1、 IEC 60255-149 Edition 1.0 2013-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Measuring relays and protection equipment Part 149: Functional requirements for thermal electrical relays Relais de mesure et dispositifs de protection Partie 149: Exigences fonctionnelles pour relais lectriques thermique
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16、0 2013-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Measuring relays and protection equipment Part 149: Functional requirements for thermal electrical relays Relais de mesure et dispositifs de protection Partie 149: Exigences fonctionnelles pour relais lectriques thermiques INTERNATIONAL ELECTROTE
17、CHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 29.120.70 PRICE CODE CODE PRIX ISBN 978-2-8322-1005-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publ
18、ication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colourinside 2 60255-149 IEC:2013 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 7 4 Specification of the function 8 Genera
19、l . 8 4.1Input energizing quantities/energizing quantities . 9 4.2Binary input signals . 9 4.3Functional logic . 10 4.4Equivalent heating current . 10 4.4.1Basic (setting) and operating current values for thermal protection 10 4.4.2Thermal level calculation . 11 4.4.3Time-current limit characteristi
20、c equations and curves . 12 4.4.4Thermal level alarm threshold 14 4.4.5Binary output signals . 15 4.5General . 15 4.5.1Operate (trip) output signal 15 4.5.2Alarm signal 15 4.5.3Other binary output signals 15 4.5.4Additional influencing factors on thermal protection . 16 4.6General . 16 4.6.1Influenc
21、e of ambient temperature on thermal protection . 16 4.6.2Thermal reset facilities 16 4.6.3Behaviour of thermal protective device during auxiliary power supply failure . 17 4.75 Performance specification 17 Accuracy related to the characteristic quantity . 17 5.1Accuracy related to the operate time .
22、 17 5.2Performance during frequency variations . 18 5.36 Functional test methodology . 18 General . 18 6.1Determination of steady-state errors related to the operating current value . 19 6.2Determination of steady-state errors related to the characteristic quantity and 6.3the operate time 19 Accurac
23、y determination of the cold curve . 19 6.3.1Accuracy determination of the hot curves 20 6.3.2Performance with specific cooling thermal time constant . 21 6.4Performance with harmonics . 22 6.5Performance during frequency variations . 22 6.6Performance during different ambient temperatures 23 6.77 Do
24、cumentation requirements 24 Type test report . 24 7.1Other user documentation . 24 7.2Annex A (informative) Simple first-order thermal model of electrical equipment 26 Annex B (informative) Thermal electrical relays which use temperature as setting parameters . 41 Bibliography 46 60255-149 IEC:2013
25、3 Figure 1 Simplified thermal protection function block diagram 9 Figure 2 Typical examples of characteristic curves for cold state of a first-order thermal system with no previous load before overload occurs . 13 Figure 3 Typical examples of characteristic curves for hot states of a first-order the
26、rmal system for different values of previous load before overload occurs . 14 Figure A.1 An electrical equipment to be thermally protected represented as a simple first-order thermal system 26 Figure A.2 Equivalence between a first-order thermal system and an electric parallel RC circuit 30 Figure A
27、.3 Analogue thermal circuit representation of a simple first-order thermal system 31 Figure A.4 Analogue thermal circuit representation of a simple first-order thermal system motor starting condition 31 Figure A.5 Analogue thermal circuit representation of a simple first-order thermal system motor s
28、topped condition . 31 Figure A.6 Dynamic step response of a simple first-order thermal system algorithm to a current below pickup 33 Figure A.7 Dynamic step response of a first-order thermal system (cold initial state) . 34 Figure A.8 Dynamic step response of a first-order thermal system (hot initia
29、l state) . 34 Figure A.9 Dynamic step response of a first-order thermal system to a load current followed by an overload current (initial state: cold) 35 Figure A.10 Dynamic step response of a first-order thermal system to a load current followed by an overload current (initial state: hot) . 35 Tabl
30、e 1 Limiting error as multiples of assigned error 18 Table 2 Test points of the cold curve . 20 Table 3 Test points of the hot curve . 21 Table 4 Test points of the cold curve with harmonics . 22 Table 5 Test points of the cold curve during frequency variations 22 Table A.1 Thermal and electrical mo
31、dels 30 Table A.2 Thermal insulation classes and maximum temperatures, according to IEC 60085. 40 Table A.3 Example of correction factor values (Fa) for class F equipment according to the ambient temperature (Ta) 40 4 60255-149 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MEASURING RELAYS AN
32、D PROTECTION EQUIPMENT Part 149: Functional requirements for thermal electrical relays 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 t
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42、 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 shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60255-149 has
43、been prepared by IEC technical committee 95: Measuring relays and protection equipment. This first edition cancels and replaces IEC 60255-8, published in 1990. The text of this standard is based on the following documents: FDIS Report on voting 95/313/FDIS 95/317/RVD Full information on the voting f
44、or the approval of this standard 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. 60255-149 IEC:2013 5 A list of all parts of IEC 60255 series, under the general title Measuring relays and protecti
45、on equipment, can be found on the IEC website. Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition. The committee has decided that the contents of this publication will remain unc
46、hanged 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. IMPORTANT The colour inside logo on the cover page of
47、this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 60255-149 IEC:2013 MEASURING RELAYS AND PROTECTION EQUIPMENT Part 149: Functional requirements for
48、 thermal electrical relays 1 Scope This part of the IEC 60255 series specifies minimum requirements for thermal protection relays. This standard includes specification of the protection function, measurement characteristics and test methodologies. The object of this standard is to establish a common
49、 and reproducible reference for evaluating dependent time relays which protect equipment from thermal damage by measuring a.c. current flowing through the equipment. Complementary input energizing quantities such as ambient, coolant, top oil and winding temperature may be applicable for the thermal protection specification set forth in this standard. This standard covers protection relays based on a thermal
