陡波下500kV GIS同轴母线管道的暂态电场特性  

Transient Electric Field Characteristics for Coaxial Bus Duct of 500 kV GIS Under Steep Wave

作　　者：张福增 杨瑞[2] 贺恒鑫[2] 何俊佳[2] 刘磊 

机构地区：[1]直流输电技术国家重点实验室(南方电网科学研究院),广州510663 [2]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074

出　　处：《南方电网技术》2017年第8期41-48,共8页Southern Power System Technology

基　　金：国家工程实验室开放基金资助项目(NEL201604)~~

摘　　要：为准确指导500 kV GIS同轴母线管道的绝缘设计,有必要同时考虑同轴母线管道引起的电场畸变和不同电压波形下的电场动态分布特性。以某公司制造的500 kV GIS中的L型和T型母线管道为例,基于时域有限差分法对其在特快速暂态过电压下和雷电波下的暂态电场特性进行了研究。计算结果表明:在L型母线中,特快速暂态过电压下电场峰值小于稳态时的电场峰值,但应注意波头的折反射;相比L型母线,相同电压陡度下T型母线的折反射更加明显,在施加4 ns的斜角波时,电场峰值约为稳态值的1.13倍,且在波头部分存在明显振荡,绝缘设计须采用暂态电场校核;雷电波下,L型母线和T型母线中各节点电场几乎无折反射,电场可用静电场的计算结果校核。To accurately guide the insulation design of coaxial bus duct of 500 kV GIS,it is necessary to study the dynamic distribution characteristics of electric field caused by structure and different voltage waveform. Taking the L-type and T-type bus bars in 500 kV GIS manufactured by a company as examples,the transient electric field characteristics under very fast transient voltage and lightning wave are studied based on time domain finite difference method. Results show that under very fast transient overvoltage,the peak value of the electric field in the L-type bus is smaller than that of the electric field under steady state,but the reflection of the wave front should be paid attention to. In the T-type bus,the reflection of the electric field is larger than that in the L-type bus. The maximum value of electric field is about 1. 13 times as large as the steady-state value,and there is obvious oscillation in the wave front when 4 ns ramp wave overvoltage is applied,so it is needed to use transient electric field to check the insulation design. Under lightning wave,there is no reflection in the electric field of each node in the L-type bus and the T-type bus,and the electric field can be verified by the calculation result of the electrostatic field.

关 键 词：GIS母线 暂态电场 雷电波 特快速暂态过电压 时域有限差分法 

分 类 号：TM154.1[电气工程—电工理论与新技术]