U.S. National Committee of the International Electrotechnical Commission,

A Committee of the American National Standards Institute

Technical Advisory Group for IEC TC 14

TAG Administrator:

National Electrical Manufacturers Association

1300 North 17th Street, Suite 1752, Rosslyn, VA 22209

Tel: 703-841-3252, fax: 703-841-3353

------MINUTES

PLACE OF MEETING:The Westin Charlotte

601 South College Street

Charlotte, North Carolina

DATE AND TIME:Monday, March 17, 2008

8:00AM

PRESIDING OFFICER:P. Hopkinson, Technical Advisor

Members Present:
S. Choinski / NEMA Staff, TAG Administrator
C. Colopy / Cooper Power Systems
J. Foldi / Foldi & Associates
P. Hopkinson / Hvolt, Inc., TA
S. Kennedy / Niagara Transformer Corporation
R. Marek / Dupont Advanced Fibers Systems
H.J. Sim / Waukesha Electric Systems
Members Absent:
J. Corkran / Cooper Power Systems
D. Foster / Foster Magnetics
R. Girgis / ABB
J. Lackey / PowerNex Associates Inc
G. Morehart / ACME Electric Corporation
P. Powell / PEPCO
B. Simpson / Innovative Paper Technologies
Others present:
L. Bayardo / GE Prolec
R. Benson / Buckingham
B. Cain / Itron
A. Cancino / IEM-Mexico
J. Caskey / NEMA
D. Cherry / ABB
J. C. Cruz Valdes / GE Prolec
J. Haasz / IEEE
K. Hanus / Texas Utilities
A. D. Kline / Consultant
N. McQuin / McQuin Electrical Power Consulting
H. Nordman / ABB Oy, Transformers
T. Prevost / Weidmann-ACTI
D. Purohit / ACME Electric
G. Reitter / Consultant
M. Sampat / EMS Consulting
V. Vailoor / Trantech
D. Vir / Waukesha Electric Systems
L. Wagenaar / WagenTrans Consulting
  1. CALL TO ORDER

The meeting was called to order, meeting guidelines reviewed and attendance recorded.

  1. APPROVAL OF THE AGENDA

A discussion of Dual Logo and Cat D liaison was added to the Agenda. The Agenda was approved as modified.

  1. APPROVAL OF THE PREVIOUS MINUTES

Minutes of the meeting held October 15, 2007 in Minneapolis, MN, were approved as modified:

The date of the meeting was corrected.

The spelling for Loren Wagenaar’s name was corrected.

  1. REVIEW AND UPDATE OF USNC ROSTERS FOR TC 14

A roster was circulated and corrections were annotated.

  1. DUAL LOGO AND CAT D LIAISON – J. Haasz

C57.15, Step Voltage Regulators is a candidate for Dual Logo. Craig Colopy has done a lot of work on the standard. The reference section was cleaned up and the IEC Central Office is pleased with the result.

The Joint Development Agreement should be completed before the next Transformer Committee meeting in October. The Switchgear Committee is the first to use it for C37.60. There are 20 IEEE members on the Joint Development Working Group, so no US experts were nominated for the WG.

Tom Prevost suggested the establishment of a Cat D liaison with IEC TC14. Craig Colopy worked on the Tap Changer standard in IEEE and then worked on it in IEC. Time and effort for these tasks may have been minimized through a Cat D liaison.

Cat D liaison is a formal liaison between IEEE and a specific IEC TC working group, and facilitates sharing of information. There is no US participation in MT6 working on IEC 60076-2. Hasse Nordman is a member of MT6 and is also an IEEE member. Work is underway in on convertor transformers and Sheldon Kennedy did a lot of work on the standard earlier.

A review of the program of work of IEC TC14 should be conducted to determine which projects IEEE has an interest in. A proposal would be made to AdCom to establish Cat D liaisons to those WGs/MTs. It was noted that the USTAG is not a formal committee within IEEE. A TF was appointed consisting of Rick Marek, Hasse Nordman, Craig Colopy, Sheldon Kennedy, Alvaro Cancino, Joe Foldi and Jin Sim.

