Circuit breakers and disconnecting systems with neutral and phase disconnection detection

Abstract

The invention discloses a circuit breaker with a zero line and phase line breaking detection function. The circuit breaker comprises a circuit element. The circuit element comprises three phase line incoming terminals, three phase line outgoing terminals, a zero line incoming terminal, a zero line outgoing terminal, four current converters, three voltage converters, a data processing unit, a switching output circuit and a circuit breaker. Three phase line incoming terminals and three phase line outgoing terminals are connected through the circuit breaker. A current converter is connected in series between each phase line incoming terminal and each phase line outgoing terminal. A current converter is connected in series between the zero line incoming terminal and the zero line outgoing terminal. The output ends of three voltage converters and four current converters are connected with the data processing unit. The data processing unit is connected with the circuit breaker through the switching output circuit. The invention further discloses a circuit breaker system with the zero line and phase line breaking detection function. According to the invention, a zero line breaking and phase loss detection function is realized, and losses caused by zero line breaking and phase loss operation can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to a circuit breaker with the function of detecting the disconnection of the neutral wire and the phase wire and a circuit breaker with the function of detecting the disconnection of the neutral wire and the phase wire. Background technique [0002] The 400V low-voltage power distribution system generally adopts three-phase power supply. When the neutral line breaks, the neutral point potential will shift, the phase voltage of the heavy load will increase, and the phase voltage of the light load will decrease, resulting in the burning of the user's electrical appliances in a large area and causing great economic losses to the user; When the phase wire is broken, the non-broken phase current of the three-phase asynchronous motor will increase, causing the motor to burn out. Therefore, it is of great significance to be able to detect the disconnection of the...

AI Technical Summary

Problems solved by technology

[0003] At present, the low-voltage circuit breakers used do not have the detection function of neutral wire disconnection and phase wire disconnection. The proposed phase-zero voltage protection scheme needs to use the voltage of the neutral point of the transformer and the neutral wire terminal of the user end. Using this scheme requires additional protection lines, and this scheme may cause malfunction when the three-phase load is unbalanced.

Images