摘要
随着电力系统的快速发展,气体绝缘变电站(GIS)广泛应用于高压电力系统中。GIS变电站中的开关操作会产生强烈的瞬态空间电磁场,进而威胁到变电站中电子设备的电磁兼容性(EMC)。文中计算了GIS变电站中架空线路在开关过程中产生的空间电磁场。利用数值拟合法得到了开关操作过程中的快速暂态过电流,采用时域有限差分法(FDTD)计算了架空线路产生的暂态空间电磁场,未对接地管壳和绝缘套管等电力设备建模;分析了空间暂态电磁场随距离、时间、频率变化的情况,计算结果可为GIS变电站的电磁兼容设计提供参考。
Nowadays, with the fast development of power system, gas-insulated substation（GIS） has been widely used in high voltage power grids. Switching operations of disconnect switches radiate transient electromagnetic fields within GIS. As a result, the electromagnetic compatibility（EMC） problems of electronic equipments in GIS substations have to be considered. The electromagnetic（EM） fields generated by the transient currents through the overhead lines in a GIS are computed in this paper. The equation of the very fast transient currents（VFTC） generated during switching operation is obtained by numerical fitting, and a numerical model using a finite-difference time-domain（FDTD） technique is developed to compute the transient field emission considering the shielding effect of the grounded enclosure. The effects of EM field variations in different distances and frequencies are studied. The simulation results would give help to the EMC design of the electronic equipments in GIS.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第6期91-97,共7页
High Voltage Apparatus
基金
国家电网公司科技项目(GY71-11-050
GY71-14-036)~~
关键词
FDTD
GIS
VFTC
架空线路
电磁场
finite-difference time-domain（FDTD）
gas-insulated substation（GIS）
very fast transient currents（VFTC）
overhead line
electromagnetic field
