1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22432-5 SANS 60815-3:2009 Edition 1 IEC/TS 60815-3:2008 Edition 1SOUTH AFRICAN NATIONAL STANDARD Selection and dimensioning of high-voltag
4、e insulators intended for use in polluted conditions Part 3: Polymer insulators for a.c. systems This national standard is the identical implementation of IEC/TS 60815-3:2008 and is adopted with the permission of the International Electrotechnical Commission. Published by SABS Standards Division 1 D
5、r Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS. SANS 60815-3:2009 Edition 1 IEC/TS 60815-3:2008 Edition 1 Table of changes C
6、hange No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 67D, Electricity distribution systems and components Insulators, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS
7、document was published in March 2009. This standard may only be used and printed by approved subscription and freemailing clients of the SABS. IEC/TS 60815-3 Edition 1.0 2008-10 TECHNICAL SPECIFICATIONSelection and dimensioning of high-voltage insulators intended for use in polluted conditions Part
8、3: Polymer insulators for a.c. systems INTERNATIONAL ELECTROTECHNICAL COMMISSION R ICS 29.080.10 PRICE CODE ISBN 2-8318-1015-6 Registered trademark of the International Electrotechnical Commission SANS 60815-3:2009This standard may only be used and printed by approved subscription and freemailing cl
9、ients of the SABS. 2 TS 60815-3 IEC:2008(E) CONTENTS FOREWORD.3 1 Scope and object5 2 Normative references .5 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions 6 3.2 Abbreviations 6 4 Principles .6 5 Materials 7 5.1 General information on common polymer housing materials 7 5.2 Issue
10、s specific to polymer housing materials under pollution.7 5.2.1 Reduction of creepage distance.7 5.2.2 Extreme pollution.8 6 Site severity determination .9 7 Determination of the reference USCD.9 8 General recommendations for polymer profiles.10 9 Checking of profile parameters.11 9.1 General remark
11、 .11 9.2 Alternating sheds and shed overhang12 9.3 Spacing versus shed overhang12 9.4 Minimum distance between sheds .13 9.5 Creepage distance versus clearance.13 9.6 Shed angle14 9.7 Creepage factor 14 10 Correction of RUSCD .14 10.1 Correction for altitude K a .14 10.2 Correction for insulator dia
12、meter K ad .15 11 Determination of the final minimum creepage distance .15 12 Confirmation by testing.15 Annex A (informative) Background information on pollution induced degradation of polymers.17 Bibliography20 Figure 1 RUSCD as a function of SPS class 9 Figure 2 Typical “open” profiles10 Figure 3
13、 Typical steep polymeric profile.10 Figure 4 Typical shallow under-ribs on open profile .10 Figure 5 Typical deep under-rib profile.11 Figure 6 Typical “alternating” profiles.11 Figure 7 K adversus average diameter and illustration of parameters.15 Figure A.1 Operating areas as a function of polluti
14、on severity and USCD (for a fixed insulating length) 19 SANS 60815-3:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.TS 60815-3 IEC:2008(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS
15、INTENDED FOR USE IN POLLUTED CONDITIONS Part 3: Polymer insulators for a.c. systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to p
16、romote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guid
17、es (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC
18、also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as po
19、ssible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense.
20、While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees underta
21、ke to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to i
22、ndicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents includ
23、ing individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or relian
24、ce upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the ele
25、ments of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the pub
26、lication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or The subject is still under technical development or where, for any other reason, there is the future but no immediate possibility of an ag
27、reement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC/TS 60815-3, which is a technical specification, has been prepared by technical committee 36: Insulators.
