1、 IEC 61869-2 Edition 1.0 2012-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Instrument transformers Part 2: Additional requirements for current transformers Transformateurs de mesure Partie 2: Exigences supplmentaires concernant les transformateurs de courant IEC61869-2:2012 THIS PUBLICATION IS COP
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16、trument transformers Part 2: Additional requirements for current transformers Transformateurs de mesure Partie 2: Exigences supplmentaires concernant les transformateurs de courant INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XB ICS 17.220.20 PRICE CODE CODE P
17、RIX ISBN 978-2-83220-293-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu c
18、ette publication via un distributeur agr. 2 61869-2 IEC:2012 CONTENTS FOREWORD . 5 1 Scope . 8 2 Normative 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 Rating
19、s . 20 5.3 Rated insulation levels 20 5.3.2 Rated primary terminal insulation level . 20 5.3.5 Insulation 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 Rate
20、d accuracy class 21 5.6.201 Measuring current transformers 21 5.6.202 Protective current transformers 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
21、 values for rated continuous thermal current . 27 5.204 Short-time current ratings . 27 5.204.1 Rated 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 Ma
22、rkings . 27 6.13.201 Terminal markings 27 6.13.202 Rating plate markings . 28 7 Tests 30 7.1 General 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
23、 tests 35 7.3 Routine tests 36 7.3.1 Power-frequency voltage withstand tests on primary terminals . 36 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 61869-2 IEC:2012 3 7.3.203 Test fo
24、r rated knee point e.m.f. (Ek) and exciting current at Ek39 7.3.204 Inter-turn overvoltage 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.
25、5.2 Determination of the instrument security factor (FS) of measuring current transformers 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 r
26、eactance type . 63 Annex 2D (informative) Technique used in temperature rise test of 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
27、ratio error . 68 Figure 201 Duty cycles 15 Figure 202 Primary time constant TP16 Figure 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
28、 transformer 44 Figure 2A.5 Basic circuit for current transformer with any ratio. 45 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 in
29、ception angles . 48 Figure 2B.3 Relevant time ranges for calculation of transient factor . 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 a
30、t 16,7 Hz for Ts = 5.5 s . 50 Figure 2B.7 Limiting the magnetic flux by considering 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 F
31、igure 2B.12 Recordings with shifted flux base line . 57 Figure 2B.13 Circuit for capacitor 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.
32、1 Simplified equivalent circuit of the current transformer 66 4 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
33、 0,5S) . 22 Table 203 Limits of ratio error for measuring current 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
34、Table 207 Specification Methods for TPX, TPY and TPZ current transformers . 26 Table 208 Marking of terminals 28 Table 10 List of tests . 31 61869-2 IEC:2012 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INSTRUMENT TRANSFORMERS Part 2: Additional requirements for current transformers FOREWORD 1) The
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44、 or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative 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
45、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. This International Standard IEC 61869-2 Ed.1.0 has been prepared by committee 38: Instrument transformers. This first edition of IEC 61869-2 c
46、ancels and replaces the first edition of IEC 60044-1, published in 1996, and its Amendment 1 (2000) and Amendment 2 (2002), and the first edition of IEC 60044-6, published in 1992. Additionally it introduces technical innovations in the standardization and adaptation of the requirements for current
47、transformers for transient performance. The text of this standard is based on the following documents: FDIS Report on voting 38/435/FDIS 38/437/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. 6 61869-2 IEC:2012 T
48、his publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 61869 series, published under the general title Instrument transformers, can be found on the IEC website. This Part 2 is to be used in conjunction with, and is based on, IEC 61869-1
49、:2007, General Requirements however the reader is encouraged to use its most recent edition. This Part 2 follows the structure of IEC 61869-1:2007 and supplements or 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 “re
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