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Return to Session PARTIAL DISCHARGE DETECTION IN POWER CABLES: PRACTICAL LIMITS AS A FUNCTION OF CABLE LENGTH

Power cables behave as transmission lines as regards partial discharge (PD) pulse propagation. Attenuation and dispersion phenomena have, therefore, great influence on the detectability of PD pulses, particularly when long cable routes and detection from terminals are considered. This paper presents an approximate model to infer PD pulse waveform as a function of the distance travelled along the cable and shows results that can provide practical limits for PD detection in cable routes when using IEC 60270compliant and/or ultra wideband detectors. Considerations on the effect of calibrator characteristics on sensitivity check procedures are, eventually, reported.