摘要
单相接地是化工企业低压配电系统经常出现的一种事故,通过计算分析了变压器高压侧过流保护能否起到低压侧单相接地保护的作用,以及如何在低压总进线断路器及支线断路器中设置接地保护,论述了在每一用电回路中如何使用带接地保护的断路器实现快速切除单相接地电流,最后结合实际时机运用情况,给出应在低压总进线断路器和馈出干线断路器中取消单相接地保护,而在每一个负荷回路接地电流大于断路器瞬动电流时使用一般断路器的结论。
Single-phase ground is an accident that often occurs in low voltage distribution systems of chemical company, this paper analyzes whether the high voltage side of the transformer over current protection can play a role in the low voltage side ground fault protection by calculating, then analyzes how to set ground protection at the low voltage circuit breaker of the total line and the branch line, discusses how to achieve rapidly removal of single-phase ground current with useing ground fault protection in each electrical circuit breakers to. Finally, at low total incoming circuit breaker and feeder breakers cancel out the trunk ground fault protection, and the use of the circuit breaker when the general conclusion of each load circuit breaker ground current is greater than the instantaneous current.
出处
《电子测量技术》
2017年第5期68-70,75,共4页
Electronic Measurement Technology
关键词
断路器
单相接地保护
变压器
circuit breaker
single-phase ground fault protection
transformer
