Balance of plant Specifications for 12MW Archean plant

ARCHEAN CHEMICAL INDUSTRIES PVT. LTD.

1 x 10MW NCR (12 MW MCR) CO-GENERATION

POWER PLANT

TECHNICAL SPECIFICATION FOR

BALANCE OF PLANT-ELECTRICS

DOC. NO : 4 – 3626– ELEC – 002(REV 02)

TECHNICAL SPECIFICATION

FOR

BALANCE OF PLANT - ELECTRICS

REVISION NO. R0 R1 R2

ISSUED FOR TENDER TENDER TENDER

PREPD.BY/DATE PK SHIVA SHIVA

CHKD. BY/DATE KSV LPK SKN

APPD. BY/ DATE SKN SKN SKN

Consultant:Snyder Energo Pvt. Ltd., 1 of 44Bangalore & Chennai



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DOC. NO : 4 – 3626– ELEC – 002(REV 02)

INDEX

1.0 GENERAL

2.0 SCOPE OF WORK

3.0 POWER CUM MOTOR CONTROL CENTRE (PMCC)

4.0 YARD PUMP MCC

5.0 LIGHTING SYSTEM

6.0 LT POWER AND CONTROL CABLE

7.0 EARTHING

8.0 LIGHTNING PROTECTION

9.0 TERMINAL POINTS

10.0 EXCLUSIONS

11.0 RELATED DRAWINGS

12.0 LIST OF SUB-VENDORS FOR MAJOR ITEMS –BALANCE OF PLANT (BOP- ELECTRICS)

13.0 ANNEXURE 1-SPECIFICATION FOR BATTERY, BATTERY

CHARGER

14.0 ANNEXURE-2: SPECIFICATION FOR BUS DUCTS

15.0 ANNEXURE-3:SPECIFICATIONS FOR 11kV SWITCHBOARD




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ELECTRICAL SYSTEM

15.1 GENERAL CONDITION

1.1 This section covers the design, engineering, manufacturing, inspection, and delivery at site, erection, testing, commissioning and handing over of the BOP electrical system at Hajipur, Gujarat..

1.2 The scope of work and services shall include all necessary work and supply of equipment and material whether specifically mentioned in these specifications or not, but are necessary for the satisfactory, safe operation and maintenance of the system, capable of continuous, efficient, and reliable operation with minimum maintenance under the environmental and operating conditions applicable to this power plant site.

1.3 The work shall be carried out as per the latest Indian Standards or recognized international standards. The entire electrical system shall comply with currently applicable statutes, regulation and safety codes related to design, construction and operation of the electrical items mentioned in this specification.

2.0 SCOPE OF WORK

2.1 11kV HT Switchboard Panel.

2.2 LT Bus duct from LV (433V winding) of Station Auxiliary transformer-1 to Power cum Motor Control Centre and LT Bus duct from LV (433V winding) of Station Auxiliary transformer-2.

2.3 Power Cum Motor Control Centre as per sld No.1-3626-400-003 (rev 08)2.4 The following panels shall be supplied by the BOP contractors.

MLDB & LDB’s Capacitor panel(50X12 kVAR) Control room ACDB Switchyard ACDB Yard Pump MCC

2.5 LT Power & Control Cable

LT power cables from PMCC to respective MCC’s

i) ESP-1 & ESP-2 MCC’sii) TG MCCiii) ASH MCC-1 & ASH MCC -2iv) FHS MCCv) MLDBvi) FIRE PROTECTION vii) BOILER MCC-1& BOILER MCC-2viii) COOLING TOWER MCCix) CONTROL ROOM ACDBx) SWITCHYARD ACDBxi) CAPACITOR PANEL




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DOC. NO : 4 – 3626– ELEC – 002(REV 02)

xii) AC& VENTILATION MCCxiii) BATTERY CHARGERxiv) YARD PUMP MCC

2.6 Control cables from Station Auxiliary transformer-1 to the PMCC and Auxiliary transformer-2 to the PMCC.

2.7 Cables from Battery charger DCDB to various electrical equipment shall be supplied by the tenderer.

2.8 Cable supporting structures, Pre fabricated Galvanised cable tray (Ladder type & perforated type), cable racks, inserts and other associated accessories and fire sealing materials for laying. Termination and sealing of cables are also under vendor’s scope.

2.9 Earthing system (below and above ground earthing)2.10 Lighting System (Including DC emergency lighting)2.11 Lightning Protection system.2.12 Complete structures as required for all panels and other equipment covered under this scope.

3.0 LT POWER CUM MOTOR CONTROL CENTER (PMCC)

3.1 Scope

3.1.1 The switchgears shall derive power from two numbers of 2.5 MVA Station auxiliary transformers between two transformers with one bus coupler arrangement refer as per SLD no.1-3626-400-002(rev 08) and secondary forming one source and through DG supply forming second source as per SLD no. 1-3626-400-002(rev 08).

3.2 Design Criteria for PCC

3.2.1 The switchgear shall be formed using distinct vertical sections each comprising the following compartments.

3.2.2 A completely metal enclosed horizontal bus bar compartment running horizontally at top.3.2.3 Individual feeder modules organized in multitier mode.3.2.4 The current transformers shall be of bar primary wound secondary cast resin type and have a

short time withstand rating equal to that of the associated switchgear for one second. It shall be the responsibility of the vendor to coordinate the burden of the CT’s with the actual requirements of relays, instruments, leads etc., associated with the particular CTs. The minimum requirement shall be 10 VA burden, accuracy class 0.5 and an instrument safety factor of 5.

3.2.5 Completely enclosed vertical copper (Cu) bus bars serving all feeder modules in the vertical section.

3.2.6 The panel shall be designed for an ambient temperature of 50°C and the maximum operating temperature shall not exceed 85°C.

3.2.7 The circuit breakers shall be provided with mechanically operated emergency tripping device. This device shall be available on the front of the panel. Mechanically and electrically operated `closing’ and tripping devices shall be provided. It shall be possible to remotely close and trip the circuit breaker.

3.2.8 Earth fault setting range and tripping of earth fault releases shall be 10% to 40%.3.2.9 O/L relays shall be of suitable range to match the rating of the motors protected. O/L relay shall

be selected to suit the starting time of the drive. The O/L relays shall be provided with 1 NO + 1 NC contact and shall have accelerated tripping characteristics on single phasing.




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3.2.10 All auxiliary devices for control, indication, measurement and protection such as control and selector switches, indicating lamps, ammeters, voltmeters, kWH meters protective relays shall be mounted on the front side of the respective compartment only.

3.2.11 Cable termination compartment.3.2.12 The front of the board shall comprise individually enclosed Air Break Circuit Breakers, starters,

switch fuse modules.3.2.13 All auxiliary devices for control, indication, measurement and protection such as control and

selector switches, indicating lamps, ammeters, voltmeters, energy meters, protective relays shall be mounted on the front side of the respective compartment only.

3.2.14 All air circuit breakers (ACBs) shall be provided with microprocessor based releases for earth fault, short circuit and Overcurrent moulded case circuit breakers shall be provided with static for overload, short circuit and earth fault releases.

3.2.15 For each switchgear, for breaker control 230V AC control supply shall be taken from phase and neutral. Necessary voltage monitoring contactors (for remote alarm) and indication lamps shall be provided.

3.2.16 The spare contacts of all contactors relay devices shall be wired to terminal blocks. 20 % spare terminals shall be provided for each module. For CT & VT circuits disconnecting type of terminals shall be provided.

3.2.17 All components of control gear offered shall confirm to relevant IS/IEC standards. 3.2.18 The operation, indications and fault alarms for the motors of the auxiliaries shall be displayed as

covered in the specification as part of C&I requirements.3.2.19 The Switchboard shall be suitable for the following operating system.

Rated Voltage : 415 V, 3 Ph, 4 Wire

Rated Frequency : 50 Hz

Fault Level : 50 kA for 1 sec

Enclosure : IP 52

Bus Bar material : Copper

3.3 Design Criteria for MCC

3.3.1 Medium voltage Switch board shall be dust, damp & vermin proof construction sheet steel clad totally enclosed, floor mounted, self standing type with single front compartmentalised cubicle design with single TPN bus bar arrangement with front access and rear access and with cable entry and outgoing from bottom of the switch board.

3.3.2 The panel shall be designed for an ambient temperature of 50°C and the maximum operating temperature shall not exceed 85°C.

3.3.3 All auxiliary devices for control, indication, measurement and protection such as control and selector switches, indicating lamps, ammeters, voltmeters, kWH meters protective relays shall be mounted on the front side of the respective compartment only.

3.3.4 Outgoing circuit shall have SFU. The number of outgoing circuits shall be as per the requirement and 20% spare.

3.3.5 SFU along with bi-metallic overload relay to be provided for motors up to 18.5 kW.




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3.3.6 Cold Rolled Sheet Steel of 2.5 mm thickness shall be used for all members except for doors, covers and partitions where it may be of 2 mm.

3.3.7 All components including the copper busbars shall be accessible and capable of being removed from front. The cable alleys shall also be at the front of the board.

3.3.8 All the doors for the feeder modules in the front shall have individual sheet steel hinged doors with concealed hinges, these doors shall be capable of being physically lifted off the main base shell and fixed back in position while the panel is in service without necessitating removal of any screws or welding etc and with the adjacent modules in service with their doors closed.

3.3.9 The cooper bus bar chamber shall have screwed covers at the front, on the sides and for the top.3.3.10 Removable undrilled gland plates of 3mm thick shall be provided at the bottom of the each

panel.3.3.11 Cable clamping arrangements shall be provided in the cable alley. The switchboard shall have

uniform height. 3.3.12 The copper busbar arrangement, clearance and connections shall generally conform to IS:

5578 / IS: 11533 unless otherwise specified. The busbars shall be of hard drawn high conductivity electrolytic grade copper conforming to IS: 5082. The design current density shall not exceed 1.0 A/Sq.mm. The busbars shall be suitable to withstand without damage the effect of the maximum short-circuit current of 50 kA RMS for one second.

3.3.13 The panel shall be connected to an earth busbar running throughout the length of the switchboard. The min. earth bus size shall be 300 sq.mm copper or equivalent copper.

3.3.14 Circuit breakers shall be air break, draw out type. The ratings shall be rated based on maximum connected load rating.

