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A pulsed electro-acoustic equipment system was devised to measure the space charge of a power cable under 50 Hz AC stress and a high temperature gradient by adopting a new phase-matching method. Space charge profiles were recorded on a 10 kV cable with cross-linked polyethylene insulation. The AC period was resolved in 32 phase angles, while the cable underwent electrical-thermal aging for 16 days...
The space charge distributions of different ZnO varistors have been investigated using pulsed electro-acoustic (PEA) method in this paper. There were 8 kinds of ZnO varistors samples sintered under 4 different sintering temperatures with two formulas. According to the experimental results, it was found that there is space charge distribution when the sample is applied with a DC voltage, and the space...
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