The intensive use of the underground cables in distribution systems, eventually, results in the total phase-ground capacity of the system to increase. High magnitude of capacitive currents causes capacitive current based sympathetic tripping problem to occur frequently at the distribution system. Directional protection relays may be used to eliminate the sympathetic tripping problem and protect the system selectively. However, it should be known that selective operation of directional relays entirely depends on suitable angle settings. Non-properly angle settings may cause mal operation of directional protection relays. Thus, angle setting of directional protection relays is utilised considering cable cross section area, cable length, parallel feeders number and neutral earthing resistance in this study. The efficiency of the selected angle settings methodology has been confirmed over a field-case distribution system.
Cite this article as: Atsever MB, Karacasu Ö, Hocaoğlu MH. Determination of Proper Angle Settings in Resistance Grounded Distribution Systems for Directional Earth Fault Relays. Turk J Electr Power Energy Syst, 2021; 1(1): 26-32.