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What do you mean by the term “Dielectric losses” ?


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The dielectric loss is a power loss which occurs in the paper insulation (dielectric) of a cable as a result of the electric field developed due to the leakage current and the reversal of current in case of a.c. supply. This loss increases with temperature. It has a direct bearing on the operation of a cable. A specific cable has a definite heat dissipating ability at its operating temperature. Therefore, any increase in dielectric loss will result in a decrease in load carrying ability. Dielectric losses are usually negligible for cables operating upto 33 kV.


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