Eco Gel Air Breathers

Eco Gel 3

Product Range

Eco Gel Air Breathers - Product Range

TypeGel Fill
H mm.D mm.FContainer
Approx. Daily
Thermal Breathing
vol. (m³)
Total Air
vol. Breathed
In Before
Reactivation (m³)
TV750,17ks. 700155821/2" - 3/8"0,240 dm³0,0062,6
E0.50,50ks, 15002501001/2" F0,65 dm³0,0156,9
E101,00ks. 35002451401" F1,35 dm³0,02912,5
E151,50ks. 50003001401" F2,00 dm³0,04016,1
E303,00ks. 100003701901+1/2" F4,00 dm³0,07827,5
E404,00ks. 180004701901+1/2" F3,00 dm³0,14047,5
E505,00ks. 220003852451+1/2" F6,70 dm³0,19061,0
E808,00ks. 280005352452" F10,70 dm³0,26596,5
E10010,00ks. 350006452452" F13,50 dm³0,310122


Description and General Specifications

Humidity and impurities reduce the dielectric rigidity of the transformer insulating oil and contribute to the forming process of smudges thus impairing the correct operation of the transformer itself. The intake air of transformers should therefore be filtered and dried dehumidified by means of an equipment specially designed for that purpose and called Eco Gel Air Breather.

Characteristics of Eco Gel

The above mentioned chemical agent for this equipment is a chemically pure eco gel. The quantity of water vapour adsorbed by the above gel depends by various factors among which the most important ones are: ambient air temperature and the relative humidity. At 100% relative humidity and at the temperature of 25°C (77°F) the gel adsorbs a water vapour quantity up to 40% of its own weight, and above these parameters the eco gel possesses no further adsorption possibilities. The saturation thus reached is evidenced by the colour change taking place in the gel during the adsorption process. From the original orange when the gel is dry, it turns dark brown when it is saturated. Ones saturated eco gel may be reactivated by submitting it to a drying process in a oven at 150-200°C until orange colour is reached.

Description of the Air Breather

This equipment consists of a hollow, medium thick plate transparent cylinder which contains the eco gel, of a stainless steel housing, flanged at its top and bottom ends with light aluminium alloy blank flanges provided with appropriate threaded openings and connected among them by means of screw bolts. The bottom flange is fitted with a removable tank which is filled, when ready for operation, with transformer oil up to about half the height of the oil level check glass. In this tank there is a hollow aluminium cylinder whose bottom end is immersed in the oil of the tank, while at its top end protrudes into the gel cylinder and is provided with a horizontal ring of holes. The compound oil tank and the hollow aluminium cylinder constitute a siphon, that is a hydraulic trap which prevents direct contact of the gel with the ambient air as long as the transformer operates at constant temperature. When suction takes place, air is admitted under filtering action into the transformer owing to the difference in pressure prevailing under such circumstances. Under inverse operating conditions, the excess air is exhausted by the same way bubbling through the oil. The intake air opening is located at the bottom of the equipment, thus avoiding all possibilities of rain water entering in it. There are several sizes of this equipment containing an eco gel quantity ranging from 0,5 to 10 Kg. The air intake opening is moreover fitted with a filter cartridge which prevents the entering into the equipment of whatsoever material. The threaded hole in the top flange of the breather consents the connection to the conservator oil suction pipe. All external parts of the breather are stove enamel finished, except the stainless steel part of the housing.

Operating Instructions and Maintenance

Setting to work – Operating instructions

  1. Remove the sealing tape closing the air passage holes;
  2. Fill the gel container with eco gel;
  3. Screw the air breather to the pipe going from the conservator;
  4. Remove the oil tank unscrewing the nuts at the bottom of the breather;
  5. Place oil in the oil tank up to half the height of the oil level windows;
  6. Replace the oil tank

Maintenance : reloading and reactivation of Eco Gel
When the dark brown colour of the indicator gel reached half-way up the container, the saturated charge should be replaced operating as follows :

  1. remove the oil tank of the air breather;
  2. unscrew the air breather and remove it;
  3. replace the saturated eco gel with the fully active one (all orange);
  4. put the breather back into operation;
  5. replace the oil tank;
  6. the saturated eco gel may be reactivated by uniformly distributing it on a thin sheet metal so that it is about 1″ (25mm.) thick, and then placing the sheet with eco gel in a ventilated oven at a temperature of about 150°C, until the eco gel become orange.

Oil level check
Periodically check the oil level through the oil level windows. If the oil is dirty, replace it.