| 摘要 |
PURPOSE:To eliminate a no load operatuin loss and reduce a running cost by a method wherein two inverter systems and a direct transmission part are provided in parallel with each other and an uninterrupted switching is performed. CONSTITUTION:Two inverter systems 51 and 52 and a direct transmission part 53 are connected in parallel with each other. Normally, a power is supplied to a load 4 by the one inverter system 51 and the remaining one system 52 is in a resting state. If the necessity of switching the transmission system occurs, the transmission system is switched to the direct transmission part 53 first without an interruption and the resting inverter system 52 is made to rise. When the inverter system 52 reaches the state in which it can supply a power to the load, the system is switched from the direct transmission part 53 to the system 52 without an interruption. With this constitution, a no load operation loss can be eliminated and a running cost can be reduced. |
