Air dehydrating breathers for distribution transformers
|Transfomer oil suggested||700kg, 1500kg and 3500kg|
|Silicagel quantity||0,25kg, 0,50kg and 1kg|
|Connection type||Thereaded or flanged|
|Body in aluminum alloy casting|
|Standard references||EN 50216|
|Waterproof (IP65 protection degree)|
|Window material||Trogamid or tempered glass|
|Environmental conditions||from -60°C up to +70°C|
|Finishing for exreme/high corrosive environments|
Air dehydrating breathers are transparent hollow cylinder tubes which contain chemically pure silicium salt (silica gel) with a colored indicator.
The air flows inside the transformer due to the thermal contraction of the oil mass and passes through the silica gel; the silica gel absorbs the humidity, indicating the saturation degree by changing color.
The salt contained in the breather, when saturated, can be easily removed and replaced.
The upper and lower parts are made of a non-porous corrosion-proof aluminum alloy casting. The hollow cylinder is made of PMMA (or tempered glass) and is protected by a stainless-steel frame with windows that allow for the visual inspection of the silica gel color.
On the bottom side of the breather, a valve prevents continuous air contact with the silica gel and only allows air to pass in both directions (inlet or outlet) when there is a pressure deficiency or excess inside the transformer; in particular, TV75 /VE05 and VE10 models feature a hydraulic valve (oil sump) while VC10 models features a mechanical valve (spring-loaded).