicating, where necessary, its purpose and service positions. The material of all labels and plates, their dimensions, legend and the method of printing shall be subject to approval of the Purchaser. The surfaces of all labels and plates shall have a mat or satin finish to avoid dazzle from reflected light. Colours shall be permanent and free from fading. Labels mounted on black surfaces shall have white lettering. All labels and plates for outdoor use shall be of non corroding material. Where the use of enamelled iron plates is approved, the whole surface including the back and edges, shall be properly covered and made resistant to corrosion. They shall be engraved in English. No scratching, corrections or changes will be allowed on name plates. All equipment mounted on front and rear sides as well as equipment mounted inside the panels shall be provided with individual name plates with equipment designation engraved. Unless otherwise specified, name plates shall be provided of white background with black engraved lettering carrying all the applicable information specified in the standards and other details as required by the Purchaser. The name plate inscription and the size and lettering shall be submitted to the Purchaser for approval.


- 37 -

PART 4: SCHEDULES

36. TECHNICAL DATA SCHEDULE

ITEM NO

DESCRIPTION UNITS BIDDER’S OFFER

1. GENERAL - Name of manufacturer - Manufacturer’s type designation - Governing standard - No. of poles of circuit breaker - No. of breaks per phase - Total length of break per phase - Type SF6 or vacuum

no no mm SF6/vacuum

2. NOMINAL VOLTAGES - Rated voltage - Maximum (continuous) service rated voltage

kV kV

3. RATED NORMAL CURRENTS - Under normal condition - Under site condition

amps. amps.

4. SHORT CIRCUIT PERFORMANCES - Rated short circuit breaking current:

• Symmetrical, rms • Asymmetrical including DC component,

- Rated short circuit making current; peak - Short time current withstand capability:

• Peak value • rms. value • Duration

kA kA kA kA kA Sec

5. MAX. TEMP. RISE OVER AMBIENT OF 50°C - At normal continuous current - After performing the operating sequence

°C °C

6. MAKE AND BREAK TIMES


- 38 -

ITEM NO


- Total break times . At 10% rupturing capacity . At rated rupturing capacity - Arcing time at rated breaking current - Make time from giving close command - Minimum reclose time at full rated interrupting capacity from trip coil energisation - Minimum dead time for 3 phase reclosing - Circuit breaker opening time: · at 125 % of rated voltage of opening device · at 100 % of rated voltage of opening device · at 70 % of rated voltage of opening device - Circuit breaker closing time: · at 125 % of rated voltage of closing device · at 100 % of rated voltage of closing device · at 70 % of rated voltage of closing device

milli-sec milli-sec milli-sec milli-sec Sec Sec milli-sec milli-sec milli-sec milli-sec milli-sec milli-sec

7. RESTRIKING VOLTAGES FOR 100% RATED CAPACITY - Amplitude factor - Phase factor - Natural frequency - Rate of rise of recovery voltage

kV Hz kV/µS

8. RATED INSULATION LEVEL Dry and wet power frequency withstand test voltage for 1 minute, rms: . Between live terminals and grounded objects . Between terminals with breaker contacts open - 1.2 /50 µs full wave impulse withstand voltage + ve and - ve polarity, peak. . Between live terminals and grounded objects . Between terminals with breaker contacts open - One minute power frequency withstand voltage of auxiliary wiring

kV kV kV kV kV

9. OPERATING PERFORMANCE - Rated transient recovery voltage - Rated cable charging breaking current

kV amps.


- 39 -

ITEM NO


- Rated single capacitor bank breaking current - Rated back-to-back capacitor bank breaking current - Rated capacitor bank in-rush making current - Rated small inductive breaking current - First pole-to-clear-factor - Rated operating sequence. - Rated out of phase breaking current - Re-ignition free - Re-strike free

amps. amps. amps. amps. kA yes/no yes/no

10. NUMBER OF OPERATION POSSIBLE WITHOUT

MAINTENANCE - at full rated interrupting current - at 50 % of rated interrupting current - at 100 % of full load current - at no load

no no no no

11. MINIMUM CLEARANCE IN AIR - Between phases - Live parts to earth - Live parts to ground level

mm mm mm

12. WEIGHTS AND DIMENSIONS Total weight of one complete breaker, including mounting structure Mounting structure weight Control cabinet weight Dimensions; Height Width Depth. Drawings must be provided.

