IEEE C57.110 : 2008

1 Overview
  1.1 Scope
  1.2 Purpose
2 Normative references
3 General considerations
  3.1 Transformer losses
  3.2 Transformer capability equivalent
  3.3 Basic data
  3.4 Transformer per-unit losses
  3.5 Transformer losses at measured currents
  3.6 Harmonic loss factorPT for winding eddy currents
  3.7 Harmonic loss factor for other stray losses
4 Design considerations for new transformer specification
  4.1 Harmonic current filtering
  4.2 Impact on the neutral
  4.3 Power factor correction equipment
  4.4 Electrostatic ground shields
  4.5 Design consideration outside the windings
  4.6 Harmonic spectrum analysis
  4.7 Design consideration in the windings
5 Recommended procedures for evaluating the load capability of
  existing transformers
  5.1 Transformer capability equivalent calculation using design
      eddy-current loss data
  5.2 Transformer capability equivalent calculation using data
      available from certified test report
  5.3 Typical calculations for dry-type transformers
  5.4 Typical calculations for liquid-filled transformers
  5.5 Neutral bus capability for nonsinusoidal load currents
      that include third harmonic components
Annex A (informative) Bibliography
Annex B (informative) Comparison of UL K-factor definition and
        IEEE C57.110 harmonic loss factor definition
      B.1 UL Definition of K-factor
      B.2 Relationship between K-factor and harmonic loss factor
      B.3 Example calculations
Annex C (informative) Temperature rise testing procedures
      C.1 Preferred method of performing a temperature rise test
      C.2 Alternative simulated load temperature rise testing
          procedures
Annex D (informative) Tutorial discussion of transformer
        losses and the effect of harmonic currents on
        these losses

Pertains only to two winding transformers covered by IEEE Std C57.12.00, IEEE Std C57.12.01, and NEMA ST20.