Impact of moisture migration on the current rating of high operating temperature power cables

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Description/Abstract

Operating temperatures of conventional high voltage transmission cables are generally restricted to 90°C in order to prevent thermal damage occurring to the XLPE dielectric. However new polymeric dielectrics may allow higher conductor temperatures, potentially increasing the current rating of the cable circuit. For buried cables this increases the rate of moisture migration away from the cable circuit, thus increasing the ground thermal resistivity. This paper outlines the development of a dynamic backfill model which permits moisture migration to be modelled explicitly. The model is then used to determine the likely magnitude of rating increase available from the deployment of high temperature cables on the transmission network.