【作者】 孙伟；

【导师】 董华英； 梁贵书；

【作者基本信息】 华北电力大学（河北） ， 电工理论与新技术， 2008， 硕士

【摘要】 气体绝缘变电站(GIS)中的分合闸操作产生的特快速暂态过电压(VFTO)对电力系统安全运行存在危害,特别是对直接连接到GIS的变压器影响尤为严重。为了研究GIS中VFTO对变压器的影响,也为了解决大型电力变压器建模时方程数目庞大问题,本文前几饼以匝为单元、后面匝合并建立了变压器绕组的多导体传输线(MTL)降阶模型。采用不同变压器绕组参数计算方法比较了其对仿真结果的影响。用降阶模型仿真分析和计算了不同变压器绕组线匝的末端电压和匝间电压分布。仿真结果与试验结果吻合,说明了文中方法的可行性和正确性。更多还原

【Abstract】 Switching operations in Gas Insulated Substations (GIS) may generate Very Fast Transient Overvoltage (VFTO) which is very dangerous for the power system, especially for the transformer which is directly connected to GIS. For a real transformer winding, if each turn is simulated as one transmission line, a system of very large-scale equations will be obtained. Multi-conductor Transmission line (MTL) model based on the representation of the winding by its individual turns of several coils and some turns combinated are used to analyze the transient response of transformer windings under VFTO. This paper presents a model based on MTL using order-reduced method to simplify the calculation. Using the different methods of calculating the transformer winding parameters compared its impact on the simulation results. For validation, the calculated results are compared with the measurements on a transformer winding model and the result is satisfactory.更多还原