An article providing background on fundamentals of partial discharge, especially as related to field PD testing of cable systems.

Fundamentals of partial discharge in the context of field cable testing

The paper shows that open-loop noise reduction techniques can be effective in separating partial discharge (PD) signals from noise. Wavelet-based denoising through the use of thresholding of wavelet coefficients provides near optimal noise reduction for many classes of signals including PD signals in noise. The effectiveness of wavelet transform-based noise reduction depends on selection of an appropriate wavelet basis function as well as on careful selection of threshold function and levels.

Detection of PD utilizing digital signal processing methods. Part 3: Open-loop noise reduction

PD testing and location is an essential part of factory testing of shielded solid dielectric power cable. The accuracy with which a PD source can be located is limited by high frequency attenuation of PD pulses as they propagate through the cable.

Partial discharge. XXII. High frequency attenuation in shielded solid dielectric power cable and implications thereof for PD location

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On-line detection and location of partial discharges in medium-voltage power cables

This article is the first of a four-part series by the authors that treats various aspects of digital signal processing applied to partial discharge detection. It is shown that manufacturers and users of high-voltage apparatus are interested in on-site, off-line and on-line analysis of partial discharge to identify and locate defects in insulation systems.

Digital signal processing applied to the detection of partial discharge: an overview

Errors in partial discharge (PD) location on high voltage dielectric cables caused by both mechanical and electrical phenomena are discussed. The sources of error relevant to PD location include errors in measuring time delays, scatter caused by noise and disturbances, pulse propagation distortion, errors in cable length measurement, and trivial errors in experimental technique. Experiments to determine typical PD location error were carried out using a detector with a 10 MHz bandwidth. Extensive tests were carried out on a 200 m, 15 kV cable with metering marks on the outer sheath, as well as a 590 m, 10 kV cable without metering marks. >

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A.G. Wiemer

Papers

Partial discharge. XVIII. Errors in the location of partial discharges in high voltage solid dielectric cables