engleski

Computer Aided Design of Transformer Station Grouding System Using CDEGS Software

In this paper a computer-aided design of transformer station grounding system is presented. The fault conditions in a transformer station can produce huge damages on transformer station equipment if the grounding system is not designed properly. A well designed grounding system is a very important part of the project for transformer station design as a whole. In this paper a procedure of transformer grounding system design and spatial distribution of touch and step voltage on the ground surface level is analysed by using the CDEGS (Current Distribution Electromagnetic Interference Grounding and Soil Structure Analysis) software. Spatial distribution is needed for checking and finding dangerous step and touch voltages above and around the transformer station. Measured apparent earth resistivity data is performed and analyzed using the RESAP module of the CDEGS software. Because of a very high current flow into the grounding system during the single line to ground fault or three phase fault in the transformer station, very high and dangerous potentials can be induced on the metallic structures including the fence, which can cause dangerous situations for the people and animals near the station and the personnel inside the station. The PLOT module of CDEGS is used to view the results of the scalar potential, step and touch voltage on the surface. Graphic displays include equipotent contour lines and potential profiles (gradients) in 3D and 2D perspective and apparent soil resistivity (.m) versus inter electrode spacing (m). Results of alternative grid designs may be displayed simultaneously for the purpose of comparison.

computer-aided design; substation; grounding grid; soil; safety; touch and step voltage

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