kg kg kg mm mm mm

13. HOLLOW INSULATOR HOUSING

Type and make of insulators Power frequency withstand test voltage for one minute: . Dry . Wet Flash over value . Dry . Wet 1.2/50 impulse voltage withstand capability . positive polarity . negative polarity Creepage distance, total Creepage distance, protected Weight of assembled housing

kV kV kV kV kV kV mm mm kg

14. SUPPORT INSULATOR


- 40 -

ITEM NO


Type and make of insulators Power frequency withstand test voltage for one minute: . Dry . Wet Flashover value . Dry . Wet 1.2/50 impulse voltage withstand capability . positive polarity . negative polarity Creepage distance, total Creepage distance, protected Weight of assembled insulator

kV kV kV kV kV kV mm mm kg

15. CONTACTS - Type of main contacts - Type of auxiliary contacts - Material of auxiliary contacts - Type of plating, if any - Thickness of plating - Contact pressure No. of auxiliary contacts provided: Those closed when breaker is closed Those open when breaker is closed Those adjustable

micron gm/sq.mm no. no. no.

16. OPERATING MECHANISM Opening type Closing type Force applied by charged spring for closing Time taken by motor for charging the spring from fully discharged to fully charged position Full sequence of operation Whether limit switches are provided with spring Whether spring limit switches start and stop the motor Type and material of spring employed Whether trip free Whether anti pumping device provided

kg sec yes/no yes/no yes/no yes/no

17. AUXILIARY AND CONTROL POWER SUPPLY - Normal auxiliary A.C. supply voltage - AC Voltage limits for proper operation . Maximum

Volts Volts


- 41 -

ITEM NO


. Minimum - Frequency limits for proper operation . Maximum . Minimum - Normal control circuit voltage - DC Voltage limits for proper operation . Maximum . Minimum - Power required for trip coil - Power required for closing coil

Volts Hz Hz Volts Volts Volts Watts Watts

18. LOCAL CONTROL PANEL − Material − Degree of protection − Vermin proof provisions − Weather proof provision − Dust proof provision − Ventilation provision − Thickness of sheet materials used − Overall dimensions − Total weight − Mounting arrangement

yes/no yes/no yes/no yes/no mm mm kg

19. TERMINAL CONNECTOR − Material − Bi-metallic or not − Weight − Dimensions − Size and type of conductor it can accommodate − Terminal pads silver plated or not − Thickness of silver plating

yes/no kg mm sq.mm. yes/no microns

20. CORROSION PREVENTION SYSTEM FOR CIRCUIT BREAKER AND CONTROL CABINET − Surface preparation − Rust inhibition − Zinc thickness / Paint thickness − Treatment of fasteners

microns

21. CORROSION PREVENTION SYSTEM FOR SUPPORT STRUCTURE


- 42 -

ITEM NO


− Surface preparation − Rust inhibition − Zinc thickness − Treatment of fasteners

microns

22. VACUUM CIRCUIT BREAKER SEALING. Degree of protection of circuit breaker pole enclosure. ( IEC 529, IS 13947 ) Method of sealing the circuit breaker pole enclosure.

23. CURRENT TRANSFORMER Category 1; 600-300/ 5-5-5A − Make and type of transformer − Ratio Core1. VA burden

Accuracy class Saturation factor Instrument security factor Accuracy limit factor

Core 2. VA burden

Accuracy class Saturation factor Accuracy limit factor Core 3. Accuracy class Saturation factor Accuracy limit factor Knee point voltage Magnetising current at Vk /2 Secondary resistance Rct

Short time current rating Impulse voltage withstand level Power frequency voltage withstand level • Primary winding • Secondary winding Specification of oil Quantity of oil

VA VA volts amps ohms kA, Sec. kV kV kV litres


- 43 -

ITEM NO


Creepage distance Protected creepage distance Weight of CT complete with oil CORROSION PREVENTION SYSTEM FOR CT. − Surface preparation − Rust inhibition − Paint thickness − Treatment of fasteners − Oil resistance varnish

mm mm kg micron

24. CURRENT TRANSFORMER Category 2; 400-200/ 5-5A − Make and type of transformer − Ratio Core1. VA burden

Accuracy class Saturation factor Instrument security factor Accuracy limit factor Core 2. VA burden

Accuracy class Saturation factor Accuracy limit factor Short time current rating Impulse voltage withstand level Power frequency voltage withstand level • Primary winding • Secondary winding Specification of oil Quantity of Oil Creepage distance Protected creepage distance Weight of CT with oil CORROSION PREVENTION SYSTEM FOR CT − Surface preparation − Rust inhibition − Paint thickness − Treatment of fasteners − Oil resistant varnish

VA VA kA, Sec. kV kV kV litres mm mm kg micron


- 44 -

ITEM NO


25. 1. 2.

