| 摘要 |
A method and a device for determining the direction to a fault on a power transmission line in relation to a measuring station with the aid of phase currents and voltages, measured in the measuring station, by means of which change values DELTA U in the phase voltage, change values in the phase voltage DELTA UM of a line model and change values in the derivative DELTA I' of the phase current can be determined, and wherein for each measuring loop phase-ground the signal DELTA QL=( DELTA U- DELTA UM)x DELTA UI' is formed and if this value is smaller than a negative value assumed in advance, a fault lying ahead, in relation to the measuring station, has been detected, and wherein for each measuring loop phase-ground the signal DELTA QB = DELTA Ux DELTA UI' is formed and if this value is greater than a positive value assumed in advance, a fault lying behind, in relation to the measuring station, has been detected. |
