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.pdfVIP

36 3 Vol. 36 No. 3 2012 3 Power System Technology Mar. 2012 1000-3673201203-0283-06 TM 134 A 470·4034 1 1 1 1 1 2 1 200090 2 200122 Analysis on DC Component in Short-Circuit Current of Power Grid and Its Influence on Breaking Ability of Circuit Breakers 1 1 1 1 1 2 CAO Wei , WANG Yongsheng , ZHANG Wenqing , YANG Xiu , JIN Xi , LIU Bei (1. School of Electric Power and Automation Engineering, Shanghai University of Electric Power, Yangpu District, Shanghai 200090, China; 2. Shanghai Municipal Electric Power Company, Pudong District, Shanghai 200122, China) ABSTRACT: 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 0 power transmission network is presented in two aspects, namely simulation and actual recorded fault data, and the [1] 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 [2-4] synthetically evaluated, and following conclusion are obtained: if the breaking ability of circuit breaker is checked by