36-WG11/Stockholm/50
National Committee
Clause/ Subclause
Paragraph Figure/ Table
Type of COMMENTS comment (General/ Technical/Editor ial) Editorial The Portuguese National Committee agrees with document, with the following suggestion: use comma in numeric values instead of points. The Spanish National Committee has no comments on the text. UK may submit comments at the Stockholm meeting The French National Committee support the revision of the IEC 60815; 1986. The French National Committee approve the introduction of the NSDD value in addition of ESDD to characterize the pollution severity. The French National Committee consider the modification of the geometrical parameters as a priority
Portugal
General
Spain
General
United Kingdom France
General
Germany
Introductory note
Italy
1
1 line
Editorial
United States of America Germany
1
Paragraph 6
Editorial
1
Page nd 2 par
General
Editorial st
4 Editorial
The publication number must be changed “IEC 60815” instead of “IEC 60915” The meaning of the terms “dimensioning’’ and “design” would be clarified. Their use on the same sentence could be misleading and contradictory. “The aim this guide” should be corrected.
Date
Document
2000-08-12
36/173A/DC
Proposed change
OBSERVATIONS OF WG11 on each comment submitted
Change to “IEC 60815”
Proposal would be to delete the statement “but not the design” and clarify the term “dimensioning” (for example: determining the suitable creepage distance) “The aim of this guide”
“glass fibre core” is not a technical Change “glass fibre core” into “fibre term, the load bearing part of a reinforced core” composite insulators consists of a polymeric matrix system that is axially reinforced by glass or synthetic fibres
36-WG11/Stockholm/50 Page 1
National Committee
Clause/ Subclause
United States of America United States of America
4
Australia
5.1
Germany
5.1
United States of America Germany
5.2.3
Paragraph Figure/ Table
5
6
Page 5
Type of COMMENTS comment (General/ Technical/Editor ial) Editorial “TOV: 50 Hz temporary overvoltage” should be generalized to also cover 60 Hz. Technical Ribs are briefly mentioned as contributing to pollution performance, but not significantly and not in terms of the protected leakage distance they may provide. Surface condition is emphasized. The existing history with porcelain would indicate that leakage distance combined with protected leakage distance are significant factors in an insulator’s contamination performance. The voltage gradient also has an impact on the pollution flashover mechanism. Technical
Editorial
Page 8
Technical
This section provides useful information but can not be a normative text “The required minimum specific distance” should be corrected
Proposed change
OBSERVATIONS OF WG11 on each comment submitted
“TOV: Temporary overvoltage”
Add additional sections regarding the improved pollution performance of fog bowl or high-leak designs.
Text shall (informative)
become
an
appendix
“The required minimum specific leakage distance”.
It shall be made clear that pollution Please consider in Clause 3 “Definition” in the sense of this standard shall mean natural pollution only. Also, a clear distinction shall be made between pollution conditions at specific sites (pollution level) and pollution on an insulator surface. Further, it shall be made clear that testing is not within the scope of this standard.
36-WG11/Stockholm/50 Page 2
National Committee
Clause/ Subclause
Czech Republic
6.1.3
Paragraph Figure/ Table
Type of COMMENTS comment (General/ Technical/Editor ial) The list of in Technical At the beginning of the list to add the situ method of one more method, that is used in measurement some countries for evaluation of s pollution severity
The fifth paragraph from the bottom of the page 9
Germany
6.1.3
6.1.3
Page 9
After adding the new method it is necessary to change the beginning “The first three methods ..... of the first sentence “The first two methods......
Technical
The result of evaluation of pollution severity based on the measurement on sample insulators is influenced by insulator shape. For example in desert conditions the amount of sediments on aerodynamic insulator is smaller than on anti-fog or standard insulators. To add the following paragraph: It shall be added that the accumulation of pollution and self cleaning properties strongly depend on insulator type, material and shed profile.
Page 9 nd 2 par
Technical
Technical
OBSERVATIONS OF WG11 on each comment submitted
• analysis of sediments collected in gauges (evaluation of amount of sediments, conductivity of soluble components etc.)
Technical
Before the fourth paragraph from the bottom of the page 9 Germany
Proposed change
The results of evaluation of pollution severity obtained by in situ measurement methods based on measurements on sample insulators are valid for given insulator type only. The different insulator types (anti-fog, long rod, aerodynamic, etc.) have the different behaviour under pollution. Add new paragraph after “Information on wetting shall be obtained”:
“The accumulation and self cleaning properties depend strongly on the insulators type, material and on the shed profile” In some areas, for example arid Add note: areas, it will be necessary to “In some areas, for example arid areas, it measure for a period of at least 3 will be necessary to measure for a period years of at least 3 years”
36-WG11/Stockholm/50 Page 3
National Committee
Italy
Clause/ Subclause
6.2
Paragraph Figure/ Table
Figure 2
Type of COMMENTS comment (General/ Technical/Editor ial) Technical The influence of the NSDD on the quantitative evaluation of the pollution site severity value would seem to be too high and conservative in respect to insulator pollution performance. ENEL/CESI experience is that, in general, site pollution layers with higher NSDD values contain salts with low solubility (industrial, desert and agricultural pollution types) and, in laboratory tests, the criticity or flashover probability value of an insulator polluted with a suspension containing low solubility salts is lower than the one polluted with high solubility salts, under the same other conditions. This would be considered in the quantitative definition of the site pollution severity levels. Suggestion would be to provide laboratory and service insulator pollution performance data which have been considered for the quantitative definition of the site pollution severity levels shown in Figure 2.
