Changsha Guotong Electrical Technology Co., Ltd is a professional company which specialized in electric power system automation product development, design, production, sales and related engineering implementation and services, at the same time provide the overall solution of electric power automation system, engaged in the transformer substation, power plants, microcomputer protection of hydropower station and unattended integrated automation system research and development, manufacturing, whole set, sales and after-sales service.

The company is located in Lugu national industrial park of Changsha high-tech development zone, covers an area of 60 mu, the production and office area is 20000 square meters. Company lays science and technology, quality, technology, services for the fulcrum of development, with series products, systematic technical applications, multi-level and continuing to meet the needs of power automation users as the goal.

Since the company's establishment, which has been more than tens of thousands of sets of microcomputer monitoring and protection device or system put into operation in many industries. On the basis of successful operation experience for many years of the procducts, combined with domestic and foreign theory of relay protection, computer technology, automatic control technology and the new development of communication technology, has launched a new generation with GT640 type protection unit as the core technology of GT6000 series microcomputer monitoring protection system as well as GT840 GT8000 unit as the core series microcomputer monitoring and protection system, more embodies the design thought that microcomputerization of protective monitoring function and modularized software and hardware. The launch of this series products, further simplifies design, installation, commissioning work of the system, improved the operation, maintenance and management level, enhanced the function of communication, measurement and management, created a new level of safe, stable and reliable operation for the microcomputer-based secondary equipment. After several years of development, the company formed a modern enterprise management system with technology and quality as the guide, service and marketing as the center, with capital and talent as the main body, and has become a well-known high-tech enterprise in domestic power system automation industries.