1、 IEC/TS 60815-3 Edition 1.0 2008-10 TECHNICAL SPECIFICATIONSelection and dimensioning of high-voltage insulators intended for use in polluted conditions Part 3: Polymer insulators for a.c. systems IEC/TS 60815-3:2008(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland
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10、2 919 03 00 IEC/TS 60815-3 Edition 1.0 2008-10 TECHNICAL SPECIFICATIONSelection and dimensioning of high-voltage insulators intended for use in polluted conditions Part 3: Polymer insulators for a.c. systems INTERNATIONAL ELECTROTECHNICAL COMMISSION R ICS 29.080.10 PRICE CODE ISBN 2-8318-1015-6 Regi
11、stered trademark of the International Electrotechnical Commission 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
12、on common polymer housing materials 7 5.2 Issues 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 Check
13、ing of profile parameters.11 9.1 General remark .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 alt
14、itude K a .14 10.2 Correction for insulator diameter 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 clas
15、s 9 Figure 2 Typical “open” profiles10 Figure 3 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 Figu
16、re A.1 Operating areas as a function of pollution severity and USCD (for a fixed insulating length) 19 TS 60815-3 IEC:2008(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED FOR USE IN POLLUTED CONDITIONS Part 3: Polymer insulators for a.c
17、 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 promote international co-operation on all questions concerning standardizat
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26、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 elements of this IEC Publication may be the subject of patent rights. IEC sha
27、ll 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 publication of a technical specification when the required support cannot be
28、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 agreement on an International Standard. Technical specifications are subject
29、 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. 4 TS 60815-3 IEC:2008(E) The text of this technical specification is based
30、 on the following documents: Enquiry draft Report on voting 36/266/DTS 36/272A/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 with the ISO/IEC Direc
31、tives, 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 publication will remain u
32、nchanged 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 edition, or amended.
33、 A bilingual version of this publication may be issued at a later date. 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 technical specifica
34、tion, 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 judgement on the
35、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 performance of insul
36、ators 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 give the user mean
37、s 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 referenced docum
38、ents 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 471: Insulators I
39、EC/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 wettability of insul
40、ator surfaces 1Figures in square brackets refer to the bibliography. 6 TS 60815-3 IEC:2008(E) 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms, definitions and abbreviations apply. The definitions given below are those which eith
41、er 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 divided by the r.m.s. value of the highest operating voltage across the insulator NOTE 1 This definition differs from that of specific creepa
42、ge 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 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
43、 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 RUSCD initial value of unified specific creepage distance for a pollution site before correction for size, profile, mounting position, etc. a
44、ccording to this technical specification and generally expressed in mm/kV 3.2 Abbreviations CF creepage factor ESDD equivalent salt deposit density HTM hydrophobicity transfer material NSDD non-soluble deposit density SDD salt deposit density SES site equivalent salinity SOR safe operating regions S
45、PS site pollution severity USCD unified specific creepage distance RUSCD reference unified specific creepage distance 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
46、 a function of available knowledge, time and resources; collect the necessary input data, notably system voltage, 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 possib
47、le candidate insulators suitable for the applications and environment may be made. 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 material
48、s, either using the indications in the 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 accor
49、ding to the degree of deviation (Clause 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
