EN 61869-2-2012 en Instrument transformers - Part 2 Additional requirements for current transformers.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationInstrument transformersPart 2: Additional requirements for current transformersBS EN 61869-2:2012National forewordThis British Standard is the UK implementation of EN 61869-2:201

2、2. It isidentical to IEC 61869-2:2012. It supersedes BS EN 60044-1:1999 and BS EN 60044-6:1999, which are withdrawn.The UK participation in its preparation was entrusted to Technical CommitteePEL/38, Instrument transformers.A list of organizations represented on this committee can be obtained onrequ

3、est to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012 Published by BSI Standards Limited 2012 ISBN 978 0 580 59139 6 ICS 17.220.20Compliance with a British

4、 Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61869-2:2012EUROPEAN STANDARD EN 61869

5、-2 NORME EUROPENNE EUROPISCHE NORM November 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploi

6、tation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61869-2:2012 E ICS 17.220.20 Supersedes EN 60044-1:1999 + A1:2000 + A2:2003, EN 60044-6:1999English version Instrument transformers - Part 2: Additional requirements for current transformers (IEC 61869-2:2012) Tr

7、ansformateurs de mesure - Partie 2: Exigences supplmentaires concernant les transformateurs de courant(CEI 61869-2:2012) Messwandler - Teil 2: Zustzliche Anforderungen fr Stromwandler (IEC 61869-2:2012) This European Standard was approved by CENELEC on 2012-10-23. CENELEC members are bound to comply

8、 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 and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC M

9、anagement Centre 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 responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has

10、the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv

11、ia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 61869-2:2012EN 61869-2:2012 - 2 - Foreword The text of document 38/435/FDIS, future edition 1 of IEC 61869-2, prepared by IEC/TC

12、38, “Instrument transformers“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61869-2:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2

13、013-07-23 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-10-23 This document supersedes EN 60044-1:1999 + A1:2000 + A2:2003 and EN 60044-6:1999. Additionally it introduces technical innovations in the standardization and adaptation of the re

14、quirements for current transformers for transient performance. This Part 2 is to be used in conjunction with, and is based on, EN 61869-1:2009, General Requirements however the reader is encouraged to use its most recent edition. This Part 2 follows the structure of EN 61869-1:2009 and supplements o

15、r modifies its corresponding clauses. When a particular clause/subclause of Part 1 is not mentioned in this Part 2, that clause/subclause applies as far as is reasonable. When this standard states “addition”, “modification” or “replacement”, the relevant text in Part 1 is to be adapted accordingly.

16、For additional clauses, subclauses, figures, tables, annexes or notes, the following numbering system is used: clauses, subclauses, tables, figures and notes that are numbered starting from 201 are additional to those in Part 1; additional annexes are lettered 2A, 2B, etc. Annex ZZ of EN 61869-1 is

17、not applicable for this part of the series. An overview of the planned set of standards at the date of publication of this document is given below. The updated list of standards prepared by IEC TC38 is available at the website: www.iec.ch; the updated list of standards prepared by IEC TC38 and appro

18、ved by CENELEC is available at the website: www.cenelec.eu. BS EN 61869-2:2012- 3 - EN 61869-2:2012 PRODUCT FAMILY STANDARDS PRODUCT STANDARD PRODUCTS OLD STANDARD 61869-1 GENERAL REQUIREMENTS FOR INSTRUMENT TRANSFORMERS 61869-2 ADDITIONAL REQUIREMENTS FOR CURRENT TRANSFORMERS 60044-1 61869-3 ADDITI

19、ONAL REQUIREMENTS FOR INDUCTIVE VOLTAGE TRANSFORMERS 60044-2 61869-4 ADDITIONAL REQUIREMENTS FOR COMBINED TRANSFORMERS 60044-3 61869-5 ADDITIONAL REQUIREMENTS FOR CAPACITIVE VOLTAGE TRANSFORMERS 60044-5 61869-6 ADDITIONAL GENERAL REQUIREMENT FOR ELECTRONIC INSTRUMENT TRANSFORMERS AND LOW POWER STAND

20、 ALONE SENSORS 61869-7 ADDITIONAL REQUIREMENTS FOR ELECTRONIC VOLTAGE TRANSFORMERS 60044-7 61869-8 ADDITIONAL REQUIREMENTS FOR ELECTRONIC CURRENT TRANSFORMERS 60044-8 61869-9 DIGITAL INTERFACE FOR INSTRUMENT TRANSFORMERS 61869-10 ADDITIONAL REQUIREMENTS FOR LOW-POWER STAND-ALONE CURRENT SENSORS 6186

