Turbogenerator harmonic sensitivity in rotor short-circuit identification

This paper intends to examine the capability of detecting field winding short circuits in round rotor synchronous machines through the terminal voltage harmonic analysis. A time-based approach is developed, and several machine configurations are simulated in normal condition and in the presence of a rotor fault to find expected induced voltages and analyze the method sensitivity. Comparisons indicate trending behaviors, useful for monitoring and fault diagnosis.