Sweep Frequency Response Analysis - MaxiCont - Fooldal

Sweep Frequency Response AnalysisTransformer Diagnostics Diagnostics is about collecting reliable information to make the correct decision Making the correct decisions saves moneySFRAOil analysisSFRAFDSW inding ResistanceSFRA testing basics Off-line test The transformer is seen as a complex impedance circuit [Open] ( magnetization impedance ) and [Short] ( short-circuit impedance ) responses are measured over a wide Frequency range and the results are presented as magnitude Response (transfer function) in dB Changes in the impedance/transfer function can be detected and compared over time, between test objects or within test objects The method is unique in its ability to detect a variety of winding faults, core issues and other electromechanical faults in one testDetecting Faults with SFRA Winding faults Deformation Displacement Shorts Core related faults Movements Grounding Grounding Screens Mechanical faults/changes Clamping structures Connections And testsTransformer ATransformer ATransformer BTime basedDesign basedTransformer ATransformer BType basedSFRA Measurement philosophyNew measurement = Reference measurementBack in ServiceNew measurement Reference measurementFurther Diagnostics RequiredSFRA MeasurementsFRAX measurement circuitrySFRA AnalysisSFRA Analysis tools Visual/graphical Analysis Low Frequency responses for [Open] (excitation impedance) [Short] (short-circuit impedance) Expected shape of star and delta configurations Comparison of fingerpri

SFRA testing basics Off-line test The transformer is seen as a complex impedance circuit [Open] (“magnetization impedance”) and [Short] (“short-circuit impedance”)

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  Analysis, Response, Frequency, Fsra, Frequency response analysis

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