21、9-11 ADDITIONAL REQUIREMENTS FOR LOW POWER STAND ALONE VOLTAGE SENSOR 60044-7 61869-12 ADDITIONAL REQUIREMENTS FOR COMBINED ELECTRONIC INSTRUMENT TRANSFORMER OR COMBINED STAND ALONE SENSORS 61869-13 STAND ALONE MERGING UNIT Since the publication of EN 60044-6 (Requirements for protective current tra

22、nsformers for transient performance) in 1999, the area of application of this kind of current transformers has been extended. As a consequence, the theoretical background for the dimensioning according to the electrical requirements has become much more complex. In order to keep this standard as use

23、r-friendly as possible, the explanation of the background information will be transferred to the Technical Report IEC/TR 61869-100, which is now in preparation. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN sh

24、all not be held responsible for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 61

25、869-2:2012 was approved by CENELEC as a European Standard without any modification. BS EN 61869-2:2012EN 61869-2:2012 - 4 - Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normati

26、vely referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by comm

27、on modifications, indicated by (mod), the relevant EN/HD applies. Addition to Annex ZA of EN 61869-1:2009: Publication Year Title EN/HD Year IEC 61869-1 (mod) 2007 Instrument transformers - Part 1: General requirements EN 61869-1 2009 BS EN 61869-2:2012 2 61869-2 IEC:2012 CONTENTS 1 Scope . 8 2 Norm

28、ative references . 8 3 Terms and definitions . 8 3.1 General definitions 8 3.3 Definitions related to current ratings 9 3.4 Definitions related to accuracy 10 3.7 Index of abbreviations . 18 5 Ratings . 20 5.3 Rated insulation levels 20 5.3.2 Rated primary terminal insulation level . 20 5.3.5 Insula

29、tion requirements for secondary terminals . 20 5.3.201 Inter-turn insulation requirements . 20 5.5 Rated output . 20 5.5.201 Rated output values . 20 5.5.202 Rated resistive burden values 20 5.6 Rated accuracy class 21 5.6.201 Measuring current transformers 21 5.6.202 Protective current transformers

30、 22 5.6.203 Class assignments for selectable-ratio current transformers . 26 5.201 Standard values for rated primary current . 26 5.202 Standard values for rated secondary current . 27 5.203 Standard values for rated continuous thermal current . 27 5.204 Short-time current ratings . 27 5.204.1 Rated

31、 short-time thermal current (Ith) . 27 5.204.2 Rated dynamic current (Idyn) 27 6 Design and construction . 27 6.4 Requirements for temperature rise of parts and components 27 6.4.1 General 27 6.13 Markings . 27 6.13.201 Terminal markings 27 6.13.202 Rating plate markings . 28 7 Tests 30 7.1 General

32、30 7.1.2 Lists of tests . 30 7.2 Type tests . 31 7.2.2 Temperature-rise test . 31 7.2.3 Impulse voltage withstand test on primary terminals . 33 7.2.6 Tests for accuracy 33 7.2.201 Short-time current tests 35 7.3 Routine tests 36 7.3.1 Power-frequency voltage withstand tests on primary terminals . 3

33、6 7.3.5 Tests for accuracy 36 7.3.201 Determination of the secondary winding resistance (Rct) . 38 7.3.202 Determination of the secondary loop time constant (Ts) 38 BS EN 61869-2:201261869-2 IEC:2012 3 7.3.203 Test for rated knee point e.m.f. (Ek) and exciting current at Ek39 7.3.204 Inter-turn over

34、voltage test 39 7.4 Special tests . 40 7.4.3 Measurement of capacitance and dielectric dissipation factor . 40 7.4.6 Internal arc fault test 40 7.5 Sample tests . 41 7.5.1 Determination of the remanence factor . 41 7.5.2 Determination of the instrument security factor (FS) of measuring current trans

35、formers 41 Annex 2A (normative) Protective current transformers classes P, PR . 42 Annex 2B (normative) Protective current transformer classes for transient performance . 47 Annex 2C (normative) Proof of low-leakage reactance type . 63 Annex 2D (informative) Technique used in temperature rise test o

