scope:

1.1 Scope This International Standard deals with the specification, design and testing of power transformers and reactors which are intended for integration within semiconductor convertor plants; it is not applicable to transformers designed for industrial or public distribution of a.c. power in general. The scope of this standard is limited to application of power convertors of any power rating typical of application such as: Thyristor rectifiers for electrolysis, Diode rectifiers for electrolysis, Thyristor rectifiers for large drives, Thyristor rectifiers for scrap melting furnaces, 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 convertor plant (IEC 60146, or other publications dedicated to particular fields of application) may contain requirements of guarantees and tests (such as insulation, power loss) for the whole plant, including the convertor 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 convertor transformer itself as a separate component before being assembled with the remainder of the convertor plant. The guarantees, service and type tests defined in this standard apply equally to transformers supplied as part of an overall convertor package, or to those transformers ordered separately but for use with convertor equipment. Any supplementary guarantee or special verification has to be specifically agreed in the transformer contract. The convertor 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 are required to comply with IEC 60076 for oil-immersed transformers, and with IEC 60076-11 for dry-type transformers. NOTES 1 For some convertor applications, it is possible to use common distribution transformers of standard design. The use of such standard transformers in the special convertor applications may require a certain derating. This matter is not specifically covered in this standard, which deals with the requirements to be placed on specially designed units. It is possible to estimate this derating from the formulae given in 5.1, and also from clause 9 of IEC 60076-8. 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 Ä 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.