1、BRITISH STANDARD BS EN 60044-8:2002 Instrument transformers Part 8: Electronic current transformers The European Standard EN 60044-8:2002 has the status of a British Standard ICS 17.220.20 BS EN 60044-8:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sect
2、or Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 4 October 2002 BSI 4 October 2002 ISBN 0 580 40495 1 National foreword This British Standard is the official English language version of EN 60044-8:2002. It is identical with IEC 600
3、44-8:2002. The UK participation in its preparation was entrusted to Technical Committee PEL/38, Instrument transformers, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which im
4、plement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication
5、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Euro
6、pean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pa
7、ges 2 to 129 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60044-8 NORME EUROPENNE EUROPISCHE NORM September 2002 CENELEC European Committee for Electrote
8、chnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No.
9、EN 60044-8:2002 E ICS 17.220.20 English version Instrument transformers Part 8: Electronic current transformers (IEC 60044-8:2002) Transformateurs de mesure Partie 8: Transformateurs de courant lectroniques (CEI 60044-8:2002) Messwandler Teil 8: Elektronische Stromwandler (IEC 60044-8:2002) This Eur
10、opean Standard was approved by CENELEC on 2002-09-01. 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 and bibliographical referenc
11、es 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 responsibility of a CENELEC memb
12、er 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Ma
13、lta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 38/280/FDIS, future edition 1 of IEC 60044-8, prepared by IEC TC 38, Instrument transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 600
14、44-8 on 2002-09-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2003-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2
15、005-09-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes D and ZA are normative and annexes A, B, C and E are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The tex
16、t of the International Standard IEC 60044-8:2002 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 60038 NOTE Harmonized as HD 472 S1:1989 (modified). IEC 60068-2 S
17、eries NOTE Harmonized in EN 60068-2/HD 323.2 Series (not modified). IEC 60071-2 NOTE Harmonized as EN 60071-2:1997 (not modified). IEC 60255-24 NOTE Harmonized as EN 60255-24:2001 (not modified). IEC 60270 NOTE Harmonized as EN 60270:2001 (not modified). IEC 60437 NOTE Harmonized as EN 60437:1997 (n
18、ot modified). IEC 60567 NOTE Harmonized as EN 60567:1992 (not modified). IEC 60599 NOTE EN 60599:1999 is based on IEC 60599:1999 (not modified). IEC 60721-2-2 NOTE Harmonized as HD 478.2.2 S1:1990 (not modified). IEC 60721-2-4 NOTE Harmonized as HD 478.2.4 S1:1989 (not modified). IEC 61508-1 NOTE Ha
19、rmonized as EN 61508-1:2001 (not modified). IEC 61508-3 NOTE Harmonized as EN 61508-3:2001 (not modified). IEC 61754-1 NOTE Harmonized as EN 61754-1:1997 (not modified). IEC 61754-15 NOTE Harmonized as EN 61754-15:2001 (not modified). Page2 EN600448:2002-440068 (2002:CEI)E 3 CONTENTS 1 Scope.7 1.1 G
20、eneral .7 1.2 General block diagram of electronic current transformers.8 1.3 General block diagram of electronic transformers with a digital output9 2 Normative references9 3 Definitions 12 3.1 General definitions.12 3.2 Additional definitions for measuring electronic current transformers .19 3.3 Ad
21、ditional definitions for protective electronic current transformers.19 3.4 Additional definitions for digital output22 3.5 Additional definitions for analogue voltage output.23 3.6 Index of main definitions and abbreviations23 4 Normal and special service conditions.24 4.1 General .24 4.2 Normal ser
22、vice conditions25 4.3 Special service conditions26 4.4 System earthing.28 5 Ratings.28 5.1 General ratings28 5.2 Standard values for rated phase offset.32 5.3 Rating for digital output32 5.4 Rating for analogue voltage output.33 6 Design requirements.34 6.1 General design requirements .34 6.2 Design
