Abstract
Polyethylene is widely used as an insulating material (especially as cable insulation); therefore, of interest are ionization aging processes that cause its breakdown. For cable diagnostics, the partial discharge (PD) technique is used. In particular, PD characteristics may help in identifying the type of a defect [1]. Theoretical and experimental studies where the stage of dendrite growth in polyethylene was judged from the sequence of PD occurrence phases according to an applied voltage were summarized in [2]. It was concluded that this sequence is strictly determinate for either half-wave of the voltage when dendrites start to grow. Practical experience shows, however, that these processes are of stochastic nature and PD phases can hardly be reproduced regularly, as exemplified by our measurements.
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