Abstract
To improve the reliability of Medium Voltage (MV) power cables in distribution electricity companies networks, Partial Discharge (PD) measurements are performed on-site using Very Low Frequency (VLF) as energizing source. Several different VLF waveforms are utilized with the most common being sinusoidal and cosine-rectangular. Using of VLF-PD as a diagnostic technique to investigate the condition of power cables requires understanding the nature of dependency of the PD activity on the frequency and wave shape of applied voltage. Many of works investigated the behaviour of PD activity due to an artificial cavity within XLPE power cables at 50 Hz of sinusoidal applied voltage practically and theoretically, but it is still not so much work in this scope under different wave shapes and frequencies of testing voltage. This paper is introduced to participate in understanding the impact of these two factors on PD behaviour experimentally through performing of PD measurements on XLPE cable sample 12/20 kV–1×400 mm2 with an artificial cavity as well as theoretically using COMSOL and MATLAB software to carry out the simulation based on the Finite Element Method (FEM). The practical and theoretical results are compared together and show good agreement between them.
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