Dalian Insulator Group T&D Co., Ltd., was founded in 1915, is a high-tech enterprise specializing in the R&D, production and sales of all kinds of insulator products. Dalian Insulator Group was listed on the small and medium-sized board of Shenzhen Stock Exchange in August 2011. The company's main products include: 35 ~ 840kN AC and DC suspension porcelain insulators, 10 ~ 1000kV AC composite insulators, ± 500 ~ ± 1100kV DC composite insulators, post insulators / high-voltage hollow insulators for 10kV ~ 1000kV power stations and various electric equipments. The company has complete process equipment, advanced testing means, strict implementation of International Electrotechnical Commission (IEC) standards and Chinese, American, British and other standards, and perfect quality assurance system. Relying on its leading technical advantages and excellent management ability, the company has undertaken the supply tasks of a number of national and international key power transmission and distribution projects. So far, it has provided more than 8 million high-grade porcelain insulators for more than 20 UHV transmission projects such as "1000kV UHV AC transmission project", "800kV DC transmission project", "660kV DC transmission project" and "Three Gorges Project". Since the 1950s, over 30 million pieces of "Three-arrow” insulators have been transported abroad and have been operating safely and stably on transmission lines all over the world. The comprehensive output and sales volume are leading in a domestic Industry. The company has perfect research and development system, adequate talent echelon and rich technical reserves, it has successfully developed 420kN, 550kN, 840kN high-strength porcelain insulators and tookthe lead in developing composite insulators in China in 1985. In recent years, the company has won" Grand Prize of Science and Technology Progress in Machinery industry " for many times, "the first Prizefor National Science and Technology Progress" and "Grand Prize for National Science and Technology Processes" issued by the State Council, "Laboratory accreditation certificate of China National Accreditation Commission for conformity assessment (CNAs)" and many other honors.