IEC 61869-3:2011

IEC 61869-3 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Instrument transformers –
Part 3: Additional requirements for inductive voltage transformers

Transformateurs de mesure –
Partie 3: Exigences supplémentaires concernant les transformateurs inductifs
de tension
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IEC 61869-3 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Instrument transformers –
Part 3: Additional requirements for inductive voltage transformers

Transformateurs de mesure –
Partie 3: Exigences supplémentaires concernant les transformateurs inductifs
de tension
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 17.220.20 ISBN 978-2-88912-544-9

– 2 – 61869-3 © IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 General definitions . 7
3.2 Definitions related to dielectric ratings . 8
3.4 Definitions related to accuracy . 9
3.5 Definitions related to other ratings . 9
3.7 Index of abbreviation . 9
5 Ratings . 9
5.3 Rated insulation levels . 10
5.5 Rated output . 10
5.5.301 Rated output values . 10
5.5.302 Rated thermal limiting output . 10
5.5.303 Rated output values for residual voltage windings . 10
5.5.304 Rated thermal limiting output for residual voltage windings . 10
5.6 Rated accuracy class . 11
5.6.301 Accuracy requirements for single-phase inductive measuring
voltage transformers . 11
5.6.302 Additional requirements for single-phase inductive protective
voltage transformers . 12
5.301 Standard values of rated voltages . 13
5.301.1 Rated primary voltages . 13
5.301.2 Rated secondary voltages . 13
5.301.3 Rated voltages for residual voltage windings . 13
5.302 Standard values of rated voltage factor . 14
6 Design and construction . 15
6.4 Requirements for temperature rise of parts and components . 15
6.4.1 General . 15
6.13 Markings . 15
6.13.301 Terminal markings . 15
6.13.302 Rating plate markings . 19
6.301 Short-circuit withstand capability . 20
7 Tests . 20
7.1 General . 20
7.1.2 List of tests . 20
7.2 Type tests . 21
7.2.2 Temperature-rise test . 21
7.2.3 Impulse voltage withstand test on primary terminals . 22
7.2.5 Electromagnetic Compatibility (EMC) tests . 23
7.2.6 Test for accuracy . 23
7.2.301 Short-circuit withstand capability test . 23
7.3 Routine tests . 24
7.3.1 Power-frequency voltage withstand tests on primary terminals . 24
7.3.2 Partial discharge measurements . 27
7.3.5 Test for accuracy . 27

61869-3 © IEC:2011 – 3 –
7.4 Special tests . 27
7.4.3 Measurement of capacitance and dielectric dissipation factor . 27
7.4.6 Internal arc fault test . 28

Figure 301 – Single-phase transformer with fully insulated terminals and a single
secondary . 16
Figure 302 – Single-phase transformer with a neutral primary terminal with reduced
insulation and a single secondary . 16
Figure 303 – Three-phase assembly with a single secondary . 16
Figure 304 – Single-phase transformer with two secondaries . 17
Figure 305 – Three-phase assembly with two secondaries . 17
Figure 306 – Single-phase transformer with one multi-tap secondary . 17
Figure 307 – Three-phase assembly with one multi-tap secondary . 17
Figure 308 – Single-phase transformer with two multi-tap secondaries . 18
Figure 309 – Single-phase transformer with one residual voltage winding . 18
Figure 310 – Three-phase transformer with one residual voltage winding. 18
Figure 311 – Example of a typical rating plate . 20
Figure 312 – Example of a rating plate with typical data . 20
Figure 313 – Common mode (separate source) test voltage application . 26
Figure 314 – Differential mode (induced) test voltage application – Primary excitation . 26
Figure 315 – Differential mode (induced) test voltage application – Secondary
excitation . 27

Table 301 – Limits of voltage error and phase displacement for measuring voltage
transformers . 11
Table 302 – Limits of voltage error and phase displacement for protective voltage
transformers . 12
Table 303 – Rated voltages for secondary windings intended to produce a residual
voltage . 14
Table 10 – List of tests . 21
Table 305 – Burden ranges for accuracy tests . 23

– 4 – 61869-3 © IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 3: Additional requirements for inductive voltage transformers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical com
...