摘要
变压器中性点直流偏磁电流的准确测量是开展电网直流偏磁监测、防御和治理的重要理论基础。针对变压器中性点多扁钢入地条件下,传统的扁钢采样电阻直流偏磁电流测量方法存在的问题,在不增加电流源的前提下,采用多扁钢等电阻同时采样的测量回路,提出了一种可准确测量多根扁钢流经直流偏磁电流的方法,分析了该方法中多扁钢采样阻值偏差对测量准确度的影响,并通过真形扁钢试验,验证了该方法的可行性。该方法可用于直流偏磁电流的在线监测和带电检测,具有较好的实用推广价值。
The accurate measurement of the DC bias current at the neutral point of transformer is an important theoretical basis for the monitoring,protection and management of the DC biased magnetic current in power grid.Aiming at the problems existing in the traditional method for measuring DC bias current of flat steel bars’ sampling resistors under the condition of transformer’s neutral point with multiple flat steel bars grounded,this paper proposes a method to accurately measure the DC biased magnetic current flowing through multiple flat steel bars by using a measurement circuit simultaneously sampling resistors of multiple flat steel bars and others,without increasing the current source. And then,the paper analyzes the influence of sampling resistance deviation on measuring accuracy,and finally verifies the feasibility of the method by test with real steel bars. The proposed method can be used for on-line monitoring and live detection of DC biased magnetic current,and also has a good practical and popularization value.
作者
李晓辉
黄霍
吴传奇
阮羚
陈隽
陈理
李红兵
李小双
高廷辉
周娱
LI Xiaohui;HUANG Huo;WU Chuanqi;RUAN Lin;CHEN Jun;CHEN Li;LI Hongbin;LI Xiaoshuang;GAO Tinghui;ZHOU Yu(Electric Power Research Institute,State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430077,China;Xianning Power Supply Company,State Grid Hubei Electric Power Co.,Ltd.,Xianning Hubei 437000,China;State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430077,China;Wuhan Xindian Electrical Co.,Ltd.,Wuhan Hubei 430077,China)
出处
《湖北电力》
2021年第5期1-5,共5页
Hubei Electric Power
基金
国网湖北省电力有限公司科技项目(项目编号:SGHB DK00SNKS2100221)。
关键词
直流偏磁
变压器中性点
直流电流测量
电阻取样
在线监测
DC magnetic bias
transformer neutral point
DC current measurement
resistance sampling
online monitoring
