IEC 60567:2023

Oil-filled electrical equipment - Sampling of free gases and analysis of free and dissolved gases in mineral oils and other insulating liquids - Guidance

IEC 60567:2023 deals with the techniques for sampling free gases from gas-collecting relays from power transformers. Three methods of sampling free gases are described. The techniques for sampling oil from oil-filled equipment such as power and instrument transformers, reactors, bushings, oil-filled cables and oil-filled tank-type capacitors are no longer covered by this document, but are instead described in IEC 60475:2022, 4.2. Before analysing the gases dissolved in oil, they are first extracted from the oil. Three basic methods are described, one using extraction by vacuum (Toepler and partial degassing), another by displacement of the dissolved gases by bubbling the carrier gas through the oil sample (stripping) and the last one by partition of gases between the oil sample and a small volume of the carrier gas (headspace). The gases are analysed quantitatively after extraction by gas chromatography; a method of analysis is described. Free gases from gas-collecting relays are analysed without preliminary treatment.

Matériels électriques immergés - Échantillonnage de gaz libres et analyse des gaz libres et dissous dans les huiles minérales et d'autres liquides isolants - Recommandations

L'IEC 60567:2023 traite des techniques d'échantillonnage de gaz libres au niveau des relais de protection des transformateurs de puissance. Trois méthodes d'échantillonnage des gaz libres sont décrites. Les techniques d'échantillonnage de l'huile dans les matériels immergés dans l'huile, tels que les transformateurs de puissance et de mesure, les bobines d'inductances, les traversées de transformateurs, les câbles à huile fluide et les condensateurs de puissance ne sont plus couverts par le présent document, mais se trouvent dorénavant dans l'IEC 60475:2022, 4.2. Avant d'analyser les gaz dissous dans l'huile, ils sont en premier lieu extraits de l'huile. Trois méthodes de base sont décrites, l'une utilisant l'extraction sous vide (Toepler et dégazage partiel), une autre par déplacement des gaz dissous par barbotage d'un gaz vecteur dans l'échantillon d'huile (entraînement) et la dernière par partition des gaz entre l'échantillon d'huile et un faible volume du gaz vecteur (espace de tête). Après extraction, l'analyse quantitative des gaz s'effectue par chromatographie en phase gazeuse; une méthode d'analyse est décrite. Les gaz libres prélevés au niveau des relais de protection sont analysés sans traitement préalable.

General Information

• Status: Published
• Publication Date: 07-Dec-2023
• ICS: 29.040.10 - Insulating oils
• Technical Committee: TC 10 - Fluids for electrotechnical applications
• Drafting Committee: MT 25 - TC 10/MT 25
• Current Stage: PPUB - Publication issued
• Start Date: 12-Jan-2024
• Completion Date: 08-Dec-2023

Relations

• Revises: IEC 60567:2011 - Oil-filled electrical equipment - Sampling of gases and analysis of free and dissolved gases - Guidance
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60567 ®
Edition 5.0 2023-12
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Oil-filled electrical equipment – Sampling of free gases and analysis of free and
dissolved gases in mineral oils and other insulating liquids – Guidance
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 60567 ®
Edition 5.0 2023-12
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Oil-filled electrical equipment – Sampling of free gases and analysis of free and
dissolved gases in mineral oils and other insulating liquids – Guidance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.040.10 ISBN 978-2-8322-7996-0
– 2 – IEC 60567:2023 CMV © IEC 2023
CONTENTS
FOREWORD .5
INTRODUCTION .7
1 Scope .9
2 Normative references .9
3 Terms, definitions, symbols and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Symbols and abbreviated terms . 10
3.2.1 Symbols . 10
3.2.2 Abbreviated terms . 10
4 Sampling of gases from gas-collecting (Buchholz) relays . 11
4.1 General remarks . 11
4.2 Sampling of free gases by syringe . 11
4.2.1 Sampling equipment . 11
4.2.2 Sampling procedure . 12
4.3 Sampling of free gases by displacement of oil . 13
4.4 Sampling of free gases by vacuum . 13
4.5 Sampling of oil from oil filled equipment . 15
5 Labelling of gas samples . 15
6 Sampling, labelling and transferring of oil from oil-filled equipment . 16
6.1 Sampling and labelling of oil . 16
6.2 Transfer of oil for DGA analysis . 16
6.2.1 General . 16
6.2.2 Transfer from oil syringes . 16
6.2.3 Transfer from ampoules . 16
6.2.4 Transfer from flexible metal bottles . 17
6.2.5 Transfer from glass and rigid metal bottles . 17
7 Preparation of gas-in-oil standards . 17
7.1 General remarks . 17
7.2 First method: preparation of a large volume of gas-in-oil standard . 17
7.2.1 Equipment . 17
7.2.2 Procedure . 18
7.2.3 Calculation . 20
7.3 Second method: preparation of gas-in-oil standards in a syringe or a vial . 20
7.3.1 General . 20
7.3.2 Equipment . 22
7.3.3 Procedure . 22
8 Extraction of gases from oil . 22
8.1 General remarks . 22
8.2 Multi-cycle vacuum extraction using Toepler pump apparatus . 23
8.2.1 General . 23
8.2.2 Toepler pump extraction apparatus . 23
8.2.3 Extraction procedure . 26
8.3 Vacuum extraction by partial degassing method . 27
8.3.1 General remarks . 27
8.3.2 Partial degassing apparatus . 27
8.3.3 Extraction procedure . 28

