1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationMeasuring relays and protection equipmentPart 151: Functional requirements for over/under current protectionBS EN 60255-151:2009National forewordThis British Standard is the UK i
2、mplementation of EN 60255-151:2009. It is identical to IEC 60255-151:2009. Together with BS EN 60255-127, it will supersede BS EN 60255-3:1998 which will be withdrawn on the publication of BS EN 60255-127.The UK participation in its preparation was entrusted to Technical CommitteePEL/95, Measuring r
3、elays and protection systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 59473 1ICS 2
4、9.120.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 August 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60255-15
5、1:2009EUROPEAN STANDARD EN 60255-151 NORME EUROPENNE EUROPISCHE NORM October 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels
6、2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60255-151:2009 E ICS 29.120.70 Supersedes EN 60255-3:1998 + corr. Jan.1998English version Measuring relays and protection equipment - Part 151: Functional requirements for over/
7、under current protection (IEC 60255-151:2009) Relais de mesure et dispositifs de protection - Partie 151: Exigences fonctionnelles pour les protections maximum et minimum de courant (CEI 60255-151:2009) Messrelais und Schutzeinrichtungen - Teil 151: Funktionsanforderungen fr ber-/Unterstromschutz (I
8、EC 60255-151:2009) This European Standard was approved by CENELEC on 2009-09-01. CENELEC 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 a
9、nd bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 respo
10、nsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany
11、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 60255-151:2009 - 2 - Foreword The text of document 95/255/FDIS, future edition 1 of IEC 6025
12、5-151, prepared by IEC TC 95, Measuring relays and protection equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60255-151 on 2009-09-01. This European Standard supersedes EN 60255-3:1998 + corrigendum January 1998. The following dates were fixed: latest date
13、 by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2010-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-09-01 Annex ZA has been added by CENELEC. _ Endorsement not
14、ice The text of the International Standard IEC 60255-151:2009 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 standards indicated: IEC 60044 NOTE Harmonized in EN 60044 series (partially
15、modified). IEC 60255-8 NOTE Harmonized as EN 60255-8:1998 (modified). IEC 61850 NOTE Harmonized in EN 61850 series (not modified). IEC 61850-7-4 NOTE Harmonized as EN 61850-7-4:2003 (not modified). _ BS EN 60255-151:2009- 3 - EN 60255-151:2009 Annex ZA (normative) Normative references to internation
16、al publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendme
17、nts) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-447 200X1)International Electrotechnical Vocabulary - Part 447: Measuring relays - - IEC 60255-1 -2)Measuring re
18、lays and protection equipment - Part 1: Common requirements EN 60255-1 200X3)1)To be published. 2)Undated reference. 3)To be ratified. BS EN 60255-151:2009 2 60255-151 IEC:2009 CONTENTS 1 Scope and object6 2 Normative references .6 3 Terms and definitions .6 4 Specification of the function8 4.1 Gene
19、ral .8 4.2 Input Energizing quantities / 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 outp
20、ut signals16 4.6 Additional influencing 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.
21、4.1 Transient overreach.19 5.4.2 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
22、Accuracy of setting (start) value 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 Transi
23、ent overreach.24 6.5.3 Overshoot 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 cha
24、racteristics .29 Annex B (informative) Reset time determination for relays with trip output only30 Bibliography31 BS EN 60255-151:200960255-151 IEC:2009 3 Figure 1 Simplified protection function block diagram.8 Figure 2 Overcurrent independent time characteristic 10 Figure 3 Undercurrent independent
25、 time characteristic 10 Figure 4 Dependent time characteristic 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 tim
26、e reset characteristic (alternative solution with instantaneous 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 re
27、set time determination .30 Table 1 Multiplier factor 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
28、6 Test points for undercurrent elements .24 Table 7 Recommended values for the test .26 Table A.1 Constants for dependent time operating and reset characteristics29 BS EN 60255-151:2009 6 60255-151 IEC:2009 MEASURING RELAYS AND PROTECTION EQUIPMENT Part 151: Functional requirements for over/under cu
29、rrent protection 1 Scope and object This part of IEC 60255 specifies minimum requirements for over/under current relays. This standard includes a specification of the protection function, measurement characteristics and time delay characteristics. This part of IEC 60255 defines the influencing facto
30、rs that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The test methodologies for verifying performance characteristics and accuracy are also included in this standard. The over/under current functions covered by this standard are the fol
31、lowing: IEEE/ANSI C37.2 IEC 61850-7-4 Function Numbers Logical nodesInstantaneous phase overcurrent protection 50 PIOC Time 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
32、 current unbalance protection 46 PTOC Phase undercurrent protection 37 PTUC Voltage-dependent overcurrent protection 51V PVOC 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.
