摘要
提出一种利用暂态电磁场信号实现架空线路小电流接地故障定位的新方法。详细分析了线路下方不同方向电磁场的特征,提出利用特征频段内垂直电场的Hilbert变换与水平磁场的乘积计算故障方向,根据故障点前后故障方向的不同确定故障区段。阐述了所述方法的若干性能与抗干扰措施,最后通过仿真和试验验证了该方法的正确性。
A new approach using transient electromagnetic field signal for earth fault locating in non-solidly earthed overhead lines is presented.The characteristics of electromagnetic field in different directions under lines are analyzed in detail.Also,the product of vertical electric field after Hilbert transformation and horizontal magnetic field in SFB is determined the direction of the fault.The earth fault can be located in accordance with the difference of fault directions before and after fault.Some performance of the proposed method and the anti-interference measures adopted are introduced. Finally, experiment and simulation results verify the feasibility of this approach.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第19期71-76,共6页
Automation of Electric Power Systems
基金
山东省自然科学基金资助项目(Z2006F05)~~
关键词
架空线路
小电流接地故障
故障定位
电场
磁场
HILBERT变换
overhead line
non-solidly earthed fault
fault locating
electric field
magnetic field
Hilbert transform