23、 requirements for digital output43 6.3 Design requirements for analogue voltage output.60 7 Classification of tests60 7.1 General .60 7.2 Type tests .60 7.3 Routine tests .61 7.4 Special tests62 8 Type test 62 8.1 Short-time current tests .62 8.2 Temperature-rise test 63 8.3 Impulse tests on primary
24、 terminals.63 8.4 Wet test for outdoor type electronic current transformers .65 8.5 RIV tests .65 8.6 Transmitted overvoltage test65 8.7 Low-voltage components voltage withstand test .66 8.8 EMC tests67 8.9 Accuracy test.70 8.10 Additional accuracy tests for protective electronic current transformer
25、s 72 8.11 Verification of the protection 72 8.12 Tightness tests 73 8.13 Vibration tests .73 8.14 Additional type test for digital output.74 Page3 EN600448:2002 4 -440068 (2002:CEI)E 9 Routine tests 75 9.1 Verification of terminal markings75 9.2 Power-frequency withstand tests on primary terminals a
26、nd partial discharge measurement .75 9.3 Power-frequency voltage withstand test for low-voltage components 75 9.4 Accuracy tests.75 9.5 Tightness tests 75 9.6 Additional routine tests for digital output.76 9.7 Additional routine tests for analogue output76 10 Special tests.76 10.1 Chopped lightning-
27、impulse test on primary terminals76 10.2 Measurement of capacitance and dielectric dissipation factor.76 10.3 Mechanical tests76 10.4 Tests for accuracy versus harmonics .77 10.5 Tests in accordance with the technology applied 78 11 Marking 78 11.1 Terminal marking General rules 78 11.2 Rating plate
28、 markings79 12 Additional requirements for measuring electronic current transformers 82 12.1 Accuracy class designation82 12.2 Limits of current error and phase error at rated frequency 82 12.3 Accuracy requirements on harmonics.83 13 Additional requirements for protective electronic current transfo
29、rmers .83 13.1 Accuracy classes.83 13.2 Accuracy requirements on harmonics.84 14 Information to be given with enquiries, tenders and orders 84 14.1 Designation .84 14.2 Dependability.85 15 Rules for transport, storage and installation 85 15.1 Conditions during transport, storage and installation 86
30、15.2 Installation.86 15.3 Unpacking and lifting .86 15.4 Assembly.86 15.5 Operation 87 15.6 Maintenance87 16 Safety.90 16.1 Electrical aspects 90 16.2 Mechanical aspects .90 16.3 Thermal aspects90 Annex A (informative) Transient performances of ECTs91 Annex B (informative) Technical information for
31、electronic current transformers with digital output 98 Annex C (informative) Technical information for electronic current transformers with analogue output .108 Annex D (normative) Frequency response and accuracy requirements on harmonics for electronic current and voltage transformer.116 Annex E (i
32、nformative) Graph explaining the accuracy requirements 123 Page4 EN600448:2002-440068 (2002:CEI)E 5 Annex ZA (normative) Normative references to international publications with their corresponding European publications124 Bibliography129 Figure 1 General block diagram of a single-phase electronic cu
33、rrent transformer 8 Figure 2 Example of digital interface block diagram 9 Figure 3 Altitude correction factor.27 Figure 4 Manchester coding .43 Figure 5 Characteristics of the optical pulse45 Figure 6 Test circuit for the optical pulse 45 Figure 7 Copper wire interface47 Figure 8 Eye diagram .48 Fig
34、ure 9 Daisy-chain architecture .49 Figure 10 Frame format according to FT3.51 Figure 11 Status word #156 Figure 12 Status word #257 Figure 13 Universal frame 58 Figure 14 Pulse shape for clock input .59 Figure 15 Example of subassembly subjected to EMC tests68 Figure 16 Temperature cycle accuracy te
35、st.71 Figure A.1 Equivalent electrical circuit of the network91 Figure A.2 More complex equivalent electrical circuit during short circuit.92 Figure A.3 Equivalent electrical circuit of magnetic current transformer during short circuit .93 Figure A.4 Magnetic reactance of the a CT without remanence
