The influence of winding type on the recognition of partial discharges

Abstract

An instrumentation scheme is proposed for the acquisition of waveforms during the lightning impulse test on transformers. Three filters segregate the response into distinct frequency bands. As partial discharge signals primarily influence the high frequency behaviour, experiments are reported on disc, interleaved disc and layer windings.

A Correlation Method for Detection of Partial Discharges in Transformers

“…While the method has been validated on a physical model representing a winding, experimental results on PD responses have also been reported on typical layer, disc and interleaved disc windings [6]. It is possible to estimate the location of PD within windings based on a correlation approach.…”

A Lock-in Technique for PD Measurement during Impulse Tests

“…This enables a clear identification of PD. While this is a layer winding PD signals with disc and interleaved disc winding were shown in [21]. The experiment was performed at low voltage because that is the only manner in which a comparison with an external lock-in amplifier could be performed.…”