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A calculation of the earthing system in a 110/35/10 kV substation using the software package CDEGS is presented in this paper. Also, dangerous touch and step voltages in the same substation were measured using the U-I method in real-life conditions. The aim of this paper is to show the complexity of procedures for earthing system design in a substation, correct and quality performance in accordance with regulations and the law, and monitoring and periodic control measurements during service. Continuous control and analysis of calculation results and measurements guarantee the achievement of correct technical functions and safety of people and animals from injuries by electricity.

This paper describes solving of fields around grounding electrode using Markov Chains -Monte Carlo Method (MCMC). For systems with a very large number of elements and millions of equations which need to be solved, this method is often not applicable as it requires very long computation time. Therefore, it is necessary to improve existing algorithms and methods or develop new ones. The paper presents such attempt -development and application of ConJugate Gradient Method (CGM) mathematical model with Compressed Row Storage (CRS) format in solving fields around grounding electrode. For this, MCMC is used on two dimensional model with set boundary conditions with the aim of rapid computation of very challenging problems. As an illustration of the proposed method possible application, calculations of thermal fields in the soil around grounding electrode during intensive wave of current are presented.

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