A Simulation of Electrical Transient on 115kV High Voltage Equipment in Substation caused by Capacitor Bank Switching

This paper presents a transient simulation for electrical stress analysis due to capacitor bank switching in a 115 kV substation. The actual data of all equipment in substation is used in the simulated circuit and the simulation is performed by using ATP/EMTP program. The simulation cases focus on the switching of capacitor bank causing high electrical stresses such as high magnitude and frequency of inrush current, transient recovery voltage, and rate-of-rise of recovery voltage to equipment. The switching overvoltage caused by capacitor bank switching could lead to the non-linear voltage distribution along the winding insulation of current transformer, which could probably lead to insulation damage, Therefore, the current transformer is modelled and the voltage distribution along the…