In recent years, China's direct current transmission technology has developed rapidly and reached the international leading level. Nearly 30 direct current transmission projects have been built, including nearly 20 UHV DC transmission projects. With the deepening of engineering construction and operation and maintenance, State Grid Corporation and China Southern Power Grid Corporation put forward higher requirements for the reliability of the hole sealing of the valve hall of the converter station. The sealing of the valve chamber hole not only plays the role of sealing and noise reduction. Moreover, it is easy to disassemble and disassemble in the actual operation and maintenance inspection. More importantly, in the case of fire, it is necessary to play a better role in explosion protection and fire prevention, to ensure the safety of personnel and equipment in the fire, and to minimize accident losses. .
Since Yunguang Engineering (China's first UHV DC transmission project), Shirui Group's Ruixin engineering team has provided a total of more than 30 converter stations to provide elevated hole sealing services, in the existing valve hall blocking program On the basis of the analysis, around the higher requirements of the power grid in terms of fire prevention and explosion protection, Ruixin Engineering has gathered a number of professionals in structural design, material research, process research and other fields to carry out integrated technology research and developed a second generation converter station. Valve hall sealing scheme.