36、.93 Figure A.5 Magnetic reactance of the CT with remanence.94 Figure A.6 Example of magnetic reactance of the a CT for a TPZ class 95 Figure A.7 Example of the magnetic reactance of a CT for a TPY class 96 Figure B.1 Combination of ECTs and EVTs to form the digital output. .98 Figure B.2 Synchronize
37、d samples of current from bay 1 and bay 2 calculated from non-synchronized samples from bay 1 and bay 2 respectively .101 Figure B.3 Samples from current in bay 1 and 2 sampled synchronized by a common clock .101 Figure B.4 Phase error definition for the digital interface.102 Figure B.5 Test set-up1
38、03 Figure B.6 Comparison of errors in conventional metering systems and systems based on ECTs and EVTs with digital output107 Figure C.1 Test circuit for accuracy measurements in steady state .109 Figure C.2 Iron-core-coil transformer110 Figure C.3 Equivalent circuit of the iron-core current transfo
39、rmer with voltage output 111 Figure C.4 Stand-alone air-core coil .112 Figure C.5 Equivalent circuit of stand-alone air-core current transformer with voltage output 113 Figure C.6 Phasor diagram Stand-alone air-core coil .114 Figure D.1 Digital data acquisition system 118 Figure E.1 Accuracy limits
40、of a multi-purpose ECT123 Page5 EN600448:2002 6 -440068 (2002:CEI)E Table 1 Temperature categories.25 Table 2 Limits of temperature rise of the transformer30 Table 3 DC voltage.31 Table 4 AC voltage.31 Table 5 Rated values for digital output32 Table 6 Low-voltage withstand capability 34 Table 7 Cree
41、page distances for given pollution levels .35 Table 8 Immunity requirements and tests .37 Table 9 Static withstand test loads39 Table 10 The compatible fibre optic transmission system44 Table 11 The compatible copper-wire transmission system for simplex point-to-point link46 Table 12 Data channel ma
42、pping for DatSetName = 01, general application .53 Table 13 Connectors 60 Table 14 Modalities of application of test loads to be applied to the primary terminals .77 Table 15 Markings of terminals.78 Table 16 Rating plate marking80 Table 17 Limits of error 82 Table 18 Limits of error for current tra
43、nsformers for special application.82 Table 19 Limits of error 83 Table 20 Limits of error 84 Table 21 Designation of an electronic current transformer 85 Table B.1 Sample application specific assignment of the data channels with DataSetName = FE H. Application for line protection and synchronization
44、 of 1-beaker arrangements with combined ECTs/EVTs on both sides of the breakers 99 Page6 EN600448:2002-440068 (2002:CEI)E 7 INSTRUMENT TRANSFORMERS Part 8: Electronic current transformers 1 Scope 1.1 General This part of IEC 60044 applies to newly manufactured electronic current transformers having
45、an analogue voltage output or a digital output, for use with electrical measuring instruments and electrical protective devices at nominal frequencies from 15 Hz to 100 Hz. NOTE Additional requirements due to the bandwidth are considered. The accuracy requirements on harmonics are given in annex D.
46、Clause 12 covers the accuracy requirements that are necessary for electronic current transformers for use with electrical measuring instruments. Clause 13 covers the accuracy requirements that are necessary for electronic current transformers for use with electrical protective relays, and particular
47、ly for forms of protection in which the prime requirement is to maintain the accuracy up to several times the rated current. If required, the transient accuracy of an electronic current transformer during fault is also given in this clause. Electronic current transformers intended for both measureme
48、nt and protection should comply with all the clauses of this standard and are called multipurpose electronic current transformers. The transformer technology can be based on optical arrangements equipped with electrical components, on air-core coils (with or without a built-in integrator), or on iro
49、n-core coils with integrated shunt used as a current-to-voltage converter, alone or equipped with electronic components. For analogue output, the electronic current transformer may include the secondary signal cable. Examples of electronic current transformer technologies using air-core coils and iron- core coils with int
