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一、大跨越导线舞动 华中电网多处大跨越,导线频繁舞动。钟祥县汉水中山口大跨越1055m(姚双、双凤线共塔),近三年的2、3、12月连续发生5次导线强烈舞动,最长的时间三天两夜;最大的振幅(峰—峰)达10m;损失最严重的是子导线(三分裂之一)断落江中的事故。1987年2月汉阳县长江金口大跨越1166m(葛凤、双凤线共塔)亦发生舞动。1989年1月岗云线湖南湘江与为水河大跨越,舞动持续48 相似文献
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The effect of dV/dt on the IGBT gate circuit in IPM is analyzed both by simulation and experiment.It is shown that a voltage slope applied across the collector-emitter terminals of the IGBT can induce a gate voltage spike through the feedback action of the parasitic capacitances of the IGBT.The dV/dt rate,gate-collector capacitance, gate-emitter capacitance and gate resistance have a direct influence on this voltage spike.The device with a higher dV/dt rate,gate-collector capacitance,gate resistance and lower gate-emitter capacitance is more prone to dV/dt induced self turn-on.By optimizing these parameters,the dV/dt induced voltage spike can be effectively controlled. 相似文献
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