The transformer tanks (lower pan and side walls) and top cover are made by using black sheet metal with high quality which is electrically welded. Cooling surfaces of distribution transformers up to 4000kVA consist of corrugated walls and these walls also form sides of transformer tank while for the bigger transformer radiators are used instead of corrugated wall panels.

After welding, each tank should be subjected to oil-leakage test (pressure test) that’s why the pressure is applied to every tank after production. The pressure is designed to have a vacuum resistance of 0.35 bar for corrugated wall and 1 bar for transformers with radiators. All surfaces of the tank to get in contact with oil are cleaned by sanding and special chemical cleaning methods for surface preparation prior to painting. Tanks and top covers finished are sandblasted according to the DIN standards. If the customer has special requirements or various demands for sandblasting, our company has facilities to meet these.

Top Cover arrangement is created according to the contract or customer demand and all connection elements on the top cover and High Voltage bushing arching horns are made of stainless or anti-corrosive special coated material.