摘要
分析了现有的多种单相接地故障选线方法,研究基于暂态量的选线方法的灵敏度在CT采样过程中的影响。小电流接地系统的故障暂态信号很有可能被噪声信号覆盖或相互混淆,影响选线的正确性,本文提出在电压形成回路之前加入带通滤波器,利用滤波器除去对选线结果没有影响的工频信号,通过合理选取电流变送器的变比将故障暂态量放大,在保证暂态量的完整性和正确性的同时,提高了选线的可靠性。仿真计算结果表明,该方法可行且适用于实际应用。
By analyzing the existing single-phase ground fault line selection methods,this paper studies influence on CT sampling process caused by the sensitivity of line detection methods which are based on transient components.The transient signal after fault in small current neutral grounding system is probably to be inundated with noise signal,thereby affecting the correctness of fault line detection.This article proposes the introduction of band-pass filter to eliminate the 50 Hz signal which begets no impact on line detection,then amplifies the transient component by regulating the transformation ratio of current transmitter,hence this method can ensure the completeness and correctness of transient signals,and enhance the reliability of fault line detection.Simulated results denote that the proposed method is viable in engineering practicality.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2014年第6期65-69,80,共6页
Proceedings of the CSU-EPSA
关键词
配电网
单相接地故障
故障选线
选线灵敏度
distribution network
single phase earth fault
fault line detection
sensitivity of line-selection
