Cold-rolled grain-oriented sheets in "Step-lap" lamination reduce no-load losses and no-load currents as well as noise emission.

• axial current distribution adjusts freely
• reduces shearing forces

After winding, the Prepreg is stuck over the conductor sheet to form a compact tube by a tempering process. The mechanical quality of the foil windings is controlled by observing the tube stiffness with the help of special testing equipment and in accordance with the force-distance diagram.

• fully and semi-automatic winding machines
• enamel-insulated winding wire with steady winding pull on carrier cylinder, or directly on the LV winding
• layer insulation of high-quality cable paper
• covering bandage made of shrinking foil for compact winding with good short-circuit response and optimum impulse voltage distribution

• short-circuit proof assembly with profile steel and
• support of coils
• secure fixation of the electrical connections

The active part is securely joined to the cover and supported against the bottom of the tank.

• low frequency or solvent vapour drying
• filling of dried and degassed mineral oil

• corrugated tank up to 4 MVA manufactured in-house
• modern folding facility processes the steel sheet into high-quality corrugated walls
• after the tank has been robot-welded, it is checked for leakage with control liquid and ultraviolet light.

The cover is made of doubling-free high-quality steel. It is bolted to the tank, and can also be welded to the tank on request. Besides bushings and lifting lugs the required control and monitoring devices are located on the cover.