本文選題：換流變壓器 + 油紙絕緣��； 參考：《高電壓技術(shù)》2014年01期

【摘要】：換流變壓器閥側(cè)繞組同時(shí)承受交流、直流電壓作用,其內(nèi)部油紙復(fù)合絕緣局部放電性故障與以往交流電力變壓器存在較大差別,而相關(guān)研究明顯不足。為研究油紙絕緣直流局部放電發(fā)展過程與絕緣材料理化特性變化規(guī)律之間的關(guān)系,對(duì)典型油紙絕緣缺陷模型在80℃環(huán)境中進(jìn)行了200 h直流耐壓試驗(yàn),考察油紙絕緣直流局部放電發(fā)展不同階段統(tǒng)計(jì)特征譜圖變化規(guī)律,并利用高速攝像裝置對(duì)油紙絕緣針板電極模型的局部放電發(fā)生、發(fā)展及擊穿的動(dòng)態(tài)過程進(jìn)行觀測(cè)。同時(shí),為揭示直流局部放電對(duì)油紙絕緣的破壞作用,分別通過X射線能量色散譜分析(EDS)、傅里葉變換紅外光譜分析(FTIR)研究直流局部放電相應(yīng)階段油紙絕緣的理化特征變化規(guī)律。試驗(yàn)結(jié)果表明:根據(jù)油紙絕緣直流局部放電脈沖的統(tǒng)計(jì)特征譜圖,將其發(fā)展過程劃分為5個(gè)階段,此過程中伴隨著絕緣紙板表面纖維氧元素的增加和羰基含量、油中酸值增加的過程,說明直流電應(yīng)力對(duì)絕緣紙板的破壞作用主要表現(xiàn)在使絕緣紙板表面纖維素分子發(fā)生氧化反應(yīng),導(dǎo)致絕緣紙板的絕緣性能的逐漸下降,反之,絕緣材料在直流電應(yīng)力作用下發(fā)生損傷,會(huì)促進(jìn)直流局部放電的發(fā)生程度加劇。
[Abstract]:The valve winding of converter transformer is subjected to AC and DC voltage at the same time, and its internal oil-paper composite insulation partial discharge fault is quite different from the former AC power transformer, but the related research is obviously insufficient.In order to study the relationship between the development process of DC partial discharge of oil-paper insulation and the change rule of physical and chemical properties of insulating materials, a 200h DC voltage withstand test was carried out on the typical oil-paper insulation defect model at 80 鈩，

本文編號(hào)：1744455