The transformer is a vital apparatus in the electrical equipment in every stage viz. Generation, transmission, distribution and utilization of electricity. Failure of a transformer in the chain causes interruption in electricity supply and dislocation of all the works going on. Care and maintenance of the transformer therefore requires attention from time to time to avoid sudden, unpredicted failure. If a developing defect is detected early, remedial action can be taken immediately and service continuity of the transformer maintained.

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