36-WG11/Warsaw/34 23/01/00 Minutes of the third meeting of Working Group 11 of TC36 (Revision of IEC 60815) Held in Warsaw on 12th and 13th October 99.
Present: Lumb, Clive – Project Leader Wu, Dong Marinoni, Franco Martin, Richard Nord, Sven Petrusch, Wolfgang Schandl, Peter Spangenberg, Eric Suzuki, Rick Wancowicz, Jacek 1. Opening of the meeting Jacek Wancowicz welcomed the experts to Warsaw. The Project Leader thanked him on behalf of the WG. 2. Approval of the agenda The agenda (36-WG11/Warsaw/29) was approved 3. Introduction 3.1. Apologies for absence, Apologies for absence were received from • • •
Frank Schmuck, Konstantin Papailiou Allan Hurst 3.2. Membership list, Address check (36-WG11/DOC/B2)
• •
Changes to e-mails – Eric Spangenberg, Dong Wu, Don Swift now affiliated to the University of Wales, Cardiff.
New list 36-WG11/Doc/B3 posted on the web site 3.3. Timetable of the meeting, travel plans 3.4. Problems with electronic documents, software and mail 4. Submitted document numbering The web site has been updated with the documents submitted.
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5. Approval of the minutes of the 2nd meeting in Mannheim (36-WG11/Mannheim/20) 5.1. Content The minutes were approved. 5.2. Task reports (point 11 of the minutes) Key : a= Done,
r= Not done, 8= Continued, 6= Dropped, Task
Status
CL
Prepare skeleton outline
a
All
Note your personal opinion/belief/knowledge on the key points of insulator geometry. Send to CL for collation
8
All
Study table 1 of IEC 60815, suggest additional definitions or factors
All
Suggest SDD and NSDD values for table 1
DAS
Distil the review, try to put the source with references
All
Read 60815, mark up with OK, NO or Needs Modifying
a a a a
All
ESDD and NSDD measurements on post or long rod insulators with “simple” profiles
a
FM
Copy of shed profiles to CL
RS
Revise document 11, send to CL to add to draft
a a a a r r
CL/DW Modify block diagram WP
Input to TF01 on changes to flow chart/correction Fig 3-16
RM
Write text for altitude factor
RM
Text describing applicability to bushings/influence of internal parts
JW/RS Summary of ESDD measurements on LR insulators, include site description
a
FS
Summary of CIGRE document on influence of diameter
r
CL
Graph of different ESDD levels proposed in docs 14,18 existing 815
8
JW
Hotel details to members
CL
Text for outline 1
DW
Text for outline 2
ES
Text for outline 3
WP
Text for outline 4
SN
Text for outline 5
RM
Text for outline 6
DW
Information on CIS project
a r r a a a r a -2-
6. Report on the activity of CIGRE TF 33.13.01 (DAS) DAS presented the main points arising from the Cigré 33.04/07.01 meeting held in Lucerne. It was again noted that the TF was preparing Guidelines rather than a Guide. The review document had been submitted 1 September 99 for publication. DAS indicated that the IEC schedule for the 60815 project was too tight compared to the TF01 work plan. (1st TF01 draft of guidelines: autumn 2000, final: autumn 2001). CL indicated that it would be possible to justify some delay in 60815 since the work depended on TF01. DAS noted that the TF01 review was a bit “light” concerning pollution severity evaluation – TF03 (Pollution monitoring) was being revived to correct this. Member’s views are being requested on methods supplementary to ESDD/NSDD. 7. Study of submitted documents 7.1. Cigré review doc, main conclusions/comments related to insulator characteristics (36-WG11/Warsaw/32- (DAS) B.11 – d.c. critical severity 10 times lower than a.c. - Is the effect linear or does it “saturate»? B.12 – S-C Glaze – RS confirmed that s-c glaze is not suitable for d.c. and that the glaze on cap and pin insulators was different around the pin. C (polymer): −
Length can have an influence (propagation time)
−
Few statistics for d.c. polymer (Mozambique, New Zealand, Denmark, SOCAL, India) so must study mechanism also.
−
CL indicated that the same housing material was used, profiles were studied (cf. CIGRE review doc), need for sacrificial electrodes, have no guidelines for creepage. 7.2. ESDD/NSDD measurements, 36-WG11/Warsaw/22 and 30 (RS)
The documents were studied. The following points were noted. −
General: Need to define sectors (i.e. to cater for wind influence), where top/bottom start and finish, what to do about drops. (DW, DAS, CL).
−
Composites: Only need to remove soluble pollution, remaining encapsulated pollution has little influence (ES). Do not refer to boiling or ultrasound (JW).
−
Composites : warn that only porcelain/glass suitable for site assessment (RM)
−
Chemical analysis: What use is it? (DW) – To determine fast/slow dissolving content (WP)
−
Put warnings into main text.
−
Measuring area should be >= 500 cm², use 2 – 4 l/m², dissolve 30 to 45 minutes.
