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Power transformers are in service under different environmental, electrical, and mechanical conditions  and may be subject to enormous hazards during the course of operation , . They are commonly considered to be the heart of the transmission and distribution sectors of electric power systems; monitoring their condition and diagnosing faults are important parts of the maintenance function . Utility engineers strive to keep power transformers in service and to prevent even shortterm outages. Failure of a transformer can cause extensive damage to equipment owned by consumers or the utility .
Date of Publication: May-June 2013