周荣伟(上海电器科学研究院,上海市 200063)
曲德刚(上海儒丞电气工程咨询有限公司,上海市 200061)
短路电流直流分量对断路器分断能力影响分析(周荣伟 曲德刚)
Effects Analysis of Short‑circuit DC Component on Circuit Breaker Breaking Capacity
ZHOU Rongwei(Shanghai Electrical Apparatus Research Institute,Shanghai 200063,China)
QU Degang(Shanghai Rucheng Electrical Engineering Consultant Firm,Shanghai 200061,China)
Abstract:The decrease in the power factor of the short‑circuit current leads to the increase in the time constant of DC component,which further pushes up the difficulty in breaking the short‑circuit current of the current‑limiting circuit breaker. Through technical analysis,an equivalent coefficient for short‑circuit current is proposed,so as to solve the problem in selecting the parameter for the breaking capacity of the circuit breaker under a low power factor.
Key words:short‑circuit current;DC component;
circuit breaker;breaking capacity;power factor;equivalent coefficient;parameter selection;correction coefficient
摘 要:短路电流功率因数的减小,增大了直流分量时间常数,由此增加了限流断路器的分断短路电流的难度。通过技术分析,提出短路电流的等效系数,从而解决小功率因数下断路器分断能力的参数选择问题。
关键词:短路电流;直流分量;断路器;分断能力;功率因数;等效系数;参数选择;修正系数
中图分类号:TU852 文献标识码:A
doi:10.3969 / j. issn.1003 - 8493.2020.12.002