输电线路杆塔接地电阻的测量方法分析

Analysis on grounding resistance measurement of transmission lines and towers

文中分析接地电阻测量原理,详细介绍工程上应用较多的直线三极法,研究影响测量准确度的因素并给出相应的处理措施。通过实例证明,零电位参考点选取的正确与否以及对测量结果的判断是保证接地电阻测量准确的关键;基于GPS定位的直线三极法,可有效提高测量准确度。

The level of lighting trip on transmission lines is affected by the quality of grounding device directly,therefore accurate measurement on grounding resistance of tower is very important.The principle of grounding resistance measurement is analyzed and the linear three-pole method which is applied in engineering frequently is presented in this paper.The factors affecting the accurate measurement is studied and corresponding measures are given.Case studies demonstrate that key factors ensuring accurate measurement are whether the zero potential reference point is selected correctly or not and the judgment on the measurement results.And the measurement accuracy is improved by the linear three-pole method based on GPS effectively.