Fault location of transformer winding deformation using frequency response analysis

FRA (frequency response analysis) is the best effective method that can successfully detect transformer winding deformation. This paper tries to diagnose the fault by the winding´s physical parameter changes. At frequencies lower than critical frequency, the transformer winding may be modeled as a lossless transmission line that the series capacitance could be easily neglected. The parameters of inductance and grounding capacitance may be determined respectively. Any change in these parameters then should reflect the probable position of transformer winding deformation