Space charge measurement in polymer insulated power cables using flat ground electrode PEA

Fu, M. and Chen, G. (2003) Space charge measurement in polymer insulated power cables using flat ground electrode PEA. IEE Proceedings A - Science, Measurement and Technology, 150 (2). pp. 89-96. ISSN 0143-702X

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Abstract

Data processing methods used to accurately determine the space charge and electric
stress distributions in DC power cables using the pulsed electroacoustic (PEA) system are
described. Due to the coaxial geometry and the thick-walled insulation of highvoltage cables, factors such as divergence, attenuation and dispersion of the propagated acoustic pressure wave in the PEA can strongly influence the resultant measurements. These factors are taken into account ensuring accurate measurements to be made. Most importantly, a method is presented to determine the electric stress profile across the insulation due to both the divergent applied field and that as a consequence of trapped charge in the bulk of the insulating material. Results of spacecharge measurements and the corresponding derived electric stress distributions in XLPE DC
cables are presented.

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