EN IEC 60071-2-2018 en Insulation co-ordination - Part 2 Application guidelines.pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Insulation co-ordinationPart 2: Application guidelinesBS EN IEC 600712:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IEC 60071-2 May 2018 ICS 29.080 Supersedes EN 60071-2:1997 English Version Insulation co-or

2、dination - Part 2: Application guidelines (IEC 60071-2:2018) Coordination de lisolement - Partie 2: Lignes directrices en matire dapplication (IEC 60071-2:2018) Isolationskoordination - Teil 2: Anwendungsrichtlinie (IEC 60071-2:2018) This European Standard was approved by CENELEC on 2018-04-20. CENE

3、LEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on a

4、pplication to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN

5、-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary

6、, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrote

7、chnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN IEC 60071-2:2018 E National forewordThis British Stan

8、dard is the UK implementation of EN IEC 600712:2018. It is identical to IEC 600712:2018. It supersedes BS EN 600712:1997, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GEL/28, Electrical Insulation Coordination.A list of organizations represented on

9、this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 93673 9I

10、CS 29.080.30; 29.080.01Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STAND

11、ARDBS EN IEC 600712:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IEC 60071-2 May 2018 ICS 29.080 Supersedes EN 60071-2:1997 English Version Insulation co-ordination - Part 2: Application guidelines (IEC 60071-2:2018) Coordination de lisolement - Partie 2: Lignes directrices en matire dap

12、plication (IEC 60071-2:2018) Isolationskoordination - Teil 2: Anwendungsrichtlinie (IEC 60071-2:2018) This European Standard was approved by CENELEC on 2018-04-20. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European St

13、andard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (

14、English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committee

15、s of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovaki

16、a, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 C

17、ENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN IEC 60071-2:2018 E BS EN IEC 600712:2018EN IEC 60071-2:2018 (E) 2 European foreword The text of document 28/255/FDIS, future edition 4 of IEC 60071-2, prepared by IEC/TC 28 “Insulation

18、co-ordination“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 60071-2:2018. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2019-01-20 l

19、atest date by which the national standards conflicting with the document have to be withdrawn (dow) 2021-04-20 This document supersedes EN 60071-2:1997. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held res

20、ponsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60071-2:2018 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standard

21、s indicated: IEC 60099-4:2014 NOTE Harmonized as EN 60099-2014 (not modified). IEC 60099-5 NOTE Harmonized as EN IEC 60099-5. IEC 60099-8 NOTE Harmonized as EN IEC 60099-8. IEC 60507 NOTE Harmonized as EN 60507. IEC 62271-1:2017 NOTE Harmonized as EN 62271-1:2017 (not modified). IEC 62271-100:2008 N

22、OTE Harmonized as EN 62271-100:2009 (not modified). BS EN IEC 600712:2018EN IEC 60071-2:2018 (E) 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents are referred to in the text in such a way that some or all

23、 of their content constitutes requirements 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. NOTE 1 Where an International Publication has been modified by common modificat

24、ions, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60060-1 2010 High-voltage test techniques - Part 1: General definitions a

25、nd test requirements EN 60060-1 2010 IEC 60071-1 2006 Insulation co-ordination - Part 1: Definitions, principles and rules EN 60071-1 2006 + A1 2010 + A1 2010 IEC 60505 2011 Evaluation and qualification of electrical insulation systems EN 60505 2011 IEC/TS 60815-1 - Selection and dimensioning of hig

26、h-voltage insulators intended for use in polluted conditions - Part 1: Definitions, information and general principles - - ISO 2533 1975 Standard Atmosphere - - BS EN IEC 600712:2018 2 IEC 60071-2:2018 IEC 2018 CONTENTS FOREWORD . 8 1 Scope 10 2 Normative references 10 3 Terms, definitions, abbrevia

