Technical Design and Engineering
All power transformers use circular, stacked step-lap cores. A range of winding types are used including layer for smaller power transformers, helix, multi-start helix tapping windings to reduce short circuit forces, and disc windings for larger power transformers.
Distribution transformers use proven non-circular wound or stacked step-lap cores to optimise performance and cost. For other than small distribution transformers and transformers with higher secondary voltages, the low voltage windings use sheet conductor to achieve high axial short circuit strength. The high voltage winding are of multi-layer construction. Epoxy diamond dot insulation is used throughout the windings, which when cured, contributes to achieving high short strength products