36、f oil-immersed transformers to determine the thermal constant by an experimental estimation . 64 Annex 2E (informative) Alternative measurement of the ratio error () 66 Annex 2F (normative) Determination of the turns ratio error . 68 Figure 201 Duty cycles 15 Figure 202 Primary time constant TP16 Fi

37、gure 203 Secondary linked flux for different fault inception angles 17 Figure 2A.1 Vector Diagram . 42 Figure 2A.2 Error triangle . 43 Figure 2A.3 Typical current waveforms 44 Figure 2A.4 Basic circuit for 1:1 current transformer 44 Figure 2A.5 Basic circuit for current transformer with any ratio. 4

38、5 Figure 2A.6 Alternative test circuit . 45 Figure 2B.1 Short-circuit current for two different fault inception angles . 48 Figure 2B.2 max(t) as the curve of the highest flux values, considering all relevant fault inception angles . 48 Figure 2B.3 Relevant time ranges for calculation of transient f

39、actor . 49 Figure 2B.4 Determination of Ktf in time range 1 at 50 Hz for Ts = 1,8 s . 50 Figure 2B.5 Determination of Ktf in time range 1 at 60 Hz for Ts = 1,5 s . 50 Figure 2B.6 Determination of Ktf in time range 1 at 16,7 Hz for Ts = 5.5 s . 50 Figure 2B.7 Limiting the magnetic flux by considering

40、 core saturation 52 Figure 2B.8 Basic circuit 53 Figure 2B.9 Determination of remanence factor by hysteresis loop 55 Figure 2B.10 Circuit for d.c. method . 56 Figure 2B.11 Time-amplitude and flux-current diagrams 56 Figure 2B.12 Recordings with shifted flux base line . 57 Figure 2B.13 Circuit for ca

41、pacitor discharge method 58 Figure 2B.14 Typical records for capacitor discharge method 59 Figure 2B.15 Measurement of error currents 60 Figure 2D.1 Graphical extrapolation to ultimate temperature rise . 65 Figure 2E.1 Simplified equivalent circuit of the current transformer 66 BS EN 61869-2:2012 4

42、61869-2 IEC:2012 Table 201 Limits of ratio error and phase displacement for measuring current transformers (classes 0,1 to 1) 21 Table 202 Limits of ratio error and phase displacement for measuring current transformers (classes 0,2S and 0,5S) . 22 Table 203 Limits of ratio error for measuring curren

43、t transformers (classes 3 and 5) 22 Table 204 Characterisation of protective classes . 23 Table 205 Error limits for protective current transformers class P and PR 23 Table 206 Error limits for TPX, TPY and TPZ current transformers. 25 Table 207 Specification Methods for TPX, TPY and TPZ current tra

44、nsformers . 26 Table 208 Marking of terminals 28 Table 10 List of tests . 31 BS EN 61869-2:2012 8 61869-2 IEC:2012 INSTRUMENT TRANSFORMERS Part 2: Additional requirements for Current Transformers 1 Scope This part of IEC 61869 is applicable to newly manufactured inductive current transformers for us

45、e with electrical measuring instruments and/or electrical protective devices having rated frequencies from 15 Hz to 100 Hz. 2 Normative references Clause 2 of IEC 61869-1:2007 is applicable with the following additions: IEC 61869-1:2007, Instrument Transformers Part 1: General requirements 3 Terms a

46、nd definitions For the purposes of this document, the terms and definitions in IEC 61869-1:2007 apply with the following additions: 3.1 General definitions 3.1.201 current transformer instrument transformer in which the secondary current, under normal conditions of use, is substantially proportional

47、 to the primary current and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections SOURCE: IEC 60050-321:1986, 321-02-01 3.1.202 measuring current transformer current transformer intended to transmit an information signal to measuring instrum

48、ents and meters SOURCE: IEC 60050-321:1986, 321-02-18 3.1.203 protective current transformer a current transformer intended to transmit an information signal to protective and control devices SOURCE: IEC 60050-321: 1986, 321-02-19) 3.1.204 class P protective current transformer protective current tr

49、ansformer without remanent flux limit, for which the saturation behaviour in the case of a symmetrical short-circuit is specified 3.1.205 class PR protective current transformer protective current transformer with remanent flux limit, for which the saturation behaviour in the case of a symmetrical short-circuit is specified BS EN 61869-2:201261869-2 IEC:2012 9 3.1.206 class PX protective current transformer protective current transformer o