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Air Gap Inductance Calculation for Transformer Transient Model
IEEE Transactions on Power Delivery ( IF 4.4 ) Pub Date : 2020-07-16 , DOI: 10.1109/tec.2020.3009818
Milad Akbari , Afshin Rezaei-Zare , Muhammad Ali Masood Cheema , Tomasz Kalicki

Zero sequence characteristic and parameters play a vital role in some transformer transients involving unbalance or saturation conditions such as inrush, ferroresonance, and Geomagnetically Induced Current (GIC). An important parameter of the zero-sequence characteristic is the inductance of the air gap between the core and the tank. Based on a Finite-Element Method (FEM), this letter determines the air gap inductance, considering fringing flux effects. The comparison of the simulation results with an analytical method shows a good agreement for small air gaps but reveals a significant difference for relatively large air gaps. Thus, an inductance enhancement factor (IEF) is introduced to correct the analytical results and facilitate the transformer modeling parameter estimation from the design data. Furthermore, the significance of the accurate calculation of the air-gap inductance is demonstrated in the time-domain simulation of different saturation levels of the transformer core, when the transformer is subjected to GIC.

中文翻译:

变压器暂态模型的气隙电感计算

零序特性和参数在某些涉及不平衡或饱和条件的变压器瞬变中起着至关重要的作用,例如涌入,铁磁谐振和地磁感应电流(GIC)。零序特性的一个重要参数是铁心与储罐之间气隙的电感。该字母基于有限元方法(FEM),考虑了边缘磁通量效应来确定气隙电感。仿真结果与分析方法的比较表明,对于较小的气隙,可以很好地吻合,但是对于较大的气隙,则可以显示出显着的差异。因此,引入了电感增强因子(IEF)来校正分析结果,并有助于根据设计数据估算变压器建模参数。此外,
更新日期:2020-07-16
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