3.3.15 The circuit breakers shall be provided with mechanically operated emergency tripping device. This device shall be available on the front of the panel. Mechanically and electrically operated `closing’ and tripping devices shall be provided. It shall be possible to remotely close and trip the circuit breaker.

3.3.16 Earth fault setting range and tripping of earth fault releases shall be 10% to 40%.3.3.17 O/L relays shall be of suitable range to match the rating of the motors protected. O/L relay shall

be selected to suit the starting time of the drive. The O/L relays shall be provided with 1 NO + 1 NC contact and shall have accelerated tripping characteristics on single phasing.

3.3.18 Electronic motor protection relays shall be provided for motors rated 45 kW and above. The relay shall have overload, short circuit, earth fault, stalling and single phasing protective features.

3.3.19 Power interconnections inside the panel shall be done with 650/1100 V grade single core PVC insulated copper conductor up to 63 Amps rating and above 63 Amps rating by copper flats. Control wiring shall be done with 1100 V grade PVC single core copper conductor of minimum cross section 1.5 Sq.mm Power wiring shall be of minimum 2.5 Sq.mm Copper.

3.3.20 The current transformers shall be of bar primary wound secondary cast resin type and have a short time withstand rating equal to that of the associated switchgear for one second. It shall be the responsibility of the vendor to coordinate the burden of the CT’s with the actual requirements of relays, instruments, leads etc., associated with the particular CTs. The minimum requirement shall be 10 VA burden, accuracy class 0.5 and an instrument safety factor of 5.

3.3.21 The ammeters for motor feeders shall have a scale with compressed overload range so as to permit estimation of starting current of AC motor. Ammeters may be directly connected for currents upto 50 A full load current and ring type current transformer shall be used for higher currents.

4.0 YARDPUMP MCC




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4.1 Medium voltage Switch board shall be dust, damp & vermin proof construction sheet steel clad totally enclosed, floor mounted, self standing type with single front compartmentalised cubicle design with single TPN bus bar arrangement with front access and rear access and with cable entry and outgoing from bottom of the switch board.

4.2 The panel shall be designed for an ambient temperature of 50°C and the maximum operating temperature shall not exceed 85°C.

4.3 All auxiliary devices for control, indication, measurement and protection such as control and selector switches, indicating lamps, ammeters, voltmeters, kWH meters protective relays shall be mounted on the front side of the respective compartment only.

4.4 Outgoing circuit shall have SFU. The number of outgoing circuits shall be as per the requirement and 20% spare.

4.5 SFU along with bi-metallic overload relay to be provided for motors up to 18.5 kW.

4.6 Cold Rolled Sheet Steel of 2.5 mm thickness shall be used for all members except for doors, covers and partitions where it may be of 2 mm.

4.7 All components including the copper busbars shall be accessible and capable of being removed from front. The cable alleys shall also be at the front of the board.

4.8 All the doors for the feeder modules in the front shall have individual sheet steel hinged doors with concealed hinges, these doors shall be capable of being physically lifted off the main base shell and fixed back in position while the panel is in service without necessitating removal of any screws or welding etc and with the adjacent modules in service with their doors closed.

4.9 The cooper bus bar chamber shall have screwed covers at the front, on the sides and for the top.

4.10 Removable undrilled gland plates of 3mm thick shall be provided at the bottom of the each panel.

4.11 Cable clamping arrangements shall be provided in the cable alley. The switchboard shall have uniform height.

4.12 The copper busbar arrangement, clearance and connections shall generally conform to IS: 5578 / IS: 11533 unless otherwise specified. The busbars shall be of hard drawn high conductivity electrolytic grade copper conforming to IS: 5082. The design current density shall not exceed 1.0 A/Sq.mm. The busbars shall be suitable to withstand without damage the effect of the maximum short-circuit current of 50 kA RMS for one second.

4.13 The panel shall be connected to an earth busbar running throughout the length of the switchboard. The min. earth bus size shall be 300 sq.mm copper or equivalent copper.

4.14 Circuit breakers shall be air break, draw out type. The ratings shall be rated based on maximum connected load rating.




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4.15 The circuit breakers shall be provided with mechanically operated emergency tripping device. This device shall be available on the front of the panel. Mechanically and electrically operated `closing’ and tripping devices shall be provided. It shall be possible to remotely close and trip the circuit breaker.

4.16 Earth fault setting range and tripping of earth fault releases shall be 10% to 40%.

4.17 O/L relays shall be of suitable range to match the rating of the motors protected. O/L relay shall be selected to suit the starting time of the drive. The O/L relays shall be provided with 1 NO + 1 NC contact and shall have accelerated tripping characteristics on single phasing.

4.18 Electronic motor protection relays shall be provided for motors rated 45 kW and above. The relay shall have overload, short circuit, earth fault, stalling and single phasing protective features.

4.19 Power interconnections inside the panel shall be done with 650/1100 V grade single core PVC insulated copper conductor up to 63 Amps rating and above 63 Amps rating by copper flats. Control wiring shall be done with 1100 V grade PVC single core copper conductor of minimum cross section 1.5 Sq.mm Power wiring shall be of minimum 2.5 Sq.mm Copper.

4.20 The current transformers shall be of bar primary wound secondary cast resin type and have a short time withstand rating equal to that of the associated switchgear for one second. It shall be the responsibility of the vendor to coordinate the burden of the CT’s with the actual requirements of relays, instruments, leads etc., associated with the particular CTs. The minimum requirement shall be 10 VA burden, accuracy class 0.5 and an instrument safety factor of 5.

4.21 The ammeters for motor feeders shall have a scale with compressed overload range so as to permit estimation of starting current of AC motor. Ammeters may be directly connected for currents upto 50 A full load current and ring type current transformer shall be used for higher currents. Refer SLD 1-3626-400-014(rev 02).

5.0 LIGHTING SYSTEM

5.1 Scope

5.1.1 This specification covers the design, procurement, delivery, erection, testing and commissioning of complete Lighting System.

5.2 Design Criteria




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5.2.1 The lighting system design shall comply with the acceptance norms and the best engineering practices. The system design shall consider principles of lighting specified in the following paragraphs as per lighting drawings (1-3626-400-008). The lighting layout shall be designed to provide uniform illumination with minimum glare. The layout design shall meet all the statutory requirement, local rules etc.

5.2.2 Lighting system shall be provided for the entire plant covering all the buildings, outdoor areas, roads, yards, boundary, etc.,

5.2.3 Lighting fixtures with lamps and accessories for normal, AC & DC emergency lighting.5.2.4 Main Lighting distribution boards and Sub Lighting Distribution and lighting distribution

boards.5.2.5 Lighting poles / towers5.2.6 Temporary illumination system for Tenderer site.5.2.7 Required quantity of conduits, wires, lighting cables, switch boards, junction boxes, supports

and other accessories.5.2.8 Categories of Lighting5.2.9 The plant lighting system shall comprise the following categories.

Normal 230 V single phase AC lighting system Normal-cum-Emergency 230 V Single phase AC lighting system Adequate for personnel movement and also located at strategic locations. Normal and Emergency Lighting Supply Distribution System.

5.2.10 For these systems, the distribution shall be by 415 V, 3 phase, 4 wire, 50 Hz supply with effectively earthed neutral. This supply shall be derived from 415 V, 3 phase, 3 wire, 50 Hz unit service switchgear by providing a 415/433 V delta/star lighting transformer of adequate rating (Dry type).The transformer shall be Class B, EPOXY encapsulated. The secondary of lighting transformers shall be connected to 415 V 3 phase, 4 wire, AC lighting distribution boards (MLDB / LDBS). The MLDB / ELDBs will be provided with number of outgoing circuits controlled by MCBs to feed the LDB’S covering all indoor & outdoor Areas.

5.2.11 Illumination levels and choice of lighting fixtures5.2.12 The area-wise distribution of average illumination levels and type of luminaries shall be as

given below: For indoor areas CFL Lamps to be considered.5.2.13 Ceiling fans & exhaust fans5.2.14 Ceiling Fans shall be provided in all the rooms in administration block, for the security building

and other buildings where personnel are deployed for monitoring purposes.5.2.15 Exhaust fan shall be provided in Battery Room, Bath room & Toilet Area.5.2.16 Battery back up exit lights.5.2.17 On all exit doors in control room and office area, 3 hr battery back up Exit lights shall be

provided.

LIGHTING BOQ:-

AC NORMAL LIGHTING BOQ FOR TG HALL CONTROL & ELECTRICAL ROOM

S.No Type Of Lamp Quantity Spare Remarks

1Industrial General purpose luminare with stove enamelled reflector along with 2X36 watt fluorescent lamp with energy saving Electronic Ballast (EB) shall be suitable for wall mounting

134 6




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and suspension mounting.

2Comfort Mirror optics luminare having CAT II light distribution for indirect lighting along with 2X36 Watt. Compact Fluorescent lamps with energy saving Electronic Ballast (EB) suitable for falls roofing.

17 4 -

3

Industrial integral high bay luminare along with High Pressure Sodium Vapour (HPSV) Lamp 150 watt suitable for angle mounting.

20

4 -

4

Single piece deep drawn aluminium street light luminare along with high pressure sodium vapour (HPSV) Lamp 150 Watt with associated steel arms.

12 3 -

6 Flame proof fluorescent luminare suitable for 1X40 FTL rated power (53W).

10 3

5250V, 20A, 2P+E, Industrial socket with 10A, SPN, MCB in sheet steel enclosure. 12 4 -

AC NORMAL LIGHTING BOQ FOR BOILER HOUSE -1& BOILER HOUSE -2

11x70W HPSV integral Industrial well glass fitting with access.(with integral starter).

76 14 -

AC NORMAL LIGHTING BOQ FOR ESP-1& ESP -2

11x70W HPSV integral Industrial well glass fitting with access.(with integral starter).

44 16 -

DC LIGHTING

4.2.18 Control room shall be provided with DC lighting 1x18W CFL suitable for working on 110V DC supply .These lamps shall be switched on automatically during total failure of Ac supply to lighting system.

4.2.19 Exit lights connected to DC lighting system shall be provided on all exit doors.

DC EMERGENCY LIGHTING BOQS.No. TYPEOF LAMP QUANTITY SPARE




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1

Decorative bulkhead luminare along with 1X18 watt compact Fluorescent Lamp suitable for 110V DC.