Ms. Haasz to distribute Cat D rules to the TAG. Inviting the IEC Technical Officer may be useful as well as Ken Gettman’s (NEMA) presentation on Dual Logo he gave to IEC SC17A/17C.

  1. MT-4 REVISION OF IEC/TS 60076-14 – POWER TRANSFORMERS PART 14: Design and application of liquid-immersed power transformers using high-temperature insulation materials. R. Marek, Convenor

Currently at CD and comments due March 21. Pat McShane to provide comments on natural ester fluid.

Aging rate between natural ester/cellulose and mineral oil/cellulose are different.

Phil Hopkinson to obtain ABB paper for circulation to TAG.

Overload requirements were discussed. 20,000 hours is a trigger point for thermal index, however there is a mathematical problem getting from 20,000 hours to 180,000 hours. IEEE resolves this through a statement in the forward that says based on a 20 year service life, 180,000 hours is expected. MT27 is still trying to resolve the issue.

  1. MT5 REVISION OF IEC 60076-1 – POWER TRANSFORMERS - PART 1: General. P. Hopkinson, Convenor

Currently at CD. Meetings held in December (Rome) and February (Rosslyn) to address all the comments received. A second CD is being prepared for circulation.

  1. MT6 REVISION OF IEC 60076-2 – POWER TRANSFORMERS - PART 2: Temperature rise for oil-immersed transformers. A. Bossi, Convenor

Currently at CD. Hasse Norman reported on the following changes:

Thermally upgraded paper was introduced.

Hotspot winding rise – calculation vs. fiber optic measurement

Table for different ambient temperatures throughout the world.

Informative annexes added.

A meeting will be held in the spring to review Mr. Bossi’s proposed resolutions to the outstanding comments and a CDV is planned to be issued this summer.

A majority of the attendees departed at 9:30 am due to other meeting commitments.

  1. MT7 REVISION OF CONVERTOR TRANSFORMERS – PART 1: Transformers for industrial applications. U. Piovan, Convenor

Currently at CD. Comments due May 23. For the prior edition, the US submitted a comment about an error in a calculation that was rejected. Sheldon Kennedy did a lot of work on this standard earlier.

  1. MT 27 REVISION OF IEC 60076-12 – POWER TRANSFORMERS - PART 12: Loading guide for dry-type power transformers. M. Sacotte, Convenor

CDV approved. To be circulated as FDIS

  1. WG31 IEC 60076-16 - POWER TRANSFORMERS - PART 16: Transformers for wind turbines applications. M. Sacotte, Convenor

Currently at NP. WG has met several times, but there are too many people attending the meetings. New dielectric tests were proposed, but nothing has happened yet.

Issues with transformers located in the nacelle (vs. on the ground) and with the environment (offshore).

  1. IEC 60076-15 Ed.1: Power transformers - Part 15: Gas-filled power transformers

FDIS approved, standard to be published.

  1. 2008 PLENARY MEETING

Meeting likely to be held during IEC General Meeting in Sao Paolo, Brazil. The Meeting is scheduled November 17-21. It is not clear if TC14 will receive an invitation. If no invitation, TC14 will be looking for a host. The US previously offered to host the meetings in Milwaukee.

Jim Fyvie is likely to step down as Chairman after the next meeting. The UK is likely to nominate another UK Chairman, possibly Paul Jarman.

  1. OTHER BUSINESS

Companies are starting to specify IEC tests for partial discharge testing. Chuck Johnson is to ask for an extension for reaffirmation of the C57 standard so there could be harmonization.

15.DATE AND PLACE OF THE NEXT MEETING

The next meeting will be held October 6, 2008, in Porto, Portugal during the IEEE Transformer committee meetings.

  1. ADJOURN

Meeting adjourned at 10:55 am.

Reported By: / S. Choinski / March 19, 2008

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USNC TAG for IEC TC 14

Monday, March 17, 2008