The Simulation Of Sustained-Release Ion-Grounding System

Power system grounding, especially the power station grounding and substation grounding have always been key issues in the power system.It relates to a range of issues such as the personal safety of staff, the national economy and stable development that whether the grounding system is safe, economic or stable operation. With the continuous development of the national economy, expanding industrial scale, continuously improve people’s living standards, social power consumption increasing,the capacity of power stations and substations are also increasing, the grounding system short-circuit current also increase inevitably, therefore, the performance of the grounding system must be much better.Commonly used at home and abroad to reduce grounding resistance is to take chemical treatment to the local soil to improve the electrical conductivity of soil around the grounding devices. sustained-release ion-grounding system is based on the advantages and shortcomings of the past physical and chemical methods to reduce the grounding resistance,give us the improved sustained-release ion-grounding pole and find out the filler in and out the pole that has better effect, better stability and durability.In order to ensure the safe operation of substation, it is very important to carry out the parameters calculation of the grounding grid in line with actual situation. The paper introduces the theoretical foundation of the numerical calculation of grounding grids-Green’s function,then, we give out the principle and derivation of superposition method and integral method. In the superposition method, we establish the model of the point electrode in two-layer soil and get the formula of the whole electrode’s potential at any point in the upper soil; in anther method, we establish one linear conductor model and two linear conductors model respectively and get their own formula for the average potential as well as the mutual resistance. Based on the above methods, using the method of coordinate transformation, we get the potential formula of grounding system at any point in the two-layer soil.When introducing the calculation of the parameters in the grounding system, the paper introduces the calculation principle of grounding parameters using Green’s function in detail, and gives out the calculation formula of mutual resistance parameters. The paper also gives us that the detailed information on how to use a direct matrix method to calculate the grounding resistance.In simulation, in the same model, based on the above described mathematical theory, changing the parameters, using the simulation software—matlab, programming, taking a large number of ground network simulation and get the optimal values ultimately.