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

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均勻直流電場(chǎng)下變壓器油中金屬微粒聚集特性研究

來(lái)源：電工電氣發(fā)布時(shí)間：2022-08-29 09:29 瀏覽次數(shù)：387

均勻直流電場(chǎng)下變壓器油中金屬微粒聚集特性研究

邱虎1，2，楊旭1，2，羅傳仙1，2，張靜1，2，文豪1，2
(1 南瑞集團(tuán)(國(guó)網(wǎng)電力科學(xué)研究院)有限公司，江蘇 南京 211106；
2 國(guó)網(wǎng)電力科學(xué)研究院武漢南瑞有限責(zé)任公司，湖北 武漢 430074)
 
    摘 要：金屬微粒在變壓器油道內(nèi)部出現(xiàn)匯聚或堆積，由于其強(qiáng)導(dǎo)電性，會(huì)大大縮短油隙的絕緣有效距離，引發(fā)局部放電甚至絕緣擊穿。利用變壓器油中金屬微粒運(yùn)動(dòng)觀測(cè)平臺(tái)試驗(yàn)裝置和高速相機(jī)捕獲不同外施電壓幅值下金屬微粒在橢圓形平板電極間的聚集過(guò)程，試驗(yàn)結(jié)果表明：當(dāng)外施電壓為 10 kV 和 20 kV 時(shí)，電極間金屬微粒濃度隨電壓施加時(shí)間逐漸降低，變壓器油中無(wú)法形成金屬微粒“小橋”，而當(dāng)電壓升高至 30 kV 后，金屬微粒“小橋”將在平板電極邊緣出現(xiàn)；對(duì)油中微粒進(jìn)行受力分析，發(fā)現(xiàn)微粒在電場(chǎng)邊緣所受電場(chǎng)梯度力可高達(dá)重力的 6 倍，微粒會(huì)在電場(chǎng)梯度力的作用下向電極邊緣運(yùn)動(dòng)，從而聚集形成金屬微粒“小橋”，最終引發(fā)絕緣擊穿。
    關(guān)鍵詞： 變壓器油；直流電壓；金屬微粒；聚集特性
    中圖分類號(hào)：TM406 ；TM855     文獻(xiàn)標(biāo)識(shí)碼：B     文章編號(hào)：1007-3175(2022)08-0058-05
 
Research on Clustering of Metal Particle Accumulation Characteristic in
Transformer Oil Under Uniform DC Electric Field
 
QIU Hu1,2, YANG Xu1,2, LUO Chuan-xian1,2, ZHANG Jing1,2, WEN Hao1,2
（1 Nanjing NARI Group Corporation(State Grid Electric Power Research Institute), Nanjing 211106, China;
2 Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute, Wuhan 430074, China）
 
    Abstract: The metal particle could gather and accumulate inside the transformer oil tunnel. It has strong conductivity and could help shorten the effective insulation distance, trigger partial discharge, and initiate insulation breakdown. This research captured the gathering process of metal particles among oval plate electrodes under various voltage amplitude of the applied voltage by using an observation platform experimental setup of the metal particle movement in the transformer oil and high-speed camera. The metal particle consistency among the electrodes decreased with application time when the applied voltage was 10 kV and 20 kV, and the metal particle bridge could not be formed in transformer oil. When the voltage is up to 30 kV, and the metal particle bridge would emerge around rim of the plate electrodes. In addition,this paper analyzed the particles in the oil. It found that the electrical gradient force on particles is six times higher than gravity. Particles would move to the electrodes under the electrical gradient force,gathering as a bridge and triggering the insulation breakdown.
    Key words: transformer oil; DC voltage; metal particle; accumulation characteristic
 
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