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What is a Partial Discharge?

A Partial Discharge is a partial electrical breakdown in the dielectric material which does not bridge the dielectric between the conductor and the concentric neutral. The unit of partial discharge measurement is the Pico Coulomb (pC). The general factory acceptance criteria for newly manufactured MB XLPE cables is 5pC.

Today P.D. diagnostics provides the Technician with a non-destructive means of evaluating the cable and accessories. These partial discharge locations continue to discharge slowly breaking down the dielectric like a silent cancer. It is just a matter of time, which varies from hours, to days or even years before the cable or accessory will fail. By locating these P.D. sites timeously, corrective measures can be taken before the cable fails thus avoiding power failures and customers outages.

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