The advantage of Hedian lies in its unique technology. Since its establishment, it has closely followed the pulse of China's railway development, adhered to independent research and development, scientific and technological innovation, actively introduced advanced technology at home and abroad, and worked closely with domestic universities and research institutions. Based on the framework of the on-line monitoring device of the large ground grid, the railway harmonic control and voltage stabilization system, the intelligent safety tool cabinet of railway power, and various detection devices of transformers, we have innovated and developed high-quality products that meet the needs of our customers, which have been widely used in a number of new and reconstruction projects of intelligent substations, and the market share of similar products in the country has reached more than 85%.