受端电网负荷动态特性与三相短路电流相关性分析  

Analysis on Relativity Between Load Dynamics and Three-phase Short-circuit Current of Receiving-end Power System

作　　者：曹炜[1] 王伟[2] 刘蓓[2] 王永生[1] 段开元[1] 丁北平[1] 

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

出　　处：《电力系统自动化》2011年第5期61-65,共5页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(08310531111696)~~

摘　　要：对某实际受端电力系统进行了机电暂态仿真,表明当受端系统联系紧密时,负荷动态特性对三相短路电流周期分量的初始有效值及其在50 ms内的衰减数值影响较大,对该电网某次三相短路故障录波数据的波形分解结果也支持上述观点。仿真还表明,由于三相短路电流存在衰减,传统的不考虑负荷动态特性时求出的短路电流周期分量初始有效值仍可用来检验断路器的开断能力,但不宜用来检验断路器的动稳定。Mechanic-electric simulation of a real receiving-end power system shows that the load dynamics have a significant impact on the symmetrical three-phase short-circuit current within 50 ms after short-circuit.This is supported by the fault-recording data of a power grid accident.The simulation data and the fault-recording data both indicate that the result from the traditional practical short-circuit calculation can be used to check the interrupting capacity of the circuit breaker,but can not be used to check the stress intensity of the circuit breaker.

关 键 词：短路电流 开断电流 冲击电流 动态负荷 故障录波 

分 类 号：TM713[电气工程—电力系统及自动化]