电流极与电压极的引线夹角对接地电阻测量精度的影响研究  

Research on the Influence of Lead Angle of the Current and Voltage Pole on Grounding Resistance Measurement Accuracy

作　　者：黄新波[1] 姬林垚 朱永灿[1] 田毅[2] 乔卫中 

机构地区：[1]西安工程大学电子信息学院,西安710048 [2]西安电子科技大学机电工程学院,西安710071

出　　处：《高压电器》2017年第5期14-21,共8页High Voltage Apparatus

基　　金：陕西省重点科技创新团队计划(2014KCT-16);陕西省协同创新计划项目(2014XT-07)~~

摘　　要：对接地电阻值进行准确测量,是衡量接地装置是否达到有关规定要求的必要措施,接地装置良好,可以有效地避免由于接地电阻值未达到设计要求而导致的电气事故。由于接地电阻测量装置引线间存在互感的作用,会对测量信号产生干扰,影响测量结果,文中基于此,首先分析了两平行线间互感的影响机理,推导出了由于互感影响而产生在线路上的附加电阻R;然后,由于互感的影响随着引线夹角的改变而变化,因此可以将互感的影响转换为不同夹角对测量结果的影响,通过数学运算计算出最优夹角值;最后,搭建实验平台,进行实验验证。结果表明:当电压极与电流极引线夹角接近30°时,测量误差达到最小,有利于接地电阻测试仪测量精度的分析与改进。笔者最后还简要分析了在非均匀土壤情况,接地电阻测量的处理方法。Grounding resistance measurement is a necessary means to check whether the grounding device can meet the requirements of the regulation. It can avoid the economic loss or accident caused by grounding failure timely. Due to the presence of mutual inductance between the leads, the measuring signal can be interfered, thereby affecting the measurement results. Based on this, the article firstly analyzes the influence mechanism of the mutual inductance between two parallel lines, and derives the additional resistance R caused by the influence of mutual inductance on the line. Then, due to the influence of mutual inductance with the change of the lead angle, the influence of mutual inductance can be converted into the effect of different angles on the measurement results, and the optimal angle value can be calculated by mathematical operation. Finally, setting up the experimental platform and carrying on the experimental verification. The results show that the measurement error can be minimized when the angle between the voltage pole and the current pole closes to 30°, which is beneficial to the analysis and improvement of the measurement accuracy of the grounding resistance tester. At the end of the paper, a briefly analysis is made on the methods of the ground resistance measurement treatment in the case of non-uniform soil.

关 键 词：接地电阻测量 三极法 电压极 电流极 夹角 

分 类 号：TM934.1[电气工程—电力电子与电力传动]