1、 IEC 60255-151Edition 1.0 2009-08INTERNATIONAL STANDARD NORME INTERNATIONALEMeasuring relays and protection equipement Part 151: Functional requirements for over/under current protection Relais de mesure et dispositifs de protection Partie 151: Exigences fonctionnelles pour les protections minimum e
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16、estions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60255-151Edition 1.0 2009-08INTERNATIONAL STANDARD NORME INTERNATIONALEMeasuring relays and protection equipement Part 151: Functional requirements for over/under current pr
17、otection Relais de mesure et dispositifs de protection Partie 151: Exigences fonctionnelles pour les protections minimum et maximum de courant INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE VICS 29.120.70 PRICE CODECODE PRIXISBN 2-8318-1060-0 Registered trademar
18、k of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60255-151 IEC:2009 CONTENTS FOREWORD.4 1 Scope and object6 2 Normative references .6 3 Terms and definitions .6 4 Specification of the function8 4.1 General .8 4.2 Input Energizing quan
19、tities / energizing quantities .8 4.3 Binary input signals .9 4.4 Functional logic .9 4.4.1 Operating characteristics.9 4.4.2 Reset characteristics .12 4.5 Binary output signals.16 4.5.1 Start (pick-up) signal .16 4.5.2 Operate (trip) signal.16 4.5.3 Other binary output signals16 4.6 Additional infl
20、uencing functions/conditions 16 4.7 Specific characteristics16 5 Performance specification 17 5.1 Accuracy related to the characteristic quantity.17 5.2 Accuracy related to the operate time .18 5.3 Accuracy related to the reset time .18 5.4 Transient performance 19 5.4.1 Transient overreach.19 5.4.2
21、 Overshoot time 19 5.4.3 Response to time varying value of the characteristic quantity 19 5.5 Current transformer requirements19 6 Functional test methodology.20 6.1 General .20 6.2 Determination of steady state errors related to the characteristic quantity .20 6.2.1 Accuracy of setting (start) valu
22、e 20 6.2.2 Reset ratio determination.22 6.3 Determination of steady state errors related to the start and operate time .23 6.4 Determination of steady state errors related to the reset time23 6.5 Determination of transient performance.24 6.5.1 General .24 6.5.2 Transient overreach.24 6.5.3 Overshoot
23、 time 25 6.5.4 Response to time varying value of the characteristic quantity for dependent time relays .26 7 Documentation requirements 27 7.1 Type test report.27 7.2 Other user documentation .27 Annex A (normative) Constants for dependent time operating and reset characteristics .29 Annex B (inform
24、ative) Reset time determination for relays with trip output only30 Bibliography31 60255-151 IEC:2009 3 Figure 1 Simplified protection function block diagram.8 Figure 2 Overcurrent independent time characteristic 10 Figure 3 Undercurrent independent time characteristic 10 Figure 4 Dependent time char
25、acteristic 11 Figure 5 Definite time reset characteristic 13 Figure 6 Definite time reset characteristic (alternative solution with instantaneous reset after relay operation)14 Figure 7 Dependent time reset characteristic .15 Figure 8 Dependent time reset characteristic (alternative solution with in
26、stantaneous reset after relay operation)16 Figure 9 Voltage restrained characteristics 17 Figure 10 Voltage controlled characteristics.17 Figure 11 Typical test waveform for transient overreach 25 Figure 12 Test waveform .26 Figure B.1 Dependent reset time determination .30 Table 1 Multiplier factor
27、 on operated time assigned error.18 Table 2 Multiplier factor on reset time assigned error.19 Table 3 Test points for overcurrent elements .23 Table 4 Test points for undercurrent elements .23 Table 5 Test points for overcurrent elements .24 Table 6 Test points for undercurrent elements .24 Table 7
28、Recommended values for the test .26 Table A.1 Constants for dependent time operating and reset characteristics29 4 60255-151 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MEASURING RELAYS AND PROTECTION EQUIPEMENT Part 151: Functional requirements for over/under current protection FOREWORD 1)
29、 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 questions concerning standardization in the electrical
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38、ive references cited in this publication. Use of the referenced publications is indispensable 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 respons
39、ible for identifying any or all such patent rights. International Standard IEC 60255-151 has been prepared by IEC technical committee 95: Measuring relays and protection equipment. This first edition cancels and replaces IEC 60255-3, published in 1989. The text of this standard is based on the follo
40、wing documents: FDIS Report on voting 95/255/FDIS 95/258/RVD Full information on the voting for 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. 60255-151 IEC:2009 5 A
41、 list of all parts of the IEC 60255 series, published under the general title Measuring relays and protection 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 th
42、e time of the next edition. The committee has decided that the contents of this publication will remain 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 recon
43、firmed; withdrawn; replaced by a revised edition; or amended. 6 60255-151 IEC:2009 MEASURING RELAYS AND PROTECTION EQUIPEMENT Part 151: Functional requirements for over/under current protection 1 Scope and object This part of IEC 60255 specifies minimum requirements for over/under current relays. Th
44、is standard includes a specification of the protection function, measurement characteristics and time delay characteristics. This part of IEC 60255 defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The te
45、st methodologies for verifying performance characteristics and accuracy are also included in this standard. The over/under current functions covered by this standard are the following: IEEE/ANSI C37.2 IEC 61850-7-4 Function Numbers Logical nodesInstantaneous phase overcurrent protection 50 PIOC Time
46、 delayed phase overcurrent protection 51 PTOC Instantaneous earth fault protection 50N/50G PIOC Time delayed earth fault protection 51N/51G PTOC Negative sequence overcurrent or current unbalance protection 46 PTOC Phase undercurrent protection 37 PTUC Voltage-dependent overcurrent protection 51V PV
47、OC This standard excludes thermal electrical relays as specified in IEC 60255-8. General requirements for measuring relays and protection equipment are specified in IEC 60255-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For date
48、d references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-447, International Electrotechnical Vocabulary Part 447: Measuring relays IEC 60255-1, Measuring relays and protection equipment Part 1: C
49、ommon requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 theoretical curve of time versus characteristic quantity curve which represents the relationship between the theoretical specified operate time and the characteristic quantity 60255-151 IEC:2009 7 3.2 curves of maximum and minimum limits of the operate time c
