エネルギー解放率に基づく電気絶縁材料劣化の駆動力推定

木谷, 亮太; 岩田, 晋弥; 今谷, 勝次

doi:https://doi.org/10.18910/93518

エネルギー解放率に基づく電気絶縁材料劣化の駆動力推定

木谷, 亮太; 岩田, 晋弥; 今谷, 勝次

電気材料技術雑誌, 2023, 32(1), 9-17

アクセス数:440件（2026-07-14 22:49 集計）

固定URL: https://doi.org/10.18910/93518

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タイトル	エネルギー解放率に基づく電気絶縁材料劣化の駆動力推定
	Estimating driving-force of electrical deterioration of insulators based on energy-release rate
	エネルギー　カイホウリツ　ニ　モトヅク　デンキ　ゼツエン　ザイリョウ　レッカ　ノ　クドウリョク　スイテイ
著者	NRID 1000090761619 1000090761619 著者名木谷, 亮太 ; キタニ, リョウタ ; Kitani, Ryota
	NRID 1000010642382 1000010642382 著者名岩田, 晋弥 ; イワタ, シンヤ ; Iwata, Shinya
	NRID 1000070191898 1000070191898 著者名今谷, 勝次 ; イマタニ, ショウジ ; Imatani, Shoji
キーワード等	電気絶縁材料
	エネルギー解放率
	有限要素解析
	電気トリー
内容	論文
抄録	Detailed analyses of mechanisms of electrical treeing phenomenon have been carried out yet. In this study, we analyze electrical trees as very thin 3D tubes between a treeing needle and a plate electrode and calculate the energyrelease rate to estimate and evaluate the driving force required for crack propagation. This study implements a new method applying an analogy between concepts of fracture mechanics and Maxwell stress to calculate the energyrelease rate in a 3D model. As a result, we obtained the energy-release rate around a volume near the needle-electrode and electrical trees. In addition, path independence is verified, and it is found to be conserved only when the path does not include the interface between the needle-electrode and the insulation material. Then, the values of energyrelease rate obtained in each condition of tree length and applied voltage were compared, respectively. It is revealed that the 1D-growth of the tree has a small effect on the value of the energy-release rate, and that the value is proportional to the square of applied voltage on the needle-electrode. These results imply that calculating energyrelease rate exhibits a potential to mathematically evaluate the growth of electrical trees, connecting its results to experimental results such as partial discharge phenomenon and/or space charge accumulation.
出版者	電気材料技術懇談会
収録物名	電気材料技術雑誌
収録物名	Journal of the Society of Electrical Materials Engineering
巻(号)	32(1)
ページ	9-17
刊行年月	2023-12-25
言語	日本語
ハンドルURL	https://hdl.handle.net/11094/93518
DOI	https://doi.org/10.18910/93518
PISSN	09189890
NCID	AN10426571
アクセス権	open access
出版タイプ	Version of Record
カテゴリ	本学関連学会 Related Societies
カテゴリ	電気材料技術雑誌 / 第32巻

資源タイプ	学術雑誌論文
ローカル資源タイプ	本学関連学会
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	電気材料技術雑誌. 2023, 32(1), p. 9-17
DC.title	エネルギー解放率に基づく電気絶縁材料劣化の駆動力推定
	Estimating driving-force of electrical deterioration of insulators based on energy-release rate
	エネルギー　カイホウリツ　ニ　モトヅク　デンキ　ゼツエン　ザイリョウ　レッカ　ノ　クドウリョク　スイテイ
DC.creator	木谷, 亮太
	キタニ, リョウタ
	Kitani, Ryota
	岩田, 晋弥
	イワタ, シンヤ
	Iwata, Shinya
	今谷, 勝次
	イマタニ, ショウジ
	Imatani, Shoji
DC.publisher	電気材料技術懇談会
DC.language' scheme='DCTERMS.RFC1766	日本語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2023-12-25
DC.subject	電気絶縁材料
	エネルギー解放率
	有限要素解析
	電気トリー
DC.description	論文
DCTERMS.abstract	Detailed analyses of mechanisms of electrical treeing phenomenon have been carried out yet. In this study, we analyze electrical trees as very thin 3D tubes between a treeing needle and a plate electrode and calculate the energyrelease rate to estimate and evaluate the driving force required for crack propagation. This study implements a new method applying an analogy between concepts of fracture mechanics and Maxwell stress to calculate the energyrelease rate in a 3D model. As a result, we obtained the energy-release rate around a volume near the needle-electrode and electrical trees. In addition, path independence is verified, and it is found to be conserved only when the path does not include the interface between the needle-electrode and the insulation material. Then, the values of energyrelease rate obtained in each condition of tree length and applied voltage were compared, respectively. It is revealed that the 1D-growth of the tree has a small effect on the value of the energy-release rate, and that the value is proportional to the square of applied voltage on the needle-electrode. These results imply that calculating energyrelease rate exhibits a potential to mathematically evaluate the growth of electrical trees, connecting its results to experimental results such as partial discharge phenomenon and/or space charge accumulation.
DC.identifier	10.18910/93518
DC.format	93518
citation_title	エネルギー解放率に基づく電気絶縁材料劣化の駆動力推定
citation_author	木谷, 亮太
	岩田, 晋弥
	今谷, 勝次
citation_publisher	電気材料技術懇談会
citation_language	日本語
citation_date	2023-12-25
citation_journal_title	電気材料技術雑誌
citation_volume	32
citation_issue	1
citation_firstpage	9
citation_lastpage	17
citation_public_url	https://hdl.handle.net/11094/93518
citation_doi_detail	10.18910/93518
citation_doi	https://doi.org/10.18910/93518

エネルギー解放率に基づく電気絶縁材料劣化の駆動力推定

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