电气技术Issue(11)：6-12,7.
L型GIS管道对电磁波传播的影响及等效电路建模
Influence of L-Shape Part of GIS Enclosure on Electromagnetic Propagation Characteristics and Equivalent Circuit Model
摘要
Abstract
Field distribution of electromagnetic wave propagating in a gas insulated switchgear (GIS) can be distorted locally at the discontinuous/abrupt positions like elbows, spacers and bushings. The effect of such distortion is usually regarded as a lumped circuit element inserted into the transmission line model. For L-type elbow of GIS pipe, bothπ-type and T-type equivalent circuits consisting of compensation capacitance and compensation inductance are investigated in this paper. Based on the two-port network parameter obtained by electromagnetic simulation of the L-shaped pipe, the formulae of both the compensation capacitance and inductance are derived by using transmission line theory. For a 1100kV GIS dimensions, the capacitance is about 15~32pF and the inductance is about 0.1~0.2μH when the T-type circuit adopted, and the capacitance is about 15~40pF and the inductance is about 0.08~0.23μH when theπ-type circuit adopted. Both the capacitance and the inductance are changing with the frequency. A circuit including a terminal load on one end of the L-shape pipe and a pulse voltage source on the other end is established to compare the difference between the two cases: with and without the equivalent circuit inserted. It is shown that, the equivalent circuit has obvious effect on the load voltage waveform when the load matches badly with the pipe, but has few influence when the two match with each other well.关键词
GIS/全波仿真/传输线方法/L型/补偿电容/补偿电感Key words
gas insulated switchgear (GIS)/full-wave simulation method/transmission line method/L-type/compensation capacitance/compensation inductance引用本文复制引用
曹书云,焦重庆..L型GIS管道对电磁波传播的影响及等效电路建模[J].电气技术,2016,(11):6-12,7.基金项目
国家重点基础研究发展计划项目（973计划）（2011CB209405）国家电网公司科技项目“特高压GIS变电站VFTO关键技术应用研究”资助 （）
