Method for checking a field current measurement of a synchronous machine in generator mode

摘要

Method for checking a current sensor (4) for a field current measurement of a synchronous machine (2) in generator mode with controlled exciter current, comprising the steps: - Operating the synchronous machine (2) in the idle mode of the synchronous machine (2), Detecting a phase voltage measurement value (206) of the synchronous machine (2), and detecting the exciter current, - Determining a phase voltage expected value (208) by assigning stored map values (210) for the phase voltage, for the detected excitation current and a detected speed of the synchronous machine (2), and Comparing the phase voltage expectation (208) with the phase voltage measurement (206), wherein if the comparison indicates that the phase voltage measurement (206) is within a value interval between a lower and upper limit then no error signal is generated and an error signal is generated when the phase voltage measurement (206) is outside this value interval.