15 1

NOTE:1. Detailed bill of material catalogue to be provided for each type of lamp.2. The Quantity mentioned above is approximate. The contractor has to workout the actual

quantity required based on attached layouts.

6.0 LT POWER AND CONTROL CABLE

6.1 Scope

6.1.1 This specification covers the design, procurement, shop testing, inspection, packing, delivery and installation at Project Site of LT Power and Control cables required as mentioned in the electrical scope of work.

6.2 Design Criteria

6.2.1 All the power cables shall have XLPE insulation with FRLS and PVC outer sheathing.

6.2.2 Maximum temperature of conductor for continuous operation of cables shall not be more than 90C for cross linked polyethylene insulated cables. Temperature rise on short circuit conditions should be 250 C.

6.2.3 The cable shall be able to carry the full load current of the circuit continuously under the specified ambient temperature and other conditions of installation. For this purpose, suitable derating factors shall be considered due to:

Thermal resistivity of soil Ambient ground / air temperature Derating factor for grouping of cables over the current ratings at normal conditions

given in standards.

6.2.4 The cables for circuit breaker controlled circuits shall withstand the fault currents for the following fault clearing times.

6.2.5 Voltage drop in cables between PMCC and MCC for full load current shall be limited to 2%. Further, the voltage drop in cables between PMCC / MCC to the motor terminals for full load motor current shall be limited to 3%. However, these voltage drops may be adjusted in specific cases so that total voltage drop is within 5%.

6.2.6 The voltage dip from PCC to the motor terminals during starting of individual 415V motors shall be limited to less than 15% of the full load voltage.

6.2.7 The outer sheath of the cable shall be provided by extrusion over the armouring and shall be of fire retardant low smoke(FRLS) type PVC compound confirming to the requirements of type




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ST2 compound of IS: 5831. To protect the cable against rodent and termite attack, suitable anti radent chemicals shall be added into the PVC compound of the outer sheath.

6.2.8 The cable shall be supplied in standard drum lengths.

6.2.9 All the cables shown in the below cables table shall be Copper only.

SI. No. From To Cable sizeNo. of Runs

Length per Run in Meters

Total length

1 PCC Boiler MCC-1 3.5Cx240 Sq.mm 8 20 160

2 PCC Boiler MCC-2 3.5Cx240 Sq.mm 8 30 2403 PCC TG MCC 300sqmm 2 50 100

4 PCC ESP MCC-13.5Cx150 Sq.mm 4 80 320

5 ESP MCC-23.5Cx150 Sq.mm 4 80 320

6 PCC AHS MCC-1 3Cx300Sq.mm 2 80 1607 AHS MCC-2 3Cx300 Sq.mm 2 80 1608 PCC FHS MCC 3Cx300 Sq.mm 2 50 100

9 PCCCooling Tower MCC 3Cx300 Sq.mm 3 50 150

10 PCC Switchyard ACDB 3.5Cx35 Sq.mm 1 30 30

11 PCCFire Protection MCC 3.5Cx240 Sq.mm 1 35 35

12 PCCAC & Ventilation MCC 3.5x25 Sq.mm 1 40 40

13 PCCMain Lighting Distribution Board 3.5Cx35 Sq.mm 1 50 50

14 PCCControl Room ACDB 3.5Cx35 Sq.mm 1 50 50

15 PCC Capacitor Panel 3Cx300 Sq.mm 2 50 100




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16 PCC Yard Pump MCC 3.5CX300 Sq.mm 5 75 375

17 YARD PUMP MCC MCWP PUMP-1 3.5Cx120 Sq.mm 2 50 100



20 YARD PUMP MCC ACWP PUMP-1 3.5Cx95 Sq.mm 1 100 200

21 YARD PUMP MCC ACWP PUMP-2 3.5Cx95 Sq.mm 1 100 200

22 YARD PUMP MCC DMWIFP PUMP-1 3.5CX50Sq.mm 1 100 200

23 YARD PUMP MCC WW N PIT-1 3.5CX35Sq.mm 1 100 200

24 YARD PUMP MCC WW N PIT-2 3.5CX35Sq.mm 1 100 200

25 YARD PUMP MCC DMWTP-1 3.5CX25Sq.mm 1 100 200

26 YARD PUMP MCC DMWTP-1 3.5CX25Sq.mm 1 100 200

]27 YARD PUMP MCC CTMP-1 3.5CX10Sq.mm 1 100 200

28 YARD PUMP MCC CTMP-2 3.5CX10Sq.mm 1 100 200

6.2.10 The scope shall also include cable tray / tracks, cable termination kits, cable lugs, armour clamps, cable glands, identification tags, insulating tapes and compounds, sleeves, supporting structure, bolts, nuts washers and all other installation materials. Cable trays shall be of galvanized ladder / perforated type.

6.2.11 Cabling from DCS to MCC & from MCC to DCS

6.2.12 All cabling from LPBS to Yard Pump Motors shall be in vendor scope of supply.

7.0 EARTHING

7.1 The earthing protective systems shall comply standards specified in the earthing technical particulars and also with all currently applicable standards, regulations and safety codes of the locality where the installation is to be carried out.

7.2 The Tenderer shall carryout the earthing of all equipment / panels / structures as mentioned in the scope of supply and below ground earthing for withstanding the system fault current. The tenderer shall supply and install the earthing conductors & electrodes for various equipments, as per Earthing Drawings (1-3626-400-006&1-3626-400-007) hardware fittings, earthing of fence-gate post, operating handles of isolators & earthing of equipment on moving platforms etc,.

7.3 The scope of installation of electrodes shall be connected such as directly in earth, in constructed earth pits, and connecting to main buried earth grid, as per relevant standards. The scope of work shall include excavation, construction of the earth pits including all materials required for construction of the earth pits, placing the rod, providing & fixing test links on those rods in test pits and connecting to main earth grid conductors.

7.4 Neutral point of a power transformer shall be connected to 2 separate earth electrodes for connection with earthing system. Transformer track rails shall be bonded with the rail boards & connected to the earthing system.




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7.5 The electrodes to be provided shall comprise CI pipes of 100mm nominal diameter and 3m long as per IS: 3043..

7.6 Removable cap shall be provided at the top of the pipe to facilitate pouring of water. Suitable clamps shall be provided for connecting earth conductors.

7.7 The top of the electrodes shall be about 100mm below ground level while connection to the earth conductor shall be made about 150mm below ground level.

7.8 The top portion of the electrode shall be enclosed in 300 x 300 x 300 mm M15 concrete housing and provided with concrete top cover and marker. Provision shall be made at each earth station for testing earth resistance. Each earth station shall be complete with alternative layer of coke and salt as per IS: 3043.

7.9 A separate earth electrode shall be provided adjacent to structures supporting lightning arrestors. Earth connection shall be as short and as straight as practicable. For arrestors mounted near transformers, earth conductors shall be located clear of the tank and coolers.

7.10 The Tenderer shall ensure the continuity of all conductors and joints. The Purchaser may ask for earth continuity tests, earth resistance measurements and other tests which in his opinion are necessary to prove that the system is in accordance with the design, specifications, code of practice and Electricity Rules. The Supplier shall have to bear the cost of all such tests.

Equipment Parameters Technical Particulars

StandardsIS 3043, IS 2309, IEEE - 80 guide for safety in AC substation grounding,

Below ground earthing and Earthing of 11kV outdoor switchyard equipments viz., Isolator, lightning arrestor and indoor control panel etc.

a) Earthing mat shall be designed as per IEEE-80 standard.

b) Earth electrodes shall be with 100 dia Cast Iron earth electrode along with accessories as per IS 3043.

c) GI conductor size shall be selected based on fault level of the system.

d) Combined earth resistance of the system shall be less than one ohm.

7.11 Earthing (Below ground & above ground).

7.12 Preliminary calculations show that no of earth pits are required foe the earthing system. The number of earth electrodes indicated is tentative and minimum required contractor after measuring the soil resistivity at site shall work our number of electrodes required in order to obtain resistance if earthing system to be less than one Ohm and provide earth electrode accordingly. Tenderer shall demonstrate that resistance of earthing system is less than one Ohm.

EARTHING BOQ:-

S.No.

DescriptionConductor

NameConducto

r SizeQuantity

Unit




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1Earth pit ( Body Earthing )

( Placed 1.5m from Building )CI Pipe

100mm Dia. 3m long

25 No's

2Earth pit ( Electronic , Neutral

and lightining arrestor )( Placed 1.5m from Building )

CI Pipe50mm Dia, 3m long, CI Pipe

12 No's

CU plate1200 X 1200 X

12 CU Plate12 No's

3Main Earth mat laid below

600mmMS 75mm x 16mm 900 Meter

4 Auxiliary Earth conductor GI Flat 50mm x 6mm 500 Meter

5Earthing conductor for LT

switchboards, MCCs, ACDB etcGI Flat 50mm x 6mm 150 Meter

6 Equipment Earthing Conductor GI Flat 25mm x 3mm 25 Meter7 Electronic Earthing Conductor Copper Cable 16 Sq.mm 100 Meter8 Vertical Riser GI Flat 50mm x 6mm 80 Meter

9 Test LinkTo be installed at 1200m above

FGL6 No's

LEGEND:-GI -- Galvanised IronMS – Mild SteelCI -- Cast IronDia – DiameterSq.mm – Square millimetremm – millimetreNOTE:-1. Please refer Typical Earthing Drawings and legends for other accessories. 2. Please refer to Drawing No: 1-3626-400-006 and 1-3626-400-007.

8.0 LIGHTNING PROTECTION

8.1 All buildings and plant structures shall be protected against atmospheric flash over and lightning strokes in such a manner as to eliminate any danger to the personnel employed there in. Stipulations of IS: 2309-1969 shall be followed.

8.2 A ‘Faraday Cage’ made of galvanised steel strip connected to all buried pipes and steel structures crossing this cage ring shall be laid around each man building or plant unit as earthing device.

8.3 Main plant buildings/structures shall be provided with lightning protection.8.4 Design shall be as per the standard IS 2309 (latest revision) and Indian Electricity Rules.8.5 All lightning arrestor earth leads of the buildings and plant units shall be connected to this cage

ring.8.6 Air termination network should cover all the salient points of the structure. All metallic

structures, ducts and the like above the roof of the structure shall be bonded to and form part of the air termination network. Vertical air termination points shall project at least 30 cm above the object on which it is fixed.




