大型油浸式自冷变压器温升的研究

发布时间：2018-01-06 06:24

本文关键词：大型油浸式自冷变压器温升的研究　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：油浸式变压器具有电压等级高、散热好、损耗低、容量大、价格低等特点。目前电网上运行的电力变压器大部分为油浸式变压器,其中80%以上是采用自然油循环的冷却方式。为了解决大型电力变压器的噪音大和油流带电等问题,现在大型电力变压器也普遍采用自然油循环冷却方式。采用自然油循环冷却方式会导致变压器铜油温差加大,变压器的热问题就更加突出。现在变压器厂普遍采用的油浸式变压器温升的工程计算方法根据经验公式,不能很好的反应变压器的实际温升,有时可能产生较大的偏差。本文根据传热学基本原理和经典试验换热准则,通过对变压器发热冷却原理进行分析和研究,总结出了一套能够比较准确计算自然油循环冷却和绕组带导向结构的大型电力变压器平均油温升、顶层油温升、绕组温升的计算方法。并对影响变压器温升的主要因素：总损耗、散热器位置、绕组的结构进行了分析。最后通过和三变科技的产品SSZ10-ZN-240000/220带光纤测温的温升试验得出的结果进行验证,计算值和试验值比较接近,可以满足工程使用需要。
[Abstract]:The oil-immersed transformer has the characteristics of high voltage grade, good heat dissipation, low loss, large capacity, low price and so on. At present, most of the power transformers running on the power network are oil-immersed transformers. In order to solve the problems of large power transformer such as high noise and electrified oil flow, more than 80% of them adopt natural oil circulation cooling method. Now large power transformers also generally use natural oil cycle cooling mode. Natural oil cycle cooling mode will lead to transformer copper oil temperature difference increase. Nowadays, the engineering calculation method of oil-immersed transformer temperature rise, which is widely used in transformer factory, can not reflect the actual temperature rise of transformer well according to the empirical formula. According to the basic principles of heat transfer and classical experimental heat transfer criterion, the principle of transformer heating and cooling is analyzed and studied in this paper. The average oil temperature rise and the top oil temperature rise of large power transformer with natural oil cycle cooling and winding guide structure are summarized. Calculation method of winding temperature rise. Main factors affecting transformer temperature rise: total loss, radiator location. The structure of the winding is analyzed. Finally, the results obtained from the temperature rise test of SSZ10-ZN-240000/220 with optical fiber are verified. The calculated value is close to the experimental value, which can meet the need of engineering use.
【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】：TM411

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