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。
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, 68, 26, 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.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第8期107-113,共7页
High Voltage Apparatus
关键词
干式变压器
耦合场
磁场
流体温度场
过负荷能力
ventilated dry-type transformer
coupled-field
magnetic field
fluid-thermal field
overload capability
作者简介
兰贞波（1988-），男，硕士，工程师，研究方向为高压电器及电磁场数值计算。
文武（1966-），男，博士，副教授，研究方向为电磁场数值计算及电力系统电磁兼容。
阮江军（1968-），男，博士，教授，博士生导师，从事电磁场数值计算、电能质量及电磁兼容方面的研究。
