变压器真空汽相干燥过程的传热传质计算.doc

文档介绍：变压器真空汽相干燥过程的传热传质计算
张世伟1 乔保振2
(1东北大学机械工程与自动化学院沈阳110004;2沈阳诚桥科技开发有限责任公司沈阳 110004)
摘要:本文简要介绍了变压器真空汽相干燥技术的用途、工作原理、设备组成和工艺流程,针对国内变压器真空汽相干燥工艺过程缺少理论依据的问题,较详细地叙述了作者所建立的反映变压器真空汽相干燥工艺过程热质传递规律的综合数学模型,说明了其建模原理和模型功能。最后介绍了该模型在设备设计、过程模拟及工艺过程控制方面的应用。
关键词:变压器,汽相干燥,传热传质,模型
Calculation of Mass and Heat Transferin Vapor-Phase Drying Process of Power Transformer
Zhang Shiwei1 Qiao Baozhen2
(1 School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004;
2 Shenyang Truth Bridge Science and Technology . Developing LTD. Shenyang 110004)
Abstract: Application, principle, equipment and technologic process of the vapor-phase drying (VPD for short) of electric power transformer are introduced in brief. In view of the fact that the theory study about VPD is rather scarce, plex mathematic model for the mass and heat transfer process in VPDs is developed by author. The principle and function of the model are described in detail. Model’s applications in equipment design, process simulation and process control are given at last.
Keywords: Power Transformer; Vapor-Phase Drying; Mass and Heat Transfer; model
1 真空汽相干燥的用途与原理
真空汽相干燥(Vapor-phase Drying,简记VPD),亦称为煤油汽相干燥,是一种专门用于大型油浸式变压器以及其它类似电器设备干燥处理的技术和设备。
在油浸式变压器的器身上,除了铁心和导线之外,几乎全是由各种形态的纤维质材料构成的固体绝缘材料。这些绝缘材料中含水量的多少,直接影响介质的介电强度、介质损耗和油的含水量,从而决定整个变压器的电气绝缘性能。变压器干燥的目的就是去除绝缘材料中的水份。根据变压器不同电压等级及容量的具体要求,可以确定器身所用绝缘材料的最终含水量标准,变压器电压等级越高