Since the introduction of the IEC 60076-18 (Edition 1.0) standard in 2012, the Sweep Frequency Response Analysis (SFRA) method has become one of the most common electrical tests for condition diagnosis of power transformers. It provides comprehensive information about the mechanical and electrical integrity of the active part of power transformers.
In contrast to traditional diagnostic methods, the SFRA is sensitive to external electrical interferences which may limit the comparability and can consequently lead to misinterpretation of the measurement results.
This article discusses the theory of different noise sources and noise suppression techniques. Different case studies show the efficacy for measurements even in harsh conditions.
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