AD Air Dryer is designed to provide high-purity dry air with dew point as low as -55 ° C to -70 ° C for electric power equipment such as High voltage transformers, ultra-high voltage transformers, and electric reactors during installation and maintenance. Removes moisture and particulates from the air. It can replace traditional drying methods such as hot oil circulation, nitrogen supplement and vacuum. It is more efficient, economical, safe and environmentally friendly. When using Air dryer for equipment maintenance, they are not affected by changes in external weather conditions, especially overnight operations, Just seal the flanges everywhere and fill with dry air 0.02Mpa-0.03MPa, no need for oil injection. electric equipment will not get wet, reducing the daily pumping and oiling workload, to achieve the effect of shortening the maintenance period and improving the quality of maintenance. During the oil filtration process, the tank and oil of the oil injection equipment can be aerated and dried to improve the oil filtration efficiency. When it is idle, it can be used as indoor air conditioning on the construction site.