IEEE C57.110-2008 REDLINE
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
IEEE Recommended Practice for Establishing Liquid-Filled and Dry-Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents
10-29-2018
English
08-15-2008
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
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.