Abdallah. R. Alzyoud, Eyad Zarour, Fakhri Jarrar, Akram Arar
Distance protection is one of the most important methods used in protection of transmission and distribution lines. It can detect and determine the location of all faults. Operation of distance relays depends on the correct measurement of the current and voltage signals; the voltage and current phasors must be measured very accurately to avoid errors in distance measurement. The most common fault of the transmission and distribution lines is the single phase to the ground fault, the fault current is related to the grounding method. Therefore, the measurement of the impedance seen by the distance relay in the event of ground fault depends on the method of grounding and on the effect of the arc resistance. Distance relay is designed to measure impedance for ground fault (L-G fault), considering the effect of grounding methods using MATLAB simulation and the coordination of 3-stepped distance zones. In this paper simulation models of the electric power system with real technical specifications are introduced using MATLAB/Simulink and NEPLAN software, where the distance protection for the transmission line with different grounding methods are used. Voltage and current waves are illustrated under various faults. The simulation models enable investigation of the earth fault under different methods of grounding. The performance of distance protection is studied taking into consideration the arc resistances and the load encroachment. The obtained results show that the protection schemes are very effective for all types of faults. Arc fault resistance influences the operation of distance relays, thus causing it to give inaccurate impedance measurement resulting to under-reach condition, so it should be considered.
Distance Relay: Grounding: Earth Fault: Modelling: compensation factor
Cite this paper
Abdallah. R. Alzyoud, Eyad Zarour, Fakhri Jarrar, Akram Arar. (2022) Modeling and Simulation of Distance Protection for Transmission Lines with Different Grounding Methods. International Journal of Power Systems, 7, 86-100