Investigation of slow and fast polarization processes of low voltage cable insulations

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Supervisor:
Dr. Tamus Zoltán Ádám
Department of Electric Power Engineering

To maintain a reliably functioning system, we need to verify its state on a regular basis. For electric cables, this is completed by running multiple tests on the insulation of the samples acquired from the cable sections. Using these tests, the condition of the cable system can be estimated. In my thesis, I examined the dielectric parameters of the low voltage cables. Focusing on the polarization characteristics, I looked for relationship between the condition of the cable and the phenomenon of polarization with different time constants. In the course of the mensuration, I used two methods on the samples to examine the phenomenon with short and long time constants as well. Based on the results of the tests, the polarization with faster and slower time constants could be obtained with different magnitude as function of the time constant. In the evaluation, I determined time constant ranges by statistical methods, which showed the best time constant range for the precise mensuration of the differently degraded PVC insulations examined. For the better understanding of the tests and the conclusion of the first part of my thesis, I revised the main technical knowledge based on the relevant scientific literature.

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