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首页> 外文期刊>International journal of applied electromagnetics and mechanics >Fault analysis and simulation of ground-fault accident on transformer in 500 kV AC/DC grids
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Fault analysis and simulation of ground-fault accident on transformer in 500 kV AC/DC grids

机译:500 kV AC / DC网格变压器地面故障事故的故障分析与仿真

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摘要

An actual occurred ground-fault accident of 500 kV transformers in HVDC converter station is presented. A 2D transient electromagnetic-thermal-mechanical finite-element coupling model of 500 kV transformer is developed to analyze the transient process of failure, with consideration of the resistance-temperature relationship and plasticity displacement in the windings' thermal and mechanical characters. To verify the proposed finite-element model, the model is calibrated by pre-fault field test of the transformer in steady state, which shows good agreement with measurement. The short-circuit current adopted in simulation is based on actual on-site measurement of the ground-fault accident. By using the proposed model, simulation results reflect the transient process and explain the post-fault inspected damage well in term of over burn regions in thermal analysis and deformation tendency in mechanical analysis when compared with field post-fault inspection photos.
机译:提出了HVDC转换器站500 kV变压器的实际发生的接地故障事故。 开发了500 kV变压器的2D瞬态电磁 - 热机械有限元耦合模型,以分析失效的瞬态过程,考虑到绕组热和机械特性的电阻温度关系和塑性位移。 为了验证所提出的有限元模型,该模型被变压器的预故障现场测试校准,稳定状态,显示与测量良好的一致。 模拟中采用的短路电流基于实际的地面故障事故的现场测量。 通过使用所提出的模型,仿真结果反映了瞬态过程,并在与场故障检查照片相比,在机械分析中的热分析和变形趋势中的过度故障检查损失良好。

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