With the increasing saturation of construction land resources in big cities, the research on "indoor, miniaturization and oil-free" of substation is of great significance for 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 promote the implementation of the project of "embedded auxiliary substation", the new power transformer will realize the construction of substation in high-density urban center.

According to the introduction, 220kV evaporative cooling power transformer adopts new fluorocarbon materials as insulation cooling medium, which has no flash point, no combustion and explosion, and realizes the integration of fire protection, environmental protection and heat dissipation. "Compared with previous products, this product has a higher voltage level, a new capacity of non combustible power transformer, and is more energy-saving, more environmentally friendly and more efficient." Xiao Xia, chairman of the board of Shenzhen aodian High Voltage Electric Co., Ltd., said that the research and development of the product lasted for five years, breaking through a series of key technical problems. Among them, Shenzhen has played a great role in providing a good environment for innovative technology.

Li Hanming, former deputy chief engineer of Shenzhen Power Supply Bureau Co., Ltd., believes that 220kV evaporative cooling power transformer is a breakthrough product with milestone significance in the development history of power transformer science and technology. On the one hand, it can put an end to the fire and explosion accidents of power transformers and ensure the safety of people's lives and properties; on the other hand, evaporative cooling power transformers can be embedded into office areas, production areas and living areas, greatly saving urban land space.

Guangdong, Hong Kong and Macao Bay area is contiguous, densely populated, and has a huge demand for electricity. Taking Shenzhen as an example, the power load of Shenzhen will reach 19.1 million kilowatts in 2019, ranking first in China. There are about 270 substations in Shenzhen, and more than 100 more will be built in the future. It is estimated that more than 10 substations can be reduced in Guangming District of Shenzhen if embedded auxiliary substations are used instead.

Jia Xingdong, director of Shenzhen Municipal Bureau of industry and information technology, said that in many big cities, due to the increasing saturation of construction land resources, it is of great significance to promote the construction of embedded auxiliary substation for improving the comprehensive land development efficiency and coordinated development of economic, social and ecological environment