In view of the high insulation failure rate of 6-35 kV cables,the principle of oscillation wave partial discharge detection technology and the characteristics of different high-voltage excitation power sources were discussed. A modular AC withstand voltage and oscillation wave partial discharge detection system was proposed. Its working flow was introduced,and the method of diagnosing the cable insulation state was analyzed. This technology was used to detect the 6-35 kV cables in a certain enterprise. The results showed that this technology can effectively detect cable insulation defects and accurately locate fault points. The modular AC withstand voltage and oscil-lation wave partial discharge detection technology can be flexibly assembled according to the length of the tested cables,and oscillation wave partial discharge detection can be carried out while completing the AC withstand voltage test,which can detect and locate potential insulation defects in the cable and improve maintenance efficiency.
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