This Part of IEC 61378 deals with the specification, design and testing of power transformers
and reactors which are intended for integration within semiconductor converter plants; it is not
applicable to transformers designed for industrial or public distribution of a.c. power in general.
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. The valve winding highest voltage for equipment is limited to 36 kV.
This standard is not applicable to transformers for HVDC power transmission. These are highvoltage
transformers, and they are subjected to d.c. voltage tests.
The standards for the complete converter plant (IEC 60146 series, or other publications
dedicated to particular fields of application) may contain requirements of guarantees and tests
(such as insulation and power loss) for the whole plant, including the converter transformer and
possibly auxiliary transformers and reactor equipment. This does not relieve the application of
the requirements of this standard concerning the guarantees and tests applicable to the
converter transformer itself as a separate component before being assembled with the
remainder of the converter plant.
The guarantees, service and type tests defined in this standard apply equally to transformers
supplied as part of an overall converter package, or to those transformers ordered separately
but for use with converter equipment. Any supplementary guarantee or special verification has
to be specifically agreed in the transformer contract.
The converter transformers covered by this standard may be of the oil-immersed or dry-type
design. Unless specific exceptions are stated in this standard, the transformers comply with
IEC 60076 series for oil-immersed transformers, and with IEC 60076-11 for dry-type
transformers.
This standard deals with transformers with one or more active parts installed in the same tank
like regulating (auto)transformer and one or two rectifier transformers. It also covers
transformers with transductors and/or one or more interphase transformers.
For any combination not listed above an agreement between the purchaser and manufacturer
is necessary regarding the determination and the measurement of the total losses.
This standard deals with transformers star Y and delta D and any other phase shifting
connections (like zig-zag, extended delta, polygon etc.). Phase shifting windings can be placed
on either the regulating or rectifier transformer.