| 摘要 |
PROBLEM TO BE SOLVED: To provide a power line protection device, a power line switch, and a power supply system capable of, even when an error occurs on either one of an external power source and a commercial power supply system, minimizing the influence given to the other.SOLUTION: A power line protection device 4 includes a transformer 43 which is connected to a primary side power line W5a connected to an external power source 2 having a secondary battery 21 and a secondary power line W3 connected to an emergency load 7 therebetween. The power line protection device 4 connects the primary side power line W5a to a primary winding 431 and connects the secondary power line W3 to a secondary winding 432 to thereby isolate the primary side power line W5a and the secondary power line W3 from each other. A power line switch 5 connects an emergency power line W4 to which the emergency load 7 is connected to either one of the secondary power line W3 and a branched power line W2A to which the commercial power is supplied while swishing therebetween. When the commercial power is supplied, the emergency power line W4 is connected to a branched power line W2A, and when the commercial power is not supplied, the emergency power line W4 is connected to the secondary power line W3. |
