油浸式變壓器散熱之研究

Study of Heat Dissipation on Oil-Immersed Power Transformers

林盈甫(Ying-Fu Lin)

指導教授 ： 蔡瑞益

中原大學/工學院/機械工程研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000544

摘要

本文基本概念為在油浸式變壓器的線圈加入油道，以浮力效應之自然對流以達到散熱效果，台電167kVA油浸式變壓器是在裝載著大量絕緣油的變電箱裡，只能利用絕緣油自然對流來散熱，因此油道對變壓器的散熱之影響非常的重要。有鑑於此，故想探討油道不同配置的散熱情況以及溫度分佈情形。
本文以CFDRC計算流體力學套裝軟體作數值分析，模擬研究不同油道配置下，變壓器經由絕緣油自然循環的溫度場與速度場分佈情況。油道寬度範圍取2mm~5mm，油道支數分別取3支、4支、5支，線圈高度取300mm、400mm、500mm，及不同材質的外側低壓線圈來作探討，研究主要討論油浸式變壓器的高低壓線圈溫度及油道流速。結果顯示油道寬度與支數增加會提供較多的散熱途徑，絕緣油循環相對提升。線圈高度會影響油道的流速，而外側低壓線圈材質的改變，其熱性能差異性不大。

關鍵字

油浸式變壓器 ； 自然對流

並列摘要

The main purpose of this research is to study the thermal dissipation by natural convection of oil-immersed transformer with flow channels. The 167kVA oil-immersed power transformer is installed inside the utility box. The only way to cool it down. Therefore, the flow channel is very important for thermal dissipation of transformer. Hence, this study from the thermal dissipation in different flow channels in order to understand the temperature distribution in the transformer.
This article uses CFDRC to simulate the velocity field as well as the temperature field in different flow channel types. The numerical experiment herein is proceeded by taking flow channels of 2mm~5mm width, flow channels 3, 4, 5 pcs, heights of coils 300mm, 400mm, 500mm, and the external layer of the low voltage coil windings with different materials. The main discussion will be on temperatures of high and low voltage oil-immersed transformer and velocity of flow channel. Result shows increase of the width of flow channels and Increase of flow channels provides more cooling channels, and accelerate oil cycling. Heights of coils influence velocity of oil flow. However, materials change on the external layer of the low voltage coil windings does not make significant differences on thermal dissipation.

並列關鍵字

Natural convection ； Oil-immersed transformer

參考文獻

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