Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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17.5 kV開關(guān)柜雷電沖擊試驗(yàn)擊穿原因分析與優(yōu)化

來源:電工電氣發(fā)布時(shí)間:2018-12-17 10:17 瀏覽次數(shù):669
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(chǎng)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(duì)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(duì)U50 的影響,借助有限元分析尖端對(duì)電場(chǎng)場(chǎng)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(hào):TM591;TM866     文獻(xiàn)標(biāo)識(shí)碼:B     文章編號(hào):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
 
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