27、ted terms and symbols 11 3.1 Terms and definitions 11 3.2 Abbreviated terms . 11 3.3 Symbols 11 4 Representative voltage stresses in service 16 4.1 Origin and classification of voltage stresses 16 4.2 Characteristics of overvoltage protection devices 17 4.2.1 General remarks 17 4.2.2 Metal-oxide sur

28、ge arresters without gaps (MOSA) . 17 4.2.3 Line surge arresters (LSA) for overhead transmission and distribution lines 19 4.3 Representative voltages and overvoltages 19 4.3.1 Continuous (power-frequency) voltage . 19 4.3.2 Temporary overvoltages 20 4.3.3 Slow-front overvoltages . 23 4.3.4 Fast-fro

29、nt overvoltages 29 4.3.5 Very-fast-front overvoltages 13 33 5 Co-ordination withstand voltage . 34 5.1 Insulation strength characteristics . 34 5.1.1 General . 34 5.1.2 Influence of polarity and overvoltage shapes . 35 5.1.3 Phase-to-phase and longitudinal insulation 36 5.1.4 Influence of weather co

30、nditions on external insulation . 36 5.1.5 Probability of disruptive discharge of insulation . 37 5.2 Performance criterion 38 5.3 Insulation co-ordination procedures 39 5.3.1 General . 39 5.3.2 Insulation co-ordination procedures for continuous (power-frequency) voltage and temporary overvoltage 40

31、 5.3.3 Insulation co-ordination procedures for slow-front overvoltages . 40 5.3.4 Insulation co-ordination procedures for fast-front overvoltages 45 6 Required withstand voltage 46 6.1 General remarks . 46 6.2 Atmospheric correction . 46 6.2.1 General remarks 46 6.2.2 Altitude correction 46 6.3 Safe

32、ty factors 48 6.3.1 General . 48 6.3.2 Ageing . 48 6.3.3 Production and assembly dispersion 48 6.3.4 Inaccuracy of the withstand voltage . 48 6.3.5 Recommended safety factors (Ks) . 49 7 Standard withstand voltage and testing procedures . 49 BS EN IEC 600712:2018IEC 60071-2:2018 IEC 2018 3 7.1 Gener

33、al remarks . 49 7.1.1 Overview . 49 7.1.2 Standard switching impulse withstand voltage . 49 7.1.3 Standard lightning impulse withstand voltage . 50 7.2 Test conversion factors . 50 7.2.1 Range I 50 7.2.2 Range II 51 7.3 Determination of insulation withstand by type tests . 51 7.3.1 Test procedure de

34、pendency upon insulation type 51 7.3.2 Non-self-restoring insulation 52 7.3.3 Self-restoring insulation . 52 7.3.4 Mixed insulation . 52 7.3.5 Limitations of the test procedures 53 7.3.6 Selection of the type test procedures . 54 7.3.7 Selection of the type test voltages . 54 8 Special consideration

35、s for overhead lines 55 8.1 General remarks . 55 8.2 Insulation co-ordination for operating voltages and temporary overvoltages 55 8.3 Insulation co-ordination for slow-front overvoltages . 55 8.3.1 General . 55 8.3.2 Earth-fault overvoltages . 56 8.3.3 Energization and re-energization overvoltages

36、56 8.4 Insulation co-ordination for lightning overvoltages . 56 8.4.1 General . 56 8.4.2 Distribution lines 56 8.4.3 Transmission lines . 57 9 Special considerations for substations . 57 9.1 General remarks . 57 9.1.1 Overview . 57 9.1.2 Operating voltage 57 9.1.3 Temporary overvoltage 57 9.1.4 Slow

37、-front overvoltages . 58 9.1.5 Fast-front overvoltages 58 9.2 Insulation co-ordination for overvoltages . 58 9.2.1 Substations in distribution systems with Umup to 36 kV in range I 58 9.2.2 Substations in transmission systems with Umbetween 52,5 kV and 245 kV in range I . 59 9.2.3 Substations in tra

