Design requirements for a Power Transformers :

• Typical minimum requirements to be specified for a Power Transformer are:
  • Power rating in VA.
  • Frequency usually 60 Hz.
  • Number of primary windings.
  • Number of secondary windings.
  • Operating voltages levels.
  • Operating current levels
  • Operating frequency is needed for core calculations and wire sizing.
• Core material is selected for the known operating frequency or frequencies which is typically silicon steel laminations.
• Other Power transformer design considerations are space limitations and mounting technique.
• Lead terminations are also specified through the design of a Power Transformer.

Power transformer designs vary widely in terms of power rating, voltage and current levels (turns ratios), operating frequency, size, impedance, bandwidth (frequency response), winding and other parameters.