The company successfully conducted three high-end converter transformer external pressure withstand and partial discharge tests at the State Grid ±1100kV Changji Station. This is the first case in the world. It can be seen that the requirements are high and the difficulty is great. At the same time, the company successfully completed the entire station. The low-frequency heating treatment of Taiwan's high-end converter transformers ensures the drying quality and the construction schedule of the whole station in winter. For this reason, Huadian became an instant hit in the State Grid UHV Construction Department and the State Grid System, and has been praised by the Super High Department Leaders Conference many times. . The technical level and reliable quality of Huadian's test equipment, the excellent technology, organization and coordination ability of the on-site team, and especially the work style that can endure hardships and fight, have been unanimously praised by the State Grid Super High Department and experts. Preparations for this mission began in July 2018, and experienced intense heat and cold, especially during the two-month period in winter, when the temperature dropped to more than minus 30 degrees, and the field was icy and snowy. , The work intensity and endurance of the testers have withstood severe tests.