电力系统短路电流直流分量及其对断路器开断能力的影响  

Analysis on DC Component in Short-Circuit Current of Power Grid and Its Influence on Breaking Ability of Circuit Breakers

作　　者：曹炜[1] 王永生[1] 张文青[1] 杨秀[1] 靳希[1] 刘蓓[2] 

机构地区：[1]上海电力学院电力与自动化工程学院,上海市杨浦区200090 [2]上海市电力公司,上海市浦东区200122

出　　处：《电网技术》2012年第3期283-288,共6页Power System Technology

基　　金：国家电网公司科技项目(08310531111696)~~

摘　　要：短路电流中的周期分量和直流分量对系统短路容量都有贡献,而后者在工程应用中没有引起足够的重视。从仿真计算和实际故障录波2方面介绍了超高压输电网中短路电流直流分量的衰减情况,定量估计了直流分量对运行中的断路器开断能力的影响。最后,对运行中的断路器的开断能力和关合能力做出了综合评价,并得出结论:如果按短路电流周期分量校核断路器开断能力,则需要留有10%～30%的裕度,以考虑开断电流中可能存在的直流分量;限制运行中的断路器使用的仍是其开断能力而不是其关合能力。There are two main components in short-circuit current of power system, i.e., the periodical component and direct current （DC） component, however in engineering application there is no special attention paid to the latter. The attenuation of DC component of short-circuit current in EHV power transmission network is presented in two aspects, namely simulation and actual recorded fault data, and the influence of DC component on breaking ability of circuit breakers being operated. Finally, the breaking ability and making capability of circuit breakers being operated are synthetically evaluated, and following conclusion are obtained： if the breaking ability of circuit breaker is checked by periodical component in short-circuit current, it is necessary to keep out the margin of breaking ability in the range from 10% to 30% to take possibly existing DC component in the fault current to be switched off; as for the circuit breaker being operated in limited operation mode, the breaking ability of circuit breaker to be considered is its rated breaking capacity, but not the making capability.

关 键 词：短路电流 断路器 开断能力 直流分量 故障录波 

分 类 号：TM134[电气工程—电工理论与新技术]