電気学会論文誌A(基礎・材料・共通部門誌)
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
論文
モールド変圧器のインピーダンス周波数特性の解明と部分放電診断手法への適用
柿本 康朝小迫 雅裕匹田 政幸飯田 和生梅村 時博中村 勇介中前 哲夫前田 照彦尾崎 多文
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2021 年 141 巻 7 号 p. 420-427

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It is desired to establish an insulation diagnosis method for cast resin transformers (CRTr), which is often used in distribution systems. Partial discharge (PD) detection is considered to be an effective method, but its phenomenon has not yet been clarified. This paper presents investigation on the frequency characteristics of PD generated inside CRTr to improve PD detection technology. It is clarified that dominant frequency of PD signal detected by a high frequency CT depends on the frequency characteristics of the impedance between the primary and secondary windings. It is suggested that the dominant frequency could be predicted in advance by analysis using a high-frequency equivalent circuit model of CRTr. PD diagnostic technology that utilizes the frequency characteristics of the CRTr impedance has also been proposed. It is found that a PD generated external to CRTr does not have resonance at the dominant frequency of the CRTr itself, even though it passes through the CRTr. In conclusion, it is suggested that the frequency analysis of CRTr impedance could identify degraded CRTr and external noise.

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