RS to complete corrections.
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7.3. Pollution evaluation, 36-WG11/Warsaw/28 (ES) JW: No short-term correlation between DDG and ESDD DW: Didn’t like using site descriptions as they reduce stress on need for measurement JW: Utilities don’t want to measure anything DW: Must define cost/confidence ratio DW: A table easier to use than a graph JW: Use an informative approach showing the influence of one single parameter? RM: Table showing Increasing severity/increasing ESDD & NSDD/where such conditions can be found. DW: Do we need a textual description on other (better) methods to analyse conditions, then put the table as a minor priority? RM: How can we transfer to dc or composite? DW: Don’t forget what 815 already states on extreme conditions. DW: Propose 5 tables; Parameters, Confidence (test station, lines, monitors..), Test station requirements, Data analysis from the line, Monitor requirements. ? ES: Include leakage currents? Quicker than ESDD? WP/JW: Only Ih applies, do not include.. more for TF01. RM proposed a table with visual aids showing ESDD and NSDD ranges with typical sites opposite. CL proposed a similar table. RM table adopted. Notes on the table: Don’t forget conductive deposit, Add note to play safe if people don’t find “their” site in the description. RM/DW to prepare the table. ES/DW to revise document 28. CL table to be submitted to TF01. 7.4. Industrial ESDD on long rods 36-WG11/Warsaw/23 (JW) The ESDD values were noted, the document to be kept on hand for discussion of profile/size. It was noted that SiR composites had been installed in 1981, good performance. Results published in 1889 by Gubanski. The influence of shape was non-existent at lower levels of pollution (small particles which get everywhere). 7.5. Marine ESDD on disc and long rods 36-WG11/Warsaw/24 (RS) The ESDD values were noted, the document to be kept on hand for discussion of profile/size and environmental factors. It was noted that on the mainland long rods behaved better for long-term pollution, worse for “quick” (winds, storms). DAS noted the opposite at BITS.
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7.6. System requirements 36-WG11/Warsaw/25 (WP) Mention phase to phase used for systems, phase to ground for evaluation. Add “see relevant parts” at end of Type of system. Refer to 60071-1 for Um. WP to make changes, Document adopted. 7.7. Proposals to modify 815 36-WG11/Warsaw/27 (FM) 1. Electra ref., ES to include in his document. 2. Position - salt fog tests: cap and pin strings improve by √2 when inclined above 15-20°. Reduce by √2 for multiple strings. Post and bushings reduce by √2 when not vertical. Conclusion: need rules for position + multiple strings. 3. CL to check pollution tables in IEC 60071-2 DAS to collate information from WP (long rods), RS (cap + pin) and EPRI handbook to determine limits for spacing of multiple strings below which there is an influence. 8. Documents not discussed Through lack of time, the agenda could not be completed. The following documents were outstanding: −
Influence of diameter 36-WG11/Warsaw/?? (SN)
SN to submit to CL for circulation. −
Proposal for chapter 5 - 36-WG11/Warsaw/26 (SN)
ALL study, comment, discuss in Vienna CL rewrite and submit to SN for approval −
Text for flowchart 25 - 36-WG11/Warsaw/31 (DW)
ALL study, comment, discuss in Vienna 9. Work programme and tasks Tasks remaining from Mannheim Task
Limit Date
All
Note your personal opinion/belief/knowledge on the key points of insulator geometry. Send to CL for collation
2000/01/25
RM
Write text for altitude factor
2000/01/25
RM
Text describing applicability to bushings/influence of internal parts
2000/01/25
FS
Summary of CIGRE document on influence of diameter
2000/01/25
CL
Graph of different ESDD levels proposed in docs 14,18 existing 815
2000/01/25
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CL
Text for outline 1
2000/01/25
DW
Text for outline 2
2000/01/25
RM
Text for outline 6
2000/01/25 New tasks Task
Limit Date
ALL
Form factor, where and when does it work
2000/01/25
CL/DAS
Look into form factor in more detail
2000/01/25
RS
Modify/combine Warsaw22 and 30 for annex A
2000/01/25
RM/DW
Prepare new pollution severity table
2000/01/25
ES/DW
Revise Warsaw28 to include table
2000/01/25
CL
Submit “precise” version of table to TF01
2000/03/01
WP
Changes to Warsaw25
2000/01/25
ES
Include Electra ref. in Warsaw28
2000/01/25
DAS
Collate information on influence of proximity of strings from RS and WP
2000/01/25
SN
Submit diameter influence to CL for circulation
1999/12/31
ALL
Study Warsaw26
2000/01/25
ALL
Study Warsaw31
2000/01/25
10. Date and place of the next meeting A kind invitation was made by Peter Schandl and to hold the next meeting in Vienna on the 25th and 26th January 2000, with a visit to the CERAM factory on the 27th. 11. Close of the meeting The project leader thanked the members for their hard work and Jacek Wankowicz for his excellent hospitality. He then declared the meeting closed
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