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Ground-wall insulation system analysis combining advanced imaging techniques and numerical simulation

机译:结合先进的成像技术和数值模拟的地下墙保温系统分析

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摘要

High resolution X-ray computed tomography is used to reconstruct the interior of a sample of an insulation system based on mica-paper tapes impregnated with polyester imide resin that is used in ground-wall insulation of a.c. motor - and generator - windings rated 11 kV and above. The tomographic volume is post-processed to identify the presence of minute voids, air-bubbles and very low-density zones that can bring-on partial discharges and material deterioration critical for the operative life of the rotating machines. The tomographic volume is segmented into different materials and a computational mesh is built on it. The electrostatic field is simulated under suitable boundary conditions at the copper conductors and at the ground side. The numerical model allows predicting the maximum intensity of the electric field in critical zones and spotting points above the 2.2 kV/mm threshold, as derived from experimental partial discharge inception voltage carried out on the coil, yielding an indirect pre-evaluation of the insulating material that can guide the improvement of the manufacturing process (i.e. impregnation taping).
机译:高分辨率X射线计算机断层摄影术用于重建绝缘系统样品的内部,该系统基于浸渍有聚酯酰亚胺树脂的云母纸带,该云母纸带用于交流电的地面绝缘。电动机和发电机绕组的额定值为11 kV及以上。层析体积经过后处理,以识别微小空隙,气泡和极低密度区域的存在,这些微小区域会导致局部放电和对旋转机械的使用寿命至关重要的材料劣化。层析体积被分成不同的材料,并在其上建立计算网格。在合适的边界条件下,在铜导体和接地侧模拟静电场。数值模型可以预测在临界区域和高于2.2 kV / mm阈值的点处的电场的最大强度,这是根据在线圈上进行的实验性局部放电起始电压得出的,从而间接评估了绝缘材料可以指导制造工艺的改进(即浸渍胶粘)。

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