电力系统接地网缺陷诊断方法及发展趋势

Defect diagnosis methods and development trend for grounding grid

针对电力系统接地网腐蚀、断裂等故障的定位和定量评估问题,总结分析了接地网缺陷评价方法,将目前应用的或潜在的诊断方法分为两类,一类为非成像接地网状态检测方法;一类为接地网状态成像检测方法,论述了变电站接地网缺陷诊断评价方法现状。同时,对变电站接地网状态评价方法的发展趋势进行展望,指出了准确获得反映接地网故障的高分辨率特性参数图像意义重大,提出了实现接地网高分辨率图像重建面临的困难。接地网状态成像检测方法是非常值得研究的课题,将为接地网状态诊断带来一种全新而有效的新方法。

The grounding grid plays an important role in the safe and reliable running of substation. The study ondetection and fault diagnosis of grounding grid will provide an effective means for its state evaluation. This paper analyzes evaluation methods that aim at accurate positioning and quantitative evaluation of corrosion and breakpoint for power system grounding grid. Diagnostic methods with great potential application or being applied are divided into two categories： non-imaging detection methods and grounding grid imaging. This paper discusses the status quo of defect diagnostic methods for grounding grid. At the same time,the paper reveals the developing trend of condition evaluation for power system grounding grid,the significance of the high-resolution image reconstruction that reflect the characteristic of grounding grid,and also the difficulties faced by high-resolution image reconstruction for grounding grid respectively. The imaging method for grounding grid is worthwhile to be studied,and it will bring a new and effective method to state diagnosis for grounding grid.