振荡型雷电冲击电压和标准雷电冲击电压在220kV GIS中的分布特性研究  

Voltage Distributions in 220 kV GIS Under Oscillatory Lightning Impulse and Standard Lightning Impulse

作　　者：车斌[1] 张亮[1] 李军浩[1] 王斯斯 李智宁 熊俊 陆国俊 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]广州供电局有限公司电力试验研究院,广州510410

出　　处：《高压电器》2017年第2期125-131,共7页High Voltage Apparatus

摘　　要：GIS具有优良的性能,被广泛应用于电力系统,其在出厂时会进行双指数型冲击考核其绝缘性能,而在现场试验时则会采用振荡型冲击电压波形,在两种冲击电压波形作用下GIS内部各节点的电压分布情况是进行试验结果分析的基础。为了掌握不同类型冲击下的电压分布情况,文中利用数值仿真软件ATP-EMTP,对某220 kV GIS设备进行了仿真建模,分别对振荡雷电冲击波与标准雷电冲击波两种电压波下GIS中波的传播情况和各节点出线的电压分布进行了仿真研究,并对两种电压波作用下的节点电压进行了比对分析。结果表明,相比振荡型雷电冲击,施加双指数雷电冲击时会出现相对较大的过电压,随着测量节点与入口处距离的增加,节点电压降低,波形的畸变减弱。文中的研究结果为GIS现场冲击耐压试验方案的确定、整体绝缘强度的判断提供了数据支持。GIS （gas insulated switchgear） is widely used in power system for its excellent performance. Insulation assessment of GIS by standard impulse is performed in factory,whereas oscillating impulse is adopted in field test. The distribution of voltage on the nodes inside GIS induced by oscillating impulse or standard impulse is the basis for test result analysis. To understand the voltage distribution under the two impulses,this paper adopts the numerical simulation software ATP-EMTP to simulate the wave propagations in a 220 kV GIS, and the voltages on internal nodes induced by the two impulses are obtained and compared. The results show that there will be higher overvoltage under standard lightning impulse than that under oscillating lightning impulse. With the increase of distance between measuring point and entrance, the voltage on node drops and its distortion decreases. This study would provide data support for the choice of field test scheme and insulation evaluation of GIS.

关 键 词：GIS 振荡型冲击电压 标准冲击电压 电压分布 

分 类 号：TM595[电气工程—电器]