High-voltage breaker mechanical characteristic fault probability monitoring method and system based on on-line monitoring

Abstract

The invention discloses a high-voltage breaker mechanical characteristic fault probability monitoring method and system based on on-line monitoring. The method comprises the steps that (1) the mechanical characteristic curve of the breaker is read by an on-line monitoring system under the normal circumstance of the breaker; (2) when the breaker is put into operation in the field, the mechanical characteristic curve of the breaker is read by the on-line monitoring system under the operation circumstance of the breaker; (3) fault probabilities, of energy storage motor fault probability, tripping fault probability and closing fault probability, showed by all characteristic values are respectively calculated by the on-line monitoring system; (4) the total on-line monitoring fault probability, namely, the sum of the fault probabilities worked out according to the third step: F=FM+FF+FH, of the breaker is calculated; (5) whether alarming should be conducted or not is judged by the on-line monitoring system according to the fault probabilities, and a fault alarming signal is generated by the on-line monitoring system when the fault probability is equal to or larger than an threaded alarming value and is not generated by the on-line monitoring system when the fault probability is smaller than the threaded alarming value.

Description

technical field [0001] The invention specifically relates to a method and system for monitoring the failure probability of mechanical characteristics of a high-voltage circuit breaker based on online monitoring. Background technique [0002] Circuit breakers play a vital role in the power grid and are key equipment for effective control of the power system. With the development of society and economy, higher requirements are placed on the safety and reliability of the power system, but in The unplanned power outages caused by circuit breaker failures in power supply and distribution systems account for more than 60% of the total power system outages, and are one of the main factors affecting the safety and reliability of power systems. The mechanical characteristic faults of high-voltage circuit breakers can be summarized into three categories (excluding insulation system faults): [0003] 1) Failure of the energy storage system, including the failure of the energy storage ...

AI Technical Summary

Problems solved by technology

With the application of the online monitoring system, people have carried out various algorithm research on the obtained mechanical characteristic data, including the EMD and SVM algorithm analysis of the circuit breaker vibration sound wave, the D-S evidence theory analysis of the mechanical characteristic data, etc. These methods are mainly for the Research on the mechanical characteristic data after the failure occurred, and did not give early judgment and early warning of the failure

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