Patent ID: 8222760
Filing Date: 2012-07-17
Classification: F03D,F05B,H02P,Y02E

Abstract:
1. A method for monitoring an operation of at least one proximity sensor of a wind turbine, the wind turbine comprising a rotor shaft, the rotor shaft comprising a pattern comprising a protrusion or a ramp, the at least one proximity sensor being configured to measure a distance between the at least one proximity sensor and the rotor shaft, the method comprising: using the at least one proximity sensor to generate an output, the output depending on a distance between the rotor shaft and the at least one proximity sensor, which distance is measured by the at least one proximity sensor; and comparing the output of the at least one proximity sensor with at least one reference value of the pattern to detect a correct operation of the at least one proximity sensor, wherein the protrusion or the ramp comprises a varying height.