| 摘要 |
<p>The present invention relates to a power distribution system using a 3-phase power cable. The power distribution system comprises a plurality of 3-phase power cable bundles including concentric neutral cables, the front end of each concentric neutral cable on each phase is grounded simultaneously at each interval in which the concentric neutral cables at each bundle are disconnected and are divided; the back end of each concentric neutral cable is connected to the front end of the next concentric neutral cable in only one selected phase at the next interval, the back end of concentric neutral cable in other phases at each interval is opened; and the power cable in a phase which is selected from the 3-phase power cable is on the same phase at the corresponding interval so that the back end of the each concentric neutral cable at each interval is connected to a front end at next interval. If plural 3-phase power cables are used, the increase of a leakage current flowing in a connection member is prevented by simultaneously grounding the front end of each concentric neutral cable on each phase at each interval to an additional grounding point, connecting the back end of each concentric neutral cable in one randomly-selected phase to the front end of the next concentric neutral cable at the next interval, and opening the back end of the concentric neutral cable in other phases at the corresponding interval, thereby allowing feedback of a ground fault current and raising the ground potential of the concentric neutral cable.</p> |
