作者：袁燕岭1, 李凯特2, 董杰1, 高俊福1, 李世松2, 赵伟2
作者单位：1. 国网唐山供电公司, 河北 唐山 063000;
2. 清华大学电机工程与应用电子技术系 电力系统及发电设备控制和仿真国家重点实验室, 北京 100084
关键词：电力电缆;电流测量;偏心误差;旋转法;电磁场有限元仿真
摘要：
用磁传感器测量三芯电力电缆各芯线的电流时，磁传感器阵列的中心可能偏离电缆中心，致使测量结果中含有由此产生的误差即偏心误差，为此提出一种对偏心误差的计算和补偿方法。在原有测量方法基础上，将磁传感器阵列沿电缆轴向安装表面旋转180°，测量新位置上的磁感应强度。通过求解非线性方程组，可以确定偏心误差的大小；并据此对测量结果进行补偿，可得到计及偏心误差情况下三芯电力电缆各芯线电流值的实际大小。电磁场有限元仿真试验结果表明，所建立的解析模型具有很好的准确性，验证所提出计算和补偿方法的有效性。
Calculation and compensation method for eccentric error of current measurement of each core wire of three-core power cable
YUAN Yanling1, LI Kaite2, DONG Jie1, GAO Junfu1, LI Shisong2, ZHAO Wei2
1. Tangshan Power Supply Company, Tangshan 063000, China;
2. State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Abstract: When magnetic sensors are used to measure the current of each core of a three-core power cable, the center of the magnetic sensor array may deviate from the center of the cable, resulting in errors in the measurement results, i.e., eccentric error. For this reason, a method for calculating and compensating the eccentric error is proposed. Based on the original measurement method, the magnetic sensor array is rotated 180° along the axial installation surface of the cable, and the magnetic flux density at the new position is measured. By solving the nonlinear equations, the value of eccentric error can be determined. Based on this, the measurement results can be compensated, and the actual value of the current of each core of the three-core power cable under the condition of eccentric error can be obtained. The results of electromagnetic field finite element simulation test show that the analytical model established has good accuracy, which verifies the effectiveness of the proposed calculation and compensation method.
Keywords: power cable;current measurement;eccentric error;rotation method;electromagnetic field finite element simulation
2019, 45(1):19-26 收稿日期: 2018-05-09;收到修改稿日期: 2018-07-12
基金项目:
作者简介: 袁燕岭(1982-),男,河北邯郸市人,高级工程师,硕士,主要从事电力系统研究
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