Controlled switching is used for elimination of harmful electrical transients upon planned switching of mainly Capacitor Banks, Shunt reactors and Power Transformers. The control switching of Capacitor Bank using Controlled Switching Device (CSD) product has been used in order to reduce the inrush current when closing the circuit breaker. With the approach presented in this paper, power systems are capable of Switching on and off Capacitor Banks as needed. The basic aim is to control closing to minimize the energizing transients (voltage transients as well as inrush currents), to improve interrupting performance and controlled opening can also be utilized.

Keywords : CSD, Optimum switching time, Controlled switching of Capacitor Banks, Rate of decrease of Dielectric Strength (RDDS), Switching Transients, Power quality, Closing operation, Opening Operation