BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

Control cables shall be led from terminal blocks through front bottom offront bottom of cubicle.(7) Bus bar3-phase, 3-wire system. Copper bar, totally insulated. Buses shall besuitable for capacity continuous duty.a. Main bus, more than 1000Ab. Branch bus, more than 600 A(8) Control Power Bus2-wires DC 250 volt insulated wire.Branched circuit shall consist of two circuits of closing and tripping for everycircuit breaker.(9) Neutral Grounding ResistorLow tension winding of the station transformer shall be grounded throughneutral grounding resistor which is accommodate in the compartment of 6.6 kVswitchgear. The current rating shall be suitable for a single phase to earth fault on6.6 kV circuit for 30 seconds and a maximum neutral current shall not beexceeded 10 A.7.2 415 V SWITCHGEAR AND MOTOR CONTROL CENTRESAs shown in the Auxiliary One Line Diagram, 415 V switchgears and motor controlcentres shall be supplied to control all electric motor driven auxiliaries and supplypower to the other electric load of the generating plant. If control centres ordistribution panels not described in this Specification be needed, they shall besupplied with each facility.The switchgears and motor control centres are classified into the following:- One (1) sets of 415 V common switchgear- Three (3) sets of 415 V unit switchgears- Four (4) sets of 415 V motor control Centres7.2.1 SWITCHGEAR (POWER CENTER)(a)Type and Rating- TypeIndoor, steel sheet formed cubicle, single bus draw out type.- RatingRated voltage:415 VRated frequency:50 HzRated normal currentIncoming and bus tie circuit:2,500 AFeeder circuit:600 ARated short circuit current:40 KA(rms)Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)73