| 摘要 |
PURPOSE:To enable uninterruptive operation of a load by selecting a three-phase AC power supply and a three-phase load on the 200V side of a composite insulating transformer and a single-phase AC power supply and a single-phase load on the 100V side thereof through a preferred function selection circuit and by interlocking and switching them. CONSTITUTION:On the primary side of a composite insulating transformer 5, a three-phase 200V input 1 is inputted from terminals R-T and connected with windings tr3, tr4 and also with three-phase 200V load terminals R1-T1. On the secondary side of said transformer 5 as well, a single-phase 100V input is inputted from terminals R2, S2 and connected with windings Tr1, Tr2 and also with single-phase 100V load terminals U1, V1 and U2, V2. Normally, a 100V single-phase input 9 drives single-phase 100V outputs 1, 2 and a 200V three-phase input 1 drives a three-phase output 3, but when one power input circuit is abnormal, preferred function selection circuits 2, 7 operate to interlock relays 4, 8 and 10 and to transmit 100V side and 200V side power via said transformer 5. Thus, it is possible to continue the uninterruptive operation of each load. |
