Moisture Holders
Moisture Holders Type NAK 1,2kg bis 4,8kg (DIN 42562)
- All the flanges are GG-14 casting and coated with a special wet paint having high resistance to corrosion. The upper connection flange (Item-5) and its pipe are made of St 37 material.
- Container cylinder and oil bowl is made of glass. The oil bowl dome can be Ms 63 brass or aluminum depending on the request.
- The sieves are made of zinc sheet.
- The butterfly nuts are forged CrNi material.
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Operation principle
When the transformer gets air in, an air flow from and to the oil bowl occurs. The oil layer in the bowl prevents the dryer material from continuous contact with the damp external air and cleans the air flowing in. If the operation temperature of the transformer decreases, the volume of the isolation oil gets smaller. During this lessening, an amount of air equal to the lessening amount is absorbed into the oil bowl through air holes. This air then transfers to the expansion vessel and contacts with the oil layer. During this transfer, air contacts with the dryer material and leaves its moisture there. With the heating of the oil in the transformer tank, the air inside flows out from the opposite direction of the moisture holder.
Capacities
In the selection of the size of the moisture holders, various factors such as oil volume in the transformer, required life of the silica gel charge, operating cycle of the transformer, temperature and moisture content of the ambient air should be taken into consideration by the transformer designer.
Suitable for this
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