J. Densley F. Koch W. Larzelere

W. McDermid H. Oetjen L. Salberg

R. Schlesinger N. Srinivas M. Walton.

The main item of the meeting was to review the latest draft dated May 2004, which reflected the changes and comments added, to resolve issues from the March 4, 2004 ballot.

That ballot resulted in 53 affirmative votes, with 20 having some comments, and one negative vote with remedying comments provided.  Those remedying comments were included in the May 2004 revised draft and accepted by the negative voter.  This draft was posted on the IEEE/ICC website for all working group members to review.  The purpose of this meeting was for working group members to discuss and resolve any issues that may remain with those comments (and only those comments, now shown in red) so as to finalize the corrected draft.  It was made clear that all other text of this document has previously been accepted by action of the vote and was not open to further discussion or subject to comment in the forthcoming recirculation ballot.

The following salient points were recorded as the document was reviewed.  [Items are not included where no further action was required, no further correction to the document was necessary, or where comments were made only for informational purposes.]

1.     Page 2.  The negative vote was made because of concern of a safety issue.  This lead to the reference to IEC 612230 Standard.  Accepted

2.     Page 3.  The negative vote led to the inclusion of the red text in section 5.1.  This was accepted.

3.     Page 4.  The negative vote led to additional red text to be added -Portable ground clamps and grounding assemblies built and tested per IEC 61230 are recommended.-  Accepted.

4.     Page 4.  The 7th line from the bottom has a repeated "the" which is to be removed.

5.     Page 5, 2nd line from the bottom.  Delete the red text "that are 30% longer than the insulation thickness".  Accepted.

6.     Page 8.  The nomenclature (only) was changed from Vrms and Vpeak to rms Voltage and peak Voltage, respectively, because of IEEE terminology requirements.  This nomenclature change had no bearing on the substantive meaning of these phrases and was cause not open up this subject for further discussion.  Agreed.

7.     Page 9.  The first line in red text will have added after the word "dissipate" the phrase "or recover".  Agreed.

8.     Page 9.  Delete from this section the first red bulleted item under section 6.2.4 "Combined VLF withstand test with dissipation factor and/or partial discharge measurements cannot be used due to switching transients during the polarity change".

9.     Page 10.  Reference to the fifth bulleted item under section 6.3.3 opened a discussion by Henning Oetjen where he said that the HDW system was able to directly measure leakage current and that this information was sent to the working group for inclusion in the document but was never included.  An item was added to section 6.2.3 stating that the leakage current could be measured with the cosine/rectangular waveform.

10.   Page 12.  The red text added to the second sentence of paragraph 6.5.2 was agreed to as acceptable.

11.   Page 17.  An attempt to find some better wave shapes showing better symmetry around the vertical and horizontal axis will be located and replace the ones currently shown.

12.   Page iv.  Nagu Srinivas informed us that Hans Gnerlich will not be returning to the Chairman position of this working group and John Densley accepted that position and the Vice Chair position was offered to Robert Schlesinger, who accepted that position.  This change will be shown on page iv when this document is reissued, and the required documents will be submitted to formalize this change.

The minor changes agreed to at the meeting were incorporated into the revised document, and the document, along with a recirculation ballot letter, was submitted to the IEEE.  As of the end of May, the document was sent on recirculation to resolve the negative ballot, and this has now been successfully resolved.  The ballot should close during the last week of May, 2004.

 

The Group met on Monday, November 1 2004 at 9:15 a.m. with 13 members and 36 guests.

