66kV GIS S/Stn. Dharuhera.

The 72.5kV SF6 Gas Insulated Switchgear (along with AHU with room) for three phase system shall have double bus bar arrangement with 8 bays (3 No. 25/31.5MVA Transformer, 1 No. bus-coupler and 4 nos. feeder bays. Space for future bays shall be kept in GIS hall for adding future bays and jointing plugs required for connecting GIS of different makes. The SF6 Gas Insulated Switchgear rated for 66kV, 3-phase, 50Hz, 31.5kA fault level shall be of the indoor metalenclosed type, comprising of following items. 72.5kV, 1250A, single 3 – f or three 1 –f, SF6 gas insulated, metal enclosed bus bars arrangement, consisting of 1250A single 3 – f or three 1 –f SF6 gas insulated switchgears, each Bus Bar comprising of :- i. Bus bar enclosures running through the length of the switchgear to interconnect each of the circuit breaker bay modules in double main bus system. ii. Three, 2-core, single phase or single 3 – f voltage transformers/ PTs. iii. 1250A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector and one, 3 – f or three 1 – f, single pole, group operated earthing switch with manual and motor driven operating mechanisms. iv. 1250A, One high speed fault make 3 – f or three 1 – f, single pole, group operated earthing switches, complete with manual and motor driven operating mechanisms. v. Each GIS compartment with gas monitoring device, pressure switch etc. as required. vi. Terminal boxes/ Local Control Cubicle. vii. Interconnecting wiring/ piping. viii. Grounding, support structures and platforms.

72.5kV, 800A, single 3 – f or three 1 –f, Bus coupler bay module, consisting of 800A single 3 – f or three 1 –f SF6 gas insulated switchgears, comprising of: i. 800A, One 3 – f or three 1 –f, SF6 gas insulated circuit breaker, complete with operating mechanism. ii. Three,3-core,single phase current transformers(600-300-150/1-1-1A) iii. Two sets of isolator/disconnector switches each of 800A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector switches each with 3 – f or three 1 – f, single pole, group operated earthing switch and complete with manual and motor driven operating mechanisms. iv. Each GIS compartment with gas monitoring device, pressure switch etc. as required. v. Terminal boxes/ Local Control Cubicle. vi. Interconnecting wiring/ piping. vii. Grounding, support structures and platforms.

72.5kV, 800A, single 3 – f or three 1 –f, Transmission line feeder circuit breaker bay modules, consisting of 800A single 3 – f or three 1 –f SF6 gas insulated switchgears, each comprising of:- i. 800A, One 3 – f or three 1 –f, SF6 gas insulated circuit breaker, complete with operating mechanism for outgoing feeder. ii. Three, 66kV LAs (LAs should not be provided in GIS) and Voltage detectors /sensors (Output shall be taken to LCC) iii. Three, 3-core, single phase current transformers (600-300-150/1-1-1A) iv. 800A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector without earthing switch, complete with manual and motor driven operating mechanisms. v. 800A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector with one, 3 – f or three 1 – f, single pole, group operated earthing switch, complete with manual and motor driven operating mechanisms. vi. 800A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector with one normal and one high speed fault make 3 – f or three 1 – f, single pole, group operated earthing switches, complete with manual and motor driven operating mechanisms. vii. Each GIS compartment with gas monitoring device, pressure switch etc. as required. viii. Terminal boxes/ Local Control Cubicle. ix. Interconnecting wiring/ piping. x. Grounding, support structures and platforms.

72.5kV, 400A, single 3 – f or three 1 –f, Transformer feeder circuit breaker bay modules, consisting of 400A single 3 – f or three 1 –f SF6 gas insulated switchgears, for 66/11kV transformer, each comprising of: - i. One 3 – f or three 1 – f, SF6 gas insulated circuit breaker, complete with operating mechanism for incomer bay from 66/11kV transformer. ii. Three, 3-core, single phase current transformers (300-200-150/0.577-1-1A). iii. 400A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector without earthing switch, complete with manual and motor driven operating mechanisms. iv. 400A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector with one, 3 – f or three 1 – f, single pole, group operated earthing switch, complete with manual and motor driven operating mechanisms. v. 400A, One 3 – f or three 1 – f, single pole, group operated isolator/disconnector with two earthing switches each comprising of one 3 – f or three 1 – f, single pole, group operated earthing switches complete with manual and motor driven operating mechanisms. vi. Each GIS compartment with gas monitoring device, pressure switch etc. as required. vii. Local Control Cubicle. viii. Interconnecting wiring/piping. ix. Grounding, support structures and platforms.

66kV XLPE copper Cable 4X1Cx400mm2 (including one no. spare cable per bay) coated with fire retardant Paint for connecting 66kV side of 66/11kV transformer with GIS.

Termination kit at both ends for 66kV XLPE copper Cable (1 x 400mm2) Termination Kits for (AIS/GIS) both ends along with accessories constitute a set for each cable (3 x 4 = 12 Sets)

66kV XLPE Copper Cable 4x1Cx800mm2 (including one no. spare cable per bay) coated with fire retardant Paint for connecting 66kV line with GIS.

Termination kit at both ends for 66kV XLPE copper Cable (1 x 800mm2) Termination Kits for (AIS/GIS) both ends along with accessories constitute a set for each cable (4 x 4 = 16 Sets.)

Ventilation System (AHU) to accommodate in designated room in GIS Hall as per Annexure-V as it is already an integral part of the ventilation system.

25/31.5MVA, 66/11 kV Power T/F alongwith 10% extra oil