| 摘要 |
The invention refers to a method for detection of earth faults in electrical distribution networks with three phases, which during a predefined period of time includes comparison of the current change in a first (A) of the system's phases with the current changes in the second (B) and third (C) phase during the same period of time. A first requirement for an earth fault to be considered detected is, that the current change (310) in the first phase (A) during the mentioned time period to its amplitude or direction in a predefined way differs from the current changes (311, 312) in the second and third phase in the system. |
