Definition of criteria to operate 20 kV networks with arc suppression coils according to standards

E. ON Bayern is the largest regional network operator in Germany. The area of supply is 54,000 km² and covers the regions East Bavaria, Upper Bavaria, Upper and Lower Franconia. The utility supplies customers with heat, gas and electrical energy. The total length of medium voltage and low voltage lines is about 140,000 km. In the largest region East Bavaria one hundred and thirty four 20 kV networks are operated. These supply regions are mainly rural and large areas are difficult to access. Nearly all networks are operated with arc suppression coils and are mixed networks with cable and overhead lines. This paper gives the criteria to operate the 20 kV networks of East Bavaria with arc suppression coils according to standards.