利用暂态幅值故障测度的谐振电网故障选线  

A fault feeder selection method for resonant grounding system based on transient amplitude fault measure

作　　者：闫光太 梁甲文 王新涛 刘安华 

机构地区：[1]聊城供电公司,山东聊城252000

出　　处：《电力系统保护与控制》2015年第8期64-68,共5页Power System Protection and Control

摘　　要：为了准确检测出谐振电网单相接地故障,提出一种基于暂态幅值故障测度的故障选线方法。通过模量变换,分析发生故障后的故障馈线和正常馈线,利用电流的小波模极大值特性得出零模初始电流小波模极大值的规律。结合此规律和一般故障测度的定义,定义了暂态幅值故障测度。故障馈线的暂态幅值故障测度最大,正常馈线的暂态幅值故障测度大于0且接近于0,据此检测出故障馈线。理论分析和ATP仿真结果表明,该方法能有效准确地检测出谐振电网单相接地故障,不受消弧线圈的影响,证明了该方法的正确性。In order to accurately detect single-phase ground fault in resonant grounding systems,a fault line selection method based on fault transient amplitude measure is proposed.With the modulus transform,feeder fault and normal feeder after fault are analyzed.By using wavelet modulus maxima characteristic current,the law of zero mode initial current wavelet modulus maxima is developed.The transient amplitude fault measures are defined combined with this law and the general fault measures.The transient amplitude fault measure of the fault feeder is maximum,and the normal ones is greater than 0 and close to 0.Accordingly,the fault line selection method is proposed and the fault feeder is detected.Theoretical analysis and ATP simulation results show that,this method can effectively detect single-phase ground fault in resonant grounding systems,and is not influenced by arc suppression coil.

关 键 词：谐振电网 单相接地故障 零模初始电流 暂态幅值故障测度 ATP仿真 

分 类 号：TM73[电气工程—电力系统及自动化] TM862