In distribution and power transformers, windings are made of two components conductor and the insulation materials both provide maximum strength to axial and radial forces and increases the resistance of the winding against overvoltage impulses. LV (low voltage) windings are generally from a foil or paper insulated flat conductor. HV (high voltage) windings are however an enamel insulated round wire conductor or a paper insulated round or flat conductor. Copper or Aluminium conductor is used in the transformer windings. Whether the conductive material is copper, or aluminium varies accordingly to the current, voltage, specifications of the respective country and customer requirements. In between the layers of a coil, a special insulating material with increased insulation and high oil absorption is used, such as a craft paper, shellac paper (DDP, DPP) roll pressboards, etc. and this method provides gap-free, solid, coils with excellent properties. All components of insulation are made from electrical grade insulating board; processed to ensure electrical and mechanical stability throughout the temperatures found in operational service. High technology with modern winding machines and manufacturing with qualified technicians ensure that each winding is able to withstand the excessive axial forces, which may result from external sources.