Influence analysis of cascading failure in linear transformer driver caused by group prefire
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摘要: 建立电路模型分析了28级单路直线变压器驱动源（LTD）中可能出现的组件自放电连锁故障过程。结果表明当任何一个4级组件被误触发时，均会导致整个单路LTD连锁动作，产生的故障电压无法被单路驱动源输出端的隔离开关限制。且当误动的组件位于单路LTD下游时，电压沿着传输线向上游传播会在第1组件较低阻抗的传输线上产生远高于正常放电时的峰值场强，有可能引发装置的绝缘故障。通过适当增加第1组件传输线内外导体的间隙可以在几乎不影响负载电流输出幅值和波形的前提下削弱反向传播的连锁故障导致的高峰值场强，从而提高装置运行的可靠性。Abstract: A circuit model is established to analyze the possible cascading failure process of group prefire in 28-stage linear transformer driver (LTD). The results show that when a 4-stage group is triggered by mistake, it will cause the entire 28-stage LTD chain action, and the generated fault voltage cannot be limited by the isolation switch at the output of the 28-stage LTD. In addition, when the faulty group is located downstream of the LTD, the voltage propagating upstream along the transmission line will produce a peak field strength on the transmission line of the lower impedance of the first group that is much higher than the normal operations, which may cause the insulation failure of the device. By appropriately increasing the gap between the inner and outer conductors of the transmission line of the first group, the peak field intensity caused by the cascading failure can be weakened without affecting the output amplitude and waveform of the load current, thus improving the reliability of the operation of the device.
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Key words:
- linear transformer driver /
- prefire /
- cascading failure /
- reliability
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图 1 28级LTD装置的结构与触发方式
Figure 1. Structure and triggering mode of the 28-stage LTD device
图 4 第1组件放电时第5级模块开关上的电压波形
Figure 4. Voltage on gas switches in the 5th stage module when the 1st group prefire
图 6 不同组件放电时上下游模块开关上的电压峰值
Figure 6. Voltage on gas switches in the upstream and downstream stage module when different groups prefire
图 7 正常时序放电时传输线峰值场强分布
Figure 7. Distribution of peak field intensity of transmission line during normal sequential discharge
图 8 不同组件自放电连锁故障在每级模块水线处的电场强度
Figure 8. Electric field strength at the transmission line of each stage when different groups prefire
图 9 第7组件自放电时模块处水线电场强度波形
Figure 9. Electric field strength at the transmission line when the 7th group prefire
图 10 第1组件不同底面直径时的负极性传输线峰值电压和场强
Figure 10. Negative peak voltage and peak field intensity of cascading failure with different bottom diameters of the 1st group
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