Research on application of power semi-conductor to Current Interruption in a Low-Voltage DC Delivery System

本研究课题系列提出了以在低压直流输电系统下使用为目的的IGBT（绝缘栅双极型晶体管）构成的断路器。施加在模型断路器上的电流中断显示，模型断路器在8-9 ms的中断时间成功地中断了DC 80 A，几乎与DC电源电路的时间常数无关。此外，作为一种进化方法，断路器元件的电路配置设计，以减少由正向电压降所造成的功率损耗。在此基础上，设计了一种带继电器的断路器模型。实验结果表明，功率损耗降低。作为进一步发展的技术，还设计了电流抑制单元，以降低施加在断路器上的开断负荷。电流抑制被证明在上升期间具有电流的抑制作用。

The series of the present research project has proposed the circuit breaker composed of an IGBT(Insulated Gate Bipolar Transistor) with the aim of usage under low-voltage DC delivery system. Current interruption imposed on the model circuit breaker revealed that the model circuit breaker successfully interrupted a DC 80A at an interrupting time of 8-9 ms, almost regardless of the time constant of a DC supply circuit. Furthermore, as an evolution methodology, a circuit configuration of circuit-breaker components was contrived to reduce the power loss caused by a forward voltage drop. Based on this design, a model circuit breaker combined with a relay was constructed. The experimental result demonstrated reduction of the power loss. As a further evolution technology, a current suppressing unit was also contrived to decrease the interrupting duty imposed on the circuit breaker. The current suppression proved to have the suppression function of the current during the rising period.