Case Study on Fault Diagnosis of the Actual Operating Transformer by FRA

Sano, Takahiro; Ogawa, Yoshiharu; Shimonosono, T.; Wada, Tadayuki

doi:10.1541/ieejpes.131.78

Cited by 2 publications

(1 citation statement)

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“…Many research papers have been published [4,5] on diagnostic accuracy and methods, and in April 2008 a report on diagnostic methods for transformers using FRA measurement was issued by the CIGRE WG SC A2.26 [6]. Furthermore, IEC standardization is now being evaluated, as a part of which guidelines for measurement methods and diagnostic methods are expected to be issued.…”

Section: Introductionmentioning

confidence: 99%

Influence of Measurement Parameters on Frequency Response Analysis Diagnosis of Oil‐Immersed Transformer

Sano

Miyagi

2013

Electrical Engineering Japan

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SUMMARY 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. Electr Eng Jpn, 186(1): 18–25, 2014; Published online in Wiley Online Library (http://wileyonlinelibrary.com). DOI 10.1002/eej.22313

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Section: Introductionmentioning

confidence: 99%