电网技术2012，Vol.36Issue(1)：258-264,7.
基于行波时频特征的单端故障测距方法
A Single Terminal Fault Location Method Based on Time-Frequency Characteristic of Traveling Wave
摘要
Abstract
accuracy of determination There are two main factors influencing the traveling wave fault location, namely the of traveling wave velocity and the demarcation of the time when the wavefront of fault traveling wave arrives. On the basis of considering the impact of frequency-varying feature of parameters of transmission line on propagation characteristic of traveling wave, a single-terminal fault location method based on the time-frequency characteristics of traveling wave is proposed： firstly, the time characteristic of traveling wave＇s wavefront is linked with its frequency characteristic by Lipschits exponent of traveling wave signal; then by use of least squares method the Lipschits exponent of the detected second wavefront of traveling wave is fitted; finally, according to fitting result, the frequency components of fault traveling wave and the time when it arrives are determined, thus the fault distance can be calculated. Simulation results of EMTDC show that using the proposed fault location method, the accuracy of fault location is evidently higher than that by traditional traveling wave fault location methods, a~d the locatio~ accuracy is not affected by fault distance, fault resistance, fault inception angle and fault type, besides, the proposed method can well adapt to both transposed and untransposed lines.关键词
时频特征/行波/故障测距/Lipschitz指数/小波变换Key words
time-frequency characteristics/traveling wave/fault location/Lipschitz exponent/wavelet transform分类
信息技术与安全科学引用本文复制引用
林圣,何正友,陈鉴,李小鹏,钱清泉..基于行波时频特征的单端故障测距方法[J].电网技术,2012,36(1):258-264,7.基金项目
国家自然科学基金项目 （）
中央高校基本科研业务专项资金资助项目（2010XSll）.ProjectSupportedbyN~ionalNaturalScienceFotmdationofChina （）
FundamentalResearchFundsfortheCentralUniversities（2010XSlll. （）
