The short-circuit withstanding performance of busbar system is one of the most important safety indexes for low-voltage (LV) switchgear. The resonance characteristics, short-circuit displacement, and stress concentration of four typical busbar system arrangements are numerically analysed in this study. First, modal analysis is used to calculate the vibration modes and natural frequencies of the busbar systems. The influence of span length and phase-to-phase distance is discussed and thresholds for resonance prevention are given. Then, electromagnetic-structural coupled models are built to simulate the short-circuit mechanical response. The time-varying displacement and stress are obtained and the dynamic stability of typical arrangements is compared. The proposed results can provide theoretical reference for the dynamic stability design of busbar system in LV switchgear.

中文翻译：

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低压开关柜中母线系统短路耐受性能的数值分析

母线系统的耐短路性能是低压开关设备最重要的安全指标之一。本研究对四种典型母线系统布置的谐振特性，短路位移和应力集中进行了数值分析。首先，模态分析用于计算母线系统的振动模式和固有频率。讨论了跨距长度和相间距离的影响，并给出了防止共振的阈值。然后，建立电磁-结构耦合模型以模拟短路机械响应。得到了随时间变化的位移和应力，并比较了典型布置的动力稳定性。