The transformer substations is one of the most important parts of the electrical power system, therefore studying how to protect it against fault currents by making a reliable design of a grounding system is very important. The aims of a grounding system are to provide safety to the personnel during normal and fault conditions and to assure correct operation of electrical devices and to prevent damage of electrical apparatus. Thus, the main contribution of this paper is to show the main concept of practically designing the grounding system of a substation.[1]
the parameters that affect the design of grounding system for the substations, e.g.:-soil resistivity according to a practical model, showing how to decrease the resistivity of low conductivity soil such as solid lime stone .By using new technology in filling enhancement earthing material such as (Marconite) and mixing it with salt and coal at different ratios to get optimum and economical design .Tolerable values of touch and step voltage are achieved while ground resistance is improved.
A grounding system design requires several
iterations before obtaining a safe configuration. This requires time consuming. Many factors will effect on the ground system performance such as topology and dimensions of the grounding system, burial depth, type and characteristics of the soil structure and material used for the grid’s conductor's horizontal wires and grounding rods, etc.
In this paper, soil treatment with using filling enhancement erthing material is thoroughly investigated. |
