Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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GIS盆式绝缘子作为缝隙天线的暂态电磁辐射特性研究

来源:电工电气发布时间:2020-01-21 09:21 浏览次数:68
GIS盆式绝缘子作为缝隙天线的暂态电磁辐射特性研究
 
谭向宇,赵现平,王科,聂永杰,彭晶
(云南电网有限责任公司电力科学研究院,云南 昆明 650217)
 
    摘 要:如果气体绝缘开关设备(GIS)内部存在快速暂态过电压(VFTO),电压电流波就会沿管线在GIS内部传播,并在绝缘子和套管等导体不连续处发生电磁辐射,使暂态电磁能量泄漏到外部空间,影响二次设备和系统的正常运行。通过将盆式绝缘子等效为GIS管壁上径向开槽的缝隙天线,理论和仿真研究了绝缘子的暂态电磁辐射特性。理论推导了缝隙天线的辐射过程,获得了空间电磁场的解析表达式。在全波电磁仿真软件中建立了GIS管线和绝缘子的仿真模型,计算了冲击激励下外部空间的时域电磁场波形。分别对空间电磁场的径向和轴向辐射特性进行了量化研究,结合理论推导分别采用反比例函数和辛格函数对仿真结果进行拟合。仿真结果和拟合函数计算具有很好的一致性。
    关键词:GIS;盆式绝缘子;暂态电磁辐射;缝隙天线;辐射方向图
    中图分类号:TM216      文献标识码:A      文章编号:1007-3175(2020)01-0021-03
 
Study on Transient Electromagnetic Radiation Characteristics of GIS Disc Spacers as Slot Antennas
 
TAN Xiang-yu, ZHAO Xian-ping, WANG Ke, NIE Yong-jie, PENG Jing
(Electric Power Research Institute, Yunnan Electric Power Grid Co., Ltd, Kunming 650217, China)
 
    Abstract: If there is a very fast transient over-voltage (VFTO) inside the gas insulated switchgear (GIS), the voltage and current waves will propagate along the pipeline inside the GIS, and electromagnetic radiation will occur at the discontinuity of the conductor such as insulators and insulating bushes, so that the transient electromagnetic energy leaks into the external space, affecting the normal operation of secondary equipment and systems.This paper studied on the transient electromagnetic radiation characteristics of insulators through theoretical and simulation approaches, regarding the disc spacer as the slot antenna along radial direction of the GIS pipe wall.The radiation process of the slot antenna was derived theoretically to obtain the analytical expression of the space electromagnetic field.The simulation model of GIS pipeline and insulator was established in the full-wave electromagnetic simulation software, to calculate the time-domain electromagnetic field waveform of the external space under impact excitation.This paper respectively quantified the radial and axial direction radiation characteristics of the space electromagnetic field.Combined with the theoretical derivation, the inverse proportional function and Sinc function were used to fit the simulation results. The simulation results and the fitting function calculations have good consistency.
    Key words: gas insulated switchgear; disc spacer; transient electromagnetic radiation; slot antenna; radiation pattern
 
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