Research On Great Hydropower Station Grounding

The paper adopts the integrate method of theory and project experience, go deep into the research of grounding issue of the design f great hydropower plant (HPP).Because of the important statues of the grounding system for the design of great hydropower plant (HPP), especially to lower the value of grounding resistance in high-soil-resistance area not only play an extremely important roles for the security and reliably operation of SCADA, relay protection, RTU and communication system, but also important for the person safety. So we must study it specially and put forward to a corresponding solve scheme.The paper choice the reservoir grounding network, which take the key effect for lowering the grounding resistance of the whole hydropower station (especially the HPP in high-soil-resistance area), separately use plane two (multi-) layer soil model and vertical three layer soil model. And according to the characteristics of reservoir, use boundary element method (BEM) to do numerical value calculation. In the calculation process, some predigest according to real condition for the function will be adopt to write a calculation program near to the practice of project.Using several example of soil model calculation to analyses the main influence factor of HPP grounding resistance. And according to the need of project design, a emulate calculation will be taken to calculate the reservoir grounding network resistance in different water lever and different arrangement. It is can do better to server the practice need and the result can be used to instruct the design of project.The paper show the structure and function of each module of the grounding resistance calculation program which adopt BEM. And predict the primary concept and difficult will be faced when consummate this process using this method.