一种多频扫描式杆塔接地电阻的测量方法

A Multi-Frequency Sweeping Method of Measuring Tower Grounding Resistance

针对目前杆塔接地电阻测量方法效率低下、精度不高、适应性不强的问题,提出了一种不断开接地引线、多频扫描式杆塔接地电阻的测量方法,其基本原理是在不断开接地引线的条件下,向杆塔接地体中注入频率可调的激励电流,测取不同注入电流频率下被测杆塔的接地电阻值,依据测量数据采用数据拟合方法计算被测杆塔接地电阻的精确值。给出了多频扫描式杆塔接地电阻的准确测量模型,并进行了准确测量时影响因素分析及注入激励电流频率范围的确定方法。同时,构建多频扫描式杆塔接地电阻测量系统进行实地测量实验。结果表明:所提出的方法可以实现不断开接地引线杆塔接地电阻的准确测量,比现有测量方法具有更高的测量精度和更好的实用性。

This paper put forward a new method of multi-frequency sweeping tower grounding resistance measurement in view of the faults of the existing measurements such as low efficiency, low accuracy and limited applicability. The basic principle is to inject adjustable frequency to tower grounding to measure the tower grounding resistance, and to get the accurate tower grounding resistance with the data fitting algorithms. A multi-frequency sweeping measurement model was given, and the influencing factors were analyzed. The range of injected current frequency was confirmed. What＇s more, a multi-frequency sweeping tower grounding system was constructed to do the experiment. The results show that the method can accurately measure the tower grounding resistance with grounding connected, which has a higher efficiency, accuracy and a better applicability.