DYH.DYH is a group enterprise founded in 1972 and headquartered in Pulandian District, Dalian, specializing in the manufacturing of power transmission and distribution equipment. The company occupies a total area of 380,000 square meters and employs over 1,800 staff members. As a leading enterprise in China's instrument transformer industry, its core business encompasses the R&D, manufacturing, and marketing of high-voltage and medium-voltage instrument transformers, insulated busbars, and related products. Operating under a group structure, the company maintains manufacturing facilities at its Dalian headquarters and subsidiaries in Shanghai, Xiamen, and other locations. It also established a joint venture with Spain's Ataxi to specialize in the production and sales of high-end current and voltage transformers rated at 110kV and above. Its extensive product portfolio finds widespread application in power systems, rail transit (including electric locomotives and EMUs), and various switchgear cabinets, securing significant market influence.