Application of partial discharge measurement on laboratory aged low voltage cables

The partial discharge (PD) measurement has been developed for medium and high voltage cables to determine the condition of the insulation. Less attention was paid to diagnostics of low voltage cables, while the low voltage control cables act very important role in safe operation of e.g. power plants. By the results of authors, the partial discharge measurement can be applied for low voltage cables, too. Especially, this method can indicate the degradation effected by thermal stress on PE insulated low voltage control cables. In this article, the result of PD measurement on low voltage cables was examined. By using of statistical methods the general state of cables can be determined more precisely.