Microwave Detection Technology for Internal Defects of Composite Post Insulators - Jiang, Huaiyuan; Mei, Hongwei; Zou, Xiaobing; Li, Lanxin; Wang, Liming (2020 International Symposium on Electrical Insulating Materials (ISEIM), Electrical Insulating Materials (ISEIM), 2020 International Symposium on, 2020)