标题：A new method for current measurement of overhead lines
作者：Li, JianSheng ;Liang, Jun
作者机构：[Li, JianSheng ;Liang, Jun ] ShanDong University, Jinan 250061, China
会议名称：2011 International Conference on Advanced Power System Automation and Protection, APAP 2011
会议日期：16 October 2011 through 20 October 2011
来源：APAP 2011 - Proceedings: 2011 International Conference on Advanced Power System Automation and Protection
关键词：current measurement; horizontal magnetic field; Maxwell simulation; non-contact sensors
摘要：With the rise of the power transmission capacity and the voltage classes, traditional current transformers begin to reveal more and more problems. In view of this, a novel approach is presented in this paper to measure line currents by using the magnetic field under overhead lines. The characteristics of the magnetic field around overhead lines are analyzed in detail, a method for measuring horizontal magnetic field is proposed, and the formulas for calculating three-phase line currents are deduced according to the horizontal magnetic field at three different places under overhead lines. Finally the magnetic fields under transmission lines are simulated both in steady and lighting states with Maxwell software and the line currents are calculated by adopting the proposed method. The feasibility of the proposed method is verified through comparison between the calculated value and the simulation value. © 2011 IEEE.