DC Circuit Breaker Interrupting Characteristics Based on Resistive Superconducting Current Limiter Quenching Voltage Charging
摘要
Resistive type Superconducting fault current limiter (R-SFCL) can be combined with DC circuit breaker (DCCB), which can suppress the DC fault current and decrease the interrupting requirement. However, the resonant capacitor of the forced zero crossing DC circuit breaker (DCCB) need to be pre-charged with a higher voltage, which reduces the opening reliability. In this paper, the resonant capacitor of DCCB is charged by the quenching voltage of R-SFCL (self-charging SFCB), so as to realize adaptive charging of different short-circuit currents. The resonant capacitor charging characteristics by the quenching voltage of R-SFCL is analyzed through simulation, and the simulation results is verified by experiments. Subsequently, the superconducting current limiter self-charging interrupting experiments is carried out. The experimental results show that the superconducting current limiting can limit the 20 times critical current (Ic) by 60.2%, and the resonant capacitor voltage can reach 86.2% to 96.1% of the peak voltage from zero, and realize zero-crossing and interrupting, which can effectively guarantee the safety and stability of the power equipment and power system.