Sweep Frequency Response Analysis (SFRA) is a powerful and sensitive method to evaluate the mechanical integrity& electrical condition of core, windings and clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range.
SFRA analysis can detect incipient fault in transformers like:
• winding deformation – axial & radial, like hoop buckling, tilting, spiraling
• displacements between high and low voltage windings
• partial winding collapse
• shorted or open turns
• faulty grounding of core or screens
• core movement & shorting of lamination
• broken clamping structures