28、SANS 60815-3:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 4 TS 60815-3 IEC:2008(E) The text of this technical specification is based on the following documents: Enquiry draft Report on voting 36/266/DTS 36/272A/RVC Full information on t
29、he voting for the approval of this technical specification can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the future IEC 60815 series, under the general title Selection
30、 and dimensioning of high-voltage insulators intended for use in polluted conditions, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ i
31、n the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. SANS 60815-3:2009This standard m
32、ay only be used and printed by approved subscription and freemailing clients of the SABS.TS 60815-3 IEC:2008(E) 5 SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED FOR USE IN POLLUTED CONDITIONS Part 3: Polymer insulators for a.c. systems 1 Scope and object IEC/TS 60815-3, which is a te
33、chnical specification, is applicable to the selection of polymer insulators for a.c. systems, and the determination of their relevant dimensions, to be used in high voltage systems with respect to pollution. This part of IEC/TS 60815 gives specific guidelines and principles to arrive at an informed
34、judgement on the probable behaviour of a given insulator in certain pollution environments. The contents of this technical specification are based on CIGRE 33.13 TF 01 documents 1,2 1 , which form a useful complement to this technical specification for those wishing to study in greater depth the per
35、formance of insulators under pollution. This technical specification does not deal with the effects of snow or ice on polluted insulators. Although this subject is dealt with by CIGRE 3, current knowledge is very limited and practice is too diverse. The object of this technical specification is to g
36、ive the user means to _ determine the reference unified specific creepage distance (USCD) from site pollution severity (SPS) class, choose appropriate profiles, apply correction factors for altitude, insulator shape, size and position, etc. to the reference USCD. 2 Normative references The following
37、 referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-471, International Electrotechnical Vocabulary Part
38、471: Insulators IEC/TS 60815-1, Selection and dimensioning of high-voltage insulators for polluted conditions Part 1: Definitions, information and general principles IEC/TR 62039, Selection guide for polymeric materials for outdoor use under HV stress IEC/TS 62073, Guidance on the measurement of wet
39、tability of insulator surfaces 1Figures in square brackets refer to the bibliography. SANS 60815-3:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 6 TS 60815-3 IEC:2008(E) 3 Terms, definitions and abbreviations 3.1 Terms and definitions Fo
40、r the purposes of this document, the following terms, definitions and abbreviations apply. The definitions given below are those which either do not appear in IEC 60050-471 or differ from those given in IEC 60050-471. 3.1.1 unified specific creepage distance USCD creepage distance of an insulator di
41、vided by the r.m.s. value of the highest operating voltage across the insulator NOTE 1 This definition differs from that of specific creepage distance where the line-to-line value of the highest voltage for the equipment is used (for a.c. systems usually U m / 3). For line-to-earth insulation, this
42、definition will result in a value that is 3 times that given by the definition of specific creepage distance in IEC/TR 60815 (1986). NOTE 2 For U m see IEV 604-03-01 3. NOTE 3 It is generally expressed in mm/kV and usually expressed as a minimum. 3.1.2 reference unified specific creepage distance RU
43、SCD initial value of unified specific creepage distance for a pollution site before correction for size, profile, mounting position, etc. according to this technical specification and generally expressed in mm/kV 3.2 Abbreviations CF creepage factor ESDD equivalent salt deposit density HTM hydrophob
44、icity transfer material NSDD non-soluble deposit density SDD salt deposit density SES site equivalent salinity SOR safe operating regions SPS site pollution severity USCD unified specific creepage distance RUSCD reference unified specific creepage distance 4 Principles The overall process of insulat
45、ion selection and dimensioning can be summarized as follows: Firstly, using IEC/TS 60815-1: determine the appropriate approach 1, 2 or 3 as a function of available knowledge, time and resources; collect the necessary input data, notably system voltage, insulation application type (line, post, bushin
46、g, etc.); collect the necessary environmental data, notably site pollution severity and class. At this stage a preliminary choice of possible candidate insulators suitable for the applications and environment may be made. SANS 60815-3:2009This standard may only be used and printed by approved subscr
47、iption and freemailing clients of the SABS.TS 60815-3 IEC:2008(E) 7 Then, using this technical specification: refine choice of possible candidate polymer insulators suitable for the environment; determine the reference USCD for the insulator types and materials, either using the indications in the t
48、his technical specification, or from service or test station experience in the case of approach 1 (Clause 7); choose suitable profiles for the type of environment (Clause 8); verify that the profile satisfies certain parameters, with correction or action according to the degree of deviation (Clause
49、9); modify, where necessary (approaches 2 and 3), of the reference USCD by factors depending on the size, profile, orientation, etc. of the candidate insulator (Clauses 10 and 11); verify that the resulting candidate insulators satisfy the other system and line requirements such as those given in Table 2 of IEC/TS 60815-1 (e.g. imposed geometry, dimensions, economics); verify the dimensioning, if required in the case of approach 2, by laboratory test