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8.7 Down conductors shall follow the most direct path possible between air termination and earth termination avoiding sharp bends. Down conductor shall have a testing point adjacent to the earth electrode. Each conductor shall have an independent earth termination. All earth terminations shall be interconnected.

8.8 Earthing electrodes and grid for lightning protection will be distinct separate from the earthing system for earthing of electrical equipment and at no place will be connected to other earthing system.

LIGHTNING BOQ:-

S.No. DescriptionConductor Name Conductor Size Quantity Unit

1

Down Conductors in Lightning Protection Syatem GS Strip 25mm x 3mm 200 Meter

2

Air Termination Network transverse conductor GS Strip 25mm x 3mm 100 Meter

9.0 TERMINAL POINTS

11kV Switchboard panel.

PCC outgoing feeders.

10.0 EXCLUSIONS

Switchyard at Pump House

Plant end Switchyard

Cable from 11kV switchboard to DG switchboard

Cable from 11kV switchboard to plant end switchyard

Boiler MCC, TG MCC, ESP MCC, AHS MCC, FHS MCC, and Cooling Tower MCC.

Cabling from MCC to respective Motors (Except Yard Pump).

Station Auxiliary transformer 1 & 2.

11.0 RELATED DRAWINGS

SL. NO. DRAWING NO. DESCRIPTION

1 1-3626-100-001 PLOT PLAN2 1-3626-400-002 (REV 08) SINGLE LINE DIAGRAM3 1-3626-400-008

(SHEET 1of 2)LIGHTING FOR TG BUILDING




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4 1-3626-400-008 (SHEET 2 of 2)

LIGHITING FOR MLDB’S&LDB’S

5

BL017-30-04-0-003, BL017-30-04-0-004 ,BL017-30-04-0-005 & BL017-30-04-0-006

LIGHTING LAYOUT FOR BOILER-1 AND BOILER-2

6 BL017-00-12-1-018 & BL08-00-12-1-018

LIGHTING LAYOUT FOR ESP-1& ESP-2

7 1-3626-400-007(SHEET 1) TG BUILDING EARTHING LAYOUT8 1-3626-400-007(SHEET 2) EARTH PIT DETAILS9 1-3626-400-006(REV 01)

SHEET 1OVERALL PLANT EARTHING LAYOUT

10 1-3626-400-006(REV 01) SHEET 2

EARTH PIT DETAILS

11 2-3626-400-014(REV 02) SINGLE LINE DIAGRAM FOR YARD PUMP MCC12 1-3626-400-013(REV

02)SHEET 1BUSDUCT AND CABLE TRAY ROUTING (PLAN VIEW)

13 1-3626-400-013(REV 02)SHEET 2

BUSDUCT AND CABLE TRAY ROUTING (SECTIONAL VIEW)

14 1-3626-400-013(REV 02)SHEET 3

BUSDUCT AND CABLE TRAY ROUTING (CABLE TRAY DETAILS)

12.0 LIST OF SUB-VENDORS FOR MAJOR ITEMS –BALANCE OF PLANT (BOP)

ELECTRICALSI.No. ITEM MAKE

1 TRANSFORMER AREVA / CGL / BHARAT BIJLEE LIMITED

2 ON LOAD TAP CHANGER CTR / OLG

3 RELAYS ALSTOM / ABB

4 33kV SF6 BREAKERARORA / VOLTAMP / UNIVERSAL / VIJAY / TRANSFORMER & RECTIFIER

5 LIGHTNING ARRESTOR ALSTOM / ELPRO / OBLUM / CGL

6 ISOLATOR S&S / SMC / BIMCO / KOUSIK / BERSATCK

7 INSULATORS WS / JAYASHREE / MODERN / IEC

8 33KV SWITCHGEAR ABB / SIEMENS / AREVA

9CABLES HT & LT POWER / CONTROL

RPG / CCI / NICCO / UNIVERSAL / FORT GLOSTER / POLYCAB / KEI / CORD




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10 LT BUSDUCTCONTROLS & SWITCHGEAR (C&S) / STAR DRIVE / INTERLEC / BEST & CROMPTON / ENPRO / IKE ELECTRIC PVT. LTD.

11 LT SWITCHGEAR COMPONENTS L&T / SIEMENS / SCHNEIDER

12 415V PCCSIEMENS / L&T / SCHNEIDER / CONTROL SCHEMATIC / ELTECH / SEN & SINGH / RK ELECTRICALS / ELECMECH

13LT SWICHGEAR (415V PMCC'S, MCC, MLDB, ELDB, LP’s, ELP’s & ACDB & DCDB

IKE ELECTRIC PVT. LTD. / VIDHYUT / SYSTEM HOUSEPANEL OF SIEMENS / L&T / SCHNEIDER / ELMECH / ELEMECH / RKELECTRICALS

14CT & PT (11KV PANEL MOUNTED TYPE)

AE / PRAGATI / KAPPA / CURRENT / PRAYAG / SILICAANS

15 VSD DRIVES

SIEMENS / ABB / ROCKWELL INDUSTRIES / AREVA / L&T / BHEL / SCHNEIDER / CGL / WE-POWER / EUROTHERM / CONTROL TECHNIQUE

16 HRC FUSES HT AREVA / SIEMENS / S&S / ABB

17NUMERICAL MOTOR PROTECTION RELAY

L&T / SIEMENS / AREVA / ER / ABB / GE

18 RELAY & CONTROL PANELAREVA / ELPRO / EASUN REYROLLE / ENPRO / ABB / SIEMENS / VEE VEE CONTROL / EIC / SCNEIDER

19CONTROL TRANSFORMER (PANEL YPE)

KAPPA / INDCOIL / PRAGATHI / SIEMENS / INTRANS

20 CONTACTOR - ALL TYPESCHNEIDER / SIEMENS / ABB / GE POWER / L&T

21 ELCBSIEMENS / INDOKOPP / HANGER / GE POWER / ALSTOM / MDS

22 FIBRE OPTIC CABLE DELTON / RUKLICA / RPG / MOLEXLK

23 HOOTER KHERAJ / UNIVERSAL / ELECTRIC / KAKKU

24 HRC FUSES SIEMENS / AREVA / L&T / ABB / GE POWER

25 MCBSIEMENS / STANDARD / MDS / INDOKOPP / SCHNEIDER / HANGER

26 MCB DBSIEMENS / STANDARD / MDS / INDOKOPP / GE

27 MCCB SIEMENS / GE POWER / L&T / ABB

28OVERLOAD RELAY WITH SPP FEATURE

BCH / L&T / SIEMENS / GE POWER

29INDICATION LAMP (CLUSTER LED TYPE)

L&T / SIEMENS / VAOSHNO / TECHNIC / BINAY / SCHNEIDER




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30 METERS AE / RISHAB / L&T / MECO

31 METERS (DIGITAL) L&T / SEMS / ENERCON / RISHAB

32MULTI FUNCTIONAL METERS / TRI-VECTOR METER WITH RS-485 PORT MODBUS PROTOCOL

L&T / SEMS / ENERCON

33PF & FREQUENCY METER (DIGITAL)

AE / AMP / MECO / RISHAB

34 PUSH BOTTONS SIEMENS / BCH / L&T / TECHNIC / KAYCEE

35 PUSH BOTTON STATIONSIEMENS / BCH / L&T / TECHNIC / DEVI POLYMERS

36 TERMINAL BLOCKELMEX / CONNECTWELL / DOWELLS / WAGO / PHONIX

37 TIMER SIEMENS / BCH / L&T / ABB / AG SYSTEMS

38 TRANSDUCER AE / ABB / AREVA / MECO

39 AMMETER / VOLTMETER AE / IMP/ MECO / L&T

40 CONTROL PANELSIEMENS / AREVA / ENPRO / ELPRO / EASUN

41 BATTERY (PLANTE TYPE ) EXIDE / HBL NIFE / AMARARAJA

42 BATTERY CHARGERCALDYNE / AMARARAJA / KAYBEE POWERELEC / UNIVERSAL INSTRUMENTS / PB ELECTRONICS

43 CABLE TERMINATION HT RAYCHEM / MSEAL / DENSON / CCI

44CABLES (LT POWER & CONTROL)

RPG / CCI / NICCO / UNIVERSAL / FORT GLOSTER / POLYCAB / KEI / CORD

45 LIGHTING FIXTURES PHILIPS / CGL / BAJAJ / WIPRO

46 CABLE TRAYSINDIANA / STEELMITE ENGINEERING / PATNY / EQUIVALENT

47 EARHING MATERIALSDY ENGINEERS / INDIA ELECTRICAL SYNDICATE / PATNY

48 UPSGUJRAT HI - REL / SIEMENS / EMERSON / KEC / NIMERIC / L&T / POWER COM




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ANNEXURE - 1

13.0 SPECIFICATIONS FOR BATTERY AND BATTERY CHARGER

13.1 Scope

13.1.1 The work to be performed under this specification consists of design, manufacture, testing, and delivery, installation, commissioning and guaranteeing the successful operation of the following.

a. Valve Regulated Lead-Acid (VRLA) rechargeable battery, Heavy-duty

b. Battery charger consisting two nos. (2) Of float cum boost chargers

13.2 Battery Unit

13.2.1 General

The equipment offered shall be complete with all parts are usual for the efficient operation, whether specifically mentioned or not. The construction shall be generally rugged and tough. The battery shall withstand high rate of discharge or over boost charge, accidental shorting and polarity reversals and severe shock & vibration.

13.2.2 Codes and Standards

The battery covered by this specification shall be built to generally conform to the latest revision of IEC: 60896-2. The design, manufacture and performance of equipment comply with all currently applicable laws, regulations and safety course in the locality where the equipment will be installed. Nothing in this shall be conserved to relieve SUPPLIER of this responsibility.

13.2.3 Technical Specification / requirements

1. Type application : Valve Regulated Lead-Acid (VRLA) rechargeable battery, Heavy-duty

2. Type of installation : Stationary

3. Performance : Long life batteries. Meantime beforeFailure should be about 10 years. Normal life span about 20 years.

4. AH efficiency : Better than 90%

5. Self discharge/week. : 0.5 to 1% of rated capacity.




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6. Ambient temperature (max)

: 50°C

7. Terminal Posts : Shall be of solid brass and adequately dimensioned for strong construction with least Electrical resistance

8. Type of connector : Heavy duty copper

9. Plates : The plates shall be of flat pasted, first class material and workmanship and shall be free from blow holes, cracks and other imperfections.

