METHOD OF DETERMINING POINT OF FAULT IN POWER LINE Russian patent published in 2010 - IPC G01R31/08 

FIELD: physics.

SUBSTANCE: current for the fault condition and the condition before fault in all terminal stations is measured. Phase voltage for the fault condition and the condition before the fault is measured in one terminal station of the line of the system. A certain hypothetical fault location is assumed. The distance to the hypothetical fault locations and resistance at the point of fault are calculated. The actual point of fault is selected through a first comparison of numerical values of distance to hypothetical fault locations and by dropping those results whose numerical values are negative or greater than one in relative units, and then by analysing calculated values of resistance at the point of fault and dropping those results whose fault resistance is negative. If there is still more than one value which is not dropped from the calculation results, a fair result is selected by analysing values of calculated corresponding impedance values of equivalent sources.

EFFECT: possibility of determining the point of fault for a system with passive and with active branches, resistance to conditions before the fault.

17 cl, 19 dwg