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 978-0-626-22431-8 SANS 60815-2:2009 Edition 1 IEC/TS 60815-2:2008 Edition 1SOUTH AFRICAN NATIONAL STANDARD Selection and dimensioning of high-voltag
4、e insulators intended for use in polluted conditions Part 2: Ceramic and glass insulators for a.c. systems This national standard is the identical implementation of IEC/TS 60815-2:2008 and is adopted with the permission of the International Electrotechnical Commission. Published by SABS Standards Di
5、vision 1 Dr 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 60815-2:2009 Edition 1 IEC/TS 60815-2:2008 Edition 1 Table of
6、 changes Change 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.
7、This SANS 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 60815-2 Edition 1.0 2008-10 TECHNICAL SPECIFICATIONSelection and dimensioning of high-voltage insulators intended for use in polluted condit
8、ions Part 2: Ceramic and glass insulators for a.c. systems INTERNATIONAL ELECTROTECHNICAL COMMISSION S ICS 29.080.10 PRICE CODE ISBN 2-8318-1015-5 Registered trademark of the International Electrotechnical Commission SANS 60815-2:2009This standard may only be used and printed by approved subscriptio
9、n and freemailing clients of the SABS. 2 TS 60815-2 IEC:2008(E) CONTENTS FOREWORD.4 1 Scope and object6 2 Normative references .6 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions 7 3.2 Abbreviations 7 4 Principles .7 5 Materials 8 6 Site severity determination .8 7 Determination of
10、 the reference unified specific creepage distance (RUSCD) 8 8 Choice of profile .9 8.1 General recommendations for porcelain and glass profiles 9 8.2 Profile suitability12 9 Checking the profile parameters .12 9.1 Alternating sheds and shed overhang15 9.2 Spacing versus shed overhang15 9.3 Minimum d
11、istance between sheds .16 9.4 Creepage distance versus clearance.16 9.5 Shed angle17 9.6 Creepage factor 17 10 Correction of the RUSCD17 10.1 Correction for altitude K a .18 10.2 Correction for insulator diameter K ad .18 11 Determination of the required minimum nominal creepage distance19 12 Confir
12、mation by testing.19 12.1 Determination of the long-duration withstand voltage.19 12.2 Selection of the standard pollution withstand test type.19 12.3 Artificial pollution test parameters20 12.4 Criteria of confirmation 21 Bibliography22 Figure 1 RUSCD as a function of SPS class 9 Figure 2 Typical “
13、standard” profiles10 Figure 3 Typical “open” profiles11 Figure 4 Typical “anti-fog” profiles11 Figure 5 Typical “alternating” profiles.11 Figure 6 Typical pin insulator shed profiles 12 Figure 7 K adas a function of insulator diameter 18 SANS 60815-2:2009This standard may only be used and printed by
14、 approved subscription and freemailing clients of the SABS.TS 60815-2 IEC:2008(E) 3 Table 1 Principal advantages (+) and disadvantages (-) of main profile types 10 Table 2 Profile suitability, relative to a standard profile, for porcelain and glass insulators assuming the same creepage distance per
15、unit or string.13 Table 3 Profile suitability, relative to a standard profile, for porcelain and glass insulators assuming the same insulating length 14 Table 4 Artificial pollution test parameters for confirmation by testing 20 SANS 60815-2:2009This standard may only be used and printed by approved
16、 subscription and freemailing clients of the SABS. 4 TS 60815-2 IEC:2008(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED FOR USE IN POLLUTED CONDITIONS Part 2: Ceramic and glass insulators for a.c. systems FOREWORD 1) The International El
17、ectrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic field
18、s. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC
19、National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardizati
20、on (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 possible, an international consensus of opinion on the relevant subjects since each technical committee has representa
21、tion 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. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cann
22、ot 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 undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publication
23、s. 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 indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC P
24、ublication. 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 including individual experts and members of its technical committees and IEC National Committees for any personal injury,
25、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 reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited
26、 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 elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying
27、 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 publication of a technical specification when the required support cannot be obtained for the publication of an Interna
28、tional 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 agreement on an International Standard. Technical specifications are subject to review within three years of publicati
29、on to decide whether they can be transformed into International Standards. IEC/TS 60815-2, which is a technical specification, has been prepared by technical committee 36: Insulators. This first edition of IEC/TS 60815-2, together with IEC/TS 60815-1, cancels and replaces IEC/TR 60815, which was iss
30、ued as a technical report in 1986. It constitutes a technical SANS 60815-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.TS 60815-2 IEC:2008(E) 5 revision and now has the status of a technical specification. The text of this technical spe
31、cification is based on the following documents: Enquiry draft Report on voting 36/265/DTS 36/271A/RVC Full information on the 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 wit
32、h the ISO/IEC Directives, Part 2 A list of all the parts in the future IEC 60815 series, under the general title Selection 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 publica
33、tion will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in 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 ed
34、ition, or amended. A bilingual version of this publication may be issued at a later date. SANS 60815-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 6 TS 60815-2 IEC:2008(E) SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED
35、FOR USE IN POLLUTED CONDITIONS Part 2: Ceramic and glass insulators for a.c. systems 1 Scope and object IEC/TS 60815-1, which is a technical specification, is applicable to the selection of ceramic and glass insulators for a.c. systems, and the determination of their relevant dimensions, to be used
36、in high-voltage systems with respect to pollution. This part of IEC 60815 gives specific guidelines and principles to arrive at an informed judgement on the probable behaviour of a given insulator in certain pollution environments. The basis for the structure and approach of this part of IEC 60815 i
37、s fully explained in IEC/TS 60815-1. The object of this technical specification is to give the user means to: determine the reference unified specific creepage distance (RUSCD) from site pollution severity (SPS) class; evaluate the suitability of different insulator profiles; determine the necessary
38、 USCD by applying corrections for insulator shape, size, position, etc. to the RUSCD; if required, determine the appropriate test methods and parameters to verify the performance of the selected insulators. 2 Normative references The following referenced documents are indispensable for the applicati
39、on 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 471: Insulators IEC 60507, Artificial pollution tests on
40、high-voltage insulators to be used on a.c. systems IEC/TS 60815-1, Selection and dimensioning of high-voltage insulators for polluted conditions Part 1: Definitions information and general principles 3 Terms, definitions and abbreviations For the purposes of this document, the following terms, defin
41、itions 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. SANS 60815-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.TS 60815-2 IEC:2008(
42、E) 7 3.1 Terms and definitions 3.2 unified specific creepage distance USCD creepage distance of an insulator divided 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 hi
43、ghest voltage for the equipment is used (for a.c. systems usually U m / 3). For line-to-earth insulation, this 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 1 1 . NOTE 3 It is gene
44、rally expressed in mm/kV and usually expressed as a minimum. 3.3 reference unified specific creepage distance RUSCD 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 gene
45、rally expressed in mm/kV 3.4 Abbreviations CF creepage factor ESDD equivalent salt deposit density NSDD non soluble deposit density SDD salt deposit density SES site equivalent salinity SPS site pollution severity USCD unified specific creepage distance RUSCD reference unified specific creepage dist
46、ance 4 Principles The overall process of insulation 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 volta
47、ge, insulation application type (line, post, bushing, 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. Then, using this technical
48、 specification: refine the choice of possible candidate ceramic or glass insulators suitable for the environment; 1References in square brackets refer to the bibliography. SANS 60815-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 8 TS 6
49、0815-2 IEC:2008(E) determine the reference USCD for the insulator types and materials, either using the indications given in this 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 9); modify, where ne
