| 摘要 |
The method and device determines, at an observation point in a faulty line carrying electric power, a parameter of the fault such as the distance between the observation point and the fault or the direction of this fault. As a fault current signal, the device uses a signal i'AB formed in 4a, 4b by the difference between a current measurement signal iAB and a virtual current signal corresponding to extrapolation from a current measurement signal present before the appearance of the fault. <IMAGE>
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