一种实用的接地电阻测量新方法

A New Method for Testing Grounding Resistance

在电力系统保护装置中,接地网是一个很重要的设施。从电流线与电压线30°夹角法接地电阻测试原理出发,指出在接地电阻测量过程中,若电流线与电压线呈30°夹角准确放线有困难时,可以通过多次不同角度放线测量方式,以补偿法获取较为准确的接地电阻,同时还可获取等效土壤电阻率。文中还通过实例计算验证了提出方法的可行性。

Grounding grid is the important protective equipment for power system. The paper analyzes the measure principle of grounding resistance in grounding grid, in which the testing voltage ＆ current lines must be a given angle with 30°. But in fact, the testing position may not be in field. So a new testing method is proposed in this paper via computing the compensation of the grounding resistance. For obtaining accurate grounding resistance by this method, the voltage and current lines mustn t be the given angle, at the same time, equivalent soil resistively is also obtained. At the end of the paper, the feasibility of the proposed method is verified by a testing example.