Saturation independent detection of dynamic eccentricity fault in salient-pole synchronous machines

This paper proposes a novel scheme based on current signature analysis to estimate the severity of dynamic eccentricity fault independent of saturation in salient-pole synchronous machines (SPSM). The detection technique uses short circuit test data and exploits the presence of inherent static eccentricity in a machine. Implementation of the scheme involves two steps. First, the percentage increases in both mixed eccentricity component and static eccentricity component are computed. Then the difference between them is used as a factor to estimate the severity of dynamic eccentricity. The method is also found capable of distinguishing between static and dynamic eccentricity faults. Results obtained from an experimental 3 phase, 2.2 kW machine have been used to validate the proposed eccentricity severity estimation scheme.