BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

f. Sample test reports or data sheets and all specific result sheet forms thatwill be used for the test.g. Written procedure and description of conducting the test.h. All test data to be recorded by the Contractor and the Board & Engineer.Necessary tests shall also be performed for GBC & EDG as per relevant standard.16.3.3 FIELD INSPECTIONS AND TESTS ON SWITCHGEAR, EQUIPMENTThe following site tests shall be performed by the Contractor.(1) Protection, Control, Alarm, Measurement and Indication Equipmenta. WiringInsulation resistance test using 500 V Megger shall be carried out on all AC andDC protection, control, and alarm and indication circuit.The insulation of all circuits shall be checked before proceeding with other testsand it is also essential that all AC wiring is correctly connected relay contacts,auxiliary contacts, etc., being closed, as necessary, to verify this. Checks shall bemade on cable glands, cable jointing, fuse or circuit breaker and small panelitems, such as indicating lamps. Static equipment which may be damaged by theapplication of test voltage shall have the appropriate terminals short circuited.Inter relay, inter unit and cubicle wiring carried out at the Site shall be checked tothe appropriate circuit and/or wiring diagram.Where, it is found necessary during pre commissioning work to effect sitemodifications to the secondary wiring, site copies of the appropriate schematicand wiring diagrams shall be suitably marked as agreed with the Board before thecircuit is commissioned.Loop resistance measurements shall be made on all current transformer circuits.Separate values are required for current transformer circuits.b. Mechanical CheckAll relays shall be examined to ensure that they are in proper working conditionand correctly adjusted, correctly labelled, and the relay case, cover, glass andgaskets are in good order and properly fitting.c. Secondary InjectionSecondary injection shall be carried out on all AC instruments and relays, usingvoltage and current of sinusoidal waveform and rated power frequency.(2) Current Transformer Magnetising TestsThe magnetisation characteristic of all current transformers shall be checked atthe minimum of two points to identify the current transformers with reference tothe manufacturer's estimated design curve, and to determine the suitability of thecurrent transformer for its intended duty. It may be noted that it is not normallynecessary to check the characteristic up to the knee-point for this purpose.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)149