Calculation of Core Hot-Spot Temperature in Power and Distribution Transformers
Calculation of Core Hot-Spot Temperature in Power and Distribution Transformers
复制标题
电力和配电变压器铁心热点温度的计算
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Zhou
中科院分区：
文献类型：
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作者：
E. teNyenhuis;R. Girgis;G. Mechler;G. Zhou
在设计阶段准确计算堆芯热点温度值变得非常重要，以确保在堆芯热点温度低至110-120 ºC时限制油膜降解可能导致的氢气生成。提出了两种计算方法，为此目的而开发的。电力和配电变压器的三相三柱铁芯中的热点温度的位置和值的有限元计算的结果显示出良好的协议与测试值的一些变压器。从这一分析中获得的见解被用来加强以前可用的经验方法。这种简化的计算方法适合于日常使用，因此也适用于设计计算。在大多数情况下，这种方法在2 ºC的范围内显示出非常好的准确性。简化的计算方法也被证明提供了一个更大的精度比原来的经验方法。
Accurate calculation of the value of the core hot-spot temperature at the design stage is becoming very critical in order to ensure that hydrogen generation that can be caused by oil-film degradation at core hot-spot temperatures as low as 110-120 ºC is limited. Presented are two calculation methods developed for this purpose. Results of the FEM calculation of the location and value of the hot-spot temperature in cores of three-phase, three-limb cores of power and distribution transformers show excellent agreement with tested values on a number of transformers. Insight learned from this analysis was used to enhance a previously available empirical method. This simplified calculation method is appropriate for everyday use and, hence, is suitable for design calculations. This method was shown to have very good accuracy in the range of 2 ºC for most of the cases. The simplified calculation method was also shown to provide a much greater accuracy than the original empirical method.