| 摘要 |
A method and an apparatus for use in locating a phase-to-phase fault on a three-phase electric line (30) of an electric network, the apparatus (40) comprising means for determining phase-to-phase fault loop reactance unbalance correction factors on the basis of values of current and voltage quantities during one or more three-phase faults, means for determining a phase-to-phase fault loop reactance and an initial estimate of a distance between the measuring point (40) and the point of fault (F), means for determining a phase-to-phase fault loop reactance unbalance correction factor to be used on the basis of the initial estimate, means for correcting the determined phase-to-phase fault loop reactance with the determined correction factor to be used, and means for determining a corrected estimate of the distance between the measuring point (40) and the point of fault (F) on the basis of the corrected phase-to-phase fault loop reactance. |
