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Windings

Windings

 

 

The windings are pressed, dried under constant pressure, oil-impregnated, exactly measured and, if required, readjusted geometrically. After thermal and mechanical stabilization of windings, they are assembled in order to form one phase of the transformer. The windings are made of coils concentrically arranged and insulated towards the core and the adjacent coils by transformerboard barriers produced by Weidmann Switzerland. They are cylindrically shaped and they are made of conductors of high purity electrolytic copper, paper or enamel insulated. The windings are constructed to meet the requirements with regard to the voltage ratio, mechanical resistance to short-circuit forces, permissible temperature rise and test voltages.

Windings made of disc coils are preferred for high voltages. Continuous disc windings are made of several numbers of equal coils or sections connected in series and is characterized by a high mechanical stability and operational reliability. Continuous winding of the disc coils reduces the soldering points to a minimum. Manufacturing takes place on vertical and horizontal winding banks. Precise control systems provide for constant pressure and winding pull.Depending on the necessary rating and voltage of the specific application are used various winding types such as disc continuously wound type, spiral, layer type.

For low voltages, the use of layer windings has proven successful. They consist of cylinder coils which are concentrically arranged one above the other and separated via axial oil ducts.

The windings are pressed, dried under constant pressure, oil-impregnated, exactly measured and, if required, readjusted geometrically. After thermal and mechanical stabilization of windings, they are assembled in order to form one phase of the transformer. They are clamped between special laminated wooden plates, enabling simple installation of windings on the magnetic core limbs.