38、nsmission systems in range II . 60 Annex A (informative) Determination of temporary overvoltages due to earth faults . 61 Annex B (informative) Weibull probability distributions . 65 B.1 General remarks . 65 B.2 Disruptive discharge probability of external insulation . 66 B.3 Cumulative frequency di

39、stribution of overvoltages . 68 Annex C (informative) Determination of the representative slow-front overvoltage due to line energization and re-energization 71 C.1 General remarks . 71 C.2 Probability distribution of the representative amplitude of the prospective overvoltage phase-to-earth . 71 BS

40、 EN IEC 600712:2018 4 IEC 60071-2:2018 IEC 2018 C.3 Probability distribution of the representative amplitude of the prospective overvoltage phase-to-phase 71 C.4 Insulation characteristic 73 C.5 Numerical example . 75 Annex D (informative) Transferred overvoltages in transformers 81 D.1 General rema

41、rks . 81 D.2 Transferred temporary overvoltages 82 D.3 Capacitively transferred surges . 82 D.4 Inductively transferred surges . 84 Annex E (informative) Lightning overvoltages 88 E.1 General remarks . 88 E.2 Determination of the limit distance (Xp) . 88 E.2.1 Protection with arresters in the substa

42、tion . 88 E.2.2 Self-protection of substation 89 E.3 Estimation of the representative lightning overvoltage amplitude. 90 E.3.1 General . 90 E.3.2 Shielding penetration . 90 E.3.3 Back flashovers . 91 E.4 Simplified method . 93 E.5 Assumed maximum value of the representative lightning overvoltage .

43、95 Annex F (informative) Calculation of air gap breakdown strength from experimental data 96 F.1 General . 96 F.2 Insulation response to power-frequency voltages 96 F.3 Insulation response to slow-front overvoltages 97 F.4 Insulation response to fast-front overvoltages . 98 Annex G (informative) Exa

44、mples of insulation co-ordination procedure 102 G.1 Overview. 102 G.2 Numerical example for a system in range I (with nominal voltage of 230 kV) . 102 G.2.1 General . 102 G.2.2 Part 1: no special operating conditions 103 G.2.3 Part 2: influence of capacitor switching at station 2 110 G.2.4 Part 3: f

45、low charts related to the example of Clause G.2 112 G.3 Numerical example for a system in range II (with nominal voltage of 735 kV) 117 G.3.1 General . 117 G.3.2 Step 1: determination of the representative overvoltages values of Urp. 117 G.3.3 Step 2: determination of the co-ordination withstand vol

46、tages values of Ucw118 G.3.4 Step 3: determination of the required withstand voltages values of Urw119 G.3.5 Step 4: conversion to switching impulse withstand voltages (SIWV) . 120 G.3.6 Step 5: selection of standard insulation levels . 120 G.3.7 Considerations relative to phase-to-phase insulation

47、co-ordination 121 G.3.8 Phase-to-earth clearances . 122 G.3.9 Phase-to-phase clearances . 122 G.4 Numerical example for substations in distribution systems with Umup to 36 kV in range I 123 G.4.1 General . 123 BS EN IEC 600712:2018IEC 60071-2:2018 IEC 2018 5 G.4.2 Step 1: determination of the repres

48、entative overvoltages values of Urp. 123 G.4.3 Step 2: determination of the co-ordination withstand voltages values of Ucw124 G.4.4 Step 3: determination of required withstand voltages values of Urw125 G.4.5 Step 4: conversion to standard short-duration power-frequency and lightning impulse withstan

49、d voltages 126 G.4.6 Step 5: selection of standard withstand voltages 126 G.4.7 Summary of insulation co-ordination procedure for the example of Clause G.4 127 Annex H (informative) Atmospheric correction Altitude correction . 129 H.1 General principles . 129 H.1.1 Atmospheric correction in standard tests . 129 H.1.2 Task of atmospheric correction in insulation co-ordination . 130 H.2 Atmospheric correction in insulation co-ordination 132 H.2.1 Factors for atmospheric correction . 132 H.2.2 General ch