1、 IEC TR 60890 Edition 2.0 2014-05 TECHNICAL REPORT RAPPORT TECHNIQUE A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation Mthode de vrification par calcul des chauffements pour les ensembles dappareillage basse tension IEC TR 60890:2014-05(en-
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19、sc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC TR 60890 Edition 2.0 2014-05 TECHNICAL REPORT RAPPORT TECHNIQUE A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculat
20、ion Mthode de vrification par calcul des chauffements pour les ensembles dappareillage basse tension INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 29.130.20 PRICE CODE CODE PRIX ISBN 978-2-8322-1566-1 Registered trademark of the International Electrotechn
21、ical Commission Marque dpose de la Commission Electrotechnique 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. 2 IEC TR 60890:2014 IEC 2014 CONTENTS F
22、OREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 7 4 Conditions for application 7 5 Calculation 8 5.1 Necessary information 8 5.2 Calculation procedure . 8 General . 8 5.2.1Determination of the effective cooling surface A eof the enclosure . 8 5.2.2Determinatio
23、n of the internal temperature rise t 0,5of the air at mid- 5.2.3 height of the enclosure 8 Determination of the internal temperature rise t 1,0of air at the top of 5.2.4 the enclosure . 9 Characteristic curve for temperature rise of air inside enclosure 9 5.2.5 6 Evaluation of the design 11 Annex A
24、(informative) Examples for the calculation of the temperature-rise of air inside the enclosures . 20 A.1 Example 1 . 20 A.2 Example 2 . 23 Annex B (informative) Operating current and power losses of conductors 27 Bibliography 32 Figure 1 Temperature-rise characteristic curve for enclosures with A ee
25、xceeding 1,25 m 2. 10 Figure 2 Temperature-rise characteristic curve for enclosures with A enot exceeding 1,25 m 210 Figure 3 Enclosure constant k for enclosures without ventilation openings, with an effective cooling surface A e 1,25 m 2. 13 Figure 4 Temperature distribution factor c for enclosures
26、 without ventilation openings and with an effective cooling surface A e 1,25 m 2. 14 Figure 5 Enclosure constant k for enclosures with ventilation openings and an effective cooling surface A e 1,25 m 215 Figure 6 Temperature distribution factor c for enclosures with ventilation openings and an effec
27、tive cooling surface A e 1,25 m 216 Figure 7 Enclosure constant k for enclosures without ventilation openings and with an effective cooling surface A e 1,25 m 2. 17 Figure 8 Temperature distribution factor c for enclosures without ventilation openings and with an effective cooling surface A e 1,25 m
28、 2. 18 Figure 9 Calculation of temperature rise of air inside enclosures 19 Figure A.1 Example 1, calculation for an enclosure with exposed side faces without ventilation openings and without internal horizontal partitions . 20 Figure A.2 Example 1, calculation for a single enclosure 22 Figure A.3 E
29、xample 2, calculation for an enclosure for wall-mounting with ventilation openings . 23 IEC TR 60890:2014 IEC 2014 3 Figure A.4 Example 2, calculation for one enclosure half . 24 Figure A.5 Example 2, calculation for an enclosure for wall-mounting with ventilation openings . 26 Table 1 Method of cal
30、culation, application, formulae and characteristics 11 Table 2 Symbols, units and designations . 12 Table 3 Surface factor b according to the type of installation 12 Table 4 Factor d for enclosures without ventilation openings and with an effective cooling surface A e 1,25 m 212 Table 5 Factor d for
31、 enclosures with ventilation openings and an effective cooling surface A e 1,25 m 212 Table B.1 Operating current and power loss of single-core copper cables with a permissible conductor temperature of 70 C (ambient temperature inside the enclosure: 55 C) 28 Table B.2 Reduction factor k 1for cables
32、with a permissible conductor temperature of 70 C (extract from IEC 60364-5-52:2009, Table B.52-14) 29 Table B.3 Operating current and power loss of bare copper bars with rectangular cross-section, run horizontally and arranged with their largest face vertical (ambient temperature inside the enclosur
33、e: 55 C, temperature of the conductor 70 C) 30 Table B.4 Factor k 4for different temperatures of the air inside the enclosure and/or for the conductors . 31 4 IEC TR 60890:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ A METHOD OF TEMPERATURE-RISE VERIFICATION OF LOW-VOLTAGE SWITCHGEAR AN
34、D CONTROLGEAR ASSEMBLIES BY CALCULATION 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 que
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45、r, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC/TR 60890, which is a technical report, has been prepared by subcommittee 1
46、7D: Low- voltage switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and controlgear. This second edition cancels and replaces the first edition published in 1987 and its Amendment 1:1995. It constitutes a technical revision. This edition includes the following significa
47、nt technical changes with respect to the last edition: alignment with IEC 61439-1:2011; revision of Annex B; general editorial review. IEC TR 60890:2014 IEC 2014 5 The text of this technical report is based on the following documents: Enquiry draft Report on voting 17D/490/DTR 17D/499/RVC Full infor
48、mation on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged
49、 until the stability 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 reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC TR 60890:2014 IEC 2014 INTRODUCTION In IEC 61439-1, in the series of design verifications, a temperature-rise verification of low- voltage po
