NIT NO. 19 (2025-26)/WW-III

Disconnecting of HT supply from main HT panel after proper switching off 11 KV OCB discharging the supply. Complete drain out of transformer oil from transformer to empty oil drum by oil machine, dismantling of conservator tank all protection relays cable end boxes vent pipes and other items as required. (S.O.R.2023 item code 6.1.1)

Cleaning of transformer oil tank and removing of sludge settled in the bottom with the help of vacuum pressure cleaning machine thoroughly, cleaning of core and winding of transformer with hot oil and proper safety precaution to prevent the winding damage as required, cutting of old overheated insulation of winding and re-insulation of weak point with the help of HT insulation material and proper taping etc. (S.O.R.2023 item code 6.1.2)

Replacement of top cover gasket vertical vent gasket & missing hardware to stop the oil leakage. (S.O.R.2023 item code 6.1.3)

Replacement of salica gel. (S.O.R.2023 item code 6.1.4)

Repairing of tape changer.

Checking & matching of control wiring of all protection relays and calibration of bucchlaz relay and protection relays testing the same.

Complete assembling of transformer cleaning of complete transformer tightening of all connection of incoming and outgoing side and testing & checking of IR test with megger of winding & cable of both sides with HI pot machine (S.O.R.2023 item code 6.1.6)

Filling of T/oil to up to top up level as required to make power (S.O.R.2023 item code 6.1.7)

P/Fixing of winding protection pad. (S.O.R.2023 item code 6.1.8)

Servicing of transformer including tightening of terminals, inspection of bushings, gasket checking and minor rectification

Dehydration & filtration of transformer oil using vacuum dehydration plant including heating, moisture removal and filtration (400 KVA Transformer). (S.O.R.2023 item code 6.1.10)

Testing of transformer oil – BDV, moisture content & acidity before and after dehydration

Providing complete shutdown, isolation, supervision, commissioning and documentation of 400 KVA power transformers, including: Planning and execution of safe shutdown of transformer and associated HT/LT panels.Electrical isolation from incoming and outgoing feeders, ensuring proper lock-out and tag-out (LOTO) procedures. Deployment of skilled technical personnel for continuous supervision during oil dehydration, filtration and servicing operations.Coordination with operating staff to ensure minimum downtime of pumping operations.Re-energisation and commissioning of transformer after completion of servicing, including gradual load application.Recording and verification of pre- and post-servicing electrical parameters.Preparation and submission of complete documentation, including oil test reports, commissioning checklist, safety compliance records and service completion certificate. including All labour, tools & tackles, safety gear, consumables and incidental charges required to complete the work in all respects.

Complete cleaning and chemically washing of oily and muddy transformer body and painting of transformer with enamel paint. (S.O.R.2023 item code 6.1.11)

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