| 摘要 |
PURPOSE: To provide a protective device for feeding equipment which can surely detect the generation of an accident current, facilitate the maintenance, and stabilize the operation. CONSTITUTION: A current transformer 38 and a breaker 36 are connected to each of a supply circuit SC for supplying d.c. power to a d.c. bus DB and a d.c. circuit DC for supplying the d.c. power supplied to the d.c. bus DB further to respective feeding electric wires L, and further an auxiliary contact 56 for detecting the open and close state of the breaker 36 is provided for every breaker 36. A control device 18 performs the processing of unusual detection such as the ground fault detection of the d.c. bus DB, the reverse current detection of the supply circuit SC and the unbreakable detection of the breaker 36 on the basis of the detection result of the current transformer 38 and the auxiliary contact. As a result, since an arc detector and the like which are conventionally used for this kind of processing, have large aged deterioration and take time for maintenance become unnecessary, maintenance becomes easy and operation becomes stable. |
