10 kV浇注支柱式电流互感器电场有限元分析及结构优化设计

浇注支柱式电流互感器是电力系统中用于测量、控制和保护的重要设备.以LZZBJ9-10B型浇注支柱式电流互感器为例,通过ANSOFT Maxwell软件对互感器内部进行三维电场仿真分析.研究结果表明,互感器内部电场集中分布区域在一次绕组的4个端角和二次绕组的左右两端,对一、二次绕组电场进行局部二维分析,得到绕组电场强度最大值和最小值的分布点的位置,提出通过改变绝缘挡板的厚度避免主绝缘材料因电场分布不均匀而发生局部放电的有效措施,并运用ANSOFT Maxwell软件进行电场分析得到验证.研究结果为10 kV浇注支柱式电流互感器的结构优化设计和安全运行提供了依据.

Finite Element Analysis of Electric Field of 10 kV Cast Pillar Current Transformer and Optimized Design for Its Structure

Cast pillar current transformers are important devices for measurement, control and protection in power systems. In this paper, the LZZBJ9-10B type cast-type current transformer is taken as an example, and three-dimensional electric field simulation analysis of its interior is carried out by the ANSOFT Maxwell software. The results show that the electric field concentrated distribution areas of the transformer are at the four end angles of the primary winding and the left and right ends of the secondary winding. The electric fields of the primary and the left secondary windings are subjected to local two-dimensional analysis to obtain the position of the distribution point of the maximum and minimum electric field strength of the windings. The authors propose that the thickness of the insulating baffle be changed to avoid partial discharge of the main insulating material resulting from uneven electric field distribution in it, and this proposal is verified by electric field analysis using the ANSOFT Maxwell software. The research results provide a basis for the structural optimization design and safe operation of the 10 kV cast pillar current transformer.