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首页> 外文期刊>Arabian Journal for Science and Engineering >Time-Variant Evaluation of Electromagnetic Forces on Transformer Windings During Inrush Current and Short-Circuit by FEM
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Time-Variant Evaluation of Electromagnetic Forces on Transformer Windings During Inrush Current and Short-Circuit by FEM

机译：有限元分析法在涌流和短路期间变压器绕组上电磁力的时变评估

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摘要

Time-variant axial and radial electromagnetic for ces under inrush current and short-circuit current are calculated (by finite element method; FEM) and compared. A simplified analytic method is presented for computation of inrush current in transformer. The simulation results obtained by this method are compared with the measured values. A compact three-phase, core-type 132/20 KV, 30 MVA, power transformer is modeled, employing two-dimensional (2D) FEM, the different forces under short-circuit and inrush current conditions are evaluated as a function of time. The simulation results for this sample transformer show that the inrush current axial force is larger than clamping force (which is equal to the net downward axial force that is exerted on the windings during the steady state short-circuit condition) even 2.4 s after energizing the transformer. Since the inrush current lasts longer and normally occurs more frequently than a short-circuit current in a power transformer (while, at present, it is not covered by the standard tests or transformer design procedures), it can be a serious threat to damage of transformer windings.
机译：计算了浪涌电流和短路电流作用下轴向和径向电磁的时变特性（通过有限元法； FEM）并进行了比较。提出了一种简化的变压器涌流计算方法。通过这种方法获得的仿真结果与测量值进行比较。对紧凑型三相，铁心型132/20 KV，30 MVA电力变压器进行了建模，采用二维（2D）有限元法，评估了短路和浪涌电流条件下的不同力随时间的变化。该示例互感器的仿真结果表明，励磁电流在励磁后的2.4 s内大于励磁电流的轴向力（大于等于稳态短路条件下施加在绕组上的净向下轴向力）的钳制力。变压器。由于浪涌电流的持续时间比电源变压器中的短路电流持续时间更长，并且通常比短路电流更频繁地发生（尽管目前，标准测试或变压器设计程序尚未涵盖），因此可能会严重损害变压器的损坏。变压器绕组。

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