Proposed change
OBSERVATIONS OF WG11 on each comment submitted
36-WG11/Stockholm/50 Page 4
National Committee
Italy
Clause/ Subclause
Paragraph Figure/ Table
6.2
Italy
6.2
Table 3
Germany
6.2
Page 10
Type of COMMENTS comment (General/ Technical/Editor ial) Technical Our opinion is that it would be suitable to have a quantitative definition of the pollution site severity levels using the three severity parameters normally adopted for the artificial pollution tests: i.e. Salinity 3 (kg/m ), Layer conductivity (µS) 2 and Salt deposit density (mg/cm ). These parameters are currently used for the selection and dimensioning of insulators for polluted conditions in different countries. Proposal would be to complete the figure of the quantitative site severity values by adding a Table with values (or range of values), expressed in terms of Salinity and Layer conductivity Technical The meaning of the statement “At normal wind speed” needs to be clarified. Our opinion is that both wind speed and duration would influence the accumulation process of pollution on the insulator surfaces. Technical Headline “Pollution severity level”. Insulators of different type and different material may behave different in the same environment. It is obvious that the same level of pollution may be more or less severe. Consequently the term “pollution level” shall not be mixed up with the term “severity”.
Proposed change
OBSERVATIONS OF WG11 on each comment submitted
Proposal would be to add in Table 3 two columns with site pollution levels, as follows: 3 Salinity -Sa - in kg/m • Very light: 56 Layer conductivity – K – in µS: To be defined by the WG
Suggestion would be to delete the statement “at normal wind speed” under the title of the second column Table.
Change headline to “Pollution level”.
36-WG11/Stockholm/50 Page 5
National Committee
Germany
Germany
Clause/ Subclause
6.2
6.2
Paragraph Figure/ Table
Page st 1 par
Page Figure 2
nd
Type of COMMENTS comment (General/ Technical/Editor ial) It shall be made clear that there is 10 Technical not “very light pollution” and not “very heavy pollution” in an absolute meaning. We understand that these terms refer to site severities.
10 Technical
Germany
7
2 par type of system”
Editorial
Germany
7
Editorial
Germany
7
Par. “Overvoltages” Par “Overvoltages”
Technical
Proposed change
OBSERVATIONS OF WG11 on each comment submitted
The first paragraph shall be changed as follows:
“For the purpose of standardisation five levels of pollution characterising the site severity are qualitatively defined from very light pollution to very heavy pollution.” Figure 2 refers only to standard Add new figures that provide information cap&pin insulators. Similar figures and data for ceramic and composite like figure 2 should be given for all longrod insulators. insulator types and materials for ac and dc. The diagrams shall be amended by data for long rod insulators. The title of figure 2 shall read as follow: “relation between ESDD/NSDD and site severity for standard glass and ceramic cap&pin insulators.” Replace text by: “for the comparison of specific creepage distances of ac and dc systems it shall be noted that the creepage distance values are related to either the line to line voltage or the line to earth voltage.”
It is not necessary to provide information about the dc and ac behaviour at this place in the document. The particulars of the system types “DC” and “AC” will be further described in individual parts (part 2-5) of IEC60815. For the definition of TOVs refer to Add reference to IEC60072-2 IEC60072-2
It is not clear what types of TOV Please specify under what conditions have to be considered with respect TOV shall be considered to the flashover of polluted insulators. Please specify the term “natural grounded system” The term “natural grounded system” is not clear
36-WG11/Stockholm/50 Page 6
National Committee
Clause/ Subclause
Germany
7
Australia
9
Italy
A.3.1
Paragraph Figure/ Table
Par. “reliability availability, maintainability (RAM)”
Items b) and c) of page 16
Type of COMMENTS Proposed change comment (General/ Technical/Editor ial) Technical Such special features should not be Delete paragraph. part of a standard
Technical
OBSERVATIONS OF WG11 on each comment submitted
The ratio of sheath diameter to shed diameter causes the surface current density to vary along an insulator and does influence the pollution performance. It is presumed that either form factor or profile factor will address this issue. ESDD measurements in sites would Suggestion would be to put the text of the be carried out with the same Sub-clause in line with the one given in accuracy adopted for the IEC 60507 measurements of SDD in laboratory
36-WG11/Stockholm/50 Page 7
