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

本课题系列研究提出了一种由绝缘栅双极晶体管(IGBT)组成的断路器，用于低压直流输电系统。对模型断路器施加的电流中断表明，模型断路器在8-9ms的中断时间内成功地切断了DC 80A，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，设计了一种断路器组件的电路配置，以减少正向压降造成的功率损失。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，降低了功率损耗。作为进一步发展的技术，还设计了电流抑制单元来降低施加在断路器上的分断负荷。实验证明，电流抑制具有对上升段电流的抑制作用。

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.