Use the following information as a handy reference when selecting and applying dry type transformers within your environment.

Minimum data needed to select a transformer:

Minimum data needed to select a transformer:

  • Load voltage (secondary voltage)
  • Load requirement
  • Three-phase (three wire or four wire)
  • Single-phase (two wire or three wire)
  • (load always determines phase of transformer)
  • Load current (use table to convert to kVA or formula)
  • Single-phase formula: Volts x Current = VA
  • Three-phase formula: Volts x Current x ?3
  • System voltage and frequency (primary voltage)
  • Mounting location

Specific applications:

  • Feeding distribution panel
  • Feeding distribution panel with harmonic content
  • Non-linear energy efficient transformer
  • Feeding multiple distribution panels with harmonic content
  • Harmonic mitigation energy efficient transformers
  • Small change in voltage