Electrical insulation diagnostics for high voltage power cable systems based on voltage excitation at very low frequency

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High voltage power cable systems rely on their insulation to withstand very severe electric stress without breakdown. Field testing of cables at normal frequency is not feasible, but with very low frequency excitation from mobile sources such testing is possible. The overarching aim of this project is to develop methods for interpretation of results from such measurements. It is intended that this will enable formulation of appropriate test procedures and better assessment of insulation conditions in service-aged cables. Also of considerable significance to fundamental research will be the project’s goal of a better physical understanding of insulation material behaviour when subject to very low frequency electric stress.