变电站继电保护间歇性弧光接地故障识别方法  

Identification Method for Intermittent Arc Grounding Faults in Substation Protective Relays

作　　者：何其川 HE Qichuan(Nanjing Nanrui Jibao Electric Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211106

出　　处：《电工技术》2024年第9期1-3,6,共4页Electric Engineering

摘　　要：传统的间歇性弧光接地故障识别方法主要基于电气量进行故障识别,容易受到系统运行状态、负荷变化等干扰信号的影响,导致故障识别精度低等问题。为解决以上问题,首先需进行接地故障特征分析,然后基于故障特征提取间歇性弧光接地故障信号暂态量,通过包含弧光接地信息的暂态量进行弧光接地故障区段的定位,确定故障位置后即可根据暂态能量变化判别接地故障,实现对间歇性弧光接地故障的识别。试验结果表明:与小波变换法和傅里叶变换法相比,变电站继电保护间歇性弧光接地故障识别方法能识别故障发生的精确位置和持续时间,且识别精度更高,具有较高的实际应用价值。Traditional intermittent arc grounding fault identification methods mainly utilize electrical quantities for analysis,which are easily affected by interference signals such as system operation status and load changes,leading to low accuracy in fault identification.To solve the above problems,it is necessary to first analyze the characteristics of grounding faults,extract transient quantities of intermittent arc grounding fault signals based on fault characteristics,locate the arc grounding fault section through transient quantities containing arc grounding information,determine the fault location,and then judge the grounding fault according to transient energy changes,achieving fault identification of intermittent arc grounding.The experimental results show that compared with wavelet transform and Fourier transform methods,the identification method for intermittent arc grounding faults in substation protective relays studied in this work can accurately identify the location and duration of faults with higher recognition accuracy,and is hence of high applicative value.

关 键 词：变电站 继电保护 间歇性 弧光接地 故障区段 识别方法 

分 类 号：TP183[自动化与计算机技术—控制理论与控制工程]