550kvgis隔离开关产生的过电压计算毕业设计论文.docVIP

摘要 随着我国电力工业的高速发展和电压等级的不断提高，气体绝缘变电站（GIS）在我国电力系统中的应用越来越广泛。气体绝缘变电站的特快速暂态过程对运行安全可靠性的影响也得到了越来越高的重视，尤其是GIS在我国特高压电网中的应用前景使其受关注不断提高。近年来GIS隔离开关操作引起的快速暂态问题更加突出，主要是以GIS中陡波前过电压（VFTO）对设备本身及相邻设备的影响，因此通过VFTO的计算以指导超、特高压GIS绝缘设计。 首先介绍了GIS产生的机理及其结构和特性，其次是关于电磁暂态程序（EMTP）的学习，最后是对VFTO的计算。以550KV GIS为例，首先，计算模型及其等效参数的确定，根据现有文献资料确定主线路和GIS内部元件的计算模型和具体的等效参数。其次，确定GIS的操作方式，根据有关的论文资料以及电站的电气接线特点确定GIS的具体操作方式。最后，针对每一种操作方式，计算由隔离开关操作引起的VFTO值。 通过分析对不同运行工况下GIS内部各节点的快速暂态过电压，从而确定VFTO是否会对设备本身以及相邻设备造成危害，以此来指导GIS的绝缘设计。 关键词：GIS；VFTO；EMTP;计算模型 Abstract With the high speed development of our country electric power industry and the increasing of voltage grade, gas insulated substation (GIS) applications in power system in our country is more and more widely. Fast transient process of gas insulated substations influence on the running safety and reliability also got more and more attention, especially the application foreground of GIS in uhv power grid in our country so that it is increasing attention. In recent years GIS disconnector operation caused by the rapid transient problem become more prominent, mainly steep wave front overvoltage (VFTO) in GISs influence on the equipment itself and the adjacent equipment, therefore the VFTO through the calculation to guide, uhv GIS insulation design. First introduces the formation mechanism of GIS and its structure and features, the second is about the study of electromagnetic transient program (EMTP), and at last the calculation of VFTO. With 550 kv GIS as an example, first of all, the determination of calculation model and the equivalent parameters, according to the current literature to determine the main road and the GIS calculation model and the equivalent parameters of internal components. Second, determine the operating mode of GIS, according to the information about the paper as well as the power station electrical wiring characteristics of GIS, the mode of operation is determined. Finally, in view of each kind of operating mode, calculation caused by di