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Transformer oil is a highly-refined mineral oil. It is stable at high temperatures and has excellent electrical insulating properties. It is used in oil-filled transformers, some types of high voltage capacitors, fluorescent lamp ballasts, and some types of high voltage switches and circuit breakers. Its functions are to insulate, suppress corona and arcing, and to serve as a coolant.
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Transformer Seal Tags have a self-laminating front polyester cover to protect the written information and a 1/4″ brass eyelet.
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In transformer testing, the transformers are tested with ac or dc voltage. Overall ac voltage is preferable to dc voltage for testing transformers because ac voltage simulates the internal stress that the transformers experience during operating conditions. Certain tests are routinely conducted in the field of the transformer testing such as insulation resistance tests, ac or dc high potential, insulation power factor test, transformer turns ration test, polarity test, excitation current test and induced potential test.
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