油入変圧器の周波数応答分析診断に関する測定パラメータの影響

概要

論文の詳細を見る
Appropriate monitoring and maintenance become important as the oil-immersed transformer ages. Generally DGA (Dissolved Gas Analysis) is effective for the on-line diagnosis, and if abnormality is detected, FRA (Frequency Response Analysis) is effective for the off-line diagnosis to localize the failed part. FRA diagnosis detects the 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 to influence FRA characteristics. It was confirmed that the measurement parameters examined here greatly influence 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.
2011-10-01