Analysis of Multi-physical Field in Ventilated Dry-type Transformer with FEM Method

LAN Zhenbo; WEN Wu; RUAN Jiangjun; ZHU Jun

doi:10.13296/j.1001-1609.hva.2015.08.018

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Analysis of Multi-physical Field in Ventilated Dry-type Transformer with FEM Method

更新时间：2025-04-26

- Analysis of Multi-physical Field in Ventilated Dry-type Transformer with FEM Method
- High VoltageApparatus Vol. 51, Issue 8, Pages: 107-113(2015)
- 作者机构：
  
  1. 国网电力科学研究院武汉南瑞有限责任公司
  2. 武汉大学电气工程学院
  3. 中国船舶重工集团公司第七一二研究所
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2015.08.018
  CLC： TM406
- Published：2015
- 稿件说明：
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[1]兰贞波,文武,阮江军,朱军.基于有限元法的干式变压器多物理场分析计算[J].高压电器,2015,51(08):107-113.

LAN Zhenbo, WEN Wu, RUAN Jiangjun, et al. Analysis of Multi-physical Field in Ventilated Dry-type Transformer with FEM Method[J]. High voltageapparatus, 2015, 51(8): 107-113.
[1]兰贞波,文武,阮江军,朱军.基于有限元法的干式变压器多物理场分析计算[J].高压电器,2015,51(08):107-113. DOI： 10.13296/j.1001-1609.hva.2015.08.018.

LAN Zhenbo, WEN Wu, RUAN Jiangjun, et al. Analysis of Multi-physical Field in Ventilated Dry-type Transformer with FEM Method[J]. High voltageapparatus, 2015, 51(8): 107-113. DOI： 10.13296/j.1001-1609.hva.2015.08.018.

摘要

变压器的正常稳定运行对电力系统有着重要意义

而温度是衡量变压器运行状态的一个重要指标。笔者基于有限元的耦合场计算得到了干式变压器的温度分布。首先

通过三维磁场的计算得到变压器的各部分损耗

然后将损耗作为载荷加载至二维稳态流体—温度场的模型中计算对应的温度分布

通过变压器样机的测温实验验证了该方法的准确性。同时也分析了对应的二维瞬态流体—温度场

最后将变压器最大允许运行温度值作为参考

得到了变压器不同过负荷情况时的允许运行时间

结果表明:该干式变压器在10%过负荷情况下能正常持续工作

而在过负荷分别为20%、30%、40%和50%的情况下最大允许运行时间分别是127、68、26、8 min。该工作为同类型干式变压器的过负荷运行能力提供了可参考的依据。

Abstract

Temperature is an important index to measure operation state of a power transformer. In this paper

the coupled-field finite-element method is used to calculate the temperature distribution of a ventilated dry-type transformer. Firstly

power loss of each component of the transformer is obtained by three-dimensional（3D）magnetic field calculation. Then the losses are input to the two-dimensional（2D）steady-state fluid-thermal field model as a load to calculate the temperature distribution of the transformer. Temperature measurement experiment shows that the computed temperature rise is in good agreement with the measured value. Moreover

the 2D transient fluid-thermal field is calculated by using the power losses in overcurrent condition. Finally

the maximum allowable temperature value of the transformer is taken as the reference to get the transformer’s maximum permissible working time for different overload conditions. The results show that the dry-type transformer can work normally at 10% overload

while the maximum permissible working time is 127

and 8 minutes as the overload is 20%

30%

40% and 50%

respectively. This study may provide a reference for understanding overload capability of this kind of ventilated dry-type transformers.

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