Partial Discharge Fault Location on Power Transformer

Partial discharge (PD) is one of the first signs of a deteriorating insulation system and can lead to costly repairs or even failure of medium and high voltage (HV) equipment. Therefore, partial discharge measurements are vital concerning the quality assessment of high voltage products such as power/distribution transformers, cables, bushings, gas-insulated switchgears, and many others.

Among high voltage equipment, large power transformers have an insulation system with relatively high complexity. Compared to other HV assets the inner components of a transformer are not accessible. For this reason, testing is limited to the terminals and tank wall. Concerning detection of the PD activity during Factory Acceptance Test (FAT) or when the transformer is in service, the data regarding the fault location is very helpful for maintenance. This webinar explains general root causes of PD in power transformers and methods to locate the PD.

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