Grounding resistance of energy storage station

Why is grounding resistance important?

The knowledge of the grounding system resistance is essential for the calculation of these voltages in cases of faults. The grounding systems commonly used, consist of single rods, rodbeds or arrays of rods, grounding grids and combinations of the previous types. The grounding resistance of a system can be calculated by various methods.

Why are grounding systems important?

Abstract-- Grounding systems are very important for the safe construction of a substation or a simple building. This paper examines various methodologies for the calculation of different grounding systems, including single rods, rodbeds and grids.

Is grounding resistance of a Rodbed significant?

Grounding resistance of a rodbed (R4) for Case #3 of Table I For this case, the variation between the results is not significant, especially for rod lengths between 2 and 4 m, which correspond to the most common cases. This happens because the resistivity values of the two soil layers do not exhibit great differences.

How do you calculate the resistance of a grounded rod?

An arbitrary potential V is applied to the grounded rod. In the cases examined here, the problem is solved assuming a unit potential 1 V on the grounding system . For this potential, the total current I that flows from the grounding system is calculated by the FEM. Finally, the resistance of the rod can be calculated from these two values.

Is Schwarz a safe method for AC substation grounding?

It is also interesting that the method of Schwarz, using the expression for the equivalent resistivity proposed by the IEEE Guide for Safety in AC Substation grounding leads to results which diverge significantly to those by the FEM.

Do grounding rod resistance values follow the same pattern?

Moreover, the grounding rod resistance values follow the same pattern as in the previous case. Finally, even more significant differences between the methods can be observed in case #5 of Table I. Fig. 6. Grounding resistance of a rod for Case #5 of Table I