The positive plate shall consist of a suitable bar with spines cast of suitably alloyed lead to give adequate mechanical strength. The construction and material shall be such as to reduce loss of active material to the minimum and to withstand normal internal stresses developed during service. Negative plate shall be of the pasted type and of adequate mechanical strength.

10. Separating grills : The separators shall be impervious of the chemical action inside the cell and oxidation resistant. These shall be provided to separate the plates and insulate the plate from one another. The grills at the same time shall allow free circulation of electrolyte between plates. These materials shall be inert to react with electrolyte.

11. Capacity : The battery shall be of 110V,100AH sized for the following discharge cycle

a. 1 min.momentary loadb. 1 hour emergency load (including EOP motor load) plus 20A emergency lighting loadc. 10 hour continuous load of all TG auxiliary requirements plus 25A plant control & misc.loadsd. Derating factors, as per manufacturer’s recommendations, shall be considered for Sizing of the batteries.

12. DC system : Unearthed

13. Normal Voltage : 110 V

14. Full boost charge Voltage : 121 V

15. Fully discharged Voltage : 99 V

16. Boost charge current : To be decided by SUPPLIER




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17. Total number of cells : To suit the application

18. Terminal Posts : Terminal posts shall be designed to accommodate external bolted connection conveniently and positively. Each terminal posts shall have two bolt holes of the same diameter, preferably at right angles to each other.

19. Electrolyte : Electrolyte shall be sulphuric acid of specific gravity 1.160 / 1.180

20. Container : The containers shall be made from Poly propylene co-polymer material. They shall be sufficiently robust and free from flaws with leak proof.

21. Safety Vent : Shall be self resealing with flame arrestor

13.2.4 Accessories

The battery shall preferably be complete with all devices required including the following:

a. Battery racks

These shall be constructed from good quality teakwood and painted with two coats of approved acid resisting paint. The construction of the racks, unless otherwise mentioned shall be suitable for fixing to a flat concrete floor. The racks shall be rigid, free standby type and free from warp. The complete racks shall be suitable for being bolted end to end to form a continuous row. Stacking arrangement shall be to occupy less room space.

b. Porcelain insulators, rubber pads etc.

c. Set of inter cell, inter-tier and inter bank connectors as required for the complete installation

d. Accessories for testing and maintenance

- One set terminals and cable boxes with glands for connecting cable as required- One set spare connectors

- One set spare nuts & bolts

- Suitable set of spanners

13.2.5 Tests

13.2.5.1 Routine tests and type tests (on at least four random samples) shall be carried out and test certificates shall be furnished.




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13.2.5.2 All acceptance tests as per IEC shall be carried out at site.

13.3 Battery Charger

13.3.1 The equipment shall comply with the following standards.

IS 1248 : Direct acting electrical indicating instruments

IS 3715 : Letter symbols for semi-conducting devices(Part 1 to 4)

IS 4411 : Code for designation of semi-conductor devices

IS 5469 : Code of practice for the use of semi-conductor Junction (part 1 to 3) devices

IS 7204 : Stabilised power supplies D.C. Output(Part 1 to 4)

IS 12021 : Control transformers for switchgear and control Gear for voltages not exceeding 1000V AC

IS 13314 : Solid state inverters run from storage batteries

IS 13703 : Low voltage fuses for voltage not exceeding 1000V AC or (part 1 to 4) 1500V AC

IS 13947 : Specification for low voltage switchgear and Control gear (part-4/Sec-1)

IEC 60146 : Semiconductor converters.

13.3.2 In case Indian standards are not available for any equipment, standards IEC/BS/VDE/IEEE/NEEMA or equivalent shall apply.

13.3.3 Technical Requirements

13.3.3.1 The battery charger shall be an integrated system comprising of static rectifiers, DC Distribution Board, isolating and protection devices and all other equipment / accessories required for completeness of the system.

13.3.3.2 The battery chargers shall be suitable for input power supply of 415V +10%, 3 Phase 50 Hz and frequency of 50 Hz + 5%

13.3.3.3 The battery charger shall be suitable for installation and satisfactory operation in a pressurised or non-pressurised room with restricted natural air ventilation. The design ambient temperature shall be 45 Deg C and altitude not exceeding 1000 m above MSL.

13.3.3.4 The battery charger assembly shall have an height of 2325 mm with base channel of 100 mm.




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13.3.4 System Operation

13.3.4.1 The battery chargers #1 and #2 shall operate in parallel feeding the DC load and flow charging the batteries under normal operation. However, in case of failure of either of the chargers, the other charger shall float charge the battery while feeding the complete DC load. In case of AC mains failure, the battery shall continue to supply the load.

13.3.4.2 The process of change over from float to boost charging and from boost to float charging shall be selectable by an auto / manual selector switch. In auto mode, the change over shall be initiated through a current sensor. In manual mode, the change over shall be performed manually using push buttons. Manual switch shall have priority over automatic switching. When boost charging mode is selected, the battery shall be charged by constant current mode or by constant voltage mode as per battery manufacturer’s recommendation. Selection of constant current mode or constant voltage mode shall be fully automatic. A digital timer shall be provided for initiating the change over to float mode by default after a preset time period.

13.3.4.3 In the event of failure of the charger feeding the load, when battery is being boost charged by the other charger, DC supply to the loads shall be maintained from the battery through tap cell (if required) or through a contactor.

13.3.4.4 Interlock shall be provided in each charger to disconnect the charger from both the DC load and the charger operating under float mode.

13.4 Design Basis 13.4.1 Each charger shall be sized for the most stringent of the following duty conditions, whichever is

higher:

a. The charger shall be sized considering off line boost charging current in Amps of 0.2 Ah (C10) of VRLA battery.

b. With on line float charging of battery, the charger current in Amps shall be 1.15 x Average DC load + Float charging current.The loading conditions shall be as elaborated in battery specifications.

c. Initial charging of uncharged battery assembly to fully charged condition.

13.4.2 Silicon blocking diodes shall be provided in the charger output circuit to prevent back-feed from battery into the charger and filters.

13.4.3 Filter circuits consisting of smoothing choke and condenser to limit the ripple content at the output to the maximum of 1/2 - 1% of the DC voltage.

13.4.4 Protection against reverse battery connection and DC earth fault relay shall be provided.

13.4.5 Internal cooling shall be preferably by natural ventilation. If forced air cooling is considered, a redundant air cooling fan shall be provided.




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13.4.6 All electronic power devices like thyristor, transistors, diodes etc. shall be rated under operating conditions for at least 150% of the maximum current carried by the device. All electrical components such as transformers, reactors, contactors, switches, busbars etc. shall be rated for at least 125% of the maximum required rating. No electronic device shall experience a PIV greater than 50% of its rated value.

13.4.7 The DC system shall be unearthed. However, a high impedance earth fault relay shall be provided for the protection of the battery.

13.5 Charger Performance 13.5.1 The automatic voltage regulating equipment shall regulate the battery voltage within +1% of the

set value from no load to full load for AC voltage and frequency variation of +10% and +5% respectively.

13.5.2 The output voltage dynamic response of the charger unit with battery disconnected shall not vary more than +10% of nominal output voltage in the event of step load of upto 50% of the rated output. The output voltage shall be restored within the steady state limits within 250 msec.

13.5.3 The maximum noise level from the charges measured at 1 metre distance in any position, at any load between 0-100% shall not exceed 75 dB (A).

13.6 Controls

The controls shall be provided but not limited to the following:

a. ON / OFF control switch for AC supply to charger (push buttons are not acceptable)b. Push buttons for float and boost charging mode selectionc. Potentiometers under float mode for voltage and current adjustmentd. Potentiometers under boost mode for voltage and current adjustmente. Auto / manual selector switch to select mode of operationf. Others as required.

13.7 Charger Panel Metering and Indication

These shall include but limited to the following:

a. Meters

Charger -1- AC input Voltmeter with selector switch- AC input Ammeter with selector switch- DC output Voltmeter- DC output Ammeter- DC Voltmeter with selector switch (battery voltage)- DC Ammeter (battery)




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- DC Earth leakage Ammeter (mA).

Charger -2- AC input Voltmeter with selector switch- AC input Ammeter with selector switch- DC output Voltmeter- DC output Ammeter

b. Lamps

Chargers - 1 & 2- AC power ON (1 lamp for each phase)- Float charger ON- Quick charger ON- Charger fault

13.8 Alarms & Protections

Following annunciations shall be provided and also potential free contacts for the following shall be made available for hooking up to annunciation and control panel:

- DC under voltage- DC over voltage- DC earth leakage- AC incoming power supply failure- AC input fuse blown-off- Thyristor / diode failure- DC output fuse blown-off- DC battery fuses blown-off- Filter capacitor fuse blown-off- Short circuit- Reverse Polarity- Battery current limiter

13.9 Charging Panel

13.9.1 The charger shall be fabricated with 2.0 / 2.5 mm thick sheet steel and structural steel. It shall be free-standing with suitable louvers for ventilation and must be suitable for use in tropical climate. Hinged doors shall be provided at the front and back where required.

13.9.2 Inter panel sheet steel barriers shall be provided. The sheet steel used for fabrication shall be thoroughly cleaned and degreased to remove mill scale, rust, grease and dirt. Fabricated structures shall be pickled and then rinsed to remove any trace of acid.

13.9.3 All instruments shall be switchboard type & back connected. Stranded copper wires 2.5 sq. minimum shall be used for secondary wiring. The insulation for all equipment where provided shall be heat resistant, moisture proof and tropicalised. All fuses shall be provided inside the




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panel. All fuses shall be link type. Dazed fuses will not be acceptable. Terminal blocks shall be `Elmex' type.

13.9.4 All potential free metallic parts shall be earthed with soft drawn copper conductor. An earth bus of 25 x 6 mm Sq.Cu. (or equivalent Al.) Shall run through the panel. The main earth connection shall be brought out to two terminals for connection to station earthing system.

