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  Periodical Overhaul

Points to be attended during Periodical Overhaul

After than the lifting out the core and placing it upon a trestle, the interior of the tank should be carefully cleaned of all accumulated muck, sludge, and dirt. Be careful to clean up the drain plug, and wash the interior of the tank also the cooling tubes, 1st along with old oil and once again with new oil. If there are any cracked or badly welded joints they may be attended to. Carefully clean all the gasket surfaces and maintain new gaskets ready. Test acidity of oil, if excessive than replaces it by fresh oil. Sludge to be separated from the core and coil assembly. The sludge has to be scraped off with fibre or wooden strips. Oil ventilation ducts should be specifically cleared. Through applying a jet of oil under pressure the coil assembly's interior parts could be flushed and all traces of sludge eliminated.

Wedges that are generally given to hold the coil assembly in position should be driven in to take up any slackness. Large transformers are frequently equipped along with adjustable screws bearing on clamping rings located on the outer side of the end coils that is why any slackness because of shrinking of coils could be taken up. These screws should be tightened up. Shrinkage and settlement generally occurs in the first few months of the commissioning of a transformer. If the coils are not severely in position, it will lead to repetitive movement of the coils also the layers and turns that in turn will cause abrasion and wear and finally breakdown of insulation. To conquer this, modern transformer coils are frequently pre-shrunk. The first presented opportunity should be taken, preferably after six months or one year after than commissioning, to drive in the wedges and tighten up the pressure screws in which they are given. Core clamping bolts and test nuts should be tightened, as well all bolted electrical joints. Attention should be provided to clean up the tap-changing switch contacts and mechanism. later than a careful test the core should be lifted and internal connections put back, lowered into the tank, fresh oil filled in and top cover bolted in position. Before closing the cover, ensure that no spanners or tools are unintentionally left inside. The oil might after that circulated by an oil purifier and the transformer dried out until all moisture has been driven out. The transformer might after that subject to like several tests as feasible relies on the test facilities available. A load test would be specifically useful. In which an industry, railway or electric supply authority has a large number of transformers to maintain, it is clearly advantageous to make a periodical overhaul (POH) programme, maintaining a few spare transformers of dissimilar capacities for being sent out to work in place of another transformers to be brought into the central workshop one after other for POH. The work load on the workshop will be consistent during the year and no transformer will be left ignored for long periods until it breaks down.

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