【摘要】：由于干式變壓器具有無污染及維護(hù)成本低等特點(diǎn),隨著社會(huì)經(jīng)濟(jì)的快速發(fā)展,干式變壓器越來越受用戶的歡迎。在社會(huì)具大的需求下,干式變壓器電壓等級(jí)的提高,絕緣擊穿越來越被各廠家所重視,如何控制干式變壓器運(yùn)行時(shí)絕緣不被擊穿,已成為一個(gè)十分重要的課題。干式變壓器由鐵心、繞組及引線三大部件組成,本論文系統(tǒng)分析了干式變壓器絕緣分類、絕緣特性及放電類型。撐握了三大部件的絕緣關(guān)系及繞組內(nèi)部絕緣結(jié)構(gòu),得出主絕緣的絕緣介質(zhì)主要是空氣,縱絕緣的絕緣介質(zhì)主要是樹脂。采用絕緣試驗(yàn)方法(工頻耐壓試驗(yàn)、感應(yīng)耐壓試驗(yàn)和局部放電試驗(yàn))來考核干式變壓器內(nèi)外部絕緣性能,找出變壓器絕緣薄弱位置。通過變壓器各部位的耐受電場(chǎng)強(qiáng)度要求,計(jì)算出各部位的絕緣距離,結(jié)合絕緣試驗(yàn)結(jié)果,進(jìn)一步提高絕緣距離,主要是為了降低各部位的場(chǎng)強(qiáng)。對(duì)于干式變壓器制造過程中加強(qiáng)工藝控制,消除導(dǎo)線毛刺、繞組開裂及繞組內(nèi)部有氣泡,可以有效提高絕緣性能。通過對(duì)干式變壓器的絕緣擊穿機(jī)理分析和采取相應(yīng)有效措施(降低各部位的場(chǎng)強(qiáng),制造工藝進(jìn)行加強(qiáng)),通過三個(gè)絕緣擊穿實(shí)例驗(yàn)證,采取相應(yīng)的措施非常有效的提高了干式變壓器絕緣性能。根據(jù)以上措施制造的變壓器可以在實(shí)際環(huán)境中可靠的運(yùn)行。
[Abstract]:With the rapid development of social economy, dry transformers are becoming more and more popular with users because of their characteristics of non-pollution and low maintenance cost. Under the great demand of the society, the improvement of the voltage grade of dry-type transformer and the insulation breakdown are paid more and more attention by the manufacturers. How to control the insulation of the dry-type transformer without breakdown has become a very important subject. Dry type transformer is composed of iron core winding and lead wire. The insulation classification insulation characteristics and discharge type of dry transformer are systematically analyzed in this paper. The insulation relationship of the three components and the internal insulation structure of the windings are held. It is concluded that the main insulation medium is air and the longitudinal insulating medium is resin. Insulation test methods (power frequency voltage test induction voltage test and partial discharge test) are used to test the internal and external insulation performance of dry type transformer and to find out the weak position of transformer insulation. According to the requirement of electric field strength of different parts of transformer, the insulation distance of each part is calculated, and the insulation distance is further increased with the result of insulation test, mainly in order to reduce the field strength of each part. The insulation performance can be improved effectively by strengthening the process control, eliminating wire burr, winding cracking and air bubbles in the dry transformer manufacturing process. By analyzing the insulation breakdown mechanism of dry-type transformer and taking corresponding effective measures (reducing the field strength of various parts and strengthening the manufacturing process), three examples of insulation breakdown are given. The corresponding measures are taken to improve the insulation performance of dry transformer. The transformers manufactured according to the above measures can operate reliably in the actual environment.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM412

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本文編號(hào)：2379046