Local discharging detection method of insulating draw bar based on electric field calculation and X-ray excitation

Abstract

The invention discloses a local discharging detection method of an insulating draw bar based on electric field calculation and X-ray excitation. The method comprises the following steps: firstly, applying 1.7-time rated voltage to two ends of a to-be-detected insulating draw bar for one minute, then reducing the voltage to 1.3-time phase voltage, and detecting the local discharging; determining that the insulating draw bar is unqualified if the local discharging is detected; maintaining the voltage if no local discharging is detected, and performing X-ray scanning on the insulating draw bar from a grounding end of the insulating draw bar from bottom to top by virtue of an X-ray generator; and detecting the local discharging when the X-ray scanning is performed on one position, wherein if the local discharging disappears when the X-ray leaves the position, the insulating bar has a defect on the position, and if no local discharging is detected in the whole process, the insulating draw bar is qualified. Different positions of the insulating draw bar are irradiated by X rays with reasonable intensity, so that the problem that the defect on the position with a low electric field cannot be detected due to non-uniformity of the distribution of the electric field can be solved.

Description

technical field [0001] The invention belongs to the technical field of insulation detection of large electric equipment, and in particular relates to a partial discharge detection method of an insulation pull rod. Background technique [0002] There are many factors that affect the reliability of the high-voltage circuit breaker's operation. Among them, whether the contacts of the high-voltage circuit breaker can be reliably closed or closed is a key factor, and one possibility that causes the contacts of the high-voltage circuit breaker to fail to open and close is to control the SF 6 The insulating pull rod in the operating mechanism for closing and opening the contacts of the high-voltage circuit breaker has failed. There have been numerous instances of circuit breaker failures in power systems due to problems with insulating tie rods. The insulating pull rod belongs to the linkage mechanism in the circuit breaker, and is the linkage part that realizes the operating mech...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a partial discharge detection method based on electric field calculation and X-ray excitation to solve the problems in the prior art that micro-cracks cannot be detected or defects in low-voltage field pull rods cannot be detected. It is simple and easy. It is practical and effective, and can accurately judge whether there are micro-cracks inside the insulating rod, its size and the position of the micro-cracks

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