阶跃响应法在小电流接地系统故障选线与测距中的应用  

Application of step response method in fault detection and location for neutral ineffectively earthed distribution systems

作　　者：肖锋[1] 李欣然[1] 石吉银[2] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]福建省电力试验研究院,福建福州350007

出　　处：《电力科学与技术学报》2008年第1期83-88,共6页Journal of Electric Power Science And Technology

基　　金：高等学校博士学科点专项科研基金(20070532052)

摘　　要：小电流接地系统发生单相接地后,分析对外施阶跃激励,所有线路在某一特定频率下幅值达到最大,故障线路幅频响应最大值等于所有非故障线路幅频响应最大值之和,相位相反;且幅频特性峰值及其对应频率与故障位置存在严格的解析映射关系,据此构造了基于注入信号的小电流接地系统单相接地故障选线和测距的"阶跃响应法".仿真实验表明,该方法受过渡电阻影响很小,能够实现准确选线和精确定位.After the single-phase grounding fault occurs in neutral ineffectively earthed distribution systems, frequency spectrum characteristics of transient response caused by the step source are analyzed. All lines have the biggest amplitude peak value at some special frequency point, and the amplitude-frequency response maximum of the faulted line is the sum of all the sound lines＇, and their phases are reverse. Amplitude-frequency characteristic peak value and its corresponding frequency have relations with the fault distance. The step response method for slngle-phase grounding fault line detection and fault point location is thus proposed. ATP simulation results show that the method has perfect performance with little influenced by grounding fault resistance.

关 键 词：小电流接地系统 阶跃响应 频谱特性 故障选线 故障测距 

分 类 号：TM773[电气工程—电力系统及自动化] TM711