油浸紙?zhí)坠茈娙菪咀訕O板邊緣電場(chǎng)分布的仿真及優(yōu)化方法
發(fā)布時(shí)間：2018-05-10 08:13
本文選題：油浸紙?zhí)坠?/strong> + 電容芯子 ； 參考：《電網(wǎng)技術(shù)》2017年05期
【摘要】：在各電壓等級(jí)的電容式套管中普遍存在極板邊緣電場(chǎng)效應(yīng)。極板邊緣電場(chǎng)突變,形成局部強(qiáng)場(chǎng)區(qū),引發(fā)極板邊緣放電,對(duì)電容式套管安全運(yùn)行構(gòu)成威脅。目前常規(guī)的電容芯子設(shè)計(jì)方法中,采用電容串聯(lián)分壓模型計(jì)算電容芯子徑向電場(chǎng)及軸向電場(chǎng),但該模型僅適用計(jì)算芯子內(nèi)部平均電場(chǎng)�，F(xiàn)有的仿真計(jì)算中考慮了套管局部及整體的電場(chǎng)分布,但忽略了極板厚度及邊緣形貌,對(duì)極板邊緣的電場(chǎng)缺乏細(xì)致分析,進(jìn)而使得極板邊緣電場(chǎng)控制措施不明。利用Infolytica有限元軟件,仿真分析了油浸紙?zhí)坠茈娙菪咀訕O板邊緣不處理、極板邊緣單折邊、加半導(dǎo)體紙等3種情況下極板邊緣區(qū)域的局部場(chǎng)強(qiáng)可視化分布情況。研究結(jié)果表明,極板邊緣不處理情況下極板邊緣場(chǎng)強(qiáng)遠(yuǎn)大于極板中部均勻場(chǎng)強(qiáng),極板邊緣單折邊、敷設(shè)半導(dǎo)體紙可分別使得極板邊緣場(chǎng)強(qiáng)下降19%、33%。極板邊緣單折邊及敷設(shè)半導(dǎo)體紙的方式均可降低邊緣場(chǎng)強(qiáng)。在實(shí)際套管電容芯子設(shè)計(jì)及生產(chǎn)過(guò)程中,建議采用10~20 mm寬度的單折邊或敷設(shè)半導(dǎo)體紙改善邊緣電場(chǎng)的方法,以電場(chǎng)分布的均勻化、不增加芯子主體尺寸的方式,降低極板邊緣電場(chǎng)效應(yīng),提升套管安全運(yùn)行水平。
[Abstract]:The electrode edge electric field effect is common in capacitive bushing with different voltage levels. The abrupt change of electric field in the edge of the polar plate forms a local strong field region, which causes the edge discharge of the electrode plate and threatens the safe operation of the capacitive casing. At present, in the conventional design method of capacitive core, the capacitance series partial voltage model is used to calculate the radial and axial electric field of the capacitor core, but this model is only suitable for calculating the average electric field inside the core. The local and global electric field distribution of the casing is considered in the present simulation calculation, but the thickness and the shape of the electrode plate are ignored, and the electric field of the edge of the electrode plate is not analyzed in detail, which makes the control measures of the electric field on the edge of the electrode plate unclear. By using Infolytica finite element software, the visualization distribution of the local field intensity in the edge region of the electrode plate is simulated and analyzed under three conditions: the edge of the capacitor core of oil-immersed paper casing is not treated, the edge of the electrode plate is single folded, and the edge of the plate is added with semiconductor paper. The results show that the field strength of the edge of the polar plate is much larger than that of the uniform field in the middle of the plate when the edge of the plate is not treated, and the electric field strength of the edge of the plate can be reduced by 19% and 33% respectively by laying the semiconductor paper on the edge of the plate. The edge field strength can be reduced by the single fold edge of the plate edge and the way of laying the semiconductor paper. In the design and production process of practical casing capacitor core, it is suggested to improve the edge electric field by single fold or laying semiconductor paper with a width of 10 ~ 20 mm, so as to homogenize the electric field distribution without increasing the main size of the core. Reduce the electric field effect on the edge of the pole plate and improve the safe operation level of the casing.
【作者單位】： 新能源電力系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));南方電網(wǎng)科學(xué)研究院有限責(zé)任公司;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)(2015AA050204) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金資助(2016XS03) 中國(guó)南方電網(wǎng)公司2014年科技項(xiàng)目(K-KY2014-002)~~
【分類(lèi)號(hào)】：TM41
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