In gas-insulated substations (GIS), very fast transient overvoltages (的简体中文翻译

In gas-insulated substations (GIS),

In gas-insulated substations (GIS), very fast transient overvoltages (VFT) with oscillationfrequencies in the MHz range may occur during disconnector switching because of the fastvoltage collapse within a few nano-seconds and the length and coaxial design of the GIS. Inthe vicinity of the operated disconnector frequencies of up to more than 100 MHz may arise.At more distant locations inside the GIS frequencies of still several MHz can be expected.The frequencies and the amplitudes of the VFT depend on the length and the design of theGIS and on the ratio of the source and the load side. Due to the travelling wave nature of thephenomenon, the voltages and frequencies differ from location to location within the GIS.High amplitudes occur if long sections are switched, if side buses exist at the feeding section,if the natural frequencies of the feeding and the switched side are similar and if the voltagedifference across the disconnector is high. Such a high voltage difference occurs for openingof the disconnector at the end of the switching operation (e.g. at one of the last restrikes) dueto the increasing dielectric strength of the gap and for closing at the first prestrike due to atrapped charge from the last opening operation. The highest amplitudes of the VFT normallyoccur at open GIS sections.
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在气体绝缘变电站(GIS)中,<br>由于<br>在几纳秒内迅速崩溃的电压以及GIS的长度和同轴设计,在隔离开关切换期间可能会发生振荡频率在MHz范围内的非常快速的瞬态过电压(VFT)。在<br>操作的隔离开关附近,可能会出现高达100 MHz以上的频率。<br>在GIS内部更遥远的位置,可以预期仍为几个MHz。<br>VFT的频率和幅度取决于<br>GIS 的长度和设计以及源与负载侧的比率。由于<br>现象的行波性质,电压和频率在GIS中的位置各不相同。<br>如果切换长段,在馈电段存在侧边母线,<br>如果馈电和开关侧的固有频率相似,并且<br>隔离开关两端的电压差很高,则振幅会很高。这样高的电压差会<br>由于开关<br>的绝缘强度增加而在开关操作结束时断开隔离开关(例如,在最后一个重击中的一个),而在第一次预触时由于<br>从开关管中捕获的电荷而闭合。最后打开操作。VFT的最高振幅通常<br>发生在开放的GIS区域。
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结果 (简体中文) 2:[复制]
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In gas-insulated substations (GIS), very fast transient overvoltages (VFT) with oscillation<br>frequencies in the MHz range may occur during disconnector switching because of the fast<br>voltage collapse within a few nano-seconds and the length and coaxial design of the GIS. In<br>the vicinity of the operated disconnector frequencies of up to more than 100 MHz may arise.<br>At more distant locations inside the GIS frequencies of still several MHz can be expected.<br>The frequencies and the amplitudes of the VFT depend on the length and the design of the<br>GIS and on the ratio of the source and the load side. Due to the travelling wave nature of the<br>phenomenon, the voltages and frequencies differ from location to location within the GIS.<br>High amplitudes occur if long sections are switched, if side buses exist at the feeding section,<br>if the natural frequencies of the feeding and the switched side are similar and if the voltage<br>difference across the disconnector is high. Such a high voltage difference occurs for opening<br>of the disconnector at the end of the switching operation (e.g. at one of the last restrikes) due<br>to the increasing dielectric strength of the gap and for closing at the first prestrike due to a<br>trapped charge from the last opening operation. The highest amplitudes of the VFT normally<br>occur at open GIS sections.
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结果 (简体中文) 3:[复制]
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在气体绝缘变电站(GIS)中,具有振荡的快速暂态过电压(VFT)<br>由于速度快,在隔离开关切换过程中可能出现频率在MHz范围内<br>几纳米秒内电压崩溃与GIS的长度和同轴度设计。在<br>操作隔离开关的频率可能会超过100兆赫。<br>在地理信息系统内部较远的地方,预计频率仍有几兆赫。<br>VFT的频率和振幅取决于VFT的长度和设计<br>地理信息系统和源端与负载端的比率。由于<br>现象,电压和频率在地理信息系统中的位置不同。<br>如果切换长段,如果馈电段存在侧母线,则会出现高振幅,<br>如果馈电侧和开关侧的固有频率相似,并且电压<br>隔离开关上的差异很大。这样的高电压差发生在断路器上<br>开关操作结束时的隔离开关(例如,在最后一次重新通电时)<br>随着间隙介电强度的增加,以及由于<br>上一次打开操作中捕获的电荷。正常情况下VFT的最高振幅<br>出现在开放的地理信息系统部分。<br>
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