国力电子：真空交流接触器、真空开关管等核心产品已广泛应用于柔直输配电及特高压领域

Group 1 - The company, Guoli Electronics, has core products such as vacuum circuit breakers and vacuum switch tubes that are widely used in flexible direct current transmission and ultra-high voltage fields [1] - The company is involved in ultra-high voltage engineering projects, including the East China Sea converter station and the Southeast Tibet ultra-high voltage direct current transmission project [1]