the unit can be started with the breaker or switch opened using the generator step-up transformer as a source of off-site power.
机组可在断路器或负荷开关打开时,采用发电机升压变压器作为一种非本电厂电源来起动。
consequently if we can solve the voltage sharing of igbt direct series connected with several assistant peripheral circuits, step-up transformer isn't necessary and the cost is also reduced.