Partial discharge (PD) pulse current detection is the most basic and effective method for quantitatively characterizing discharge intensity of gas-insulated switchgear method(GIS) and gas-insulated transmission line (GIL). However

the pulse current method has a low detection frequency and poor anti-interference ability

resulting in a low sensitivity during on-site application. Therefore

in this paper

a PD detection method based on high-potential pulse current is proposed. The PD measurement unit is connected in series with the high-voltage conductor to suppress the interference coupling from ground wire and to enhance the PD signal coupling

so that the anti-interference ability and sensitivity of PD measurement can be improved. Furthermore

a 500 kV actual GIS test platform is built to verify the sensitivity and anti-interference ability of the proposed method

and PD tests for different types of defects are conducted. The result shows that

under complex interference test environment

the sensitivity of the traditional method is only about 20 pC

while the minimum measurable apparent charge of the proposed method can be as low as 0.5 pC. The high-potential measurement method has higher anti-interference ability

and its noise suppression ratio is about 10 times that of traditional method. PD measurement results show that the high-potential measurement method can achieve effective detection for different types of defects

and the detection effectiveness is better than traditional pulse current method and UHF method. This study provides a foundation for the application of PD quantitative detection in GIS/GIL under complex field interference.