With the increasing saturation of buildable land resources in large cities, the research of "indoorment, miniaturization and oil-free" of substations is of great significance to realize the coordinated development of substation construction and economic, social and ecological environment. Recently, Shenzhen Aodian High Voltage Electric Co., Ltd. released an innovative product - 220kV evaporative cooling power transformer. As the key to promoting the implementation of the "embedded attached substation" project, the new power transformer will realize the construction of substations in high-density urban centers.

According to reports, the 220kV evaporative cooling power transformer adopts a new fluorocarbon material as an insulating cooling medium, which has no flash point, no combustion or explosion, and realizes the integration of fire protection, environmental protection and heat dissipation. "Compared with previous products, this product has a higher voltage level, sets a new high capacity for non-combustible power transformers, and is more energy-efficient, environmentally friendly and efficient." Xiao Xia, chairman of Shenzhen Aodian High Voltage Electric Co., Ltd., said that the product research and development took 5 years and broke through a series of core technical key problems. Among them, Shenzhen has provided a good environment for innovative technologies.

Li Hanming, former deputy chief engineer of Shenzhen Power Supply Bureau Co., Ltd., believes that the 220kV evaporative cooling power transformer is a landmark breakthrough product in the history of power transformer technology development. On the one hand, it can eliminate power transformer fire and explosion accidents and protect people's lives and property; On the other hand, evaporative cooling power transformers can be "embedded" into office areas, production areas and living areas, greatly saving urban land space.

The Guangdong-Hong Kong-Macao Greater Bay Area is a contiguous and densely populated area, with huge demand for electricity. Taking Shenzhen as an example, in 2019, Shenzhen's power load reached 19.1 million kilowatts, ranking first in the country. Shenzhen has about 270 substations, and more than 100 will be built in the future, covering a huge area according to conventional construction. It is estimated that if the embedded attached substation is replaced, more than ten substations can be reduced in Guangming District of Shenzhen alone.

Jia Xingdong, director of Shenzhen Municipal Bureau of Industry and Information Technology, said that in many large cities, due to the increasing saturation of buildable land resources, promoting the construction of embedded attached substations is of great significance to improve the comprehensive development benefits of land and the coordinated development of the economic and social ecological environment.