摘要
提出一种利用空间磁场感应获取小电流接地故障暂态及稳态电流信息的新方法。详细分析了架空线路周围故障磁场的特征,阐述了线路下方零模电流的最佳检测点的计算方法,提出通过感应该点处的水平磁场可以获取零模电流信号。在偏离该点的线路正下方附近,通过感应水平磁场可以获取以零模分量为主导的故障电流信息,感应垂直磁场可以获取以线模分量为主导的故障电流信息,并提出利用圆柱形线圈感应空间磁场获取故障电流信息的方法。最后通过实例仿真及试验验证了该方法的可行性。
A new approach using the magnetic field induction is presented to measure transient and steady-state fault currents in non-solidly earthed overhead lines. The paper analyses the characteristics of fault magnetic field around the overhead lines, and the best measurement point for the zero module component of fault current. The zero module current can be measured by inducting the horizontal component of magnetic field. For others off the best point under the overhead lines, the zero module dominated fault current can be measured by the horizontal magnetic field, and the aerial module dominated fault current by the vertical component of magnetic field. The paper proposes to use a cylindrical coil to induct the magnetic field for fault current measurements. Simulation and experimental results demonstrate the feasibility of the method.
出处
《电力系统自动化》
EI
CSCD
北大核心
2008年第9期74-78,共5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
小电流接地
电流测量
磁场
架空线路
single-phase earth fault
fault current measurement
magnetic field
overhead line
