一种输电线路弱故障识别方法

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摘要输电线路上的绝大多数故障都会引起较强烈的行波信号,很容易被保护装置检测到。但是,在某些情况下,或者由于解耦矩阵的限制,线路上的故障信号本身十分微弱。加之一些高频干扰信号的影响,导致可检测到的故障信号十分有限,利用行波的保护将不能准确捕捉到故障信号,从而导致保护的拒动。本文通过大量的仿真,分析了这类弱故障信号的行波特征,提出了用于识别此类故障的方法,Matlab/Simulink仿真验证了该方法的有效性与可行性。

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	王丰

关键词 ：输电线路, 行波, 故障检测, 电压过零点, 弱故障

Abstract：The majority of faults on the transmission line can cause intense travelling wave signals, which can be easily detected by the protection device. However, in some cases, or due to the restriction of the decoupling matrix, the fault signal on the line is very weak. Combined with the influence of some high-frequency signals, the fault signal that can be detected is very limited. The protection based on traveling wave will not capture the fault signal accurately, resulting in the miss operation. In this paper, through a large number of simulations, the traveling wave characteristics of such weak fault signals are analyzed, and the methods for identifying such faults have been put forward. The Matlab/Simulink simulation experiments verify the feasibility of the method.

Key words： transmission line traveling-wave fault detection voltage zero crossing weak fault

收稿日期: 2017-12-11 出版日期: 2018-06-19

作者简介: 王丰（1988-）,男,硕士研究生,主要研究方向为电力系统继电保护。

引用本文:

王丰. 一种输电线路弱故障识别方法[J]. 电气技术, 2018, 19(6): 42-45. Wang Feng. The method for detecting weak faults in transmission lines. Electrical Engineering, 2018, 19(6): 42-45.

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http://dqjs.cesmedia.cn/CN/Y2018/V19/I6/42