Simplified two layer model substation ground grid design methodology

A simplified approach to the design of substation ground grids in nonuniform soil conditions is presented. The procedure is based on the interpretation of principles enunciated in the IEEE Standard 80-1986. The supporting data were obtained from actual field tests on substation ground grids. The mesh voltage, ground potential rise (GPR), ground grid resistance, grid current, overhead ground wire (OHG), and neutral conductor influence, etc. need to be treated as an interdependent system. How each item is used in the computer model is described. Use of each item in the computer model is based on the results of field tests and subsequent analysis (using substation grounding theory) of field data. The individual terms used in the document are defined. the procedure used to determine the effect of the various parameters which influence the grid design is described