Abstract
The Sweep Frequency Response Analysis SFRA is a diagnostic technique for detecting winding displacement and deformation (among other mechanical and electrical failures) on power and distribution transformer in which the diagnosis relies on experts' knowledge. SFRA as a diagnostic technique must integrate both the off-line measurements and the interpretation of the data in order to provide a assessment to the condition of the windings, however there is not a guideline for the measurement and the process of interpretation the records has not been defined. This paper presents a revision about the variants in the metrology and interpretation of the SFRA measurements.
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