小相角故障行波测距方法研究 

韩志锟

江苏省电力设计院，江苏 南京 211102 
 

摘 要：为滤除环境干扰，提取输电线路小相角故障时的微弱行波信号，实现准确故障测距，提出了能量比法。从行波能量角度出发，选择合理时间窗，并利用时窗滚动处理故障行波进行能量比计算，得到信号波头时延以实现故障测距。仿真结果表明，该方法在低信噪比环境下有较强抗干扰能力，对微弱突变有效信号也十分敏感，可广泛应用于行波故障测距领域。
关键词：能量比；小相角故障；行波故障测距；时间窗；干扰
中图分类号：TM711；TM744 文献标识码：A 文章编号：1007-3175(2013)04-0028-05

Research of Traveling Wave Fault Location Method Under Small Phase-Angle 

HAN Zhi-kun

Jiangsu Electric Power Design Institute, Nanjing 211102, China 
 

Abstract: In order to filter noises, to collect weak traveling wave signals when small phase-angle failure occurred and to implement accurate fault location, this paper utilized an energy ratio method. From the viewpoint of traveling wave energy, rational time window was chosen to continuously process fault traveling wave to carry out the calculation of energy ratio, thus the time-delay of wave front could be calculated and fault location was implemented. Simulation results show that this method has stronger anti-interference ability in the environment with low S/N ratio, accurately identifying weak variation signals. This method has the practical value for traveling wave fault location. 
Key words: energy ratio; small phase-angle fault; travelling wave fault location; time window; noise

参考文献
[1] 郭宁明，覃剑，陈祥训.基于信号相位检测的输电线路行波故障测距方法[J].电网技术，2009，33(3)：20-24．
[2] 陈祥训.实小波变换提取相位信息方法研究[J].中国电机工程学报，2007，27(22)：8-13．
[3] 卢毅，姜玉磊，杨静.能量比函数法估算局部放电时延迟[J]．高电压技术，2007，33(5)：87-89．
[4] 秦槐，黄福珍，陈辰.基于S变换的高压直流输电故障诊断[J].华东电力，2012，40(4)：599-603．
[5] 黄雄，王志华，尹项根，等.高压输电线路行波测距的行波波速确定方法[J].电网技术，2004，28(19)：34-37．
[6] 王昌长，李福琪，高胜友.电力设备的在线监测与故障诊断[M].北京：清华大学出版社，2006．
[7] 卢毅，杨静.GIS在线检测中局部放电和外部干扰信号的识别[J].电力系统自动化设备，2007，27(6)：71-73．
[8] 卢毅，韩志锟，陈瑜.基于能量比预处理的FFT窄带滤波方法[J].东南大学学报：自然科学版，2010，40(5)：948-951．