BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

g. Integrating time register for hydraulic pump shall be driven by a selfstarting synchronous motor through mechanical gears to record operatinghours of hydraulic pump and shall be able to perform four operationswithout AC power.h. Gas circuit breaker shall be provided with gas density detector respondingto gas density and pressure. This gas density detector shall have two (2)different functions according to the gas condition: The first step givesalarm and the second step locks the operating mechanism. Operatingmechanism which employs compressed air or hydraulic for driving thecircuit breaker shall be provided with pressure detector which have two (2)different functions according to compressed air or hydraulic condition :The first step gives alarm and the 2nd step locks the operatingmechanism.i. The weather and dust proof type control box shall be furnished with thecircuit breakers. The control box shall be equipped with all necessary partsto operate the circuit breaker, such as control solenoids, operating switchof remote and local control, auxiliary switch, terminal blocks, protectivedevices, indicating lamp sockets, and other accessories. An anticondensation electric heater with thermostatic switch shall be providedinside the control box.j. The circuit breakers shall be provided with an emergency push buttonswitch with cover to prevent inadvertent switching.k. The circuit breakers shall be provided with an electrical anti pumpingrelay.l. The supporting structure shall be free from mechanical vibration andloosening under long term use.m. The circuit breakers shall be designed to facilitate inspection,especially for those parts which need inspection frequently.n. The circuit breakers shall be filled with sufficient SF 6 gas.o. SF 6 gas leak detector shall be furnished.p. The circuit breakers shall be driven by hydraulic and spring latch. Hydraulicsupplying system shall be furnished with the circuit breakers, and shall beinstalled in weather dust proof type housing. The operating mechanismshall be designed to meet the requirements of IEC 56q. Temperature limitation shall be in accordance with IEC 56.r. The Contractor shall furnish all control cables, pipes or ducts andfittings between each phase and control box.s. The indicating lamp signals which display " on (red) “ and " off green)" ofthe main contacts shall be furnished on the each control box of circuitGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)59