In China’s large and medium-sized cities

according to the requirements of China’s fire protection authorities

SF6 gas transformers are required for substations embedded in office buildings

commercial complexes and other buildings. At present

the cooling mode of main transformer is natural air cooling and heat dissipation. The main transformer room is equipped with mechanical exhaust fan

which will generate the ventilation dead zone in the main transformer room

and the indoor temperature is too high

which is not conducive to operation and maintenance and personnel work. This paper presents a way of using air-water cooler to change the heat exchange mode of the main transformer

reduce the number of heat exchanges

improve the heat exchange efficiency

and improve the heat dissipation effect of the main transformer.