8.10Underground Transformers and Network Protectors – Carl G.Niemann

Meeting Minutes – DallasTexas

8.10.1Introduction/Attendance

The Underground Transformers and Network Protectors Subcommittee met on Wednesday, March14, 2007, in the Lincoln East room of the Hilton Lincoln Centre Hotel at 9:30 AM with 9 members and 9 guests present.

8.10.2Approval of Minutes

The minutes of the October 24, 2006 meeting in Montreal, Quebec were amended to correct the spelling of a name and approved as amended.

8.10.3Membership

Membership stands at 16 members. No new memberships were requested.

8.10.4Chairman’s Remarks

The following Administrative Subcommittee notes were reported to the subcommittee:

  • The attendance statistics and future meeting locations
  • The Committee is looking at the standards update process for working groups. The Committee is aware that WGs are looking for editorial staff support from IEEE.
  • The Committee is looking at citing sources for statistics that have been published.
  • The Committee is considering creating a Treasurer officer position to comply with IEEE requirements.
  • The Committee is evaluating a reduced registration fee for guest speakers and guest attendees.

8.10.5Working Group Reports

8.10.5.1Underground Single Phase Transformers (C57.12.23) – A. Traut, Chairman

  1. There were 11 members and 8 guests for a total of 19 in attendance. The total membership of the WG stands at 27.
  2. The chair requested disclosure of any patents that might impact this standard. There were no patents disclosed at this meeting.
  3. The minutes of the March 2006 meeting in Costa Mesa were approved as submitted.
  4. The chair reported that the PAR has an expiration date of 12/31/2009 and that the exiting document published in 2002 is valid to that date.
  5. The WG agreed to make the following changes to Draft 5 of the document.
  6. Clause 6 Tests. Remove the year designations from the references to IEEE C57.12.00-2000 and IEEE C57.12.90-1999.
  7. Discussed the reference to fault current tests in clause 7.5. Discussion on whether the fault current (arc under oil) test has the same importance in a welded cover round tank. All agreed that the test is valid and should be retained.
  8. Clause 7.3 – Remove the word ‘minimum’ from the last sentence on the pressure relief fitting. Also change the word ‘An’ to ‘A’ in the last sentence regarding liquid level indicator.
  9. Clause 7.1 add a sentence to specify that high-voltage connectors and low-voltage terminals are welded to the tank or cover.
  10. Fig 1 – Show the low-voltage terminals as bushings in the figure.
  11. Fig 2 – clean-up the drawing for better legibility.
  12. With these changes in place, the document will proceed to the sponsor ballot.

8.10.5.2Three-Phase Underground-Type Transformers (C57.12.24) – Giuseppe Termini, Chairman

  1. The meeting was called to order by the Chairman at 8:00 a.m. on Monday, March 12, 2007 in the Washington Room of the Hilton Hotel in Dallas, Texas.
  2. Introductions were made. The meeting was attended by 13 members and 8 guests.
  3. The Chairman opened the meeting by asking if anyone in the Working Group knew or had knowledge of any existing or pending patents that may affect the work on this standard. All responses were negative.
  4. The Meeting Minutes from the previous meeting in Montreal, Québec, CANADA, were reviewed and approved. The status of the PAR was discussed. The PAR was approved by the IEEE-SA Standards Board and it is valid until 31 December 2011.
  5. The rest of the meeting consisted of a review of the changes in Draft D of the standard.
  6. Two comments were received:
  7. Section 1.3 Word Usage - A suggestion was made to delete this section if the definition for the words “shall”, “should” and “may” already exist in the IEEE definition standard. The WG Chair will investigate and make a recommendation.
  8. Figure 1 - The tank dimensions for 3750 KVA rated transformers will be added to the 125 kV BIL Table. This change was not carried out when standard was changed from Draft B to Draft C.
  9. A motion to take Draft D of the standard, as amended by the comments received at this meeting, to balloting. The motion was voted on and was approved.
  10. The meeting was adjourned at 8:35 a.m.

8.10.5.3Liquid Filled Secondary Network Transformers (C57.12.40) – B. Klaponski, Chairman

  1. The WG met on Monday, March 12, 2007 at 09:30 am with 14 members and 4 guests.
  2. The chairman reviewed the patent legal issue and asked whether there were any patents or patents pending that would affect the WG or standard. None were identified.
  3. The minutes of the October 23, 2006 meeting in Montreal, Quebec were amended to include an additional attendee. The minutes were approved as amended.
  4. D. Blew gave an update on PAR status. New PAR was submitted in February 2007 and approval is pending. Should be approved in March 2007. He will send confirmation number to all members so they can review on the IEEE website.
  5. B. Klaponski reiterated the comments made at the October meeting that the procedures for a Working Group to update a standard are overly complicated and too much administrative work is required from the WG. This places a huge burden on the WG chairs. There is a lot of opportunity for improvement in the process. This issue is being reviewed by the Transformer Committee officers and was discussed at the Administrative SC meeting.
  6. L. Dix made a presentation on Switch Testing DC vs. AC. L. Dix had received info from a few utilities regarding typical network circuit relay protection settings to assist the WG in establishing the proper short circuit ratings of the high voltage switch. After discussion it was agreed that the WG would add this information as an informative appendix to the standard. L. Dix also made a presentation on short circuit requirements for switch testing. In summary, the intent is for the standard to define switch requirements, which at present are not well defined. L. Dix agreed to prepare draft wording and send to WG by June 07. Copy of the presentation and working draft will be sent to all WG participants.
  7. B. Klaponski discussed changes to standard that he feels are needed. He will send proposed changes to WG soon for review.
  8. D. Blew agreed to prepare draft wording for informative annex on DC cable testing to include the history of in-service DC cable testing.
  9. The WG had a brief discussion regarding the impact of proposed DOE efficiency standards and the possibility of larger submersible transformers.
  10. The meeting was adjourned at 10:50am with the next meeting in Minneapolis, MN.

8.10.5.4Secondary Network Protectors (C57.12.44) – D.H. Mulkey, Chairman

  1. This working group did not meet.

8.10.6Old Business

  1. None

8.10.7New Business

  1. The proposed DOE efficiency standards were discussed briefly.
  2. A member requested clarification on requirements for becoming a Life Member of the Main Committee.
  3. The cost of the Standards Association membership was discussed. Present annual cost is $37. One member stated that he felt it was unfair to charge WG members who volunteer their time to update standards.

8.10.8Future Meetings

The location and dates for future meetings are as follows:

  • October14-18, 2007Minneapolis, Minnesota
  • March 16-20, 2008 Charlotte, NC
  • October 5-9, 2008 Porto, Portugal
  • April 19-23, 2009 (tentative) Southern USA location

8.10.9The Subcommittee adjourned at 10:06 AM.