PROTECTIVE DEVICE FOR DISTRIBUTION SYSTEM AND PROTECTION METHOD FOR DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a protective device for a distribution system capable of suppressing unnecessary opening of a load switch due to the occurrence of an excess current, caused by accidents outside the premises of a consumer, and to provide a protective method for a distribution system.;SOLUTION: Whether a short-circuit fault has occurred is determined in the power supply side or in the load side of the load switch 16 arranged on a lead-in wire 13 during occurrence of the short-circuit fault, and the load switch 16 is opened or maintained of input, on the basis of the determination results. Namely, when it is determined that there is a short-circuit direction is in the premises (the load side of the load switch 16), a control part 35 excites a trip coil 25 and opens the load switch 16. When it is determined that the short-circuit direction (a short-circuit position) is located outside the premises (the power supply side of the load switch 16), the control part 35 will not excite the trip coil 25 and maintains of input for the load switch 16.;COPYRIGHT: (C)2006,JPO&NCIPI