Fault diagnosis and degree evaluation method of frame circuit breaker based on operating accessory current

Abstract

The invention relates to a frame-type circuit breaker fault diagnosis and degree evaluation method based on operating accessory current. The method includes the steps of firstly determining the working stages, including an energy storage stage, a closing stage and an opening stage, of the circuit breaker to be diagnosed and evaluated, then using the current of an energy storage motor to diagnose fault during the energy storage stage, and using the current of a closing coil to diagnose fault during the closing stage, using the current of the opening coil to diagnose fault and assess degree during the opening stage, respectively detecting the current signals of the energy storage motor during the energy storage stage, the current signals of the closing coil to diagnose fault during the closing stage and the current signals of the opening coil during the opening stage, conducting fault diagnosis with a multi-core support vector machine, and accurately determining the fault degree through a fault degree characteristic curve when the degree of the fault diagnosed has to evaluated.

Description

technical field [0001] The technical solution of the present invention relates to the fault diagnosis and degree evaluation of a circuit breaker, in particular to a method for fault diagnosis and degree evaluation of a frame type circuit breaker based on the operating accessory current. Background technique [0002] With the rapid development of the national economy, ordinary users have also begun to put forward higher requirements for power quality. The low-voltage distribution network is the terminal power grid of the transmission network, which is directly connected to the majority of users. It is very important to connect the transmission network and users. It is the key to distribute and regulate electric energy to the majority of power users in the power system. The operation and maintenance level and health of the low-voltage distribution network often directly determine the quality of power consumption of power users. The key equipment frame circuit breaker in the lo...

AI Technical Summary

Problems solved by technology

At present, most of the research on the degree of failure is limited to the orderly classification of the degree of failure, that is, the use of intelligent identification algorithms to identify faults with a fixed degree. The degree of misjudgment will affect the grasp of the working state of the circuit breaker in the slightest, and cause power outages and major economic losses in severe cases.

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