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Mitigation of Very Fast Transient Overvoltages at the More Sensitive Points in Gas Insulated Substation

机译:缓解气体绝缘变电站中更敏感点处的非常快的瞬态过电压

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Switching operations in a gas insulated substations generate Very Fast Transient Overvoltages (VFTO) which are dangerous for the transformer and the system insulation because of their short rise time. Under special circumstances, the terminal overvoltages can arise close to the transformer BIL. The suppression of VFTO is very important in GIS systems. Different techniques are applied to 245 kV GIS Model. The simulation used ATP-EMTP package program to evaluate the VFTO at the sensitive points in GIS. The different results are compared to determine the effective mitigation method. The results show that the wave steepness and the amplitudes of VFTO can be reduced to about 1 pu with less oscillation frequency.
机译:气体绝缘变电站的开关操作会产生非常快速的瞬态过电压(VFTO),由于它们的上升时间短,因此对变压器和系统绝缘是危险的。在特殊情况下,端子过电压会在靠近变压器BIL处产生。 VFTO的抑制在GIS系统中非常重要。不同的技术应用于245 kV GIS模型。该仿真使用ATP-EMTP软件包程序来评估GIS中敏感点的VFTO。比较不同结果以确定有效的缓解方法。结果表明,在减小振荡频率的情况下,VFTO的波陡度和幅度可以减小到大约1 pu。

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