摘要
近年来,非侵入式电压测量因具备安全性高、便于安装和维护等优势而受到国内外电力工作者们的青睐,但以电场为中间量反演电压的过程中,电场存在串扰问题。为此,对一种新的电场反演方法进行电场耦合误差分析。首先,通过探究10 kV架空线路空间电场分布情况,提出近端电场积分方法;其次,利用三相电场耦合计算模型,对10 kV架空线路三相电场之间的串扰进行误差分析;最后,通过Comsol有限元软件搭建10 kV三相输电线路仿真模型,获取其电场分布并进行验证。结果表明:三相导体下方电场强度均主要来自待测相,传感器距离待测导体0.03 m、0.05 m和0.07 m时,其他相的耦合分量非常小,其占比小于1.5%,基本可忽略不计。仿真结果与理论计算结果相一致,两者之间的误差控制在0.2%以下,因此,通过调整传感器的安装部署位置,近端电场积分法对不同电压等级均有适用性。本文的研究成果可为非侵入式电压在线监测装置的研发提供理论指导。
In recent years,non-invasive voltage measurement has become popular in the power sector at home and abroad because of its safety,installation and maintenance convenience.However,crosstalk challenges arise when utilizing the electric field as the intermediary for voltage inversion.To address this,this paper investigates the electric field coupling error of a new electric field inversion approach.Firstly,the near-end electric field integral method is proposed by exploring the spatial distribution of the electric field in 10 kV overhead lines.Secondly,the three-phase electric field coupling computational model analyzes crosstalk errors amongst the 10 kV overhead line’s three-phase electric fields.Finally,a simulation model of a 10 kV three-phase transmission line is constructed using Comsol Finite Element Software to acquire its electric field distribution,followed by validation.The results show that the primary electric field strength under the three-phase conductors mainly comes from the phase under scrutiny,the sensor is 0.03,0.05,0.07 m far from the condultor to be measured.and interference from other phases is minimal,accounting for less than 1.5%.Simulation results are consistent with theoretical estimates,with discrepancies under 0.2%.By tweaking the sensor′s placements,the near-end electric field integral technique is applicable to different voltage levels.This study′s insights provide a theoretical foundation for developing non-invasive online voltage monitors.
作者
孙尚鹏
马飞越
柯锟
陈磊
白涛
杨庆
SUN Shangpeng;MA Feiyue;KE Kun;CHEN Lei;BAI Tao;YANG Qing(Electric Power Research Institute of Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China;National Key Lab of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China;Shizuishan Power Supply Company of State Grid Ningxia Electric Power Co.,Ltd.,Shizuishan Ningxia 753000,China)
出处
《宁夏电力》
2023年第5期32-38,共7页
Ningxia Electric Power
基金
国网宁夏电力有限公司科技项目(5229DK230005)。
关键词
非侵入测量
近端电场积分
耦合误差
三相输电线路
non-invasive measurement
near-end electric field integration
coupling error
three-phase transmission line
