BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

c. Ratio and HV magnetizating current tests.d. Vector group cheek.e. Motors overload protection tests.f. Buchholz device tests.g. Temperature instrument calibration and tests.h. Operational tests on tap change equipment.i. Dielectric strength tests of insulation oil.The above tests shall be recorded on approved test sheets, two signed copies ofwhich shall be forwarded to the Board immediately after a test or series of testshas been completed.The Board & Engineer shall countersign the test sheets if found to be satisfactoryand retain one copy. The Contractor shall provide to the Board six bound copiesof all site test sheet as final records.(6) 230 kV Switchgeara. General CheekA general check of all the main switchgear and ancillary equipment shall be madeand shall include a check of the completeness, correctness and condition of earthconnections, arcing ring and horn gaps, painted surfaces, cables, wiring,pipework, valves, blanking plates and all other auxiliary and ancillary items.Checks shall be made for oil and gas leaks and that insulators are clean and freefrom external damage. A check shall be made that loose items which are to behanded over the BOARD, e.g. blanking plates 3 tools, spares, are in order and arecorrectly stored or handed over.b. Circuit BreakersFollowing completion of erection of circuit breakers and all high voltage circuits,power frequency withstand voltage test at a level to be agreed shall be applied.Local air components associated with pneumatic operation, including aircompressors, shall be tested and air loss measurements and pressure and alarmsettings checked. Tests shall be made also on mechanical and hydraulic operatingsystems.Contact resistance tests shall be carried out with not less than 15 amperespassing through the contacts. In the case of multi-interrupter circuit-breakers,resistance tests will be required at each interrupter or pair of interrupters as wellas through the series of interrupters on each pole.Operational tests will include local and remote trip/close. SF6 gas type circuitbreakerstesting shall be required on the gas system to prove the gas quantity, itsdryness and its dielectric strength. The gas leakage shall also be measured.c. Isolators and Earthing SwitchesManually operated equipment shall be subject to operational tests to confirmcontact pressures, contact resistance, synchronism of operation of all phases andthe ease of operation.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)151