13.9.5 All live parts shall be properly shrouded. This shall ensure complete safety to personnel intending routine maintenance by opening the panel doors. Busbars shall be colour coded. All the equipment inside the panel shall have suitable name plates.

13.10 Mechanical Requirements

13.10.1 The battery charger set shall be assembled in a free standing type sheet metal cubicle completely wired for indoor installation.

13.10.2 Access to internal equipment shall be through a hinged door equipped with latches.

13.10.3 Louvers shall be provided for ventilation as necessary the ventilation openings shall be screened to prevent access to insects and other foreign material.

13.10.4 The charger compartment shall be provided with a door operated light, 11W CFL for internal illumination.

13.11 Painting

1.11.1 Painting shall include at least one coat of anti corrosive prime, one coat of finishing under coat and two coats of flint / pebble grey, shade RAL 7032. The painting shall have to render the surface scratch resistant.

13.12 Tests

13.12.1 Di-electric Tests:

a. A DC voltage equal to 2U + 1,000 V where U represents the highest input or output voltage. This voltage shall be applied to the two interconnected output terminals.

b. An AC voltage equal to 500 V applied between the live parts of the low voltage circuits and the rack.

13.12.2 Heat Run Tests:

Each of the two chargers shall be subjected to heat run test at rated load and voltage for a period not less than 8 hours. The other charger during this test shall be energised under zero load current condition. The temperature of electronic power devices shall be measured and the device junction temperature shall be calculated.




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13.12.3 Functional Tests:

Following functional test shall be carried out at charger:

a. Floating and boost voltage regulationb. Check of current limitc. Check of change - over operation by simulation of chargers failured. Operation of alarmse. Measure of ripple voltage at zero and full load.

13.12.4 Parallel Operation

Parallel operation of both chargers, sharing of the load and automatic isolation of faulty charger shall be checked.

13.12.5 Charger efficiency

Efficiency shall be determined by measurement the active power input and output of 50%, 75% and 100% load.

13.12.6 Noise Tests

Audible noise shall be measured at one meter distance in at least 4-5 positions shall be measured and shall be within the permissible limits.

13.13 Packing and Despatch

The equipment shall be properly packed for transportation by ship / rail or trailer. As the equipment may be stored outdoors for long periods before installation, the packing shall be suitable for outdoor storage under severe temperature conditions.

13.14 Drawings / Documents to be submitted

13.14.1 GA drawing of Battery Assembly and charger

13.14.2 Charger circuit drawing

13.14.3 A write up on parallel operation of the chargers

13.14.4 Commissioning, operating and maintenance instructions

13.14.5 List of recommended spares.




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ANNEXURE-2

14.0 SPECIFICATION FOR BUS DUCTS

14.1 Scope

This section of the specification covers the technical requirements of 2 sets of 433V bus duct for connecting two individual 2.5MVA Station Auxiliary Transformer (SAT) located outside the power house to the power control centre board located inside the power house which is placed in 3m level PCC/MCC room.

14.2 Technical Data Sheets (TDS) and Drawings

The bus duct shall conform to the technical parameters of the following technical specification and data sheet and the enclosed drawing.

14.3 Bus Enclosure

14.3.1 Material

The enclosure shall be made of steel or aluminium alloy as specified in Technical Data Sheet.

14.3.2 Construction

The entire bus duct shall be designed for outdoor installation with a dust and vermin-proof construction. Bus duct installations meant for outdoor application shall be of weather proof construction and shall have degree of protection better than or equal to IP-55. Outdoor portion of bus duct shall be provided with rain hood. Busduct designed for indoor installation with dust and vermin proof construction. Busduct shall have degree of protection better than or equal to IP-52.

14.3.3 Painting

The inside of the bus enclosure shall be treated with a matt paint of dark colour, preferably black to facilitate efficient heat dissipation. The bare enclosure with above painting shall be designed so as not to exceed the temperature specified. Bus conductor shall be given a coat of black mat paint. Phase identification by colour at ends and at regular intervals. Two coats of epoxy paint for outdoor and synthetic enamel paint for indoor application, preceded by de-rusting, cleaning chemically, degreasing, pickling in acid, cold rinsing, phosphating, passivating and spraying with two coats of zinc oxide primer.

14.3.4 Bellow Joints

Joints consisting of metallic expansion bellows shall be provided on the bus enclosure at following points:

(a) At terminations at transformers

(b) At terminations at switchgear cubicles




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(c) In the run of the bus duct in case of long lengths as required by design.

14.3.5 Flexible Expansion Joints

Flexible expansion joints for the enclosure shall be provided in the run of the bus duct asrequired. The flexible joints shall take care of expansion and contraction due to temperature variations and fault conditions. Copper flexible busbars shall be tinned. Copper flexible connections for termination on equipment and on expansion joints.

14.3.6 Bonding

Necessary bonding shall be provided at the above expansion joints if joints are made of insulating material.

14.3.7 Terminal Enclosures and Flanges

14.3.7.1 Three-phase terminal enclosures shall be provided with flanged ends with drilling dimensions to suit the flange at equipment terminals.

14.3.7.2 The flanges shall be provided with gaskets, nuts, bolts etc.

14.3.8 Inspection Covers

Provision shall be made for periodic inspection of insulators by means of inspection covers. The inspection covers shall be provided at the bottom with quick-acting stainless steel clamps and shall have gaskets. There shall be no joints or fixing bolts on the top surface through which water could seep through. Bolted covers with gaskets for easy inspection and access to all insulators and bus bar joints.

14.3.9 Drain Plugs and Vents

The drain plugs shall be easily removable for cleaning purposes.

14.3.10 Gaskets

14.3.10.1 The gasket material and thickness shall be so selected as to satisfy the operating conditions imposed by temperature, weathering, durability, etc. Care shall be exercised to ensure that covers fit easily, that the required compression of the gaskets can be obtained without damage to the inspection covers by bolts and that covers do not bend after this compression has been applied. Over-compression of the gaskets shall be avoided.

14.3.10.2 The material of the gasket shall preferably be neoprene closed-cell sponge rubber or equivalent.

14.3.10.3 Flange gaskets shall be provided at the equipment terminal connections.




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14.3.11.4 Casketed (Neoprene) connections between adjacent sections of metallic enclosure.

14.3.11 Miscellaneous Hardware

The bus duct shall not have any through bolts. All nuts and bolts shall be mild steel hot dip galvanised. GS spring washers shall be provided for making satisfactory joints. Clamps splice plates etc. shall be provided wherever necessary.

14.3.12 Rain Hood

Whenever the outdoor portion of the bus duct is of flanged construction but of bolted type a rain hood made of non-magnetic material shall be provided over the flanges of the outdoor portion of the bus duct to prevent ingress of water particles due to heavy rain fall directly on bus duct enclosure. Arrangement to avoid ingress of water shall be provided by rain canopy.

14.4.0 Bus Conductor

14.4.1 Material

The material of the conductor shall be copper as specified in Technical Data Sheet. Material EC grade aluminium alloy equivalent to E91EWP conforming to IS: 5082 (1981). Final operating temperature of both bus bars and joints under continuous operation in enclosure limited to 85 deg. C. by thermometer method. While designing above, site condition and solar radiation shall be taken care. Bus bar surfaces to be tinned at joints and coated with oxide inhibiting grease prior to jointing for.

14.4.2 Rating

The temperature rise of conductor shall be as per IEC. Also the temperature of the bus shall not exceed 250C while carrying the specified short circuit current for one second when a fault occurs at the operating temperature. Bus bar arrangement as per IS: 5578 (1991).

14.4.3 Painting

The bus conductor shall be given a coat of matt black paint to facilitate heat dissipation. The bare conductor with above painting shall be designed to carry the normal rated current without exceeding temperature rise as specified.

14.4.4 Joints

Expansion joints on straight runs shall be provided at an interval of 6 metres with joints staggered in adjacent phases for non segregated busbars.

14.4.4.1Welded Expansion Joints

Flexible aluminium or copper connectors welded to the main bus bars shall be provided wherever deemed necessary. Busbar joints shall be of bolted type, cadmium plated with zinc




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bichromated high tensile steel bolts, nuts and spring washers. Bimetallic joints/ strips for jointing between dissimilar metals.

14.4.4.2Bolted Rigid Joints

The connectors shall be of the same material as the conductor and joints shall be silver-plated to ensure an efficient connection. The bolting schedule and contact pressure shall conform to accepted codes of practice.

14.4.4.3 Bolted Flexible Joints

Flexible braided copper connections shall be provided at the equipment terminal connections. Bimetallic connectors shall be provided between the bus bar and the copper flexible if the bus conductor is of aluminium alloy. The joints shall be capable of 25 mm settlement of the equipment mounting pads. The joints shall be suitably designed to take care of the vibration at the terminals as well as the expansion and contraction of the bus bars.

14.4.4.4 Bolted Expansion Joints

Expansion joints made of copper strips shall be provided to take care of expansion and contraction of the bus bars under normal operating conditions. All the above joints shall be tested for temperature rise to prove the adequacy of the design. The maximum temperature rise at the joints shall be less than the specified temperature rise for the busbars. In horizontal run of more than 10 mtr, 415 V busducts expansion joint with copper flexibles shall be provided at every 10 mtr interval.

14.4.5 Clamps and Hardware

14.4.5.1 The bus bar clamps at insulators shall be designed to withstand the forces due to momentary short circuit current. They shall permit free longitudinal movement of the bus bars during expansion and contraction. The material of the clamps shall be aluminium alloy. Suitable copper or aluminium spacers shall be provided wherever necessary.

14.4.5.2 All bolts, nuts and lock washers used in the bus assembly shall be of high tensile steel, plated for corrosion resistance.

14.4.5.3 Suitable splice plates and bimetallic connectors shall be provided wherever necessary.

14.4.6 Disconnecting Links

Disconnecting links with rating same as that of the main bus bars shall be provided in the run of the bus duct to facilitate disconnection of the bus bars during testing and maintenance. The separation of the bus bar sections with the bolted links removed shall be sufficient to withstand the rated voltage of the bus duct.

14.4.7 Shorting Links




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14.4.7.1 Shorting jumpers, for the purpose of drying out the equipment before commissioning or for carrying out short circuit test on the equipment, rated for the main bus current shall be supplied for shorting the bus duct at a location, adjacent to the disconnecting links.

