Modelling and analysis of current and potential distribution paths for grounding devices

Abstract

This study proposes and develops a mathematical formulation that helps to clearly understand the current and voltage distribution in the damaged and physically integrated horizontal elements of grounding systems. This realistic mathematical model of the grounding device with damaged elements will help to estimate the current and voltage distribution at the generating substation and will improve safety conditions for staff and equipment and reducing damages associated with equipment failures. It will also provide the basis for developing novel grounding integrity detection techniques.

A new monitoring technique for the grounding grids

“…After the injection of the test current into the grid, signals captured on the surface of the earth above the grid can be processed and the damaged horizontal element and the location of its failure can be pinpointed. The experimental studies showed and proved the validity of provisions obtained from the mathematical and computer modelling [11]. As one can see from Figure 4(b), if the horizontal element in the grounding grid does not have any failures, the distribution of the potential and current along the grid and electromagnetic field over the grid will have even character without steep drops.…”

“…The grounding grid area is approximately 16 sq. m. During the experiments, an AC source was connected in different ways to create a number of circuits for different analysis [10,11]. After the injection of the test current into the grid, signals captured on the surface of the earth above the grid can be processed and the damaged horizontal element and the location of its failure can be pinpointed.…”