Abstract
This chapter contains the following points: design procedure of grounding system according to IEEE 80, methods for calculating the grounding grid resistance (Dwight's formula, Laurent and Niemann, Sverak's equation, Schwarz's Formula, Dawalibi, Mukhedkar's Formula, Chow and Salama's Formula, Nahman's Formula and Heppe's Method). It contains also the design of charts of grid earthing system and application of step and mesh potential in safe grounding system design. This chapter draws attention also to the following points: Grounding resistance of grounding system in non-homogeneous soil, calculations of maximum step and mesh voltages, estimation of minimum buried grid conductor length and finally computerized analysis in grounding design.
Reference11 articles.
1. IEEE. (2000). IEEE Guide for Safety in AC Substation Grounding (standard 80).
2. Laurent, P. G. (1972). Guide sur le calcul l’ ´ex´ecution et la mesure des prises de terre. Rev. Gen. Electr., 53, 455–467, 563–572.
3. Analytical Expressions for the Resistance of Grounding Grids in Nonuniform Soil
4. Analytical Expressions for the Resistance of Rodbeds and of Combined Grounding Systems in Nonuniform Soil