Simulations on Interruption of Circuit Breaker in HVDC System with Two Parallel Transmission Lines

This paper describes the Erectro Magnetic Transients Program (EMTP) simulation results for a study on specifications and duty of an HVDC circuit breaker in an HVDC system. The HVDC breaker employs an inverse current injection method and a capacitor precharged from the line voltage. The HVDC system is mono-polar, but has two parallel transmission lines and is the simplest multi-terminal system. The simulations demonstrated that the HVDC breaker can interrupt successufully under various breaking conditions.