Comparison of charge estimation methods in partial discharge cable measurements

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COMPARISON OF CHARGE ESTIMATION METHODS IN PARTIAL DISCHARGE
CABLE MEASUREMENTS
ABSTRACT
The aim of this paper is to compare different partial discharge (PD) charge estimation
methods for PD cable measurements. The paper covers the mathematical foundation behind the
different presented methods, and explores the limits of each method regarding the associated
maximum charge estimation errors in PD cable measurements. The results are focused on long
cables where large PD pulse distortions are present and therefore, the measured pulses differ
significantly from the calibrator ones. Each proposed method is analyzed, and finally, limitations
of each method are discussed.

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Partial discharge (PD) refers to localized electrical discharges that only partially bridge the insulation between conductors. PD measurements allow identification and monitoring of insulation defects to improve condition-based maintenance of electric machines. Nidec ASI offers PD detection instruments and sensors that digitally acquire and analyze PD pulse shapes to separate sources, identify defect types, and assess risk to inform maintenance programs. Case studies demonstrate using on-line PD monitoring to evaluate distributed micro-void defects in the insulation of a large generator.

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