A vibration signal simulation method and device for latent mechanical faults of a high-voltage circuit breaker

Abstract

The invention discloses a method and apparatus for emulation of a latent mechanical fault vibration signal of a high voltage circuit breaker. The method involves the multi-body dynamics simulation ofa high voltage circuit breaker and the finite element simulation of a vibration signal, and includes the steps of firstly, determining a high voltage circuit breaker multi-body dynamics model parameter and a bracket finite element model parameter through a rod piece force test and a bracket vibration signal test under the normal operation of a high voltage circuit breaker; and secondly, modifyingthe parameter in the multi-body dynamics model to simulate a mechanical fault of the high-voltage circuit breaker to conduct emulation, extracting force curves of a bracket and other components at respective connection positions under a fault condition, loading the force curves into the bracket finite element model as the excitation to make emulation, and extracting a vibration signal of a selected measuring point on the bracket under the fault condition. By analyzing the obtained vibration signal of the latent mechanical fault of the high voltage circuit breaker through emulation, the methodand apparatus in the invention can obtain fault characteristics of the high voltage circuit breaker quickly, which has a positive significance for fault detection and product development.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering, in particular to a vibration signal simulation method and device for a latent mechanical fault of a high-voltage circuit breaker. Background technique [0002] In power system, high voltage circuit breaker is extremely important equipment. When the system is running normally, the high-voltage circuit breaker is responsible for putting the equipment or line into or out of operation, and plays a control role; when the system fails, it is responsible for cutting off the faulty part, ensuring the normal part of the operation, and playing a protective role. Therefore, as one of the key equipment in the power system, the high-voltage circuit breaker shoulders the dual tasks of control and protection. It has a large number and a large investment in substation equipment, and its operation reliability is related to the safe operation of the power system. Statistics on the consequences of h...

AI Technical Summary

Problems solved by technology

Relevant statistics show that more than 30% of substation maintenance costs are spent on routine maintenance of high-voltage circuit breakers. Overhaul is not only time-consuming but also expensive; a considerable part of high-voltage circuit breaker failures are caused by incorrect maintenance.

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