Winding correction, Leak arresting and Oil testing of transformers in Phase-2 plants of FACT-CD, Ambalamedu.

Winding correction, Leak arresting and Oil testing of transformers in Phase-2 plants of FACT-CD, Ambalamedu.

Testing of 2 MVA, 11KV/ 415V Transformer in Barge substation. The scope of work includes disconnection of HT/LT cables/ bus duct/ earth cables/control cables of transformer if necessary; conducting Voltage ratio test, Insulation resistance test, Winding resistance test, Magnetic balance test and submitting the reports.

Winding correction of 2 MVA, 11KV/ 415V Transformer in Barge substation. The contractor will be instructed to do this work only if it is required after analyzing the test reports submitted by the contractor as per Sl.No.1. The scope of work includes disconnection of HT/LT cables/ bus duct/ earth cables/control cables of transformer if necessary; draining of oil to suitable oil levels, dismantling oil conservator, Buchholz relay and auxiliary pipe lines, opening top cover, inspection and cleaning of off-load tap changer, disconnecting tap changer mechanism if required, inspecting winding tapings, correcting the winding tapings if required, checking tightness of all tap connections, verifying inductance and resistance of tap windings at each tap position, conducting transformer ratio test, re-fixing the dismantled parts after the work, replacement of gaskets of HT/ LT bushings, top cover, leaky drain plugs, inspection covers, terminal box covers, tap changer, neutral bushes, oil valves flanges etc. with new ones; checking the tightness of all connections; refilling of oil via circulation after vacuum filtration to improve BDV as required; inspection of any oil leak after the work and rectifying if so and charging of the transformer, confirming the transformer ratio by applying rated voltage on primary at each tap positions. Transformer oil required for topping-up the oil level shall be supplied by FACT at free of cost. Gaskets of suitable thickness and size required for executing the work shall be supplied by the contractor. If the voltage variation is not because of the issues with the tap-changer, the probable cause of voltage variation and action to rectify the issue shall be submitted as a report. All necessary tools and equipments like oil filter, vacuum pump, oil storage drum etc. required for the work shall be brought by contractor. Approximate oil quantity : 2200 Litre

Leak arresting of 2/1.5 MVA, 11KV/ 415V Transformers in phase-2 plants. The scope of work includes disconnection of HT/LT cable/ bus duct of transformer if necessary; draining of oil to suitable oil levels, opening inspection covers, opening top covers, replacement of gaskets of HT and LT bushings, top cover, drain plugs, inspection covers, terminal box covers, tap changer, neutral bushes, conservator lines, buchholze relays, connection to cooling fins, oil valves flanges etc. with new ones; checking the tightness of all connections; refixing the dismantled parts; refilling of oil via circulation after vacuum filtration to improve BDV as required; inspection of any oil leak after the work and rectifying if so and charging of the transformer. Transformer oil required for topping up the oil level shall be supplied by FACT at free of cost. Gaskets of suitable thickness and size required for executing the work shall be supplied by the contractor. All necessary tools and equipments like oil filter, vacuum pump, oil storage drum etc. required for the work shall be brought by contractor.

Testing of Insulating oil- samples of power transformers as per IS 1866-2000 and its latest amendments 1. Interfacial Tension, 2. Specific Resistance, 3. Tangent delta, 4. Water Content, 5. Neutralization Value (Total acidity), 6. Break Down Voltage, 7. Flash Point, 8. Sediments and sludge. The scope include taking oil samples from Transformers at site, analyzing the oil at vendor's lab, submission of test results with complete recommendations for reconditioning /replacement of oil etc.

Testing of insulating oil samples of power transformers for the detection of incipient faults by conducting Dissolved Gas Analysis (DGA) . The sampling, testing and analysis shall be as per IS 9434:2019. The scope include taking oil samples from Transformers at site, analyzing the oi1 at vendor's lab, submission of the test results with complete recommendations regarding quality of insulating materials, winding damages, internal faults etc.

Furan Analysis. The scope of work includes conducting Furan test of insulating oil of transformers up to 7 MVA. The sampling, testing and analysis shall be as per IS 15668:2006. The contractor shall make all arrangements of collecting the transformer oil from site, transportation to laboratory, conducting furan test, identifying furanic compounds in the oil using high-performance liquid chromatography, submitting test reports with complete recommendations regarding quality of insulating materials, insulation damages etc. Calibration certificates of equipments used shall be submitted.

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