BS EN 61869-2:2012:2013 Edition
$215.11
Instrument transformers – Additional requirements for current transformers
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 72 |
IEC 61869-2:2012 is applicable to newly manufactured inductive current transformers for use with electrical measuring instruments and/or electrical protective devices having rated frequencies from 15 Hz to 100 Hz. This International Standard cancels 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 transformers for transient performance. This publication is to be read in conjunction with /2.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | English CONTENTS |
| 10 | 1 Scope 2 Normative references 3 Terms and definitions 3.1 General definitions |
| 11 | 3.3 Definitions related to current ratings |
| 12 | 3.4 Definitions related to accuracy |
| 17 | Figures Figure 201 – Duty cycles |
| 18 | Figure 202 – Primary time constant TP |
| 19 | Figure 203 – Secondary linked flux for different fault inception angles γ |
| 20 | 3.7 Index of abbreviations |
| 22 | 5 Ratings 5.3 Rated insulation levels 5.3.2 Rated primary terminal insulation level 5.3.5 Insulation requirements for secondary terminals 5.3.201 Inter-turn insulation requirements 5.5 Rated output 5.5.201 Rated output values 5.5.202 Rated resistive burden values |
| 23 | 5.6 Rated accuracy class 5.6.201 Measuring current transformers Tables Table 201 – Limits of ratio error and phase displacement for measuring current transformers (classes 0,1 to 1) |
| 24 | 5.6.202 Protective current transformers Table 202 – Limits of ratio error and phase displacement formeasuring current transformers (classes 0,2S and 0,5S) Table 203 – Limits of ratio error for measuringcurrent transformers (classes 3 and 5) |
| 25 | Table 204 – Characterisation of protective classes Table 205 – Error limits for protective current transformers class P and PR |
| 27 | Table 206 – Error limits for TPX, TPY and TPZ current transformers |
| 28 | 5.6.203 Class assignments for selectable-ratio current transformers 5.201 Standard values for rated primary current Table 207 – Specification Methods for TPX, TPY and TPZ current transformers |
| 29 | 5.202 Standard values for rated secondary current 5.203 Standard values for rated continuous thermal current 5.204 Short-time current ratings 5.204.1 Rated short-time thermal current (Ith) 5.204.2 Rated dynamic current (Idyn) 6 Design and construction 6.4 Requirements for temperature rise of parts and components 6.4.1 General 6.13 Markings 6.13.201 Terminal markings |
| 30 | 6.13.202 Rating plate markings Table 208 – Marking of terminals |
| 32 | 7 Tests 7.1 General 7.1.2 Lists of tests |
| 33 | 7.2 Type tests 7.2.2 Temperature-rise test Table 10 – List of tests |
| 35 | 7.2.3 Impulse voltage withstand test on primary terminals 7.2.6 Tests for accuracy |
| 37 | 7.2.201 Short-time current tests |
| 38 | 7.3 Routine tests 7.3.1 Power-frequency voltage withstand tests on primary terminals 7.3.5 Tests for accuracy |
| 40 | 7.3.201 Determination of the secondary winding resistance (Rct) 7.3.202 Determination of the secondary loop time constant (Ts) |
| 41 | 7.3.203 Test for rated knee point e.m.f. (Ek) and exciting current at Ek 7.3.204 Inter-turn overvoltage test |
| 42 | 7.4 Special tests 7.4.3 Measurement of capacitance and dielectric dissipation factor 7.4.6 Internal arc fault test |
| 43 | 7.5 Sample tests 7.5.1 Determination of the remanence factor 7.5.2 Determination of the instrument security factor (FS) of measuring current transformers |
| 44 | Annex 2A (normative) Protective current transformers classes P, PR Figure 2A.1 – Vector Diagram |
| 45 | Figure 2A.2 – Error triangle |
| 46 | Figure 2A.3 – Typical current waveforms Figure 2A.4 – Basic circuit for 1:1 current transformer |
| 47 | Figure 2A.5 – Basic circuit for current transformer with any ratio Figure 2A.6 – Alternative test circuit |
| 49 | Annex 2B (normative) Protective current transformer classesfor transient performance |
| 50 | Figure 2B.1 – Short-circuit current for two different fault inception angles Figure 2B.2 – ψmax(t) as the curve of the highest flux values, considering all relevant fault inception angles γ |
| 51 | Figure 2B.3 – Relevant time ranges for calculation of transient factor |
| 52 | Figure 2B.4 – Determination of Ktfin time range 1 at 50 Hz for Ts = 1,8 s Figure 2B.5 – Determination of Ktfin time range 1at 60 Hz for Ts = 1,5 s Figure 2B.6 – Determination of Ktfin time range 1at 16,7 Hz for Ts = 5,5 s |
| 54 | Figure 2B.7 – Limiting the magnetic flux by considering core saturation |
| 55 | Figure 2B.8 – Basic circuit |
| 57 | Figure 2B.9 – Determination of remanence factor by hysteresis loop |
| 58 | Figure 2B.10 – Circuit for d.c. method Figure 2B.11 – Time-amplitude and flux-current diagrams |
| 59 | Figure 2B.12 – Recordings with shifted flux base line |
| 60 | Figure 2B.13 – Circuit for capacitor discharge method |
| 61 | Figure 2B.14 – Typical records for capacitor discharge method |
| 62 | Figure 2B.15 – Measurement of error currents |
| 65 | Annex 2C (normative) Proof of low-leakage reactance type |
| 66 | Annex 2D (informative) Technique used in temperature rise test of oil-immersed transformers to determine the thermal constant by an experimental estimation |
| 67 | Figure 2D.1 – Graphical extrapolation to ultimate temperature rise |
| 68 | Annex 2E (informative) Alternative measurement of the ratio error (ε) Figure 2E.1 – Simplified equivalent circuit of the current transformer |
| 70 | Annex 2F (normative) Determination of the turns ratio error |
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