Intelligent reclosure breaker and automatic reclosure control method thereof

Abstract

An intelligent reclosure breaker comprises an operating mechanism, a current and electric leakage detection module, a power module, a voltage detection module, an electric reclosure mechanism, a control unit and a signal interaction module, wherein the voltage detection module is connected to the incoming line side of a main circuit and the rear end of a contact device; the signal interaction module is connected with the control unit and used for signal data interaction. According to an automatic reclosure control method, users can set which voltage faults need tripping and which instantaneous voltage faults allow automatic reclosure through the signal interaction module; the control unit carries out automatic judgment and controls whether the operating mechanism carries out tripping or not according to current signals and voltage signals input by the detection modules and threshold value parameters preset by the signal interaction module. After instantaneous voltage or current faults cause tripping, the control unit carries out automatic judgment to determine whether the faults are allowed to be recovered or not according to the voltage signals collected by the voltage detection module after the breaker trips and the threshold value parameters preset by the signal interaction module, and controls the electric reclosure mechanism whether to carry out electric reclosure or not.

Description

technical field [0001] The invention relates to an intelligent reclosing circuit breaker, which can be set and selected by the user according to the needs of different power supply places. Phase failure, zero failure, etc.) or transient residual current failure, automatic reclosing can be performed according to intelligent judgment and control of the fault type before reclosing. Background technique [0002] With the development of low-voltage electrical appliances and the popularization of rural power grid transformation, the traditional residual current operated circuit breaker can no longer meet the requirements of the smart grid due to its single function. Various integrated circuit breakers with automatic reclosing function have appeared in the world, mainly by adding electric operating mechanism to the traditional residual current operated circuit breaker to realize the reclosing function, but because the national standard for reclosing products is not formal The requ...

AI Technical Summary

Problems solved by technology

For example, in the case of thunder, rain and wind, when the line on the power supply side of the circuit breaker is momentarily leaning against a live wire due to wet branches, it will cause the circuit breaker to trip, and the instantaneous voltage of the line will be caused by the lightning strike. The fluctuation will also cause the circuit breaker to trip, and there may be a voltage fault in the process of reclosing after the leakage fault is restored, or a voltage fault in the process of reclosing after the voltage fault is restored. This makes the reclosing circuit breaker without voltage detection function on the incoming line side risky one-time reclosing regardless of the current voltage of the line, which will bring hidden dangers to the safety of lower-level equipment

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