| 摘要 |
A method and a device for detecting ground faults in a network for distribution of electric power from a power station from which a number of lines, included in the network, emanate and where the ground fault current IJ of each line is measured. According to this method, that line is selected (10) which shows the greatest active ground fault current IJR (8), alternatively the greatest ground fault current IJ, or the greatest change in the ground fault current DELTA IJ. Thereafter, the measured ground fault current, or the change thereof, in the selected line is compared (12) with at least one predetermined reference value (11). A fault indication is obtained (13) at a level exceeding the reference value. |
