CYG Insulator helped put Changji Guquan ± 1100 kV UHV DC transmission project into operation. Changji-Guquan ± 1100 kV UHV DC transmission project is currently the world's highest voltage level, largest transmission capacity, farthest transmission distance, and most advanced UHV transmission project. This project is an important milestone for the continuous innovation of the State Grid in the field of UHV transmission, refreshing a new height in world power grid technology, and opening a new era in the development of UHV transmission technology, It has a significant demonstration role for the development of the global energy internet.