Fig. 1

Grounding grid portion with nodes and segments. Where \({{\o }}_{11}={R}_{11}{I}_{e1}, {\mathrm{ \o }}_{12}={R}_{12}{I}_{e2}, {\mathrm{ \o }}_{13}={R}_{13}{I}_{e3}, {\mathrm{ \o }}_{14}={R}_{14}{I}_{e4}\); \({{\o }}_{22}={R}_{22}{I}_{e2}, {\mathrm{ \o }}_{21}={R}_{21}{I}_{e1}, {\mathrm{ \o }}_{23}={R}_{23}{I}_{e3}, {\mathrm{ \o }}_{24}={R}_{24}{I}_{e4}\); \({{\o }}_{33}={R}_{33}{I}_{e3}, {\mathrm{ \o }}_{31}={R}_{31}{I}_{e1}, {\mathrm{ \o }}_{32}={R}_{32}{I}_{e2}, {\mathrm{ \o }}_{34}={R}_{34}{I}_{e4}\); \({{\o }}_{44}={R}_{44}{I}_{e4}, {\mathrm{ \o }}_{41}={R}_{41}{I}_{e1}, {\mathrm{ \o }}_{42}={R}_{42}{I}_{e2}, {\mathrm{ \o }}_{43}={R}_{43}{I}_{e3}\)