浅析电磁式剩余电流动作断路器保磁能力的提升

Analysis on the Improvement of Magnetic Holding Capacity of Electromagnetic Residual Current Operated Circuit Breaker

在大短路电流情况下,电磁式剩余电流动作断路器载流体周围形成电磁场,对电磁脱扣器内的永磁体产生不可逆的磁化效应,造成断路器保护功能失效。阐述了断路器的工作原理,分析了永磁体不可逆磁化的原因,结合仿真分析提出从减小载流体的激励磁场、提升永磁体的抗磁化能力等方面提高在大电流冲击下的保磁能力,从而提高该类断路器的应用可靠性。

In the case of high short-circuit current,electromagnetic residual current operated circuit breakers form electromagnetic fields around the carrier fluid,causing irreversible magnetization effects on the permanent magnet inside the electromagnetic release,causing the circuit breaker’s protection function to fail.This article explains the working principle of circuit breakers,analyzes the reasons for irreversible magnetization of permanent magnets,and proposes to improve the magnetic retention ability under high current impact by reducing the excitation magnetic field of the carrier fluid and enhancing the anti magnetization ability of the permanent magnet through simulation analysis,thereby improving the application reliability of this type of circuit breaker.