Participants	Affiliation	WG Member
Densley, J.	ArborLec Solutions	Y
Petzold, F.	SEBA KMT	Y
Thue, W.	Consultant	Y
Schlesinger, R.	R. Schlesinger Consulting	Y
Smalley, M.	We Energies	Y
Lemke, E.	Lemke Diagnostics	Y
Koch, F.	PSE	Y
Cherukupali S.	BC Hydro	N
Yau. D.	Emnax	N
Buchholtz, V.	Powertech Labs	N
Landers, G.	Von Corpn.	N
Sikora, D.	DuQuesne Light	N
Bernstein, B.	B. Bernstein Consulting	N
Kanour, H.	MEAG Power	N
Crotty, D.	Hubbell PS	N
Wilki, T.	Forte PS	N
Harp, R.	TXU Electric Delivery	N
Russwurm, D.	Specialty Instrument Service	N
Goodwin, C.	HV Diagnostics	N
Wright, S.	Power Engineers	N
Lanz, B.	IMCORP	N
Cox, P.	MLGW	N
Sheerin, G.	EHV Power	N
Bryant, M.	PSE&G	N
Bigenho, F.	Seattle City Light	N
Fryszczyn, B.	CTL	N
Bromley, J.	Manitoba Hydro	N
Hunt, J.	Salt River Project	N
Goyette, T.	National Grid	N
Jue. J.	BCTC	N
Bayer, M.	Dow Chemical	N
Kennedy, G.	Nebraska PPD	N
Zemyan, N.	PPL Electric	N
Herron, John	HV Technologies	N
Trinh, D.	Joslyn	N
Robeson, E.	Progress Energy	N
Nakamura, C.	Hawaiian Electric	N
Banting, J.	Cooper PS	N
Mendelsohn, A.	Dow Chemical	N
Ainscough, J.	Xcel Energy	N
Arnold, D.	Epcor	N
Levine, J.	Kinectrics	N

The chairman reviewed:

• Inappropriate topics at IEEE WG meetings
• IEEE-SA Board Bylaws on Patents and Standards

As the WG is beginning a revision of the Guide, anyone wishing to become a WG member should contact the Chairman or Vice-chairman.

Draft 4 of the Guide, which had been balloted successfully, was approved by the IEEE Standards Board on 9/23/2004. It is not known when it will be available from IEEE.

The purpose of the Working Group is now to start work immediately on gathering data on test voltages and durations, practices and results to determine if a revision will be needed. In particular the values of the test voltages for the two waveshapes need to be clarified, for example, should the rms or peak values of the voltage for the two waveshapes be equivalent as in Tables 4 and 5 of the present version of the guide.

In the discussion the following points were raised:

• The voltages listed in Tables 4 and 5 of the guide (1.5 to ~2Vo) are too low because some are using 3Vo
• The test stresses for the different voltage classes in the Tables were similar
• In the notes following the Tables "distortion" should be "harmonic distortion"
• Comment that Malaysian paper, which described extensive VLF tests, said the vast majority of failures were in joints
• Tan delta values are temperature dependant so that lab and field test data may show differences
• In addition to failures during the testing the future performance of the circuit should be examined

Bill Thue requested that the WG inform him what details on VLF can be dropped out of IEEE 400, now that 400.2 has been accepted.

B. Bernstein mentioned that we should set up a template to collect the data so that it would be easier to make comparisons. Included should be details on the cable construction, insulation, vintage, operating conditions, single or mixed cable types in test, VLF waveshape, voltage magnitude and duration at each test voltage, time of failure (if applicable), and, if possible, a follow-up on future performance.

The following persons who have carried out extensive VLF testing or have access to VLF test data agreed to present data at the next meeting - Craig Goodwin, Henning Oetjen, and Fred Koch. Data from utilities would also be welcome. Anyone presenting data should contact J. Densley, F. Koch, or R. Schlesinger

A template has been prepared by R. Schlesinger and will be circulated to WG members for comments.

Some preliminary data on tan delta measurements at 0.1 Hz obtained by Kent Brown was shown. Care must be taken in the interpretation of results if non-linear stress grading materials are used in the accessories. In addition tan delta can vary with time. K. Brown has agreed to make a presentation at the next Meeting.

Thanks to Fred Koch who took notes from which these minutes were prepared. The meeting ended at 10:15 a.m.