| 摘要 |
The invention relates to a method and a device for determining an earth-faulted branch in an extinguished power supply network. Said method consists of the following steps: a) selection of physical measuring quantities and measurement of said quantities; b) determination, for each branch, of a degree of agreement corresponding to the presence of an earth fault from selected measured quantities and a conduction model, using a first evaluation method; c) determination, for each branch, of a degree of agreement corresponding to the presence of an earth fault from selected measured quantities and a conduction model, using at least one second evaluation method which differs from the first method at least as regards the measured quantities evaluated and/or the conduction model and/or evaluation; d) linkage by a logic operation of the degrees of agreement determined by the first and second method so that a overall degree of agreement is obtained for each branch; e) indication of an earth fault for a branch if the overall degree of agreement for this branch exceeds a defined value. The method and device provided for in the invention permit the highly reliable detection and indication of especially short as well as particularly high-ohmic earth faults. |
