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What is Partial Discharge in High Voltage Cables, Switchgear, Transformers and Motors?

What is Partial Discharge in High Voltage Cables, Switchgear, Transformers and Motors? Partial discharge is caused by discontinuities and flaws in high voltage electrical insulation and, if left undetected, can eventually lead to the full breakdown of the insulation system. On-line PD testing and monitoring of high voltage plant and cables provides an advance warning of pending insulation failure.

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