IEC 60076-7:2017 PRV 
Pre release version

Power transformers - Part 7: Loading guide for mineral-oil-immersed power transformers

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Abstract

This Final Draft International Standard is an up to 6 weeks' pre-release of the official publication. It is available for sale during its voting period: 2017-09-29 to 2017-11-10. By purchasing this FDIS now, you will automatically receive, in addition, the final publication.

IEC 60076-7:2017 is applicable to mineral-oil-immersed transformers. It describes the effect of operation under various ambient temperatures and load conditions on transformer life.
This document provides guidance for the specification and loading of power transformers from the point of view of operating temperatures and thermal ageing. It provides recommendations for loading above the nameplate rating and guidance for the planner to choose appropriate rated quantities and loading conditions for new installations. This edition includes the following significant technical changes with respect to the previous edition:
a) title has been updated from "oil-immersed power transformers" to "mineral-oil-immersed transformers";
b) insulation life is updated by considering latest research findings;
c) temperature limits have been reviewed and maximum core temperature is recommended;
d) number of fibre optic sensors is recommended for temperature rise test;
e) Q, S and H factors are considered;
f) thermal models are revised and rewritten in generally applicable mathematical form;
g) geomagnetic induced currents are briefly discussed and corresponding temperature limits are suggested;
h) extensive literature review has been performed and a number of references added to bibliography.

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Additional information

Publication typeInternational Standard
Publication date2017-09-29
Edition2.0
Available language(s)English
TC/SCTC 14 - Power transformersrss
ICS29.180 - Transformers. Reactors
Stability date  2023
Pages89
File size2279 KB

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