33、 2 Normative references The following referenced documents are indispensable for the application 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. IEC 60050-447, Internatio
34、nal Electrotechnical Vocabulary Part 447: Measuring relays IEC 60255-1, Measuring relays and protection equipment Part 1: Common 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 quan
35、tity curve which represents the relationship between the theoretical specified operate time and the characteristic quantity BS EN 60255-151:200960255-151 IEC:2009 7 3.2 curves of maximum and minimum limits of the operate time curves of the limiting errors on either side of the theoretical time versu
36、s characteristic quantity which identify the maximum and minimum operate times corresponding to each value of the characteristic quantity 3.3 setting value (start) of the characteristic quantity GSreference value used for the definition of the theoretical curve of time versus characteristic quantity
37、 3.4 threshold value of the characteristic quantity GTlowest value and highest value for dependent time overcurrent and undercurrent relays, respectively, of the input quantity for which the relay is guaranteed to operate 3.5 start time duration of the time interval between the instant when the char
38、acteristic quantity of the measuring relay in reset condition is changed, under specified conditions, and the instant when the start signal asserts 3.6 operate time duration of the time interval between the instant when the characteristic quantity of the measuring relay in reset condition is changed
39、, under specified conditions, and the instant when the relay operates IEV 447-05-05 3.7 disengaging time duration of the time interval between the instant a specified change is made in the value of input energizing quantity which will cause the relay to disengage and instant it disengages IEV 447-05
40、-10, modified 3.8 reset time duration of the time interval between the instant when the characteristic quantity of the measuring relay in operate condition is changed, under specified conditions, and the instant when the relay resets IEV 447-05-06 3.9 overshoot time difference between the operate ti
41、me of the relay at the specified value of the input energizing quantity and the maximum duration of the value of input energizing quantity which, when suddenly reduced (for the overcurrent relay)/increased (for the undercurrent relay) to a specified value below (for the overcurrent relay)/above(for
42、the undercurrent relay) the setting value is insufficient to cause operation 3.10 time multiplier setting TMS setting which describes an adjustable factor that may be provided by a relay manufacturer which is applicable to the theoretical curve of time versus characteristic quantity BS EN 60255-151:
43、2009 8 60255-151 IEC:2009 NOTE Its purpose is to allow adjustment of the relay operating times. This adjustable TMS factor is usually expressed in “per unit”. The preferred reference setting of TMS for declaration of relay characteristic is 1,0. 3.11 threshold of independent time operation GDvalue o
44、f the characteristic quantity at which the relay operate time changes from dependent time operation to independent time operation 3.12 reset ratio disengaging ratio ratio between the point where the relay just ceases to start (start signal changes from ON to OFF) and the actual start current of the
45、element NOTE It is usually defined as a percentage such that for an overcurrent element the reset ratio is less than 100 % and for an undercurrent element the reset ratio is greater than 100 %. 3.13 transient overreach measure of the effect of the d.c. component of a waveform on the start signal of
46、the functional element. Generally this d.c. component will result in the relay reaching further than the setting should permit, or specifically in the terms of an overcurrent relay, starting at a value of a.c. current below the set threshold 4 Specification of the function 4.1 General The protection
47、 function with its inputs, outputs, measuring element, time delay characteristics and functional logic is shown in Figure 1. The manufacturer shall provide the functional block diagram of the specific implementation. Figure 1 Simplified protection function block diagram 4.2 Input Energizing quantiti
48、es / energizing quantities The input energizing quantities are the measuring signals, e.g. currents and voltages (if required). Their ratings and relevant standards are specified in IEC 60255-1. Input energizing quantities can come with wires from current and voltage transformers or as a data packet
49、 over a communication port using an appropriate communication protocol (such as IEC 61850-9-2). IEC 1705/09 BS EN 60255-151:200960255-151 IEC:2009 9 The energizing quantities used by the protection function need not be directly the current at the secondary side of the current transformers. Therefore, the measuring relay documentation shall state the type of energizing quantities used by the protection function. Examples are: single phase current
