Measuring PD under Fast Slew Rate, High Voltage and High Frequency Repetitive Voltage Impulses

Abstract

Increasing specific power in emerging assets, as those for electrification transport, is a must that is substantiated through the use of power electronic drives, having increasingly higher voltage, switch slew rate and frequency. This paper proposes time-domain based algorithms able to separate and identify PD pulses occurring during voltage impulse rise time, thus very hardly detectable. The paper investigates the validity of such algorithms as a function of voltage amplitude and modulation frequency. The proposed method is effective in extreme conditions where PD pulses and switching noise overlap integrally in the frequency domain, and they are not easily recognizable in the time domain even by an expert eye.