METHOD FOR LOCATING FAULT-POINT OF PARALLEL TWO LINE SYSTEM

摘要

PROBLEM TO BE SOLVED: To locate a fault point of a ground fault of one line at one point of a power feed line consisting of high resistance parallel two lines with the use of current, voltage data of a zero-phase terminal not on the side of a power source. ;SOLUTION: Based on a zero-phase current of each line at a zero-phase terminal T₂ not on the side of a power spruce, a differential current ΔI₀₂ of lines is calculated, a zero-phase voltage V₀ is the terminal T₂ is calculated, a coefficient ρ is obtained from an equation ρ=V_on.|ΔI₀₂|/I_on.|V_o| (V_on is a rated zero-phase voltage and I_on is a ground fault current at the time of one line complete ground fault), and a distance (x) to a fault point from the terminal T₂ is obtained according to (x)=d(1-ρ) ((d) is length of the line).;COPYRIGHT: (C)1997,JPO