Arc Suppression Devices for Mitigating Single Line-to-Ground Faults and Enhancing Power System Resilience

Single line-to-ground (SLG) faults in power cables connected between delta-connected transformers can lead to severe overvoltages up to 1.5 p.u. and high fault currents exceeding 2000 A, posing significant risks to cable insulation and system stability. This paper proposes an Arc Suppression Device (ASD) that effectively mitigates these adverse effects by injecting zero-sequence voltage into the ground path. Through comprehensive modeling and simulation of a four-bus system using MATLAB Simulink, the ASD reduces fault currents by 97.8%. The implementation of intelligent control logic further enhances performance by reducing voltage restoration time from 0.7 s to just 0.05 s - a 92.9% improvement. The results conclusively show that the ASD not only maintains power quality and system resilience during faults but also extends equipment lifespan by minimizing electrical and thermal stresses. These quantitative improvements represent a significant advancement in power system protection, particularly for delta-connected transformer configurations.