Methods of characterisation of DC partial discharge in polymeric cable insulation

Morris, Euan A. and Siew, W.H. and Given, Martin J. (2018) Methods of characterisation of DC partial discharge in polymeric cable insulation. In: 2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, Piscataway, NJ. ISBN 9781538661925

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    Abstract

    Partial discharge monitoring is frequently used in AC cable systems, and there exists a strong desire for the same for DC cables within the electrical power industry, given their recent increased use. However, DC PD is a less well understood phenomenon. This paper provides analysis of three methods of partial discharge characterisation: pulse duration and amplitude analysis, frequency-domain spectra analysis, and partial discharge inception voltage analysis in artificially-created voids in polymeric cable insulation samples (polyethylene and polypropylene) under both AC and positive and negative DC excitations. From these a ‘finger-print’ of the defects can be determined based on the distribution of energy within the discharge frequency spectrum, and the inception voltage.