Abstract:
Partial discharge measurement has become a well-accepted and widespread diagnosis method. The IEC 60270 international standard defines how partial discharge should be measured, i.e. how to quantify partial discharge and how to perform the measurement in a plausible, repeatable, and comparable manner. However, recently measurements outside the frequency range recommended by IEC 60270 have become popular. The higher bandwidth approach claims to provide a higher signal-to-noise ratio due to lower background noise levels. This paper revises the IEC 60270 frequency range limitations and analyses measurements above those boundaries. The theoretical hypotheses are then verified by practical measurements. Limitations of such measurements are discussed, especially for large test objects or test objects with windings.