IEC 60076-7:2018

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

IEC 60076-7:2018 is now available as IEC 60076-7:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60076-7:2018 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.

General Information

• Status: Published
• Publication Date: 11-Jan-2018
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 14 - Power transformers
• Drafting Committee: MT 60076-7 - TC 14/MT 60076-7
• Current Stage: PPUB - Publication issued
• Start Date: 29-Dec-2017
• Completion Date: 12-Jan-2018

Standards Content (Sample)

IEC 60076-7
®


Edition 2.0 2018-01
INTERNATIONAL
STANDARD

colour
inside


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

IEC 60076-7:2018-01(en)

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IEC 60076-7

®


Edition 2.0 2018-01





INTERNATIONAL



STANDARD








colour

inside










Power transformers –

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



























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 29.180 ISBN 978-2-8322-5082-2




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– 2 – IEC 60076-7:2018 © IEC 2018
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 Symbols and abbreviations . 11
5 Effect of loading beyond nameplate rating . 13
5.1 General . 13
5.2 General consequences . 13
5.3 Effects and hazards of short-time emergency loading . 14
5.4 Effects of long-time emergency loading .
...