Breaker contact performance monitoring method and device and monitoring system

Abstract

Embodiments of the invention disclose a breaker contact performance monitoring method and device and a monitoring system, and relate to the technical field of power grids. The breaker contact performance monitoring method comprises the following steps of: receiving real-time voltage, acquired by a voltage acquisition device at the current moment, of a wire-in end and a wire-out end at two ends ofa breaker contact; calculating a difference value between the real-time voltage at the current moment and expected voltage at the current moment, and when the difference value is greater than a presetfirst threshold value, determining the current time as an arcing start moment, wherein the expected voltage is determined through a preset voltage calculation manner; continuously calculating and recording real-time voltage changes of adjacent moments, determining a real-time voltage change of each adjacent moment, and if the real-time voltage change rates of continuous preset times of adjacent moments are smaller than a preset second threshold value, determining the current moment as an arcing stop moment; and determining arcing times and deducing health performance of the breaker contact according to each arcing time. Through the breaker contact performance monitoring method and device and the monitoring system, arcing times of contacts can be monitored in real time so as to grasp the health of the contacts in real time, so that important parameters are provided for the state monitor and life estimation of breakers.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method, device and monitoring system for monitoring the performance of circuit breaker contacts. Background technique [0002] At present, there is a lack of monitoring means for circuit breaker contacts. In the design and manufacture stage of the circuit breaker, the monitoring of the contact condition is only to check the contact pressure and contact material. However, in the actual use process, there is currently no reliable method to monitor whether the pressure and contact performance of the contacts are normal after the contacts have been opened and closed many times. Contents of the invention [0003] In view of this, the embodiments of the present invention provide a circuit breaker contact performance monitoring method, device and monitoring system, which at least partly solve the problems existing in the prior art. [0004] In the first aspect, an embodiment o...

AI Technical Summary

Problems solved by technology

However, in actual use, there is currently no reliable method to monitor whether the pressure and contact performance of the contacts are normal after the contacts have been opened and closed many times.

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