IEC TS 60815-2-2008 Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 2 Ceramic and glass insulators for a.c .pdf

1、 IEC/TS 60815-2 Edition 1.0 2008-10 TECHNICAL SPECIFICATIONSelection and dimensioning of high-voltage insulators intended for use in polluted conditions Part 2: Ceramic and glass insulators for a.c. systems IEC/TS 60815-2:2008(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Sw

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10、Fax: +41 22 919 03 00 IEC/TS 60815-2 Edition 1.0 2008-10 TECHNICAL SPECIFICATIONSelection and dimensioning of high-voltage insulators intended for use in polluted conditions Part 2: Ceramic and glass insulators for a.c. systems INTERNATIONAL ELECTROTECHNICAL COMMISSION S ICS 29.080.10 PRICE CODE ISB

11、N 2-8318-1015-5 Registered trademark of the International Electrotechnical Commission 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 Si

12、te severity determination .8 7 Determination of 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

13、.2 Spacing versus shed overhang15 9.3 Minimum distance 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 require

14、d minimum nominal creepage distance19 12 Confirmation 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

15、as a function of SPS class 9 Figure 2 Typical “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 TS 60815-2 IEC:

16、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 unit or string.13 Table 3 Profile suitability, relative to a standard prof

17、ile, for porcelain and glass insulators assuming the same insulating length 14 Table 4 Artificial pollution test parameters for confirmation by testing 20 4 TS 60815-2 IEC:2008(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED FOR USE IN PO

18、LLUTED CONDITIONS Part 2: Ceramic and glass 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 promote inter

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29、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 agreement on a

30、n 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 60815-2, which is a technical specification, has been prepared by technical committee 36: Insulators. This first e

31、dition of IEC/TS 60815-2, together with IEC/TS 60815-1, cancels and replaces IEC/TR 60815, which was issued as a technical report in 1986. It constitutes a technical TS 60815-2 IEC:2008(E) 5 revision and now has the status of a technical specification. The text of this technical specification is bas

32、ed 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 with the ISO/IEC Dir

33、ectives, 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

34、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 edition, or amended

35、. A bilingual version of this publication may be issued at a later date. 6 TS 60815-2 IEC:2008(E) SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED 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 technica

36、l 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 in high-voltage systems with respect to pollution. This part of IEC 60815 gives specific guidelines and principles to arrive at an informed

37、 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 is fully explained in IEC/TS 60815-1. The object of this technical specification is to give the user means to: determine the reference unifi

38、ed specific creepage distance (RUSCD) from site pollution severity (SPS) class; evaluate the suitability of different insulator profiles; determine the necessary USCD by applying corrections for insulator shape, size, position, etc. to the RUSCD; if required, determine the appropriate test methods a

39、nd parameters to verify the performance of the selected insulators. 2 Normative references The following 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 doc

40、ument (including any amendments) applies. IEC 60050-471, International Electrotechnical Vocabulary Part 471: Insulators IEC 60507, Artificial pollution tests on high-voltage insulators to be used on a.c. systems IEC/TS 60815-1, Selection and dimensioning of high-voltage insulators for polluted condi

41、tions Part 1: Definitions information and general principles 3 Terms, definitions and abbreviations For 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 give

42、n in IEC 60050-471. TS 60815-2 IEC:2008(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 distanc

43、e 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 For U m s

44、ee IEV 604-03-01 1 1 . NOTE 3 It is generally 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

45、to this technical specification and generally 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

46、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 a function of available knowledge, time and resources; collect the ne

47、cessary 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 possible candidate insulators suitable for the applications and environment

48、 may be made. Then, using this technical specification: refine the choice of possible candidate ceramic or glass insulators suitable for the environment; 1References in square brackets refer to the bibliography. 8 TS 60815-2 IEC:2008(E) determine the reference USCD for the insulator types and materi

49、als, 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 necessary (approaches 2 and 3), of the RUSCD by fact