Detection of Winding Faults Based on a Characterization of the Nonlinear Dynamics of Transformers.

The electrical-mechanical dynamics of a transformer may be described by a model with cascade-connected linear and nonlinear parts. This paper shows that mechanical faults have a significant influence on the linear part of the model. A change in the system order of the linear part of the model can be used as an indicator of variance in a transformer's physical characteristics. A technique based on ...