摘要
依据DL/T 5044-2014规定的短路电流计算方法,结合直流断路器的动作特性,对常规发电厂直流电源系统存在的选择性问题进行了分析,提出了采用具有熔断器特性的直流断路器、具有短路短延时特性的三段式直流断路器和具有限流特性的二段式相结合的过电流选择性保护解决方案。该方案满足发电厂直流系统保护电器要求,是发电厂直流电源过电流保护系统的最佳选择。
According to the calculation method of short circuit current in DL/T 5044-2014,combined characteristics of DC circuit breaker,this paper analyzed the selective problem of DC power system in power plant,and proposed selective protection solution which contains DC circuit breaker with fuse characteristics and three stage DC circuit breaker with short time delay and two stage DC circuit breakers with current limiting characteristics.This solution meets the requirementsof the power plant DC system protection apparatus,it is the best choice for the high reliability requirements of DC power supply over current protection system.
出处
《河北电力技术》
2016年第5期37-41,共5页
Hebei Electric Power
关键词
直流电源系统
选择性保护
越级跳闸
三段式直流断路器
全程反时限
过电流保护
DC power system
selective protection
leapfrog trip
three stage DC circuit breaker
reverse time limit
over current protection
