In April 2013, "ZN91-40.5" wind power circuit breaker produced by Fuzhou Tianyu Electric Co., Ltd. successfully passed the low temperature test (-40 ℃) in "Fujian Institute of Product Quality Inspection and Research". Wind power is the most mature technology for developing and utilizing green renewable energy and has become an important part of China's energy development strategy. However, the natural environment conditions of wind farms are often harsh. In our country, a large number of wind farms are concentrated in the wind energy-rich Inner Mongolia Prairie and the western deserts. In winter, the arctic temperature can be reduced to -40 ° C, 35kV indoor circuit breakers that can be delivered to the center substation line face enormous challenges. For ordinary indoor circuit breaker products, only -5 ℃ above the ambient temperature of normal work, even the highest level of the lowest temperature products can only work at -25 ℃ above the ambient temperature (GB highest level - 25 ° C). As a result, indoor products used in the north tend to require heating (heating) equipment inside the house, whereas un-delivered distribution rooms often fail to provide heating power, and many wind farms often do not have heating equipment to reduce operating costs Urgent need to be able to adapt to indoor conditions of the circuit breaker products. However, at present, almost no domestic manufacturers can produce suitable for less than -25 ℃ ambient temperature 35kV indoor circuit breaker products, our technical personnel through repeated experimental studies, through the different materials, transmission and lubricating medium circuit breaker temperature Performance of the repeated comparison and study, and ultimately find a more ideal solution to the successful solution to the problem of low temperature products, to fill the -40 ℃ domestic indoor circuit breaker products in the blank for the arctic areas of the user provides A high-performance product. At present, the product has been successfully applied in the "China Power United Power (Shanxi Yanmenguan)", "State Power Laoting" and other projects. Metal Welding,Welding Part,Welded Metal Part Olym Metal Products Co., Ltd. , http://www.china-steel-casting.com