GIS浇注孔的尺寸与局部放电辐射出的UHF电磁波强度的关系的研究

发布时间：2018-05-02 19:08

本文选题：气体绝缘开关设备 + 局部放电　；参考：《电工技术学报》2014年S1期

【摘要】：不同厂家的GIS产品的浇注孔尺寸不一,由于开孔尺寸对局部放电产生的UHF电磁波信号会产生直接影响,造成很难对局部放电严重程度进行量化评估。本文以一252k V的GIS为平台,通过在盆式绝缘子上设置不同尺寸的浇注孔,利用安装在这些浇注孔上的传感器检测由GIS内部尖板局放源发出的电磁波信号,发现辐射出的信号强度随浇注孔长边长度的增加而先增大后减小,在长边长度为75mm时达到最大值。另外的模拟实验——通过脉冲信号源给安装在GIS腔体内的发射天线提供激励的方法来模拟局部放电,再通过同样的传感器检测UHF电磁波信号——也发现同样的结果。利用时域有限差分法,在电磁波仿真软件XFDTD中建立模型的计算结果也证明了这一结果。此结论为GIS浇注孔最优尺寸的选取和外置式UHF传感器的研制提供了参考。
[Abstract]:The size of pouring holes in GIS products from different manufacturers is different. Due to the direct influence of the size of opening holes on the UHF electromagnetic wave signal generated by partial discharge, it is difficult to quantitatively evaluate the severity of partial discharge. In this paper, a 252kV GIS is used as a platform to detect the electromagnetic wave signal from the partial discharge source of the GIS inner tip plate by setting different sizes of pouring holes on the basin insulator, using the sensor installed on these pouring holes. It is found that the radiated signal intensity increases first and then decreases with the increase of the long side length of the pouring hole, and reaches the maximum when the long edge length is 75mm. Another simulation experiment, the method of exciting the emitter antenna installed in GIS cavity by pulse signal source, is used to simulate partial discharge, and the same result is also found by detecting UHF electromagnetic wave signal by the same sensor. By using the finite-difference time-domain method, the calculation results of modeling in the electromagnetic wave simulation software XFDTD also prove this result. The conclusion provides a reference for the selection of optimal size of GIS pouring hole and the development of external UHF sensor.
【作者单位】：华中科技大学强电磁工程与新技术国家重点实验室;广东电网公司电力科学研究院;
【基金】：国家自然基金资助项目(50877073)
【分类号】：TM595

【相似文献】