11 kV VOLTAGE TRANSFORMER GENERAL

− Make − Type of Transformer − Rated normal voltage − Rated maximum voltage − Rated primary voltage − Rated secondary voltage − VA burden − Accuracy class − Ratio error − Phase displacement positive or negative − Saturation factor − Instrument security factor − Short time current rating

• rms value • period • peak value

− Impulse voltage withstand level − One minute power frequency voltage withstand level of primary winding − Specification of oil − Weight of oil − Weight of core and winding − Total weight − Overall dimensions − Rated voltage factor

• continuous • for 30 seconds

− Temperature rise above the ambient of 50°C − Correction factor − Partial discharge level TANK − Composition of metal

kV kV kV volts VA min kA Sec kA kV kV kg kg kg mm pC mm


- 45 -

ITEM NO


3. 4.

5.

6. 7.

− Thickness

CORE

− Material composition − Flux density at normal voltage and frequency − Lamination thickness WINDINGS

− Purity of copper used − Type of insulation

− Power frequency withstand level • secondary windings to earth • between sections

SECONDARY TERMINAL BOX - Degree of protection - Vermin proof provisions - Weather proof provision - Dust proof provision - Thickness of metal used - Overall dimensions - Mounting arrangement HV TERMINAL

- Material - Bi-metallic or not - Dimensions - Size and type of conductor it can accommodate CORROSION PREVENTION SYSTEM (To be furnished as per clause on Surface Treatment)

− Surface preparation

− Rust inhibition

− Paint thickness

− Treatment of fasteners

− Oil resisting varnish

Tesla mm percent kV kV yes/no yes/no yes/no mm mm yes/no mm sq.mm. mm


- 46 -

ITEM NO


ITEM NO


27. INSTRUMENTS & METERS ( for Relay Panel) . 1.Type & make of instruments & meters . 2. Size 3. Whether magnetically shielded or not . 4. Limits of error in the effective range . 5. Scale length. 6 Whether Tropicalised. 7. Short time overload rating 8. V.A. Burden.

Current coil Potential coil

9.Power consumption current coil & potential coil

RELAYS 1. Type & make of relay 2. current coil rating 3. Tap range 4. VA. Burden- Highest tap & Lowest tap 5. Power consumption- Highest tap &

lowest tap 6. Time of operation at maximum time dial

setting at i) 5 times tap setting current ii) 10 times tap setting

current. 7 . Type of characteristics. 8 . whether draw out type or not . 9. Trip contact ratings . Amps. 10. Wheather seal- In contacts provided or not .

microns


- 47 -

ITEM NO


POWEWR PACKS 1 Rated AC voltage .( Input 230V AC or 110 V , Out put 24 V DC , storage capacity 3 trippings even if input failed ) 2. Single phase or three phase . 3. Capacity (VA) 4. Power factor . 5. Type of transformer used, if any , to suply input to the rectifier .

6. Transformation ratio . 7. Type of rectification employed . Full

wave or half wave 8. Type of rectifier connection . 9. Ripple factor. 10. Type of filter employed. 11. Type of capacitor used . 12. Ratings of capacitor 13. Time of retention of charge by capacitor. 14. Value of DC constant. 15. Out put voltage .( DC) 16. Capacity ( watt-sec) 17. No of closing & tripping taken by this

pack. .

37. NON COMPLIANCE SCHEDULE On this schedule the bidder shall provide a list of non compliance with this specification, documenting the effects that such non compliance is likely to have on the equipment's life and operating characteristics. Each non compliance shall be referred to the relevant specification clause.


- 48 -

Where there are no deviations from specifications, the bidder shall so indicate by stating “No deviations” in this schedule.

Clause No Non Compliance


- 49 -

38. TEST CERTIFICATES SCHEDULE On this schedule a list of the test certificates included with the bid shall be provided. This list should include type test certificates and sample routine test reports. Each certificate listed shall be referred to the relevant specification clause and item of equipment to which the test applies.

Clause No Type Test Certificate or Routine Test Report

Documents

Technical Specification for11kV Breaker - … Specification for11kV... · and operation. The circuit breakers to be ... ( APDRP Scheme ) -10 - 6. CIRCUIT BREAKER ... control while