| 摘要 |
A method for detecting a fault in an electrical machine comprises the steps of carrying out (30) a first measurement on the machine during a normal operation of the machine to obtain a first set of values; analysing (40) the first set of values to obtain a first fault indication; interrupting (70), as a consequence of obtaining the first fault indication, the normal operation of the machine; choosing (60), on the basis of the type of the first fault indication, a second measurement from a plurality of alternative measurements; carrying out (80) a second measurement on the machine when the normal operation of the machine is interrupted to obtain a second set of values; analysing (90) the second set of values to obtain a second fault indication; and determining, on the basis of whether the second fault indication is obtained or not, whether the fault is present or not. A fault indication obtained with a less reliable but a convenient method can be confirmed by applying a more reliable but a less convenient method. The combination of the two methods results in a reliable method with a good ability to detect faults without triggering too many false alarms. |
