| 摘要 |
The invention relates to a method for detecting a direction in which a fault has occurred in a three-phase electrical medium voltage power supply network (12a) with respect to a metering point (19a, 19b) in the medium voltage power supply network (12a), in which method both phase conductor-related current measured values and phase conductor-related voltage measured values are used by a control device (37) of an electrical protective device (18a, 18b) to detect the direction of the fault, wherein the current measured values are detected at the metering point (19a, 19b) in the medium voltage power supply network (12a). In order to detect the direction in which a fault has occurred with respect to the metering point (19a, 19b) as easily and hence as cost-effectively as possible, according to the method the voltage values measured on the low voltage side of a transformer (13) connecting the medium voltage power supply network (12a) to a low voltage power supply network are detected. The invention also relates to a correspondingly equipped electrical protective device (18a, 18b). |
