赵金剑(悉地国际设计顾问(深圳)有限公司,广东省深圳市 518057)
接地故障环路阻抗在故障防护中的重要意义(赵金剑)
The Significance of Earth Fault Loop Impedance for Fault Protection
ZHAO Jinjian(CCDI Group(Shenzhen)Co.,Ltd.,Shenzhen 518057,Guangdong Province,China)
Abstract:The significance of earth fault loop impedance for fault protection is pointed out,the calculation and application method of maximum earth fault loop impedance are given,and the solutions for abnormally high earth fault loop impedance are proposed.
Key words:earth fault;maximum earth fault loop impedance;circuit breaker;fuse;residual current device;maximum allowable conductor length;instantaneous action current setting;equipotential bonding of supplementary protection
摘 要:指出接地故障环路阻抗在故障防护中的意义,并给出最大接地故障环路阻抗的计算及应用方法,对接地故障环路阻抗异常高的情况提出解决方案建议。
关键词:接地故障;最大接地故障环路阻抗;断路器;熔断器;剩余电流动作保护器;导体最大允许长度;瞬时动作电流整定;辅助保护等电位联结
中图分类号:TU852 文献标识码:A
doi:10.3969 / j. issn.1003 - 8493.2020.010.007