The study conducted a detailed analysis of the electromagnetic compatibility of the 110/20(10) kV Srd substation. A numerical simulation of the occurrence of internal and external VFTO overvoltages in the GIS plant of the aforementioned substation was also conducted. Among other things, recommendations were given for the correct / favorable implementation of (mutual) connection and grounding of the armor of the GIS plant parts. The electromagnetic impact of the associated 110 kV cable lines (in the cable tunnel of the substation) on the associated telecommunication lines was also analyzed.