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Estimation of Line Zero Sequence Impedance using Real Field Fault Data for Fault Location Application

The paper presents how the zero sequence parameters of the line can be estimated using the real field zero sequence quantities of voltage and currents from both ends of the line, after the occurrence of an unbalanced fault involving the ground. The new zero sequence parameters of the line calculated in this way are different that the ones implemented in the real relays. Furthermore, these new estimated line parameters are used to calculate again the fault locations from both ends of the line and the results show fairly improvements when they are compared with the results provided by the real relays.