短线故障区附加容量对暂态恢复电压的影响

J. Rahimov, S. Sultonov, Shokhin D. Dzhuraev, Sultan M. Hamdy, A. G. Kayumov
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引用次数: 3

摘要

当高压断路器触点短路故障清除时,会产生暂态恢复电压(TRV)。对总电压贡献最大的是来自输电线路侧触地处的恢复电压分量,具有锯齿波的特征。这些高频锯齿波由电压源叠加在RV主元件上,使TRV的上升速率非常高,难以通过CB切断短路电流。世界经验表明,在CB线路端子之间安装额外容量的帮助下,有可能防止此类事故。为评估附加容量对110 kV SF6断路器触点随需电压上升速率的影响,利用EMTP - RV软件包设计计算了各参数开断室内电磁瞬变的数学模型。
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Effect of Additional Capacities on Transients Recovery Voltage in the Short – Line – Fault Regime
When short-circuits fault clearing at the contacts of high-voltage circuit breakers (CB), a transient recovery voltage (TRV) appears. The largest contribution to TRV bring in by the component of the recovery voltage (RV) between the contact of the CB and the earth from the side of electric transmission lines, which has the character of sawtooth wave. Being superimposed on the main component of the RV from the voltage source, these high-frequency sawtooth waves cause a very high rate of rise of the TRV and thus make it difficult to current interruption of the short circuit current by CB. As world experience shows, it is possible to prevent such accidents with the help of additional capacities installed between the line terminals of the CB. Assessment the effect of additional capacity on the rate of rise of the TRV in demand on the contacts of a 110 kV SF6 CB, by a software package EMTP – RV was designed calculated mathematical model electromagnetic transients within the parameters interrupting chamber.
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