关于干式变压器击穿机理的分析与改进措施
发布时间：2018-12-14 17:46
【摘要】：由于干式变压器具有无污染及维护成本低等特点,随着社会经济的快速发展,干式变压器越来越受用户的欢迎。在社会具大的需求下,干式变压器电压等级的提高,绝缘击穿越来越被各厂家所重视,如何控制干式变压器运行时绝缘不被击穿,已成为一个十分重要的课题。干式变压器由铁心、绕组及引线三大部件组成,本论文系统分析了干式变压器绝缘分类、绝缘特性及放电类型。撑握了三大部件的绝缘关系及绕组内部绝缘结构,得出主绝缘的绝缘介质主要是空气,纵绝缘的绝缘介质主要是树脂。采用绝缘试验方法(工频耐压试验、感应耐压试验和局部放电试验)来考核干式变压器内外部绝缘性能,找出变压器绝缘薄弱位置。通过变压器各部位的耐受电场强度要求,计算出各部位的绝缘距离,结合绝缘试验结果,进一步提高绝缘距离,主要是为了降低各部位的场强。对于干式变压器制造过程中加强工艺控制,消除导线毛刺、绕组开裂及绕组内部有气泡,可以有效提高绝缘性能。通过对干式变压器的绝缘击穿机理分析和采取相应有效措施(降低各部位的场强,制造工艺进行加强),通过三个绝缘击穿实例验证,采取相应的措施非常有效的提高了干式变压器绝缘性能。根据以上措施制造的变压器可以在实际环境中可靠的运行。
[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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM412
本文编号：2379046
[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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM412
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相关期刊论文 前1条
1 宁瑞德;;电力变压器局部放电及其现场试验[J];山西电力;2009年04期
相关硕士学位论文 前1条
1 付作峰;局放信号的高频检波电路设计[D];西安电子科技大学;2011年
，本文编号：2379046
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