14.4.7.2 The shorting links shall have drilling dimensions matching those of the main bus disconnecting links.

14.4.7.3 Bus ducts comprise of following sections to make the installation complete and to match with the terminal equipment:

Switchgear lead-in section with flexible hood and links.

Straight section in standard length.

Matching section (length as required).

Transformer lead-in section with flexible links.

Corner sections (horizontal and vertical).

Link Section

14.5 Bus Support Insulators

14.5.1 Within the bus duct the bus shall be mounted and supported on insulators. The insulators shall be mounted on resilient pads provided in the bus enclosure. Busbar support insulators of non-hygroscopic epoxy material having high impact and di-electric strength with an anti-tracking contour.

14.5.2 Material

14.5.2.1 The insulators shall be either porcelain or resin cast Fiber glass/FRP or equivalent types of non-hygroscope insulating supports are also acceptable.

14.6 Wall frame assembly and seal – off Bushings

14.6.1 Wall Frame Assembly

14.6.1.1 Wherever the bus duct passes through the plant building wall, from indoors to outdoors, a wall frame assembly with seal-off bushings shall be provided to prevent any leakage of rain water, infiltration of dust and air temperature variations from indoors to outdoors. The wall frame shall be fabricated out of aluminium angles and sheet and shall be suitable for grouting in the wall. It shall be provided with flanges on both sides to receive the bus duct flanges. A suitable size breather shall be provided for the two sections of the bus duct between the wall frame assemblies.

14.6.2 Seal-off Bushings




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14.6.2.1 The bus duct shall be equipped wherever necessary with seal-off bushings to prevent interchange of air at different temperatures. The seal-off bushings shall be flanged type.Two sets of seal off bushing shall be included for each busduct on wall crossing (one in existing building and one in new building)

14.6.3 Material

14.6.3.1 The insulator for wall frame assembly and seal-off bushings shall be of porcelain. Also the bushings shall be designed for thermal expansion/contraction due to temperature differential for outdoor/indoor use.

14.7 Bus Duct Supports

14.7.1 Material

The supporting structure shall be fabricated from standard steel sections and shall be hot dip galvanised after fabrication. The hot dip galvanising shall be in accordance with standards. Necessary supporting foundation including civil works to be provided.

14.7.2 Mechanical Strength

Calculations shall be furnished to substantiate the strength support structure to withstand the various static and dynamic loadings.

14.7.3 Accessories and Hardware

The supporting structures shall include supporting members, brackets, hangers, longitudinal beams, channels, nuts, bolts, washers and all other hardware which are necessary for the erection and support of the entire bus duct installation. All the accessories and hardware of ferrous material shall be hot dip galvanised.

14.7.4 Method of Support

14.7.4.1 Indoor portion of the bus duct may be supported from the floor or brackets from wall/column.

14.7.4.2 Outdoor portion of the bus duct shall be supported from ground below on suitable foundation in the ground.

14.7.4.3 The foundations and structures in outdoor area shall clear the transformers, transformer foundations, cable trenches.

14.7.5 Earthing

The earth bus shall run along the length of the bus duct on two sides and also each supporting structure shall be securely connected at two points to the PURCHASER’S station earthing bus. Earthing of enclosure to support structures shall be securely connected at two ends of bus duct. All necessary hardware, such as clamps, connectors, etc. required for this purpose shall be




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furnished by the VENDOR. Aluminium earth bus of size 50 x 10 mm running throughout the length of the busduct, positively connected to the body of the busduct. Provision at each end of busduct for terminating external earth conductor.

14.7.6 Markings

All components of the bus duct along with the supporting structure shall be distinctly marked for erection in accordance with the erection drawings to be prepared and furnished by the VENDOR. These marks shall be made in a manner as not to be obliterated and erased in transit or to damage the galvanising of the bus duct or the supporting structure.

14.8.0 Design Requirements of Busduct

14.8.1 The Bid shall contain design calculation in support of the bus duct design :

(a) Sizing of the bus bars vis-à-vis thermal capability to withstand rated continuous current and one second short time current.

(b) Spacing of the insulators vis-à-vis mechanical strength to withstand forces due to momentary short circuit current.

(c) Heat loss and temperature rise calculations for conductor and enclosure. All formulae and other information from which the heat losses have been derived shall be enlisted.

14.9.0 Space Heaters

The bus duct shall be provided with space heaters of adequate capacity to maintain the internal temperature above the dew point to prevent moisture condensation within the bus duct. The space heaters shall be rated for 230 V single phase, 50 Hz, AC supply. The space heater shall be automatically controlled by differential thermometers. An ammeter of suitable range may be provided in series with space heater circuit of bus duct to monitor proper functioning of space heaters.

14.10 Rubber Bellows

Rubber bellows at transformer end to take care of vibration.

14.11 Construction Details

Provision for draining moisture. Provision for mounting on brackets. Supply of GI supporting structures with necessary hardware. Supporting structures shall be fabricated from standard steel sections and shall be hot dipped galvanised after fabrication. Supporting structures shall cater for the various static-dynamic loading such as weight of the bus duct, short circuit forces, wind load and seismic forces, etc.

14.12 Test Equipment

Vendor shall ensure to use calibrated test equipment having valid calibration test certificates from standard laboratories traceable to National Standards.




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14.13 Spares

Whether included in the BIDDER’s recommendation or not, unit prices of the following items shall be quoted together with their suggested quantities and catalogue numbers:

i. Bus support insulatorsii. Flexible connectoriii. Isolating linkiv. Different type of gasketsv. Seal-off bushing

14.14 BUS DUCT TECHNICAL DATA SHEET

SL.NO DESCRIPTIONSPECIFICATIONRREQUIREMENTS

BIDDER'SPARTICULARS

1.0MANUFACTURER`s NAME AND TYPE, BIDDER TO FURNISH

2.0 RATED VOLTAGE/No. PHASE 433V/3-PH,4-WIRE SYSTEM

3.0 APLLICABLE STANDARD IS:8623

4.0 FREQUENCY 50Hz

5.0CONTINUOUS CURRENT RATING OF BUSBAR 4000A

6.0 SYSTEM NEUTRAL EARTHING SOLIDLY EARTHED

7.0 MAXIMUM SYSTEM VOLTAGE 660V

8.0 RATED VOLTAGE CLASS 1.1kV

9.0 BASIC IMPULSE LEVEL

9.11.2 x 50 MICRO SECOND WAVE- kV (Peak) 2kV

9.2ONE MINUTE POWER FREQUENCY WITHSTAND VOLTAGE -kV(PEAK) 2500V

10.0 SHORT TIME CURRENT RATING 50kA FOR ONE SECOND

10.1RATED PEAK WITHSTAND CURRENT Ka (PEAK) 105kA

11.00 CONSTRUCTION FEATURES

11.10 TYPENON-SAGRIGATED. TOTALLY ENCLOSED

11.20 MATERIAL COPPER

11.30 MATERIAL GRADE BIDDER TO FURNISH

11.40 LOCATION OUTDOOR/INDOOR




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11.50 SHEET STEEL THICKNESS 3.0mm

11.60 RAIN HOODNOT REQUIRED FOR IN DOOR PORTION

11.70 DEGREE OF PROTECTION IP-55 FOR OUTDOOR

11.80 PAINTING

11.8.1 EXTERIORLIGHT GREY SHADE 631 OF IS:5-1978

11.8.2 INTERIOR MATT BLACK

11.8.3 PAINT THICKNESS (MINIMUM)

11.9 SHAPE RECTANGULAR

11.10

MAX.TEMP.(HOT SPOT) OF ENCLOSURE AT RATED CURRENT OVER AMBIENT 50- °C 20°C

12.0 BUS BARS

12.1 MATERIALCOPPER-E91EWP-IS:5082(1981)

12.2 BUS BAR SECTION FLATS/CHANNEL

12.3 PHASE TO PHASE CLEARANCE 25.4mm

12.4 PHASE TO EARTH 25.4mm

12.5

TYPE OF JOINTS BETWEEN ADJACENT SECTIONS OF BUS CONDUCTORS. BOLTED

12.6

MAX.TEMP.(HOT SPOT) OF BUSBAR AT RATED CURRENT OVER AN AMBIENT 50 °C 35°C

12.7 PAINTING OF BUSBARS REQUIRED

13.0 INSULATORS PORCELINE/CAST RESIN

14.0WALL FRAME ASSEMBLY WITH SEAL OFF BUSHING REQUIRED

15.0 PHASE CROSS OVER NOT REQUIRED

16.0 FLRXIBLE CONNECTOR (COPPER) TWO SETS

17.0 RUBBER BELLOW TWO SETS

18.0 EXPANSION JOINT ONE SET

19.0 SPACE HEATER AS REQUIRED. 230V AC

20.0 INSPECTION COVER REQUIRED AT BOTTOM

21.0 SILICA GEL BREATHER AS REQUIRED

22.0 SUPPORT INSULATORS




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22.1 TYPENON -HYGROSCOPIC EPOXY SMC MOULDED

22.2MAX. DISTANCE BETWEEN SUPPORTS

TO BE WORKED OUT BASED ON SHORT CIRCUIT CALCULATION

23.0 EARTH BUS

23.1 MATERIAL COPPER

23.2 SIZE 50 MM X 10MM

24.0 SPARES AS MENTIONED IN SPECS

14.15 BILL OF MATERIAL

Sl. No

Item Description Qty./Bus duct

Total Qty.

Unit Price

Total Price

Remarks

1 Straight run 3 phase, 4000A. (Outdoor type)

-- 30.0 Mtrs.

2 L bends --- 7 No To be as per Layout3 Adapter box at each Transformer 1 No. 2 No.4 Adapter box at PCC 1 No. 2 No.5 Expansion Joints (Copper) 2 No. 4 No. In the run of

Busduct.6 Rubber bellows 2 No. 4 No. Only Neoprene

Rubber Manufacturer Test certificate for the Material to be furnished.

7 Shorting cum Disconnecting link

1 No. 2 No.

8 Supporting structure 1 Lot 2 Lot9 Silica gel Breather &

Drain cock assy.4 Set 8 Set Vendor to decide

10 Wall frame assembly with seal off Bushing 4000A

1No. 2 No.

11 4000A TP Cu. Flexible at Transformer and switchgear end.

