作者：袁燕岭1, 李世松2, 董杰1, 甘景福1, 黄松岭2, 赵伟2
作者单位：1. 国网唐山供电公司, 河北 唐山 063000;
2. 清华大学电机系, 北京 100084
关键词：电力电缆;电流测量;在线监测;磁传感器
摘要：
三芯对称电力电缆的三相芯线互呈120角分布，因结构紧凑、敷设成本低，被广泛应用于35 kV以下电缆输配电工程中。三芯对称电力电缆使用共同的屏蔽层和外壳，由于在稳态运行时三相电流之和为0，因而传统的感应式电流测量方法无法用于该类型电力电缆相电流的测量。为解决该问题，提出一种基于磁传感器的三芯对称电力电缆相电流测量方法。通过在三芯对称电力电缆表面沿周向互差120地安装3个与各相芯线准直的磁传感器，可线性地感知三芯对称电力电缆各相芯线的电流。通过建立物理数学模型，明确磁传感器输出量与三芯对称电力电缆各相芯线电流之间的量值关系。数值仿真计算验证所建立模型以及所提出测量方法准确实用。
Measuring method for phase current of symmetrical three-core power cable based on magnetic sensors
YUAN Yanling1, LI Shisong2, DONG Jie1, GAN Jingfu1, HUANG Songling2, ZHAO Wei2
1. Tangshan Electrical Power Company, Tangshan 063000, China;
2. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Abstract: The symmetrical three-core cable has three phase cores with every 120 degrees, which, based on its simple construction and low cost, has been widely used in the electrical energy transmission project below 35kV. A symmetrical three-core cable uses a common shield and shell. Since the total current of three phases is zero in steady state, and hence the traditional inductive current measurement method cannot be employed to measure the phase current. In order to overcome this shortcoming of the existing measurement technique, this paper presents a new method for the phase current measurement of a symmetrical three-core power cable based on magnetic sensors. In the approach, three magnetic sensors, aligned to the three phase cores of the cable, are installed on the power cable surface, yielding a linear response of the phase current. By developing a physical model, the relationship between the sensor output and the phase current is defined. The model has been verified by finite element simulations.
Keywords: electrical power cable;current measurement;online monitoring;magnetic sensor
2016, 42(8): 29-32,72 收稿日期: 2016-2-23;收到修改稿日期: 2016-4-18
基金项目:
作者简介: 袁燕岭(1982-),男,高级工程师,主要从事电力设备运维检修技术及应用方法研究。
参考文献
[1] 韩立奎,王海涛,韩晓冰. 电缆设计中三芯与单芯电缆的选择与比较[J]. 电线电缆,2011,5(5):15-16.
[2] 袁燕岭,李世松,董杰,等. 电力电缆诊断检测技术综述[J].电测与仪表,2016(9):1-7.
[3] 彭超,赵健康,苗付贵. 分布式光纤测温技术在线监测电缆温度[J]. 高电压技术,2006,32(8):43-45.
[4] 刘刚,张高言,周凡. 基于等温松驰法的110 kV高压电缆老化状况评估[J]. 高电压技术,2014,40(2):497-504.
[5] 郭灿新,张丽,钱勇,等. XLPE电力电缆中局部放电检测及定位技术的研究现状[J]. 高压电器,2009,45(3):56-60.
[6] 王福忠,董鹏飞,董秋生,等. 煤矿6 kV动力电缆绝缘在线监测系统研究[J]. 电子测量与仪器学报,2015,29(9):1398-1405.
[7] 周远翔,赵健康,刘睿,等. 高压/超高压电力电缆关键技术分析及展望[J]. 高电压技术,2014,40(9):2593-2612.
[8] 杨春宇. 电力电缆故障分析与诊断技术的研究[D]. 大连:大连理工大学,2013.
[9] 辛守乔,邱清泉,张国民,等. 线性双极巨磁阻传感器输出特性的测试研究[J]. 高电压技术,2009,35(10):2452-2457.
[10] YONG O Y, HE J L, HU J, et al. A current sensor based on the giant magnetoresistance effect: Design and potential smart grid applications[J]. Sensors,2012,12(11):15520-15541.
