Researches of 10kV/10kA IGCT module for DC circuit breaker

This article introduces a 10kV/10kA module for DC Circuit Breaker(DCCB) based on 4-inch IGCT(Integrated gate commutated thyristor). The turn-off capability of 4-inch IGCT under reliable snubber conditions is researched at first. Then, the current-balancing experiment of the module is introduced. It is found that two IGCTs in parallel have a special current distribution problem at the moment of turn-off. The main influencing factors of current-balancing is analyzed during the module experiment. That is, the pressure distribution problem of IGCT is the major factor against current-balancing. Combining simulation and pressure experiments, the current-balancing problem of IGCT in parallel is solved by optimizing the module structure. The current-balancing coefficient of module is improved to above 0.93. Finally, the module passed the turn-off test verification of 10kA successfully, promoting the development of IGCT in the field of DCCB.