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Influence of zero sequence impedances of station auxiliary transformers on equipment performance under open-phase faults

机译:站辅助变压器零序阻抗对开放式断层设备性能的影响

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Primary open-phase faults on station auxiliary transformers (SATs) are characterized by the presence of voltage unbalance at the auxiliary equipment level that could lead to protective device tripping, increased motor acceleration times, overheating or failure to start critical safety loads, particularly in the nuclear power industry. The transformer primary to ground zero sequence impedance has a profound impact on the voltage balance on the secondary (equipment) level but its effects not been fully analyzed in the context of nuclear power plant operation. This study investigates the influence of zero sequence impedance to ground as seen from the transformer primary terminals during an open-phase condition on the performance of nuclear plant auxiliary equipment, in particular the effect on large motor starting and running performance. Dynamic models for the motors were employed and adapted to the sequence network representing the overall system. The resulting system was simulated for a number of open-phase conditions using transformer characteristics representative of the SATs encountered in the nuclear power industry. It was revealed that a lower value of this impedance has a beneficial effect on motor acceleration time and voltage balance for both starting and steady state conditions. The influence of neighboring transformers with a path to ground was also investigated and found to serve towards further improvement of performance.
机译:站辅助变压器(SAT)上的主要开放相故障是在辅助设备水平上存在电压不平衡的特征,可能导致保护装置跳闸,增加电机加速时间,过热或未启动关键安全载荷,特别是在核电工业。变压器初级到研磨零序阻抗对次级(设备)水平的电压平衡产生了深刻的影响,但在核电站运行的背景下没有完全分析其效果。本研究调查从核电站辅助设备性能的开放式条件期间从变压器主端子看零序阻抗对地面的影响,特别是对大电机启动和运行性能的影响。采用电动机的动态模型,并适用于代表整个系统的序列网络。使用代表核电工业中遇到的SATS的变压器特性,模拟了所得系统的许多开放式条件。据透露,该阻抗的较低值对用于起动和稳态条件的电动机加速时间和电压平衡具有有益的影响。还研究了与地面路径的相邻变压器的影响,并发现用于进一步提高性能。

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