17.5 kV開關(guān)柜雷電沖擊試驗(yàn)擊穿原因分析與優(yōu)化
姚淮林,吳秋亮,宋淼,石維東,陸軍
(江蘇南瑞帕威爾電氣有限公司,江蘇 南京 211100)
摘 要:分析了17.5 kV開關(guān)柜在廠內(nèi)試驗(yàn)中出現(xiàn)雷電沖擊閃絡(luò)擊穿的問題及原因,得出絕緣距離不足、表面殘余電荷、電場局部集中是導(dǎo)致雷電沖擊閃絡(luò)擊穿或試驗(yàn)失敗的主要原因。針對上述問題進(jìn)行了安全距離的理論計(jì)算,探討了殘余電荷對U50 的影響,借助有限元分析尖端對電場場強(qiáng)分布的影響,并給出了相應(yīng)的改進(jìn)措施及建議,為提高產(chǎn)品雷電沖擊試驗(yàn)通過率提供參考。
關(guān)鍵詞:17.5 kV開關(guān)柜;雷電沖擊試驗(yàn);擊穿
中圖分類號:TM591;TM866 文獻(xiàn)標(biāo)識碼:B 文章編號:1007-3175(2018)12-0055-03
Breakdown Analysis and Optimization of 17.5 kV Switchgear in Lightning Impulse Test
YAO Huai-lin, WU Qiu-liang, SONG Miao, SHI Wei-dong, LU Jun
(Jiangsu Nari Power Electric Co., Ltd, Nanjing 2111 00, China)
Abstract: This paper analyzed the lighting impulse flashover breakdown problem and causes of 17.5 kV switchgear during factory test. The results showed that the insufficient insulation distance, the residual surface charge and the location concentration were the main causes responsible for the lightning impulse flashover breakdown or the test failure. Aiming at the above problems, this paper carried out the theoretical calculation of the safe distance, discussed the influence of the residual charge on the U50, analyzed the influence of the tip on the electric field intensity distribution by means of the finite element method, and gave the corresponding improvement measures and suggestions, which provides references for the improvement of products lightning impulse test pass rate.
Key words: 17.5 kV switchgear; lightning impulse test; breakdown
參考文獻(xiàn)
[1] 胡偉濤.500 kV HGIS雷電沖擊試驗(yàn)擊穿的原因分析[J]. 高壓電器,2013,49(12):145-149.
[2] 徐世山,孟可風(fēng),劉文泉. 一起363 kV GIS充電閃絡(luò)故障的原因分析[J]. 高壓電器,2007,43(1):74-76.
[3] 張智偉.40.5 kV鎧裝式金屬封閉開關(guān)柜在高海拔電網(wǎng)使用中絕緣加強(qiáng)的改造實(shí)踐[J]. 陜西電力,2008,36(3):52-56.
[4] 葉成剛.35 kV在役開關(guān)柜絕緣結(jié)構(gòu)改進(jìn)研究[D]. 上海:上海交通大學(xué),2013.
[5] 沈志恒,胡賢德,周浩,等. 開關(guān)柜的10 kV至20 kV升壓改造分析[J]. 電力自動化設(shè)備,2012,32(4):122-128.
[6] 王賽豪,史恒超,秦政敏,等.1 100 kV特高壓交流復(fù)合套管局放原因分析及改進(jìn)措施[J]. 電工電氣,2017(9):27-31.
[7] 王文端, 王景春, 于德明. 絕緣板表面殘余電荷對沿面放電的影響[J]. 華北電力學(xué)院學(xué)報(bào),1993(1):26-30.
[8] 鄧軍波,松崗成居,熊田亞紀(jì)子,等. 沖擊電壓下殘余電荷對沿面放電發(fā)展的影響[J]. 高電壓技術(shù),2012,38(8):2137-2144.