An intelligent reclosing circuit breaker and its automatic reclosing control method

Abstract

An intelligent reclosing circuit breaker, including an operating mechanism, a current and leakage detection module and a power module, a voltage detection module connected to the incoming line side of the main circuit and the rear end of the slave contact device, an electric reclosing mechanism, a control unit and its A signal interaction module that connects and interacts with signal data. According to the automatic reclosing control method, the user can set which voltage faults need to trip and which instantaneous voltage faults allow automatic reclosing through the signal interaction module. The control unit is based on the current signal, voltage signal and signal interaction module input by each detection module. The preset threshold parameters automatically judge and control whether the operating mechanism performs tripping. After a trip caused by an instantaneous voltage or current fault, the control unit automatically judges and confirms whether the fault is allowed to recover according to the voltage signal collected by the voltage detection module after the circuit breaker trips and the threshold parameter preset by the signal interaction module, and controls the electric reclosing Whether the brake mechanism implements electric reclosing.

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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