IEC TR 60269-5-2014 Low-voltage fuses - Part 5 Guidance for the application of low-voltage fuses《低压熔断器 第5部分 低压熔断器应用指南》.pdf

1、 IEC TR 60269-5 Edition 2.0 2014-03 TECHNICAL REPORT RAPPORT TECHNIQUE Low-voltage fuses Part 5: Guidance for the application of low-voltage fuses Fusibles basse tension Partie 5: Lignes directrices pour lapplication des fusibles basse tension IEC TR 60269-5:2014-03(en-fr) colour inside THIS PUBLICA

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19、z nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC TR 60269-5 Edition 2.0 2014-03 TECHNICAL REPORT RAPPORT TECHNIQUE Low-voltage fuses Part 5: Guidance for the application of low-voltage fuses Fusibles basse tension Partie 5: Lignes dire

20、ctrices pour lapplication des fusibles basse tension INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 29.120.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1448-0 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission E

21、lectrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC TR 60269-5:2014 IEC 2014 CONTENTS FOREWORD . 6 INTRODUCTION . 8 1

22、Scope 9 2 Normative references 9 3 Terms and definitions 10 4 Fuse benefits . 12 5 Fuse construction and operation 13 5.1 Components . 13 5.2 Fuse-construction . 13 5.2.1 Fuse link 13 5.2.2 Fuse-link contacts . 14 5.2.3 Indicating device and striker 14 5.2.4 Fuse-base . 14 5.2.5 Replacement handles

23、and fuse-holders . 14 5.3 Fuse operation 15 5.3.1 General . 15 5.3.2 Fuse operation in case of short-circuit . 15 5.3.3 Fuse operation in case of overload 15 5.3.4 Fuse link pre-arcing time current characteristic: . 16 5.3.5 Fuse operation in altitudes exceeding 2 000 m 17 6 Fuse-combination units 1

24、8 7 Fuse selection and markings . 19 8 Conductor protection . 21 8.1 General . 21 8.2 Utilization category gG . 22 8.3 Utilization category gN and gD 23 8.4 Utilization category gR and gS 23 8.5 Utilization category gU 24 8.6 Utilization category gK 24 8.7 Utilization category gPV 24 8.8 Protection

25、against short-circuit current only 24 9 Selectivity of protective devices . 24 9.1 General . 24 9.2 Selectivity between fuses 25 9.2.1 General . 25 9.2.2 Verification of selectivity for operating time 0,1 s 25 9.2.3 Verification of selectivity for operating time 0,1 s 26 9.2.4 Verification of total

26、selectivity 26 9.3 Selectivity of circuit-breakers upstream of fuses . 26 9.3.1 General . 26 9.3.2 Verification of selectivity for operating time 0,1 s 27 9.3.3 Verification of selectivity for operating time 0,1 s 27 9.3.4 Verification of total selectivity 27 9.4 Selectivity of fuses upstream of cir

27、cuit-breakers . 28 9.4.1 General . 28 9.4.2 Verification of selectivity for operating time 0,1 s 28 IEC TR 60269-5:2014 IEC 2014 3 9.4.3 Verification of selectivity for operating time 0,1 s 28 9.4.4 Verification of total selectivity 28 10 Short-circuit damage protection . 30 10.1 General . 30 10.2 S

28、hort-circuit current paths . 30 10.3 Current limitation 31 10.4 Rated conditional short-circuit current, rated breaking capacity . 31 11 Protection of power factor correction capacitors 31 12 Transformer protection 32 12.1 Distribution transformers with a high-voltage primary 32 12.2 Distribution tr

29、ansformers with a low-voltage primary . 33 12.3 Control circuit transformers . 33 13 Motor circuit protection 33 13.1 General . 33 13.2 Fuse and motor-starter coordination . 34 13.3 Criteria for coordination at the rated conditional short-circuit current I q. 34 13.4 Criteria for coordination at the

30、 crossover current I co. 35 13.5 Criteria for coordination at test current “r” . 35 14 Circuit-breaker protection in a.c. and d.c rated voltage circuits . 36 15 Protection of semiconductor devices in a.c. and d.c. rated voltage circuits 36 16 Fuses in enclosures . 38 16.1 General . 38 16.2 Limiting

31、temperature of utilization category gG fuse-links according to IEC 60269-2 System A . 38 16.3 Other fuse-links 38 17 DC applications . 38 17.1 General . 38 17.2 Short-circuit protection 38 17.3 Overload protection 39 17.4 Time-current characteristics 40 18 Automatic disconnection for protection agai

