Brownell's Re-Actrans transformer breathers are self-reactivating to eliminate the need for periodic desiccant replacement on power and distribution transformers up to 500MVA, with low intermittent power consumption and simple installation combined with no moving parts and minimum maintenance.

Desiccant self-regeneration is accomplished using the transformer's natural thermal cycle. An outward flow of air comes from the increasing plant temperature and an integral pressure switch detects the resultant pressure change to power the proportional control thermal heaters and power circuit to manage the reactivation process, thereby maintaining the highest desiccant adsorption capacity.

The transformer temperature increases can result from an ambient change, solar heater or transformer duty loading - and, in some cases, all three acting collectively.

There are two Re-Actrans models for oil capacities up to 25,000 litres and transformer power ratings up to 30MVA or capacities up to 125,000 litres with ratings of 30-500MVa. With 3.5A and 7A maximum power consumption respectively, they both use silica gel desiccant, have humidity saturation indicator windows and are protected to IP65.

Re-Actrans transformer breathers