Mechanical property detection method of non-contact breaker

Abstract

The invention discloses a mechanical property detection method of a non-contact breaker, An industrial high-speed camera is used for taking pictures on one certain feature point on a mechanism operation connecting rod in a breaker operation mechanism case, a two-dimensional movement track of the connecting rod can be obtained by computing and analyzing the picture through software so as to measure the mechanical property of a breaker mechanism. The normal brake opening / closing process of the breaker or the brake opening / closing process under abnormal conditions can be monitored through the combination of the high-speed camera and a Hall current sensor to obtain the movement track of the operation mechanism connecting rod so as to obtain the two-dimensional travel and speed curve of the mechanism, a technicist can accurately judge whether the mechanical property of the mechanism is in abnormal. And furthermore, the sensor in the method is free from being contacted with a movement part of the breaker operation mechanism, the normal operation of the breaker operation mechanism cannot be influenced by external components; and therefore, the method has the advantages of being real-time in monitoring, efficient, reliable, high in precision and non-contact.

Description

technical field [0001] The invention relates to the category of a non-contact detection method for the mechanical characteristics of an operating mechanism of a circuit breaker, and is particularly applicable to the technical field of detection methods for the mechanical characteristics of opening and closing of a circuit breaker under electrified conditions. Background technique [0002] High-voltage circuit breakers play a vital role in the operation and control of power grids, and their operation, maintenance and overhaul are closely related to the reliability of the entire system. The International Conference on Large Power Grids (CIGRE) conducted a reliability survey on the 66kV and above single-pressure SF6 circuit breakers that had been put into operation from 1988 to 1999. A total of 70,708 units per year, the number of failures caused by operating mechanism failures accounted for the total number of failures 64.8% of the total, of which the secondary electrical cont...

AI Technical Summary

Problems solved by technology

At present, there is a lack of systematic understanding of the laws between the internal faults of circuit breakers and their external characteristics. The research on the relationship between the energy storage of circuit breakers, abnormal operating mechanisms and mechanical motion characteristics during operation is not deep enough, and the mechanism of the occurrence and development of faults is still unclear. Not very clear, the reason is that the existing testing technology and analysis methods are limited by the inherent thinking mode

In the current power system, the system for monitoring circuit breakers is complex and redundant in part of the structure and monitoring methods, and the ability to process and compare data is poor, which reduces the safety and stability of the power system

In the test of mechanical characteristics of circuit breakers, grating sensors and conductive plastic potentiometers are often used to measure the stroke of the moving contact. In principle, it is not separated from the "contact" measurement. Not only the accuracy of the sensor itself is not high, but also the installation of the fixture is cumbersome, and it is difficult to fully describe the trajectory of the moving contact. , In addition, the movement of some transmission mechanisms is in an arc instead of a straight line, and the stroke sensor measures the total stroke instead of the stroke in a certain direction, resulting in inaccurate measurement results

At the same time, this kind of sensor is in direct contact with the moving parts of the mechanism. During the high-speed opening and closing process of the circuit breaker operating mechanism, it is easy to cause other defects and failures due to loose sensor installation or signal transmission line problems, which greatly affects the safe and stable operation of the circuit breaker. Hidden danger

[0003] Based on the above situation, this patent proposes a non-contact circuit breaker mechanical characteristic detection method, which overcomes the problems of insufficient precision and inconvenient installation brought about by the traditional mechanism characteristic test method, and avoids the contact method at the same time. Security risks posed by sensors

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