METHOD OF SETTING TRIP FUNCTION OF EARTH FAULT IN TRIP APPARATUS, AND TRIP APPARATUS HAVING TRIP FUNCTION DEFINED FOR EARTH FAULT PROTECTION

摘要

PROBLEM TO BE SOLVED: To provide a method for making an earth fault guard mode effective in a trip apparatus and setting one of two or more trip functions for the trip apparatus.;SOLUTION: The trip apparatus includes a processor combined with a trip element in action. One of trip functions is set at the trip apparatus by the processor. When at least one trip function out of trip functions detects indication of the earth fault, the trip characteristic, which intercepts current immediately, is set as I^4t inverse-time function.;COPYRIGHT: (C)2010,JPO&INPIT