| 摘要 |
A method, system and apparatus for determining a distance of a phase-to-earth fault on a three-phase electric line ( 30 ), the apparatus ( 40 ) being configured to determine a first estimate value for a distance between the measuring point ( 40 ) and a point of fault (F) on the basis of a first equation based on a fault loop model of the electric line, in which model the load of the electric line is located between the measuring point and the point of fault; determine a second estimate value for the distance on the basis of a second equation based on a fault loop model of the electric line, in which model the point of fault is located between the measuring point and load of the electric line; and select, according to predetermined criteria, one of the determined two estimate values as the distance between the measuring point and the point of fault.
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