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          • [1]李俊豪,吳小钊,白維正,等.40.5 kV大電流固封極柱絕緣結構電場分析及優化設計[J].高壓電器,2019,55(07):87-92.[doi:10.13296/j.1001-1609.hva.2019.07.013 ]
             LI Junhao,WU Xiaozhao,BAI Weizheng,et al.Electric Field Analysis and Optimization Design of Insulation Structure for 40.5 kV Large Current Solid-insulation-embedded Pole[J].High Voltage Apparatus,2019,55(07):87-92.[doi:10.13296/j.1001-1609.hva.2019.07.013 ]
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            40.5 kV大電流固封極柱絕緣結構電場分析及優化設計()
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            《高壓電器》[ISSN:1001-1609/CN:61-11271/TM]

            卷:
            第55卷
            期數:
            2019年07期
            頁碼:
            87-92
            欄目:
            研究與分析
            出版日期:
            2019-07-31

            文章信息/Info

            Title:
            Electric Field Analysis and Optimization Design of Insulation Structure for 40.5 kV Large Current Solid-insulation-embedded Pole
            作者:
            李俊豪 12 吳小钊 12 白維正12 李長鵬12 李 猛12 湯清雙12
            (1. 許繼集團有限公司, 河南 許昌 461000; 2. 許昌許繼德理施爾電氣有限公司, 河南 許昌 461000)
            Author(s):
            LI Junhao12 WU Xiaozhao12 BAI Weizheng12 LI Changpeng12 LI Meng12 TANG Qingshuang12
            (1. XJ Group Corporation, Henan Xuchang 461000, China; 2. Xuchang XJ-Driescher Wegberg Electric Co., Ltd., Henan Xuchang 461000, China)
            關鍵詞:
            固封極柱 複合絕緣 局部放電 沿面放電 電場分析 絕緣試驗 優化設計
            Keywords:
            solid-insulation-embedded pole composite insulationpartial dischargesurface discharge electric field analysis insulation test optimization design
            DOI:
            10.13296/j.1001-1609.hva.2019.07.013
            摘要:
            大電流固封極柱必須大量采用軟連接,容易造成局放超標及沿面放電,因而對其進行絕緣結構分析及優化設計件具有重要意義。文中運用有限元分析方法得出了40.5 kV大電流固封極柱的電場分布雲圖,並提取分布較爲集中的軟連接及固定螺栓周圍氣體域的電場分布,指出軟連接附近SF6氣體中電場畸變,造成局放過大及沿面放電。依據複合絕緣電場理論,提出了在軟連接周邊固封極柱腔體內澆築屏蔽網,並使屏蔽網與軟連接等電位的優化方法。通過電場分析,優化後的軟連接固定螺栓附近SF6氣體電場強度由12 kV/mm降低爲7.5 kV/mm,驗證了優化設計方法理論上的可行性。局放試驗結果表明,優化後的固封極柱局放量由203.98 pC降低到2.37 pC,雷電沖擊試驗峰值耐受電壓由優化前的162 kV提升到215 kV,證明了提出的優化方案具備工程應用可行性,爲大電流固封極柱結構設計及高壓電器實際工程中氣固複合絕緣電場的優化提供了有關參考。
            Abstract:
            Large current solid-insulation-embedded poles must use soft connection. It causes partial discharge and surface discharge. So it is of great significance for the analysis and optimization design of insulation structure. The electric field distribution of 40.5 kV embedded pole is obtained by using the finite element analysis method, and the electric field concentration area’s distribution of the gas domain nearby bolts and soft connection is extracted. It is obvious that the electric field distortion of SF6 near soft connection, resulting in larger partial discharge and surface discharge. According to composite insulation electric field theory, an optimization method is proposed to cast shielding net around the soft connection in solid-insulation-embedded pole, and made shielding net and soft connection equipotential. Through electric analysis, the maximum field strength of the SF6 gas near bolt decreased from 12 kV/mm to 7.5 kV/mm, which confirmed the theoretical feasibility of the optimization design. Partial discharge tests show that the optimized embedded pole’s magnitude of partial discharge decreased from 203.98 pC to 2.37 pC. Peak withstand voltage of lightning impulse test increased from162 kV to 215 kV, It confirmed the feasibility of the optimization measures in engineering applications, which provided reference for optimization design of large-current solid-insulation-embedded pole and high voltage apparatus composite insulation electric field.

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            備注/Memo

            備注/Memo:
            收稿日期:2018-12-05; 修回日期:2019-01-29李俊豪(1987—),男,碩士,工程師,主要從事高壓電器及電磁場數值仿真分析技術研究。 吳小钊(1979—),男,碩士,工程師,長期從事于中壓開關設計開發工作。
            更新日期/Last Update: 2019-07-15