本文選題：油紙絕緣　切入點(diǎn)：極化去極化電流　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：變壓器的油紙絕緣系統(tǒng)在電磁場(chǎng)、高溫、機(jī)械應(yīng)力和水分等多種因素的協(xié)同作用下逐漸老化,導(dǎo)致變壓器的電氣和機(jī)械絕緣性能隨同劣化,所以油紙絕緣系統(tǒng)性能的優(yōu)劣決定了變壓器的使用壽命。水分作為油紙絕緣老化的產(chǎn)物和催化劑,是加速油紙絕緣系統(tǒng)老化的一個(gè)關(guān)鍵因素,因此準(zhǔn)確地評(píng)估油紙絕緣系統(tǒng)的水分含量具有十分重要的學(xué)術(shù)意義�，F(xiàn)有研究主要是定性分析時(shí)域介電譜與油紙絕緣老化狀態(tài)之間的相關(guān)關(guān)系,如何采取有效的方式提取出特征量,定量評(píng)估油紙絕緣老化程度和水分含量,特別是不受變壓器的幾何尺寸影響的特征量一直是該領(lǐng)域的研究難點(diǎn),因此針對(duì)這些問題進(jìn)行進(jìn)一步研究具有重要的實(shí)際意義。本文在實(shí)驗(yàn)室條件下對(duì)不同老化程度和水分含量的油浸絕緣紙?jiān)嚇舆M(jìn)行PDC測(cè)試,分析了上述條件對(duì)極化去極化電流曲線的影響,基于擴(kuò)展Debye模型和傳遞函數(shù)分析法分別提取了評(píng)估老化程度和水分含量的時(shí)域介電特征量。研究結(jié)果表明:低水分含量條件下,大時(shí)間常數(shù)極點(diǎn)對(duì)油浸絕緣紙聚合度十分敏感,能夠定量評(píng)估絕緣紙的老化程度;對(duì)系統(tǒng)極點(diǎn)進(jìn)行有效信息融合,提取出的優(yōu)化特征量避免了極點(diǎn)的選取方式給評(píng)估準(zhǔn)確性帶來的影響,在定量評(píng)估絕緣紙板老化程度時(shí)具有更高準(zhǔn)確性,并且,此特征量與絕緣紙板的尺寸大小和幾何結(jié)構(gòu)無關(guān);傳遞函數(shù)零點(diǎn)對(duì)絕緣紙水分含量十分敏感,其中臨界零點(diǎn)包含的絕緣紙水分含量信息最為全面且干擾信息最少,表征絕緣紙水分含量效果最好,對(duì)各零點(diǎn)進(jìn)行有效信息融合提取出的優(yōu)化特征量在評(píng)估絕緣紙水分含量時(shí)具有更高的準(zhǔn)確性,并且,此特征參量也與絕緣紙板的幾何尺寸無關(guān)。通過不均勻加速熱老化實(shí)驗(yàn),分析了實(shí)際不均勻老化條件對(duì)表征老化程度和水分含量的時(shí)域介電特征量評(píng)估效果的影響。試驗(yàn)結(jié)果表明:不均勻熱老化試樣的修正Debye模型和擴(kuò)展Debye模型參數(shù)間差別非常小,可以用擴(kuò)展Debye模型對(duì)不均勻老化的絕緣紙進(jìn)行描述;任一層絕緣紙的聚合度皆不能作為衡量不均勻老化絕緣紙老化程度的指標(biāo),但是中間層絕緣紙聚合度與所提特征量相關(guān)關(guān)系最好,可以期待有一個(gè)能夠衡量不均勻老化絕緣系統(tǒng)老化程度的綜合聚合度與所提的極點(diǎn)特征量之間存在定量關(guān)系·,在絕緣紙不均勻老化一定時(shí)間后,提取的時(shí)域介電特征量與絕緣紙水分含量之間依然存在較好的函數(shù)關(guān)系,其評(píng)估準(zhǔn)確性受到不均勻老化的影響非常小,即不均勻熱老化情況下,提出的時(shí)域介電特征量依然對(duì)絕緣紙水分含量十分敏感,因此,此特征量更加適合用于現(xiàn)場(chǎng)服役變壓器的絕緣系統(tǒng)老化狀態(tài)評(píng)估。
[Abstract]:The oil-paper insulation system of the transformer is aging gradually under the synergistic action of electromagnetic field, high temperature, mechanical stress and moisture, which leads to the deterioration of the electrical and mechanical insulation performance of the transformer. Therefore, the performance of oil-paper insulation system determines the service life of transformer. Water, as the product and catalyst of oil-paper insulation aging, is a key factor to accelerate the aging of oil-paper insulation system. Therefore, it is of great academic significance to accurately evaluate the moisture content of oil-paper insulation system. The existing studies mainly focus on the qualitative analysis of the correlation between the time-domain dielectric spectrum and the aging state of oil-paper insulation. How to extract the characteristic quantity in an effective way and evaluate quantitatively the aging degree and moisture content of oil-paper insulation, especially the characteristic quantity which is not affected by the geometric size of transformer, has been the research difficulty in this field. Therefore, it is of great practical significance to further study these problems. In this paper, the samples of oil-immersed insulator paper with different aging degree and moisture content are tested by PDC under laboratory conditions. The influence of the above conditions on the polarization depolarization current curve was analyzed. Based on the extended Debye model and the transfer function analysis method, the time domain dielectric characteristics were extracted to evaluate the aging degree and the moisture content, respectively. Large time constant poles are very sensitive to the degree of polymerization of oil-immersed insulator paper and can be used to quantitatively evaluate the aging degree of insulator paper. The extracted optimization features avoid the influence of the selection of poles on the accuracy of the evaluation, and have higher accuracy in quantitative evaluation of the aging degree of insulating paperboard. This characteristic quantity has nothing to do with the size and geometric structure of insulating paperboard, and the transfer function 00:00 is very sensitive to the moisture content of insulator paper, among which critical 00:00 contains the most comprehensive information and the least interference information. The water content of insulator paper is the best, and the optimized characteristic quantity extracted by effective information fusion at 00:00 has higher accuracy in evaluating the moisture content of insulator paper. This characteristic parameter is also independent of the geometric size of insulating paperboard. The effect of the actual non-uniform aging conditions on the evaluation effect of the time-domain dielectric characteristic of the aging degree and moisture content is analyzed. The experimental results show that there is very little difference between the parameters of the modified Debye model and the extended Debye model of the non-uniform thermal aging sample, and the difference between the parameters of the modified Debye model and the extended Debye model is very small. The extended Debye model can be used to describe the nonuniform aging insulator paper, and the degree of polymerization of any layer of insulator paper can not be used as an index to measure the aging degree of inhomogeneous aging insulator paper. However, the degree of polymerization of the intermediate layer insulator paper has the best correlation with the proposed characteristic quantity. It can be expected that there is a quantitative relationship between the degree of synthesis polymerization that can measure the aging degree of the inhomogeneous aging insulation system and the pole characteristic quantity proposed. After a certain period of inhomogeneous aging of the insulator paper, There is still a good functional relationship between the time domain dielectric characteristic and the moisture content of the insulator paper, and the accuracy of the estimation is very little affected by the inhomogeneous aging, that is, under the condition of non-uniform thermal aging. The time domain dielectric characteristic is still very sensitive to the moisture content of insulator paper, so it is more suitable for evaluating the aging state of insulation system of transformer in service in the field.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM855

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