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Transformer Riddle No. 13 – Partial Discharge Detection

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  • #208

      Hi I was hoping someone can assist me with some information regarding methods for detecting partial discharge in transformers and power cables.

      From what i can find there seems to be two methods. Use a radio frequency current tranformer (RFCT) in which a rogowski coil is used as a CT to measure changes in current as a result of PD. The other method seems to be using 80pF coupled capacitors.

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    • #1429

        A partial discharge is an electrical discharge that only partially bridges the insulation between conductors. Such a discharge is generally considered to take place as a precursor to total insulation failure but may exist for a long period of time, possibly years, before total breakdown occurs. In some circumstances the existence of the discharge will modify the stress distribution so as to initially reduce the tendency to total breakdown. In time, however, total breakdown will always result, often because the discharge itself leads to chemical breakdown of the insulation which reduces its electrical strength. Clearly, in a healthy transformer under normal operating conditions the only acceptable level of partial discharge is nil.

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