本文選題：油紙絕緣 + 特征量��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：變壓器油紙絕緣系統(tǒng)在熱應(yīng)力、機(jī)械應(yīng)力及電場(chǎng)應(yīng)力等因素作用下,其絕緣性能逐漸劣化。老化的絕緣油可以通過濾油、換新油操作使其理化性能得到改善,而絕緣紙/紙板更換難度較大,因此,變壓器固體絕緣的老化狀態(tài)是決定變壓器剩余壽命的關(guān)鍵。水分既是老化產(chǎn)物又會(huì)加速油紙絕緣老化,如何有效區(qū)分老化和水分對(duì)頻域介電譜的影響,及針對(duì)老化和水分共存的情況下,如何采取有效的方法分別評(píng)估油紙絕緣的老化程度和水分含量,是頻域介電響應(yīng)法更好地應(yīng)用于現(xiàn)場(chǎng)變壓器油紙絕緣狀態(tài)評(píng)估的關(guān)鍵。本文在實(shí)驗(yàn)室內(nèi)通過加速熱老化試驗(yàn)和吸潮試驗(yàn)制作了不同老化程度下含水量各不相同的油浸絕緣紙?jiān)嚻?測(cè)試了不同狀態(tài)試品的介損因數(shù)頻域譜。研究表明在絕緣紙含水量較低時(shí),可以通過影響頻段的差異區(qū)分水分和老化對(duì)頻域介電譜的影響。在受水分影響的特征頻段內(nèi)提取了介損因數(shù)對(duì)頻率的積分值作為表征絕緣紙含水量的特征量,并建立了特征量與試品含水量之間的定量關(guān)系;提取了在低水分含量下有效表征油浸絕緣紙老化程度的特征量,并建立了低水分含量下特征量與試品老化程度之間的量化關(guān)系,并基于"水分補(bǔ)償因子"針對(duì)高水分含量時(shí)水分對(duì)老化評(píng)估的影響進(jìn)行了量化分析,最后結(jié)合"水分補(bǔ)償因子"與DP及Km.c之間的擬合關(guān)系式,推導(dǎo)了考慮水分影響的油浸絕緣紙老化程度定量評(píng)估方法。針對(duì)老化和水分對(duì)頻域介電譜的影響不易區(qū)分,頻域介電譜與油浸絕緣紙老化程度、含水量之間的映射關(guān)系復(fù)雜,及提取表征水分、老化的特征量較為困難等問題,在實(shí)驗(yàn)條件下對(duì)不同老化程度下含水量各不相同的試品數(shù)量進(jìn)行了擴(kuò)充,測(cè)試了試品的介損因數(shù)頻域譜與阻抗相位頻域譜。通過構(gòu)造多輸出支持向量回歸算法挖掘試品的含水量、老化程度與頻域介電譜之間的復(fù)雜映射關(guān)系,然后利用其泛化能力預(yù)測(cè)油紙絕緣的水分含量和老化程度。結(jié)合自組織神經(jīng)網(wǎng)絡(luò)聚類分析結(jié)果,表明多輸出支持向量回歸算法在紙中含水量低于3%時(shí),對(duì)油浸絕緣紙的含水量與老化程度能有效預(yù)測(cè)。介紹了現(xiàn)場(chǎng)變壓器FDS測(cè)試的接線方式,通過X-Y模型將現(xiàn)場(chǎng)測(cè)得的變壓器主絕緣結(jié)構(gòu)的FDS頻域譜進(jìn)行換算得到絕緣紙板的FDS頻譜曲線,并借助"頻溫平移"原理將測(cè)試溫度下的FDS頻譜曲線平移到參考溫度下,以消除溫度對(duì)測(cè)試結(jié)果的影響。建立了介損積分特征量法與多輸出支持向量回歸方法用于現(xiàn)場(chǎng)變壓器固體絕緣狀態(tài)評(píng)估的流程。最后,通過兩臺(tái)停運(yùn)待檢修的變壓器FDS測(cè)試結(jié)果,驗(yàn)證了介損積分特征量法和多輸出支持向量回歸方法對(duì)現(xiàn)場(chǎng)變壓器固體絕緣狀態(tài)評(píng)估的有效性。
[Abstract]:Under the influence of thermal stress, mechanical stress and electric field stress, the insulation performance of oil-paper insulation system of transformer is deteriorating gradually. The physical and chemical properties of the aged insulating oil can be improved by the operation of oil filter and the replacement of new oil, but the replacement of insulator paper / paperboard is difficult. Therefore, the aging state of transformer solid insulation is the key to determine the residual life of transformer. Moisture is both a product of aging and an accelerated ageing of oil-paper insulation. How to effectively distinguish the effects of aging and moisture on dielectric spectrum in frequency domain, and aim at the coexistence of aging and moisture. How to use effective methods to evaluate the aging degree and moisture content of oil-paper insulation respectively is the key to the better application of frequency-domain dielectric response method to the evaluation of oil-paper insulation in field transformer. In this paper, through accelerated thermal aging test and hygroscopic test in laboratory, oil-immersed insulator paper samples with different water content under different aging degree were made, and the dielectric loss factor frequency spectrum of different state samples was measured. The results show that when the water content of insulator paper is low, the influence of moisture and aging on the dielectric spectrum in frequency domain can be distinguished by the difference of influence frequency band. The integral value of dielectric loss factor to frequency is extracted as the characteristic quantity of water content of insulator paper in the characteristic frequency band affected by moisture, and the quantitative relationship between characteristic quantity and water content of the sample is established. The characteristic quantity of the aging degree of oil-immersed insulator paper under low moisture content was extracted, and the quantitative relationship between the characteristic quantity and the aging degree of the sample was established under the condition of low moisture content. Based on the "moisture compensation factor", the effect of water on aging assessment is analyzed quantitatively. Finally, the fitting relationship between "water compensation factor", DP and Km.c is given. The quantitative evaluation method of aging degree of oil-immersed insulator paper considering the effect of moisture was deduced. It is difficult to distinguish the influence of aging and moisture on the frequency domain dielectric spectrum, the aging degree of frequency domain dielectric spectrum and oil impregnated insulator paper, the mapping relationship between water content, and the difficulty of extracting and characterizing moisture, and the characteristic quantity of aging, etc. Under the experimental conditions, the number of samples with different water content under different aging degree was expanded, and the dielectric loss factor frequency spectrum and impedance phase frequency domain spectrum were tested. By constructing multi-output support vector regression algorithm, the complex mapping relationship between moisture content, aging degree and dielectric spectrum in frequency domain is mined, and then its generalization ability is used to predict moisture content and aging degree of oil-paper insulation. Combined with the results of clustering analysis of self-organizing neural networks, it is shown that the multi-output support vector regression algorithm can effectively predict the moisture content and aging degree of oil-immersed insulator paper when the water content in paper is lower than 3. The connection mode of field transformer FDS test is introduced. The FDS spectrum curve of insulation paperboard is obtained by converting the FDS frequency domain spectrum of the main insulation structure of transformer measured in the field by X-Y model. Based on the principle of "frequency temperature translation", the FDS spectrum curve at the test temperature is shifted to the reference temperature to eliminate the influence of temperature on the test results. The method of dielectric loss integral eigenvalue and multi-output support vector regression are used to evaluate the solid insulation state of field transformers. Finally, through the FDS test results of two outage transformers to be overhauled, the effectiveness of the dielectric loss integral eigenvalue method and the multi-output support vector regression method for the evaluation of the solid insulation state of the field transformers is verified.
【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

