The device has high efficiency, strong and durable, suitable for large transformerinternal operations, to ensure the safety of operating personnel. The low temperature dry air into the transformer, high drying at the same time, can prevent the intrusion of external air, avoid internal operations personnel with sweatconductive and hypoxia. Its characteristic is every 5 minutes, automatic alternatelydehumidification, regeneration. The general absorber used without using a heater,through the export of dry air from 15 to 20% after the roundabout renewable use.Consumption of this device can control the regeneration air below 15%. The SD series device processing capacity: from 500 L / min to 3000 L / min can be chosen,the basic model: SD005SR (30m3/h) /SD010SR (60m3/h) /SD020SR (120m3/h) in which SD005SR technical parameters: the export of dew point can reach 50 DEG C, dry air outlet 500L / min (equivalent to 30m3/h), the outlet air pressure 0.1-0.3Mpa the operating pressure of 0.7 11KW or 0.8Mpa, the compressor power,generator internal absorbent has a zeolite, such as oxidation alumina, activated alumina, size of 1700L * 1700W * 1800Hmm, the weight is about 1200kg.