1　引言近年来 ,由于地网接地线及导体截面不够 ,而引起的重大设备事故屡有发生。从一些雷击事故的调查分析报告中可以看到 ,因输变电工程接地装置不合格给电力网安全运行带来的破坏占有很大的比例。因此 ,农网建设和改造中确保接地装置的工程质量就显得尤为重要。具体地讲 ,需 1 Introduction In recent years, due to ground wire and conductor cross-section is not enough, and caused major equipment accidents have occurred. As can be seen from the investigation and analysis reports of some lightning accidents, the failure caused by the failure of the grounding device of power transmission and transformation project to the safe operation of the power grid occupies a large proportion. Therefore, it is very important to ensure the construction quality of the grounding device in the construction and transformation of rural power network. Specifically, you need