Abstract
To provide a more convenient and efficient method for detecting partial discharge (PD) on XLPE cables, this paper describes a 0.1 Hz cosine-square wave testing system, which can output peak voltage up to 30 kV. Due to L-C series resonance principle, the wave of discharge process is in cosine form which can be equivalent to AC voltage. Therefore, PD detection can be conducted under the rising and falling edges. The vital component of the proposed system is high-voltage semiconductor switch which consists of several series connected IGBTs. Based on the idea of compactness, a prototype system is integrated in the lab. Withstand test and PD detection test are also carried out to validate the proposed system. The experiment result shows that the system is effective to detect PD signal in power cables and has certain development prospects on insulation condition assessment of XLPE cables.
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