Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies - Details

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Abstract：

Electrical　tree　degradation　is　one　of　the　main　causes　of　insulation　failure　in　high-frequency　transformers.　Electrical　tree　degradation　is　studied　on　pure　epoxy　resin　(EP)　and　MgO/EP　composites　at　frequencies　ranging　from　50 Hz　to　130 kHz.　The　results　show　that　the　tree　initiation　voltage　of　EP　decreases,　while　the　growth　rate　and　the　expansion　coefficient　increase　with　frequency.　Moreover,　the　bubble　phenomenon　at　high　frequencies　in　EP　composites　is　discussed.　Combined　with　trap　distribution　characteristics　within　the　material,　the　intrinsic　mechanism　of　epoxy　composites　to　inhibit　the　growth　of　the　electrical　tree　at　different　frequencies　is　discussed.　It　can　be　concluded　that　more　deep　traps　and　blocking　effect　are　introduced　by　doping　nano-MgO　into　EP　bulks,　which　can　improve　the　electrical　tree　resistance　performance　of　EP　composites　in　a　wide　frequency　range.　©　2024　The　Authors.　High　Voltage　published　by　John　Wiley　&　Sons　Ltd　on　behalf　of　The　Institution　of　Engineering　and　Technology　and　China　Electric　Power　Research　Institute.

Keyword：

Electric power distribution Epoxy resins High frequency transformers Magnesia

Community：

[ 1 ] [Zhang, Yunxiao]College of Electrical Engineering and Automation, Fuzhou University, Fujian Key Laboratory of New Energy Generation and Power Conversion, Fuzhou, China
[ 2 ] [Zhang, Yunxiao]State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, China
[ 3 ] [Lin, Wenxin]College of Electrical Engineering and Automation, Fuzhou University, Fujian Key Laboratory of New Energy Generation and Power Conversion, Fuzhou, China
[ 4 ] [Zhou, Yuanxiang]State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, China
[ 5 ] [Xing, Weiwei]State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, China
[ 6 ] [Cheng, Jiayu]State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, China
[ 7 ] [Teng, Chenyuan]State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, China

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Source ：

High Voltage

Year： 2024

Issue： 3

Volume： 9

Page： 581-590

4 . 4 0 0

JCR@2023

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SCOPUS Cited Count： 2

ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 0

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