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 金福寶;周遠(yuǎn)翔;黃猛;黃建文;王明淵;;老化對(duì)交直流復(fù)合電場(chǎng)下油紙絕緣沿面放電過程特性的影響[J];高電壓技術(shù);2015年12期

2 吳廣寧;鐘鑫;包健康;;溫度對(duì)油紙絕緣介電頻譜特性的影響[J];高電壓技術(shù);2015年12期

3 董明;劉媛;任明;吳雪舟;程渙超;李金忠;;油紙絕緣頻域介電譜解釋方法研究[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年04期

4 楊麗君;齊超亮;呂彥冬;廖瑞金;高竣;史江凌;;變壓器油紙絕緣狀態(tài)的頻域介電譜特征參量及評(píng)估方法[J];電工技術(shù)學(xué)報(bào);2015年01期

5 董明;劉媛;任明;吳雪舟;李金忠;程渙超;;水分含量與分布對(duì)油紙絕緣頻域介電譜影響的有限元仿真與研究[J];高電壓技術(shù);2014年11期

6 周利軍;李先浪;段宗超;王曉劍;高波;吳廣寧;;纖維素老化對(duì)油紙絕緣水分?jǐn)U散特性的影響機(jī)制[J];中國(guó)電機(jī)工程學(xué)報(bào);2014年21期

7 周利軍;李先浪;王曉劍;崔運(yùn)光;何常新;段宗超;吳廣寧;;基于回復(fù)電壓曲線的油紙絕緣狀態(tài)評(píng)估[J];高電壓技術(shù);2014年02期

8 楊雁;楊麗君;徐積全;吳高林;徐瑞林;郝建;;用于評(píng)估油紙絕緣熱老化狀態(tài)的極化/去極化電流特征參量[J];高電壓技術(shù);2013年02期

9 劉君;吳廣寧;周利軍;羅楊;黃曉峰;;變壓器油紙絕緣微水?dāng)U散暫態(tài)的電介質(zhì)頻率響應(yīng)[J];中國(guó)電機(jī)工程學(xué)報(bào);2013年01期

10 許淵;劉有為;王文煥;弓艷朋;鄧彥國(guó);陳小軍;;大型電力變壓器油紙絕緣含水量的介質(zhì)響應(yīng)診斷技術(shù)[J];中國(guó)電機(jī)工程學(xué)報(bào);2012年33期

，

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