2 Set. 4 Set.

12 Space heaters with thermostatand 1 No. 2P MCB (3nos.Sp.Htr.with one thermostat and MCB is called one set)

1 Set 2 Set

13 Marshalling box for spaceheater

1 No. 2 No.

14 Set of maintenance tools and tackle as required

15 Necessary support structures




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& erection hardware.

Any other items not mentioned here but required to make the system complete shall be included in the scope of supply.Spares shall be quoted in the above BOM as listed in the specification.The quantity indicated above are tentative the vendor has to necessarily quote for the unit quantity. The price quoted by the vendor shall be valid for any quantity, which shall be decided during detailed engineering. The Inspection Cover to be at the Bottom of the Bus duct enclosure.

14.16 MAKE OF COMPONENTS

Terminal block: ELMEX / CONNECTWELL Control cable: CCI / PRG / POLYCAB / FINECORE / UNIVERSAL MCB: SIEMENS / L & T Insulator: MASTCAST / BARODA/ IEC/ JAYASHREE




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ANNEXURE-3

15.0 SPECIFICATIONS FOR 11KV SWITCHBOARD

15.1 GENERAL CONDITION

15.1.1 This section covers the design, engineering, manufacturing, inspection, and delivery at site, erection, testing, commissioning and handing over of the HT switchgear .

15.1.2 The scope of work and services shall include all necessary work and supply of equipment and material whether mentioned in these specifications or not, but are necessary for the satisfactory, safe operation and maintenance of the system, capable of continuous, efficient, and reliable operation with minimum maintenance under the environmental and operating conditions applicable to this power plant site.

15.1.3 The work shall be carried out as per the latest Indian Standards or recognized international standards. The entire electrical system shall comply with currently applicable statutes, regulation and safety codes related to design, construction and operation of the electrical items mentioned in this specification.

15.2 SCOPE OF WORK

15.2.1 11kV Switchboard.15.2.2 HT/LT/Power & Control Cable

HT Cu XLPE armoured cable UE 3C, 1R, 185 Sq.mm from 11kV switchboard to Station Auxiliary Transformer-1 (Length as per the plot plan).

HT Cu XLPE armoured cable UE 3C, 1R, 185 Sq.mm from Station Auxiliary Transformer to Switchyard at power house (Length as per the plot plan ).

15.2.3 Cable supporting structures, GI cable tray (Ladder type & perforated type), cable racks, inserts and other associated accessories and fore sealing materials for laying. Termination and sealing of cables are as under vendors scope.

15.2.4 HT and LT power & control cables including their termination and jointing materials. All the cables shall be of copper material only.

15.2.5 51N, 64 relays (for SAT 1&2 neutral) as per attached drawing 1-3626-400-002 (Rev 08).15.2.6 Complete structures as required for all panels and other equipment covered under this scope.

15.3 11kV SWITCHBOARD




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15.3.1 Scope

The scope of works consist of design, engineering, manufacture/procurement, testing, supply, erection, and commissioning of the following HT switch gear:

i) 11kV, 1250A, Generator Circuit Breaker-1 no.

ii) 11kV, 630A, Grid Circuit Breaker-1 no.

iii) 11kV, 1250A, SOP Substation Circuit Breakers-2 no.

iv) 11kV, 630A, Station auxiliary transformer 1&2 Circuit Breakers-2 no.

v) 11kV, 630A, HT Switchyard Pumphouse Circuit Breaker-1 no.

vi) 11kV, 1250A, Spare Circuit Breaker-1 no.

vii) Bus PT - 1no

15.3.2 Design criteria

15.3.3.1 The switchgears shall be indoor, metal clad, draw out type. The feeders shall be provided with Vacuum/SF6 circuit breakers. The operating mechanism of the circuit breakers shall be of the stored energy type. The trip coils are rated for 110V DC terminals.

15.3.3.2The Generator Circuit Breaker and Grid breaker shall be connected to the Alternator and Grid respectively. The SAT Circuit Breakers shall be connected to the station auxiliary transformers-1&2 for plant auxiliary loads & two breakers for catering the Plant load.

15.3.3.3For continuous operation at specified ratings, temperature rise of the various switchgear components shall be limited to the permissible values stipulated in the relevant standards and/or this specification.

15.3.3.4The Switchgear and components there of shall be capable of withstanding the mechanical forces and thermal stresses of the system short circuit current without any damage or deterioration of material.

15.3.3.5Switching over voltage for breakers shall be limited to 2.5 pu at breaker

15.3.3.6The main buses and connections shall be of high conductivity Copper conductor, sized for specified current ratings with maximum temperature limited to 85 Degree C (i.e. 35 Degree C rise over 50 Degree C ambient) with heat shrinkable sleeves.

15.3.3.7All bus connections shall be silver plated. Adequate contact pressure shall be ensured by means of two bolts connection with plain and spring washers and lock nuts.




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15.3.3.8 The CT and PT’s required suitable for the operation of the breakers shall be provided as per SLD 1-3626-400-002(rev 08).

15.3.3.9 The relays shall be of Numerical type, latest version and be of reputed proven make and design. Relays shall be of draw out design with built-in testing facilities. Small auxiliary relays may be in non-draw out execution and mounted within the cubicle.

15.3.3.10 In case non-availability of particular relay, Static relay may be used.

15.3.3.11 Relays shall be rated for operation on 230V AC secondary voltage and 1 A secondary current as per SLD 1-3626-400-002(REV 08).

15.3.3.12 The Tenderer shall furnish the setting of relays in coordination to other protection also give calculation in support.

15.3.3.13 The meters type and Accuracy class shall be provided as per SLD 1-3626-400-002(rev 08).

15.3.3.14 The switchgear shall be fully wired at the factory to ensure proper functioning of control, protection, and interlocking schemes. The wiring, terminal block arrangement shall be in conformity with the General Technical Conditions.

S.No. Technical Particulars System Parametersa) System Parameter1.0 Nominal System voltage 11 kV2.0 Highest System voltage 12 kV3.0 Rated Frequency 50 Hz4.0 Number of phases Three5.0 System neutral earthing Solidly earthed6.0 One minute power frequency

Withstand voltage for Type tests 28for Routine tests 28

7.0 1.2/50 microsecond Impulse withstand voltage

75 kV (peak)

8.0 Max. system fault level 25 kA for 1 second9.0 Dynamic withstand rating 62.5 kA (peak) 10.0 Control supply voltage -

Trip and closing coils 110V DCSpring charging motor 230V ACSpace heaters 230V AC

11.0 Ambient temperature 50°Cb) Busbars1.0 Continuous current rating at 50°C

ambientas per system requirements

2.0 Temperature rise 40°C for plain joints




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55°C for silver plated joints c) Constructional requirements 1.0 Cable entry

Power cables BottomControl cables Bottom

2.0 Earthing conductor Galvanised steel stripd) Circuit breakers1.0 Short circuit breaking current

AC component 25 kADC component As per IS 13118 or IEC 62271

2.0 Short circuit making current 62.5 kA (peak)3.0 Operating Duty B - 3min - MB - 3min - MB4.0 Total break time Not more than 4 cycles5.0 Total make time Not more than 5 cycles6.0 Operating Mechanism Motor wound spring charged stored energy type

as per IEC 62271e) Relays1.0 One minute power frequency 2.0 kV (rms)f) Meters1.0 Accuracy class for meters Not inferior to 0.52.0 One minute power frequency 2.0kV(rms)g) Current Transformer1.0 Class of Insulation Class E or better2.0 Rated output of each Adequate for the relays and devices connected,

but not less than ten (10) VA.3.0 Accuracy class for Measurement Not inferior to 0.5

Protection core differential CTs PS other protection CTs As per SLD

h) Voltage TransformersRated voltage factor 1.2 continuous for all VTs, and 1.9 for 30 sec.

for star connected VTs Measurement Not inferior to 0.5 Protection As per SLD

15.4 H.T, LT POWER AND CONTROL CABLE

15.4.1 Scope

15.4.1.1This specification covers the design, procurement, shop testing, inspection, packing, delivery and installation at Project Site of HT, LT Power and Control cables required as mentioned in the electrical scope of work.

15.4.2 Design Criteria




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15.4.2.1The High voltage, XLPE insulated power cables will be mostly installed in ventilated cable trays provided inside ducts/tunnels, with some cables installed underground.

15.4.2.2 Maximum temperature of conductor for continuous operation of cables shall not be more than 90C for cross linked polyethylene insulated cables. Temperature rise and withstand capacity for short circuit conditions should be 250 C.

15.4.2.3The cable shall be able to carry the full load current of the circuit continuously under the specified ambient temperature and other conditions of installation. For this purpose, suitable derating factors shall be considered due to:

15.4.2.4 Thermal resistivity of soil15.4.2.5 Ambient ground / air temperature15.4.2.6 Derating factor for grouping of cables over the current ratings at normal conditions given in

standards.15.4.2.7The cables for circuit breaker controlled circuits shall withstand the fault currents for the

following fault clearing times.15.4.2.8 The cables grades shall be as per the following: 15.4.2.9 HV voltage (Line to earth voltage / Line to line voltage ) : 11kV/11 KV15.4.2.10 The minimum short circuit withstand capacity of 11 KV cables shall be 25 kA.15.4.2.11 All HT cables shall be with Copper conductor XLPE insulated, screened, sheathed, armoured

and over all extruded FRLS, PVC sheathed. 15.4.2.12 The outer sheath of the cable shall be supplied by extrusion over the armouring and shall be

of fire retardant low smoke(FRLS) type PVC compound confirming to the requirements of type ST2 compound of IS: 5831. To protect the cable against rodent and termite attack, suitable chemicals shall be added into the PVC compound of the outer sheath.

15.4.2.13 The cable shall be supplied in standard drum lengths. 15.4.2.14 The LT cable shall be of 1100 volt grade, single or multi core, stranded copper conductor,

extruded HR Type C PVC armoured with galvanized steel wire or strip for multi core cables and aluminium wire or strip armoured for single core cables, outer sheathed with extruded HR Type C PVC type complying with IS:1554 Part I &II

15.4.2.15 The scope shall also include cable tray / tracks, cable termination kits, cable lugs, armour clamps, cable glands, identification tags, insulating tapes and compounds, sleeves, supporting structure, bolts, nuts washers and all other installation materials. Cable trays shall be of galvanized ladder / perforated type.
