IEC 61378-1:2011

FOREWORD
1 Scope
2 Normative references
3 Terms, definitions and acronyms
4 Classification
5 Ratings
6 Load loss and voltage drop in transformers and reactors
7 Tests for converter transformers
8 On load noise level with transductors and/or IPT
Annex A (informative) - Determination of transformer
        service load loss at rated non-sinusoidal converter
        current from measurements with rated transformer
        current of fundamental frequency
Annex B (informative) - Short-circuit test currents and
        load losses in transformers for single-way converters
        (total loss injection)
Annex C (informative) - Current sharing measurement
        in high current valve windings
Annex D (informative) - Examples of duty cycles
Annex E (informative) - Guidelines for design review
Annex F (informative) - Determination of loss in
        transformer tank due to magnetic field 3D simulation
        and guidelines for tank losses evaluation and tank
        hotspot calculation
Annex G (informative) - Short-circuit measurements of
        rectifier transformers equipped with built in
        transductors
Annex H (informative) - Determination of the transformer
        voltage ratio and phase displacement by the turn ratio
        measurements
Annex I (informative) - Phase displacement connections
        and terminal indications of converter transformers
Annex J (normative) - Correlation between IEC 61378-1
        and IEC 60146-1-1 ratings
Bibliography

IEC 61378-1:2011 deals with the specification, design and testing of power transformers and reactors which are intended for integration within semiconductor converter plants. The scope of this International Standard is limited to application of power converters of any power rating. Typical applications are:
- thyristor rectifiers for electrolysis;
- diode rectifiers for electrolysis;
- thyristor rectifiers for large drives;
- thyristor rectifiers for scrap melting furnaces, and
- diode rectifiers feeding inverters for variable speed drives. The standard also covers the regulating unit utilized in such application as step down regulating transformers or autotransformers. This edition includes the following significant technical changes with respect to the previous edition:
- addition of winding connections with phase displacement (30°);
- addition of transformers with more than one active part in the same tank;
- change of reference power definition;
- addition of regulating transformer feeding converter transformer;
- addition of considerations about current sharing and hot spot temperature in high current windings for various winding arrangements;
- addition of transductors used for d.c. voltage regulation together with diode rectifiers. The contents of the corrigendum of January 2012 have been included in this copy.