EN 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
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

IEC 61378-1:2011(E) 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.