System for detection and analysis of partial discharges under transient voltage application
DOI:
https://doi.org/10.5324/nordis.v0i23.2460Abstract
A measuring system for detection and analysis of partial discharges (PD) in electrical insulation under fast repetitive pulse voltage application has been developed. Partial discharges can be triggered by transient voltages and are considered as being one initial cause of insulation failure.
The experimental setup consists of a specially designed pulse generator for generation of fast voltage transients. The pulses are unipolar, with the peak variable voltage of up to 10 kV and with an adjustable frequency from 0 Hz to 1.7 kHz, burst frequency of up to 2 MHz.
Partial discharge inception under pulse voltage application was determined by data acquisition by means of a standard oscilloscope and suitable data analyses in Matlab, using wavelet transform and denoising techniques. The measurement results are presented in a partial discharge classification pattern designed to be used in connection with fast repetitive pulses as originating from power electronics.
The feasibility of the test system for insulation diagnostics was illustrated by application to twisted pairs of enamelled winding wire.
The test system is suitable for achieving new results to get better knowledge of degradation mechanisms in insulating materials exposed to fast transients from eg. power electronics.
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