The world’s first 550 kV perfluoroisobutylene environmentally friendly gas-insulated metal-clad transmission conduit (GIL) has been successfully put into operation
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Recently, the world’s first 550 kV perfluoroisobutylene environmentally friendly gas-insulated metal-clad transmission conduit (GIL), developed independently by Pinggao Electric Co., Ltd. in collaboration with the China Electric Power Research Institute and State Grid Anhui Electric Power, was successfully put into operation at the 500 kV Rongsheng Substation project in Anqing, Anhui. In this project, a mixture of perfluoroisobutylene-based environmentally friendly gas produced by Fujian Sanming Haisufu Chemical Co., Ltd. and carbon dioxide is used as the insulating medium for transmission line equipment. Through collaborative efforts by Pinggao Electric, the China Electric Power Research Institute, State Grid Anhui Electric Power, and other organizations, key technologies related to the insulation of transmission line equipment and temperature control using this perfluoroisobutylene-based environmentally friendly gas were successfully developed, resulting in the creation of 550 kV GIL equipment utilizing this gas. In November 2024, the Ministry of Ecology and Environment announced the approval results for the 11th batch of regular registration certificates for the environmental management of new chemical substances, and Hayesford Company received approval for the regular registration certificate for perfluoroisobutyronitrile. It is reported that this technology reduces the greenhouse effect by 97% compared to sulfur hexafluoride, and achieves \"the same dimensions, parameters, and performance\" as conventional 550 kV sulfur hexafluoride gas-insulated transmission lines. It is compatible with both sulfur hexafluoride and sulfur hexafluoride/nitrogen mixtures, offering excellent solutions for the retrofitting of existing power plants as well as the construction of new ones. This contributes to advancing the environmental-friendly upgrading of power grid transmission and transformation equipment in China to a higher level.
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