BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

subjected to the following tests by the Contractor, in accordance with the latestrevisions of IEC 76 "Power transformers" and 551 "Measurement of transformerand reactor sound levels".a. General inspectionb. Measurements of Winding resistancec. Voltage ratio measurement and check of polarityd. Measurement of impedance voltagesC. Measurement of load lossf. Measurement of no-load loss and currentg. Test of temperature riseh. Induced over-voltage withstand testi. Separate-source voltage-withstand testJ. Insulation resistance measurement (megger)k. Results of shop tests to be submitted.- Results of type tests of lightning impulse-voltage withstand test- Test of protective relays- Characteristic test of bushing type current transformers16.2.5 230 KV SWITCHGEAR EQUIPMENT(1) Circuit BreakersThe tests shall be performed in accordance with the latest revisions of IEC 56-4'High-voltage alternating-current circuit breakers, Part 4: Type tests and routinetests'.- General inspection- Insulation resistance measurement- Dielectric withstand voltage test- Operation testIn accordance with the requirements of IEC 56, details of the transient recoveryvoltage to which the circuit breaker will be subjected during short circuit testingshall be submitted to the Board for approval.The Board may require in addition any of the following tests to be carried out, thedetails of which will be agreed between the Board and the Contractor:-- Earth fault interruption tests- Out of phase switching tests according to IEC 267- Capacitance switching tests- Small inductive breaking current switching tests- Tests under environmental conditions- Voltage withstand test after breaking capacity tests(2) Isolators and Earthing SwitchThe tests shall be performed in accordance with the latest revisions of IEC 129"Alternating current disconnectors (isolators) and earthing switches".- General inspection- Insulation resistance measurement- Dielectric withstand voltage test- Operation testGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)142