Circuit breaker and circuit break system having zero-line disconnection and open-phase protection function

Abstract

The invention discloses a circuit breaker having a zero-line disconnection and open-phase protection function. The circuit breaker comprises a circuit element including a three-phase line inlet wiring terminal, a three-phase line outlet wiring terminal, a zero line inlet wiring terminal, a zero-line outlet wiring terminal, a circuit breaker, three capacitors, a zero-sequence differential voltage relay, a current transformer, a current relay, a zero-line disconnection logic judgment module, a zero line disconnection signal relay, three low-voltage relays, an open-phase logic judgment module and a phase failure signal relay. In addition, the invention also discloses a circuit break system having a zero-line-breaking and open-phase protection function. With the circuit breaker and the circuit break system, the zero-line-breaking and open-phase detection function is realized. With the tripping protection way, losses caused by zero-line disconnection and open-phase running can be effectively reduced; and thus the personal and property safety of users can be protected.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to a circuit breaker with zero-break and phase-loss protection and a circuit breaker with zero-break and phase-loss protection. Background technique [0002] Most low-voltage electrical equipment adopts three-phase power supply. When the zero line of the three-phase low-voltage power supply system is disconnected, the potential on the zero line at the user end will shift, causing a large area to burn down the user's electrical appliances, causing great economic losses to the user; phase loss is another low-voltage distribution Common accidents in grid operation, phase-lack operation has a greater impact on three-phase loads, and in severe cases, electrical equipment will be burned. Therefore, it is of great significance to protect the safety of personnel and the property of users to be able to detect the disconnection of the zero line and the lack of phase...

AI Technical Summary

Problems solved by technology

[0003] The currently used low-voltage system circuit breakers do not have zero-break and phase-loss detection functions, and the existing zero-break detection scheme using zero-ground voltage requires an additional protection line, and the protection line is protected when the three-phase load asymmetry is large. Misoperation

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