直流断路器用于锂电池组保护的选择性配合

Protection Selectivity of DC Circuit Breaker for Lithium-ion Batteries

保护电器选择性配合在直流电源系统中的应用一直是电力工程重要的研究课题,尤其近年来磷酸铁锂电池的应用越来越多,磷酸铁锂电池由于内阻小,短路电流大,直流小型断路器(MCB)在此种情况下的选择性更为重要。通过对高瞬动保护型直流MCB、高精度型直流MCB在工程案例中应用的计算和试验验证,提供了发电厂、变电站直流电源系统中MCB的选择方法,为直流电源系统中应用锂电池时,正确选用直流MCB提供参考。

Application of selective protection in the DC power supply system has always been an important research topic in the electric power engineering. Especially in recent years there is more and more application of lithium iron phosphate batteries,for lithium iron phosphate batteries due to small internal resistance and large shortcircuit current,selectivity of DC miniature circuit breakers in such a case is more important. This article,through the calculation and experiment of to the high transient dynamic protection type DC miniature circuit breaker（ MCB）,high-precision DC MCB in the case of the engineering application,provides MCB selection method in a power plant and substation DC power supply system,and provides the reference for the lithium battery in the DC power supply system correctly choose DC miniature circuit breaker.