Feasibility of using a flat bottom electrode for PEA space charge measurement on mini-cables under high temperatures

Zheng, H., Dodd, S. J., Dissado, L. A., Fothergill, J., Allais, A. & Kebbabi, L. (2013). Feasibility of using a flat bottom electrode for PEA space charge measurement on mini-cables under high temperatures. 2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), pp. 1109-1112. doi: 10.1109/CEIDP.2013.6748261

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Abstract

Pulsed Electro-Acoustic (PEA) apparatus has been developed to measure the space charge distribution inside XLPE based mini-cable insulation. The technique relies on the acoustic contact between the cylindrical cable surface and a flat aluminium plate to couple the acoustic waves to the sensor. This work addresses the feasibility of using this technique over a temperature range of 25°C to 70°C. The results demonstrate that increasing the temperature under constant clamping force causes the cable insulation to soften and distort increasing the contact area and signal from the PEA apparatus. However on subsequent cooling to 25°C the mechanical distortion remains frozen-in with little change to the contact area. For reproducible space charge measurements it is necessary to first condition the cable sample by taking the cable and PEA through a temperature cycle before application of the applied voltage.

Item Type: Article
Additional Information: © 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Vice-Chancellor's Portfolio
URI: http://openaccess.city.ac.uk/id/eprint/3691

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