Influence of measurement parameters on frequency response analysis diagnosis of oil-immersed transformer

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[1] [1,Sano, Takahiro
[2] 1,Miyagi, Katsunori
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| 1600年 / John Wiley and Sons Inc卷 / 186期
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Appropriate monitoring and maintenance become important as an oil-immersed transformer ages. Generally; dissolved gas analysis (DGA) is effective for the online diagnosis; and if an abnormality is detected; frequency response analysis (FRA) is effective for the offline diagnosis to localize the failed part. FRA diagnosis detects a slight change of waveforms; however; external factors may influence the results. Here; we discuss the influence of an insulating oil presence; tap position; and measurement lead wire length as possible parameters that influence the FRA characteristics. We confirmed that the measurement parameters examined here greatly influenced the FRA characteristics. In the actual diagnosis; it is important to remove these external parameters as much as possible; and keep a detailed record of the measurement parameters. © 2013 Wiley Periodicals; Inc;
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