本文選題：電纜終端 + 氣隙缺陷��； 參考：《高電壓技術(shù)》2014年12期

【摘要】：為了研究氣隙缺陷導(dǎo)致電纜終端絕緣失效的機(jī)理,基于電場(chǎng)分析探討了終端氣隙的局部放電發(fā)展過程。建立了終端氣隙缺陷的有限元模型并進(jìn)行了電場(chǎng)理論計(jì)算,闡述了氣隙對(duì)終端電場(chǎng)分布的影響并分析了氣隙沿電纜軸向和徑向的電場(chǎng)強(qiáng)度特征,討論了氣隙參數(shù)與終端氣隙內(nèi)電場(chǎng)強(qiáng)度最大值之間的關(guān)系。進(jìn)而,通過實(shí)驗(yàn)終端電熱老化實(shí)驗(yàn)中的局部放電檢測(cè)發(fā)現(xiàn),運(yùn)行條件下終端氣隙缺陷放電迅速發(fā)展,在不同的老化階段表現(xiàn)出不同的放電特征。同時(shí),觀察老化前后的氣隙缺陷發(fā)現(xiàn),老化后氣隙內(nèi)的絕緣毛刺被燒蝕,通道狹長(zhǎng)平滑。結(jié)合氣隙的電場(chǎng)特征分析說(shuō)明,半導(dǎo)電層截?cái)辔恢眉械碾妶?chǎng)導(dǎo)致此處的氣隙更容易發(fā)生局部放電,而放電表現(xiàn)出的階段性差異與氣隙通道的逐漸貫穿密切相關(guān),通過簡(jiǎn)化的放電模型可以描述氣隙的放電發(fā)展機(jī)理。
[Abstract]:In order to study the mechanism of terminal insulation failure caused by air gap defect, the development process of partial discharge of terminal air gap is discussed based on electric field analysis. The finite element model of air gap defect is established and the electric field theory is calculated. The influence of air gap on terminal electric field distribution is expounded and the electric field intensity characteristics along the axial and radial direction of air gap are analyzed. The relationship between the air gap parameters and the maximum electric field intensity in the terminal air gap is discussed. Furthermore, through the partial discharge detection in the electrothermal aging experiment of the terminal, it is found that the terminal gap defect discharge develops rapidly under the condition of operation, and shows different discharge characteristics in different aging stages. At the same time, the air gap defects before and after aging were observed, the insulation burr in the air gap was ablated after aging, and the channel was long and narrow smooth. Combined with the analysis of the electric field characteristics of the air gap, it is shown that the electric field at the truncated position of the semiconductive layer leads to the partial discharge of the air gap, and the phase difference of the discharge is closely related to the gradual penetration of the air gap channel. The development mechanism of air gap discharge can be described by simplified discharge model.
【作者單位】： 四川大學(xué)電氣信息學(xué)院;國(guó)網(wǎng)寧夏電力公司電力科學(xué)研究院;
【基金】：國(guó)家自然科學(xué)基金(51477106)~~
【分類號(hào)】：TM75

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本文編號(hào)：2015685