| 摘要 |
PROBLEM TO BE SOLVED: To provide a device that is linked to a countermeasure for a momentary power interruption capable of shortening a time substantially from the occurrence of a failure until a power system is cut off. SOLUTION: This device that is linked to a countermeasure for the momentary power interruption combines two power supply systems having at least a power supply, of the power supplies and loads, and, if a failure occurs to one of the combined power supply systems, breaks the combination of the other one. On this device, a semiconductor switch and a controlling device are provided; the switch is structured by connecting to each phase of the power supply an inverse-parallel connection circuit in which the series-connection circuit is connected inversely of a semiconductor switching element or a plurality of semiconductor switching elements, and the controlling device detects a failure of the power supply systems, holds the 'on' state of the switching element until a failure occurs, and changes over the switching element to an 'off' state the instant a failure occurs. |
