WINDINGS

The winding will be made of rectangular or round section electric copper covered with several layers of age-resisting insulation paper or enamel coating of high dielectric strength. Sufficient cooling channels between windings will be provided and all winding will be constructed firmly to be sustained from external and internal mechanical stress.

CORE

The core is made exclusively of cold-rolled grain-oriented sheet coated with magnesium-silicate-phosphate insulation on both sides. To full utilize the grain orientation of the laminations, the ends of the limbs and yokes are mitred and stacked together by overlapping the laminations in pairs, which will reduce the no-load losses and thus the power required for magnetizing the core. The core will be rigidly clamped with positive locking devices to ensure adequate mechanical strength to support the winding and also to prevent shifting of lamination during transport and further to reduce vibration to minimum during operation.

CASE

The transformer will be enclosed in a suitably stiffened welded steel tank such that the transformer can be lifted and transported without permanent deformation or oil leakage. Lifting lug will be provided, suitable for the weight of the transformer, including core and windings, fitting, and with the tank filled with oil. The base of tank will be so designed that it is possible to move the complete transformer unit in any direction without injury when using skid base.