32、nst electric shock for installations in buildings 40 18.1 General . 40 18.2 Principle of the protection . 41 18.3 Examples 42 19 Photovoltaic (PV) system protection 43 19.1 General . 43 19.2 Selection of PV fuse-links . 44 19.2.1 Fuse utilization category 44 19.2.2 PV string fuses 44 19.2.3 Fuse rep

33、lacement 44 19.2.4 Unearthed or Ungrounded PV Systems 44 19.2.5 Functional earthing fuses . 44 19.2.6 PV array and PV sub-array fuses . 45 19.2.7 Fuse monitoring . 45 19.2.8 Breaking capacity 45 19.2.9 Voltage of gPV fuses . 45 19.2.10 Rated current of gPV fuses 45 4 IEC TR 60269-5:2014 IEC 2014 20

34、Protection of wind mills 45 Annex A (informative) Coordination between fuses and contactors/motor-starters 47 A.1 General . 47 A.2 Examples of suitable fuse-links used for motor protection . 47 A.3 Values of I 2 t and cut-off current observed in successful tests of fuse- link/motor-starter combinati

35、ons worldwide . 48 A.4 Criteria for coordination at the rated conditional short-circuit current I q. 51 A.4.1 General . 51 A.4.2 Maximum operating I 2 t and cut-off current . 51 A.4.3 Guidance for choosing the maximum rated current of an alternative fuse type . 52 A.4.4 Further guidance . 52 A.5 Cri

36、teria for coordination at test current “r“ . 53 A.6 Types of coordination 54 Bibliography 57 Figure 1 Typical fuse-link according to IEC 60269-2. 13 Figure 2 Typical fuse-link according to IEC 60269-2. 14 Figure 3 Current-limiting fuse operation . 15 Figure 4 Fuse operation on overload 16 Figure 5 T

37、ime current characteristic for fuse-links 17 Figure 6 Currents for fuse-link selection . 23 Figure 7 Selectivity General network diagram . 25 Figure 8 Verification of selectivity between fuses F 2and F 4for operating time t 0,1 s . 26 Figure 9 Verification of selectivity between circuit-breaker C 2a

38、nd fuses F 5and F 6. 27 Figure 10 Verification of selectivity between fuse F 2and circuit-breaker C 3for operating time t 0,1 s . 29 Figure 11 Verification of selectivity between fuse F 2and circuit-breaker C 3for operating time t 0,1 s . 30 Figure 12 Fuse and motor-starter coordination . 35 Figure

39、13 DC circuit . 39 Figure 14 DC breaking operation . 39 Figure 15 Fuse operating time at various d.c. circuit time constants . 40 Figure 16 Time-current characteristic . 42 Figure A.1 Collation of cut-off currents observed in successful coordination at I q. 49 Figure A.2 Pre-arcing and operating I 2

40、 t values of fuses used in successful coordination tests as a function of contactor rated current AC3 . 50 Figure A.3 Pre-arcing and operating I 2 t values of fuses used in successful coordination tests as a function of fuse rated current I n51 Figure A.4 Illustration of the method of selection of t

41、he maximum rated current of a fuse for back-up protection of a contactor of rating I e= X amperes . 54 Figure A.5 Withstand capabilities of a range of contactors and associated overload relays at test current “r“ 55 Figure A.6 Illustration of a method of deriving curves of maximum peak current at te

42、st current “r“ as a function of fuse rated current . 56 IEC TR 60269-5:2014 IEC 2014 5 Table 1 Derating factors for different altitudes 18 Table 2 Definitions and symbols of switches and fuse-combination units 19 Table 3 Fuse application 20 Table 4 Maximum operational voltage of a.c. fuse-links . 21

43、 Table 5 Typical operational voltage ratings of d.c. fuse-links 21 Table 6 Fuse selection for power factor correction capacitors (fuses according to IEC 60269-2, system A) 32 Table 7 Conventional non fusing current 37 Table 8 Time constants of typical d.c. circuits 40 Table A.1 Examples of typical f

44、use-link ratings used for motor-starter protection illustrating how the category of fuse-link can influence the optimum current rating 48 Table A.2 (Table 12 of IEC 60947-4-1:2009) Value of the prospective test current according to the rated operational current . 53 Table A.3 Types of coordination .

45、 54 6 IEC TR 60269-5:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE FUSES Part 5: Guidance for the application of low-voltage fuses FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrote

46、chnical committees (IEC National Committees). The object of IEC is to promote 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 Specificatio

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48、governmental and non- governmental organizations liaising with the IEC 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 decis

49、ions 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 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. While