一种新方法在监视线保护中的应用  

Application of a new method in the cable monitor wire protection

作　　者：陈奎[1] 孙常青[1] 张丽[1] 唐轶[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电力系统保护与控制》2010年第6期76-79,83,共5页Power System Protection and Control

摘　　要：分析了现有煤矿高压防爆开关中监视线保护方法受到杂散干扰信号的影响而容易产生误动和拒动的原因。推导了能实现滤除衰减直流分量的改进全波傅氏算法,在此基础上提出了终端加电阻的分时变幅交流监视线保护原理,并对其进行了详细证明。经理论分析、实验和运行证明,该方法可以很好地滤除直流、衰减直流信号以及分频、工频和高频杂散电流;尤其对与附加交流频率相同的干扰信号能完全地滤除。所提方法为提高监视线保护的准确性提供了新思路。The reason that existing mine HV explosion-proof switches fail to operate or operate incorrectly which are influenced by stray interference signal is analyzed in this paper.Then improved Fourier algorithm which can realize filtering decaying DC component is derived.It puts forward time-sharing amplitude AC cable monitor wire protection principle with the terminal connected to a resistor based on this algorithm.It＇s proved by theoretical analysis,experiment and operation that this method is preferable to filter DC and decaying DC signal and stray current of frequency division,power frequency and high-frequency,especially can absolutely filter interference signal of the same frequency with additional AC.This method supplies new thoughts to improve the precision of monitor wire protection.

关 键 词：监视线保护 干扰信号 分时变幅 衰减直流分量 

分 类 号：TD611.5[矿业工程—矿山机电]