36-WG11/Stockholm/61 27/01/00 Minutes of the fifth meeting of Working Group 11 of TC36 (Revision of IEC 60815) Held in Stockholm on 20th and 22nd September 2000.

Present: Lumb, Clive – Project Leader Goedel, Gustav Kuhl, Martin (Convenor TC 36 WG12) Martin, Richard Nord, Sven Perin, Danilo (replacing Marinoni, Franco) Schmuck, Frank Seifert, Jens (replacing Petrusch, Wolfgang) Spangenberg, Eric Suzuki, Rick Swift, Don Vosloo, Wallace Wu, Dong 1. Opening of the meeting Sven Nord welcomed the experts to Stockholm and the IEC General Meeting. The Project Leader thanked him on behalf of the WG. 2. Apologies for absence, Apologies for absence were received from • • • •

Franco Marinoni – replaced by Danilo Perin for the meeting Jacek Wankowicz Wolfgang Petrusch - replaced by Jens Seifert for the meeting, No news from Allan Hurst – Allan is much better and back at work

3. Approval of the agenda The agenda (36-WG11/ Stockholm /53) was approved. 4. Approval of the minutes of the 4th meeting held in Vienna (36-WG11/Vienna/47) 4.1. Content Title : …. fourth meeting… 4.2. Task reports It was decided to deal with task as they arose during the meeting

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36-WG11/Stockholm/61 27/01/00 5. Submitted document numbering The web site will be updated with the documents submitted at the meeting as follows. Stockholm/57

R. Suzuki

Effect of SDD/NSDD on pollution withstand voltage

Stockholm/58

F. Schmuck Some comments about different matters

Stockholm/59

DAS

Multiple strings: Effect of spacing on flashover of the assembly

6. Report on the activity of CIGRE TF 33.13.01 (DAS) DAS indicated that the CIGRE review document had been published (N° 158) and that the application guide was on its way. A meeting had been held in Djerba in February 2000 followed by one in Paris in September. Task has been distributed for the preparation of the application guide and editing and writing sere under way. The next meeting will be held in Mannheim in March 2001. The question on whether the WG should meet before or after the next TF33.13.01 meeting. It was suggested by DAS that the WG meet after TF 33.13.01; a tentative date of 24/25 April 2001 at EdF Renardières was agreed - with backup dates of 10/11 May. 7. Examination of the comments on 36/173A/DC - 36-WG11/Stockholm/50 The comments of the WG are shown in the document prepared for the IEC TC 36 meeting and circulated as 36(WG11/Stockholm)9 and is available on the web site as 09-WG11-36.pdf. The following point arose during the discussions: WV

Rapid events are not dealt with – to be included. Note also to mention in maintenace/palliatives risk of single unit flashovers when replacing cap & pin discs.

DP

Cannot always scale due to non-linearity in voltage gradient

WV

Dust deposit gauge (DDG) useful in parallel with ESDD. Remember to rinse the tube !

CIGRE TF01 Invert figure 2 DS

Need correlation of DDG to flashover performance

WV

Have found better correlation than with ESDD/NSDD.

RM

Need more detail for homework, create a forum ?

CL

Propose to produce as complete a draft as possible for the next meeting

CL

Will write officially to the WG members stressing urgency (message from TC 36)

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36-WG11/Stockholm/61 27/01/00 These points and other discussions led to the following task list: Person

Task

Status

WV

Definition of rapid events

Done

WV

Integrate rapid events into the description of the pollution flashover mechanism

Done

WV

Integrate rapid events into the pollution severity description & evaluation Done

DW

Write linking text between mechanism and severity for §5

DP

Supply references of reports on non linearity communicate to DAS

JS/JW

Try to produce a "figure 2" for long rods

WV

Review practical application of ESDD/NSDD measurement given in Annex A

CL

Move ESDD/NSDD to top of list in 6.1.3

DAS

Continue work on Form Factor

ES

Confirm possibility of next meeting at EdF

Done

WV

Find a simpler layout for Figure 1

Done

Done

WV/RM/ General responsibility for revising §6 (– to include DW climate/environment/wetting) RM

Change layout of Figure 2 (abscissa on the bottom)

DW/WV

Co-operate on and produce site severity evaluation criteria/method for conductive fogs,

WV/FS

Supply formula/interpretation on climate/environment/wetting in §6, FS to knock into shape

RZ/CL

Modify Table 2 (I don't remember what we had to do with this - anybody else ???)

WV

Supply Eskom description of insulator types etc. for §8.2 to Sven Nord for inclusion

DAS

Study/produce different approach for arid areas

Partly done

RM

Annex on usefulness of DD gauge

Partly done

Done

CL/CDT Write text for §9 on parameters of creepage/profile etc. CL

Draft outline for Part II

CL

Official letter to WG members stressing urgency

CL

Create mailing list

Done

WV/CL

Assemble and complete the work so far, add missing pieces.

Partly done

8. Examination of other documents Due to lack of time these documents were not discussed.

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36-WG11/Stockholm/61 27/01/00 9. Work programme and tasks A projected meeting plan was drawn up along with prospective readiness dates for various drafts. The main target dates being : Part 1 – CD April 2002, Part 2 – DC/CD April 2002 Part 3 – DC October 2002 (Next TC 36 meeting in Beijing)

Part I

Part II

Part III

Now

% Time of meeting spent on each Part

April 2001 EdF

60 %

30 %

10 %

Oct 2001 Milan

40 %

60 %

20 %

April 2002 ???

30 %

50 %

20 %

Oct 2002 Beijing ?

Study comments 30%

40 %

30 %

10. Date and place of the next meeting Eric Spangenberg invited the WG to meet at EdF Renardières in April 2001. Franco Marinoni invited the WG for a later meeting in Milan in October 2001. 11. Close of the meeting The project leader thanked the members for their hard work and Sven Nord and the Swedish National Committee for their hospitality. He then declared the meeting closed

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