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SFRA testing basics. ▫ Off-line test. ▫ The transformer is seen as a complex impedance circuit. ▫ [Open] (“excitation current”) and. SFRA TOOL FOR. DETECTING “HIDDEN”. TRANSFORMER FAULTS. M5400. Sweep Frequency Response Analyzer. DOBLE OFF-LINE TESTING & ASSESSMENT. BENEFITS. Analyzer (SFRA) Library and Compensation. Designer. User's Guide. Literature Number: SPRUHZ5A. October 2014–Revised February 2015 Sweep frequency response analysis (SFRA) for the assessment of winding displacements and deformation in power transformers. The method of testing a high-voltage apparatus (transformer) involves exciting the apparatus with the SFRA instrument. Take care to avoid contact with the Frequency Response Analysis, SFRA, Noise, Interpretation, Dynamic Range, IEC 60076-18, Mechanical Condition As- sessment, Power Transformer, Electrical