IEC 61181:2007

IEC 61181 ®
Edition 2.1 2012-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Mineral oil-filled electrical equipment – Application of dissolved gas analysis
(DGA) to factory tests on electrical equipment
Matériels électriques imprégnés d’huile minérale – Application de l’analyse des
gaz dissous (AGD) lors d’essais en usine de matériels électriques
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IEC 61181 ®
Edition 2.1 2012-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Mineral oil-filled electrical equipment – Application of dissolved gas analysis

(DGA) to factory tests on electrical equipment

Matériels électriques imprégnés d’huile minérale – Application de l’analyse des

gaz dissous (AGD) lors d’essais en usine de matériels électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040 ISBN 978-2-8322-0051-3

– 2 – 61181  IEC:2007+A1:2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5

1 Scope . 6
2 Normative references . 6
3 General caution, health, safety and environmental protection . 6
4 Oil sampling . 7
4.1 General . 7
4.2 Sample containers . 7
4.3 Sampling location . 7
4.4 Sampling frequency . 7
4.5 Sample labelling . 8
4.6 Sample storage . 8
4.7 Disposal of waste oil . 8
5 Factors affecting gassing rate during thermal tests . 8
6 Dissolved gas extraction and analysis . 9
7 Report . 10

Annex A (informative) Gas formation rates during thermal tests on power transformers . 11
Annex B (informative) Gas formation rates during chopped-lightning impulse tests on
instrument transformers [6] . 13

Bibliography . 14

Table 1 – Required detection limits for factory tests . 9
Table A.1 – Ranges of 90 % typical rates of gas formation in modern, mineral oil- filled
power transformers during thermal tests, in µl/l/h . 11
Table A.2 – Survey of cases followed by problems in core-type, mineral oil- filled
power transformers, for various rates of gas formation observed during the thermal
tests, (values in µl/l/h). 12
Table B.1 – 90 % typical gas concentration increases observed between the beginning
and the end of chopped lightning-impulse tests on instrument transformers . 13

61181  IEC:2007+A1:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINERAL OIL-FILLED ELECTRICAL EQUIPMENT –
APPLICATION OF DISSOLVED GAS ANALYSIS (DGA)
TO FACTORY TESTS ON ELECTRICAL EQUIPMENT
FOREWORD
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This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 61181 edition 2.1 contains the second edition (2007) [documents 10/675/FDIS and 10/688/
RVD] and its amendment 1 (2012) [documents 10/881/FDIS and 10/886/RVD].
A vertical line in the margin shows where the base publication has been modified by
amendment 1. Additions and deletions are displayed in red, with deletions being struck
through.
– 4 – 61181  IEC:2007+A1:2012
International Standard IEC 61181 has been prepared by IEC technical committee 10: Fluids
for electrotechnical applications.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the specific procedures used during factory tests (sampling location, sampling frequency,
gas extraction and chromatographic analysis in the laboratory) are described in more
detail;
b) information is provided in Annex A concerning the residual gas contents recommended
before thermal tests on power transformers, typical gas values observed during the tests
and cases where gas formation during the tests was followed by problems in the
transformers;
c) typical values observed during chopped lightning-impulse tests on instrument transformers
are indicated in Annex B.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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of its contents. Users should therefore print this publication using a colour printer.

61181  IEC:2007+A1:2012 – 5 –
INTRODUCTION
IEC technical committee 10, responsible for IEC 61181, has prepared guidelines for
per
...