Device and working method for judging the closing and opening state of the closing and opening mechanical contacts of the circuit breaker

Abstract

The invention relates to a device for judging the closing and opening states of the closing and opening mechanical contacts of a circuit breaker. The first static contact and the second static contact, when the circuit breaker is closed, the transmission shaft drives the end of the linkage contact rod to only contact the first static contact; when the circuit breaker is open, The transmission shaft drives the end of the linkage contact rod to only contact with the second static contact; the first and second static contacts are connected to the I / O interface of the single-chip microcomputer through the signal processing circuit; the single-chip microcomputer The signal received by the interface judges the closing and opening status of the circuit breaker in real time, so as to control the conduction time of the current of the permanent magnet coil of the circuit breaker, and complete the intelligent control of the circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of state monitoring of power transmission and transformation equipment, and relates to a device for judging the closing and opening states of mechanical contacts of a circuit breaker and its working method. Background technique [0002] Among the high-voltage switches in the power system, most of the vacuum circuit breakers using permanent magnet mechanism switches have the advantages of less mechanical parts, long life, maintenance-free, stable and reliable, reliable operation of the mechanism, and fast opening speed. [0003] When the permanent magnet coil of the existing circuit breaker (including the vacuum circuit breaker) is energized and operated, due to the action of electromagnetic force, the drive shaft of the circuit breaker is driven to move axially, so as to achieve the purpose of closing and opening. However, due to mechanical jitter during the closing and opening process, how to accurately det...

AI Technical Summary

Problems solved by technology

like figure 1 as shown, figure 1 The waveform shown is the current state waveform in the permanent magnet coil detected from closing to opening of the circuit breaker. The actual waveform is mixed with a lot of stray interference or clutter caused by mechanical vibration. If these clutter disappear After judging the switch state of the circuit breaker, there will inevitably be a delay for a period of time, which affects the precise control of the circuit breaker

[0004] Existing designs use high-cost displacement sensors or Hall sensors to achieve this goal. These methods are expensive, and the mechanical vibration generated by the circuit breaker during the action process is prone to misjudgment

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