Scope:

This recommended practice applies only to two winding transformers covered by IEEE Std C57.12.00-20xx,IEEE Std C57.12.01-20xx, and NEMA ST20-1992. It does not apply to rectifier transformers. The WG will incorporate all information from the errata sheet and update as necessary.

Performance Subcommittee Chair:

Ramsis S. Girgis

ABB Power T&D Co.

4350 Semple Ave.

St. Louis, MO  63120-2241

U.S.A.

Phone: (314) 679-4803

Fax: (314) 679-4810

E-Mail: ramsis.girgis@us.abb.com

C57.110 Working Group Chair:

Richard P. Marek

DuPont AFS

5401 Jefferson Davis Highway

Richmond, VA  23234

U.S.A.

Phone: (804) 383 –2376

Fax: (804) 383 -2009

E-Mail: richard.p.marek@usa.dupont.com

C57.110 Working Group  Vice Chair:

N. Kent Haggerty

DuPont (Engineering)

1002 Industrial Road

Old Hickory, TN  37138

U.S.A.

Phone: (615) 847 -6873

Fax: (615) 847 -6897

E-Mail: N-Kent.Haggerty-1@usa.dupont.com

Status

Spring 2007 unapproved WG Minutes:  posted 10/12/07

Ballot Summary:  posted 10/12/07

Ballot Comments:  posted 10/12/07

C57.110 Draft 5:   posted 10/12/07  (password required for access)

3rd Harmonics

Waveform Synthesis Spreadsheet:  ,  Instructions: (both are password protected)

"Transformer Efficiency" Paper by Power Quality International    (166kB)

P. Hopkinson e-mail: 

"Loading Studies in Transformers," Rev. 5: (302kB)

"Cost and Benefits of Harmonic Current Reduction for Switch- Mode Power Supplies in a Commercial Office Building" - IEEE IAS Annual Meeting, October 1995, Orlando Florida.  Paper not provided here.

PQI Calculator:  (532kB)

• Testing

"Calculation of Ampacities and Sizing of Line and Neutral Conductors  in the Presence of Harmonics - by Ajit Hiranandani, Detroit Edison Company.   Paper not provided here.

Pacific Power Source of CA is developing the following white paper (initial draft), "Large Scale Use of Solid State AC Power Sources for Automated Transformer Testing,"  to advocate some of the advantages of using this technology for transformer testing:  

"Large Scale Use of Solid State AC Power Sources for Automated Transformer Testing," - Draft White paper by Pacific Power Source of CA:    (200kB)

The question was raised as to whether these power sources could be used to generate waveforms with varying harmonics.  Based on discussions, the equipment can very easily create waveforms with varying harmonic and/or ring content.  Pacific Power Source has a 1999 document, "UPC Interactive Add-In - SINE32.XLS," that addresses the process for creating waveform definition files, as well as, an Excel program, "UPC12/UPC32 Waveform Synthesis Spreadsheet," tool that creates the file.  These are copyright protected and cannot be provided here.  See the document below for contact information:

  Johnson e-mail document