GIL fault transient ground potential rising waveform characteristic moment extraction method and system and medium

• Main Authors: MAO LEI, YU JIANHUA, CAI JINJING, YE CHAO
• Format: Patent
• Language: Chinese; English
• Published: 18.11.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to a GIL fault transient ground potential rising waveform characteristic moment extraction method and system and a medium, and provides a transient ground potential rising waveform generated at the end part of a sleeve when a high-voltage GIL insulation fault occurs by arranging a transient ground potential rising measuring point on an external shell near a GIL outgoing line sleeve. A Mexican Hat function is used as a mother wavelet to carry out continuous wavelet transformation on a transient ground potential rising waveform, a maximum instantaneous frequency curve is obtained through frequency search, and then a local maximum value of the maximum instantaneous frequency curve is extracted; characteristic moments corresponding to the first local maximum value and the second local maximum value correspond to the time when the transient voltage reaches the end part of the GIL for the first time and the second time, so that the method can be used for accurately positioning a fault. Accordi