摘要
数字通道的不对称时延对线路电流差动保护具有不利的影响,其影响机理复杂、后果严重,有必要采用有效的方法对其进行分析,以提高继电保护的可靠性。首先,分析了线路电流差动的工作原理和动作判据;然后,针对不对称时延对继电保护可靠性的影响,确定了不同故障条件下的量化分析方法;最后,通过实例验证了该方法的可行性和正确性。研究结果表明,不对称时延对继电保护可靠性的影响与故障条件有显著相关性,这一结论对继电保护可靠性评估和通道优化具有工程参考价值。
The asymmetric delay of digital channels has negative effects on line current differential protection in a complex mechanism.Hence,it's necessary to use effective methods to improve the reliability of relay protection. Firstly,the operation principle and criterion of line current differential protection were analyzed.Then,the 'influence of asymmetric delay on the reliability of relay protection was analyzed,and the quantitative analysis method of the influence under different fault conditions was determined.Finally,the feasibility and correctness of the method were verified.The results show that effects of asymmetric delay on reliability of relay protection have a significant correlation with fault conditions.This conclusion has practical value in reliability evaluation and channel optimization of relay protection.
作者
高会生
沈青
GAO Huisheng;SHEN Qing(Department of Electronic and Communication Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电信科学》
2019年第1期90-96,共7页
Telecommunications Science
基金
国家电网公司科技项目(No.xx71-16-004)~~
关键词
线路电流差动保护
继电保护通道
不对称时延
继电保护可靠性
仿真分析
line current differential protection
relay protection channel
asymmetric delay
reliability of relay protection
simulation analysis
