This month’s Featured Technical Paper is from the Proceedings of the 2019 International Conference of Doble Clients. The paper is titled: Testing XLPE Insulation Health of Distribution Cables.
A non-destructive cable testing technique for power distribution cables with cross-linked polyethylene (XLPE) insulation has been developed at the National Research Council of Canada, based on the polarization and depolarization current measurement principle. This technique can be applied on site with non-destructive test voltages, thus reducing the chance of cable failure during or after testing. Using the high frequency component of the depolarization current waveform acquired on site, a parameter QDep has been determined in order to assess the relative aging condition of the cable. As such, cables with excessive aging condition have been deemed in poor condition and will be prioritized for replacement. This technique has been useful in the Hydro Ottawa network as an asset management tool for the development of cable replacement strategies.
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