Influence of Grounded Transformers on the Sensitivity of Ground Distance
Maksim Semenov · Advances in engineering research/Advances in Engineering Research · 2022
Distance protection allows you to protect power lines from short circuits to the ground.There are a lot of grounded transformers in the power system, which are a source of recharge current in case of short circuits to earth.This recharge affects the operation of distance protection and may cause non-selective disconnection of damage on the line.A power system model was built in the PSCAD software package, which showed the operation of distance protection in case of a short circuit to earth in a network with grounded transformers.Simulation analysis showed that the sensitivity of distance protection decreases in the presence of grounded transformers.It is possible to increase the sensitivity by increasing the compensation coefficient of the zerosequence current from the calculated nominal value.