BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

7. 6.6 kV SWITCHGEAR AND LOW TENSION SWITCHGEARAs shown in the Auxiliary One Line Diagram, the auxiliary Power system shallconsist of the following equipment, but not be limited to:- 6.6 kV Switchgear- 415 V Switchgear and Motor Control Centres7.1 6.6 kV SWITCHGEAR7.1.1 CONSTRUCTIONType and Rating- TypeIndoor, steel sheet formed cubicle, single bus draw-out type- RatingRated voltage: 6.6 kV- Rated insulation levelLighting impulse withstand voltage : 60 KVPower frequency withstand voltage : 22 KV(1 min)- Rated frequency :50Hz- Rated normal currentIncoming and bus tie circuitFeeder circuitRated short circuit currentRated short circuit making currentNumber of circuit: 600 A: 600 A: 40 kA (rms.): 100 kA (peak): Determined by the Contractor buttwo (2) Spare feeders shall beincluded.(2) Draw-out SystemCircuit breakers shall be drawn out horizontally by hand, and primary and controlcircuits shall be disconnected from the buses automatically.(3) CompartmentCircuit breaker chamber and bus chamber shall be isolated by groundedsteel plates, and bus conductors shall be installed.(4) Front DoorEach compartment shall have hinged door mounted with instruments switches,indicating lamps and test terminals.(5) Rear PanelEach compartment shall have removable covers.(6) Leading of CableGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)72