Circuit breaker mechanical characteristic on-site live-line test method based on NCC-P-S optimization algorithm

Abstract

The invention discloses a circuit breaker mechanical characteristic on-site live-line test method based on a normalized cross correlation image pyramid sector matching (NCC-P-S) optimization algorithm. The method comprises the following steps: installing a circuit breaker mechanical characteristic parameter live-line test specific device, adjusting device parameters and starting the test process;capturing a high-speed image sequence associated with movement of a moving contact by utilizing a high-speed camera, and determining some characteristic part on a main shaft or a crank arm of a circuit breaker body as a motion recognition target; identifying the moving object through the NCC-P-S optimization algorithm to obtain movement trajectory of an insulated connecting rod or the main shaft;modifying small vibration of the center of circle through a multi-target linkage center location method, and calculating main shaft rotation angle through a multi-target linkage weighted discrimination method; and finally, calculating mechanical characteristic parameters of a circuit breaker through association relation between the main shaft and the moving contact. The method is a new non-contactcircuit breaker mechanical characteristic test method, can solve the problem of sensor installation, and can realize live test of circuit breaker mechanical characteristic parameters.

Description

technical field [0001] The present invention relates to the technical field of electrical equipment testing, in particular to a method for identifying the moving track of a circuit breaker moving contact through a normalized cross-correlation image pyramid sector matching (NCC-P-S) optimization algorithm, and then obtaining the mechanical characteristic parameters of the circuit breaker . Background technique [0002] The operational reliability of high-voltage circuit breakers is crucial to the protection and control of power grids, and the mechanical characteristic parameters are important indicators for evaluating the operating performance of circuit breakers. The national standard GB1984-2003 stipulates that the mechanical characteristics of the circuit breaker must be strictly tested after the factory inspection and on-site maintenance. The main parameters include: opening (closing) time, opening (closing) synchronism, opening distance, overtravel, just opening (closin...

AI Technical Summary

Problems solved by technology

The operation process of the circuit breaker is captured by a high-speed camera, and thousands of frames of high-speed image sequences are obtained. It takes a lot of time to transmit and process a large number of high-resolution images. In the case of high requirements for the speed and accuracy of the matching algorithm, the existing grayscale-based Although the normalized cross-correlation matching (NCC) algorithm has high matching accuracy and is not affected by the linear transformation of gray values, it has a large amount of calculation and slow running speed, which affects the actual application in the field.

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