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In this paper, the insulating void defect inside the insulating spacer of onsite 252kV GIS is analyzed by ultra-high frequency (UHF) partial discharge (PD) diagnosed method and industry CT apparatus. The defect position of onsite GIS is located by using the time difference of arrival (TDOA) method of UHF signal. The pulse current method and UHF method is combined together to investigate the variation...
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