Research on grounding grid safety assessment based on the Field-Circuit model

Grounding grid is an important equipment to guarantee the safety and reliable of power system. It should be diagnosed regularly to prevent from corrosion, which is significant to ensure the safety of people and equipment. It has a significant value to do some research on the algorithm of grounding grid diagnosis. Contact voltage, step voltage and ground resistance are the most important characters to diagnosis. In this paper, an approach based on Field-Circuit Method is proposed. We establish the equation with the use of node voltage method and the transimpedance relationship. And we use the image method to calculate.