Table of Contents

Abstract

Provides a guide for the application, calculations and measurements of conventional design and loaded three-phase and single-phase power transformers (including auto-transformers). Certain categories of small and special transformers are not covered. Recommendations are not mandatory and do not in themselves constitute specification requirements.
RECONFIRMATION NOTICE
Technical Committee EL-008 has reviewed the content of this publication and in accordance with Standards Australia procedures for reconfirmation, it has been determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the original date of publication. Users are advised to ensure that they are using the latest versions of such documents as appropriate, unless advised otherwise in this Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for reconfirmation on 25 September 2015.
The following are represented on Technical Committee EL-008:
Australian Chamber of Commerce and Industry
Australian Industry Group
Australian Institute of Petroleum
Electricity Engineers Association (New Zealand)
Energy Efficiency and Conservation Authority of New Zealand
Energy Networks Association
Engineers Australia
Industry Training Body
Rail Industry Safety and Standards Board

Scope

This Standard applies to power transformers complying with the series of publications IEC 60076.
It is intended to provide information to users about:
– certain fundamental service characteristics of different transformer connections and magnetic circuit designs, with particular reference to zero-sequence phenomena;
– system fault currents in transformers with YNynd and similar connections;
– parallel operation of transformers, calculation of voltage drop or rise under load, and calculation of load loss for three-winding load combinations;
– selection of rated quantities and tapping quantities at the time of purchase, based on prospective loading cases;
– application of transformers of conventional design to convertor loading;
– measuring technique and accuracy in loss measurement.
Part of the information is of a general nature and applicable to all sizes of power transformers. Several chapters, however, deal with aspects and problems which are of the interest only for the specification and utilization of large high-voltage units.
The recommendations are not mandatory and do not in themselves constitute specification requirements.
Information concerning loadability of power transformers is given in IEC 60354, for oil-immersed transformers, and IEC 60905, for dry-type transformers.
Guidance for impulse testing of power transformers is given in IEC 60722.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmed 27/05/2016. This standard has been reconfirmed in Australia in 2016 and remains current in New Zealand. Reconfirmation Notice 27/05/2016
Pages
ISBN
Committee	EL-008
Supersedes	DR 00013 CP AS 2421-1981