摘要
针对如何准确判断电力系统短路故障以提高电力系统继电保护运行的可靠性、灵敏性,提出了一种利用短路电流中的非周期分量作为短路故障判据的方法:利用Matlab仿真提取短路电流的非周期分量,依据非周期分量的特点将其应用于继电保护.运行结果表明,非周期分量方向纵差保护不受线路对地电容的影响,无论单独作为主保护,或与其他保护相结合,都能准确判断电力系统短路故障,但非周期分量是一个暂态量,存在时间较短的缺点,在运用中需要使用信号保持器.
Aiming at how to accurately determine the short circuit fault in power system in order to improve the reliability and sensitivity of the relay protection of power system,a method which used short-circuit cur-rent in a non-periodic component as a criterion in short-circuit fault was proposed. Using Matlab to extract short-circuit current of the non-periodic component,was then applied the features of the non-periodic com-ponent in the short circuit current to the relay protection of power system. The test run results showed that the directional differential protection of non-periodic components was not affected by the influence of line to ground capacitance. Either as a sole major protection,or as a part of the combined protections,it can always accurately identify the short fault of electric system. However,non-periodic components are transient signals with short existence,therefore a signal maintainer is needed during operation.
出处
《郑州轻工业学院学报（自然科学版）》
CAS
2015年第2期88-92,共5页
Journal of Zhengzhou University of Light Industry:Natural Science
关键词
短路电流
非周期分量
光电流互感器
继电保护
MATLAB
仿真
short-circuit current
non-periodic components
optical current transducer
relay protection
Matlab simulation
