断路器本体三相不一致保护回路优化的研究

摘要

At present,the three-phase inconsistent pro-tection of the circuit breakers for the 220 kV and above voltage power grids in Fujian mainly uses the body three-phase incon-sistent protection circuit. In the actual operation,the three-phase inconsistent protection may malfunction due to damages, interference,strong magnetic field and other factors to prevent the damage on the export relay,interference,strong magnetic field and other factors,this paper analyzes the working principle of the circuit breaker body three-phase inconsistent protection, and puts forward the optimization schemes of the secondary circuit. The related on-site test has verified rationality and reliability of the optimized scheme.%目前福建220 kV及以上电压等级电网断路器三相不一致保护普遍采用本体三相不一致保护回路的实现方式。现场运行中，由于三相不一致出口继电器损坏、干扰、强磁场及人为等因素导致断路器三相不一致保护误动作，对电网安全稳定运行造成一定影响。详细分析了断路器本体三相不一致保护的工作原理，并在此基础上提出了二次回路优化方案，通过现场相关试验，验证了优化方案的合理性和可靠性。