GIS switch fault diagnosis method based on radiating electric field measurement via switching operation

Abstract

The invention relates to a GIS switch fault diagnosis method based on measurement of a radiating electric field of VFTO (Very Fast Transient Overvoltage) generated by switching operation. The method comprises the following steps that (1) the radiating electric field of the VFTO generated by switching operation in a GIS is measured; (2) the step (1) is repeated to measure the radiating electric field after multiple times of switching operation, and accumulated measuring data is summarized to obtain a standard radiating electric field oscillogram of the switching operation when the GIS is in a normal state; and (3) the state of the GIS is monitored, and when the pulse waveform of the radiating electric field of the VFTO generated by corresponding switching operation is different from the standard radiating electric field oscillogram obtained in the step (2), it can be determined that a switch in the GIS has an insulation fault. Thus, the electric-field pulses measured by the method are proved to be highly effective and accurate according to repeated experiments.

Description

technical field [0001] The invention relates to a GIS internal switch fault diagnosis method based on the measurement of the VFTO radiation electric field generated by the switch operation. Background technique [0002] In order to carry out condition monitoring and fault diagnosis on GIS, there are two types of monitoring methods: electrical measurement method and non-electrical measurement method. Among them, the electrical measurement method includes coupling capacitance method and ultra-high frequency method; Detection method and optical monitoring method. [0003] The coupling capacitance method cannot identify PD signals mixed with various noises during on-site testing; the signal detected by the ultra-high frequency method attenuates too fast, and has high requirements for sensors and is expensive; the signal mode of the ultrasonic monitoring method is complex, The high-frequency part attenuates quickly and requires more sensors; the chemical monitoring method is eas...

AI Technical Summary

Problems solved by technology

[0003] The coupling capacitance method cannot identify PD signals mixed with various noises during on-site testing; the signal detected by the ultra-high frequency method attenuates too fast, and has high requirements for sensors and is expensive; the signal mode of the ultrasonic monitoring method is complex, The high-frequency part attenuates quickly and requires more sensors; the chemical monitoring method is easily affected by the adsorbent and desiccant in the GIS, and its sensitivity is very poor; the optical monitoring method is not sensitive to the reflection caused by the smooth inner wall of the GIS

To sum up, the existing technology cannot fully adapt to the technical requirements of GIS fault diagnosis and condition monitoring, which are accurate, efficient and widely applicable.

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