8.4 Stripping extraction method . 28
8.4.1 General . 28
8.4.2 Stripping apparatus . 28
8.4.3 Outline of procedure . 31
8.5 Headspace method . 32
8.5.1 Principle of the method . 32
8.5.2 Headspace extraction apparatus . 33
8.5.3 Headspace extraction procedure . 37
8.5.4 Calibration of the headspace extractor . 41
9 Gas analysis by gas-solid chromatography . 43
9.1 General remarks . 43
9.2 Outline of suitable methods using Table 4 . 45
9.3 Apparatus. 45
9.3.1 Gas chromatograph . 45
9.3.2 Columns . 47
9.3.3 Carrier gas . 47
9.3.4 Detectors . 47
9.3.5 Methanator . 47
9.3.6 Cold trap . 47
9.3.7 Integrator and recorder . 47
9.4 Preparation of apparatus. 48
9.5 Analysis . 48
9.6 Calibration of the chromatograph . 48
9.7 Calculations . 49
10 Quality control . 49
10.1 Verification of the entire analytical system . 49
10.2 Limits of detection and quantification . 50
10.3 Repeatability, reproducibility and accuracy . 51
10.3.1 General remark . 51
10.3.2 Repeatability . 51
10.3.3 Reproducibility . 51
10.3.4 Accuracy . 52
11 Report of results . 52
Annex A (informative) Correction for incomplete gas extraction in partial degassing
method by calculation. 54
Annex B (informative) Mercury-free and shake test versions of the standard extraction
methods.
Annex B (informative) Alternative gas extraction methods . 58
B.1 Mercury-free versions of the vacuum extraction methods . 58
B.1.1 Mercury-free version of the Toepler method . 58
B.1.2 Mercury-free version of the partial degassing method . 58
B.2 Syringe versions of the headspace method . 58
B.2.1 Shake test method . 58
B.2.2 Mechanical oscillation method . 60
Annex C (informative) Preparation of air-saturated standards . 61
Annex D (informative) Correction for gas bubbles in syringes and air gap in rigid
bottles . 62
Annex E (informative) Procedure for comparing gas monitor readings to laboratory
results . 63

– 4 – IEC 60567:2023 CMV © IEC 2023
Annex F (normative) Insulating liquids based on synthetic and natural esters and
silicones . 64
Bibliography . 66
List of comments .
...

IEC 60567 ®
Edition 5.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Oil-filled electrical equipment – Sampling of free gases and analysis of free and
dissolved gases in mineral oils and other insulating liquids – Guidance

Matériels électriques immergés – Échantillonnage de gaz libres et analyse des
gaz libres et dissous dans les huiles minérales et d'autres liquides isolants –
Recommandations
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
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and withdrawn publications.
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Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
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IEC 60567 ®
Edition 5.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Oil-filled electrical equipment – Sampling of free gases and analysis of free and

dissolved gases in mineral oils and other insulating liquids – Guidance

Matériels électriques immergés – Échantillonnage de gaz libres et analyse des

gaz libres et dissous dans les huiles minérales et d'autres liquides isolants –

Recommandations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10  ISBN 978-2-8322-7960-1

– 2 – IEC 60567:2023 © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, symbols and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Symbols and abbreviated terms . 10
3.2.1 Symbols . 10
3.2.2 Abbreviated terms . 10
4 Sampling of gases from gas-collecting relays . 11
4.1 General remarks . 11
4.2 Sampling of free gases by syringe . 11
4.2.1 Sampling equipment . 11
4.2.2 Sampling procedure . 12
4.3 Sampling of free gases by displacement of oil . 13
4.4 Sampling of free gases by vacuum . 13
4.5 Sampling of oil from oil filled equipment . 15
5 Labelling of gas samples . 15
6 Sampling, labelling and transferring of oil from oil-filled equipment . 15
6.1 Sampling and labelling of oil . 15
6.2 Transfer of oil for DGA analysis . 15
6.2.1 General . 15
6.2.2 Transfer from oil syringes . 15
6.2.3 Transfer from ampoules . 16
6.2.4 Transfer from flexible metal bottles . 16
6.2.5 Transfer from glass and rigid metal bottles . 16
7 Preparation of gas-in-oil standards . 16
7.1 General remarks . 16
7.2 First method: preparation of a large volume of gas-in-oil standard . 16
7.2.1 Equipment . 16
7.2.2 Procedure . 17
7.2.3 Calculation . 19
7.3 Second method: preparation of gas-in-oil standards in a syringe or a vial . 19
7.3.1 General . 19
7.3.2 Equipment . 21
7.3.3 Procedure . 21
8 Extraction of gases from oil . 21
8.1 General remarks . 21
8.2 Multi-cycle vacuum extraction using Toepler pump apparatus . 22
8.2.1 General . 22
8.2.2 Toepler pump extraction apparatus . 22
8.2.3 Extraction procedure . 25
8.3 Vacuum extraction by partial degassing method . 26
8.3.1 General remarks . 26
8.3.2 Partial degassing apparatus . 26
8.3.3 Extraction procedure . 27

8.4 Stripping extraction method . 27
8.4.1 General . 27
8.4.2 Stripping apparatus . 27
8.4.3 Outline of procedure . 30
8.5 Headspace method . 31
8.5.1 Principle of the method . 31
8.5.2 Headspace extraction apparatus . 32
8.5.3 Headspace extraction procedure . 36
8.5.4 Calibration of the headspace extractor . 40
9 Gas analysis by gas-solid chromatography . 42
9.1 General remarks . 42
9.2 Outline of suitable methods using Table 4 . 44
9.3 Apparatus . 44
9.3.1 Gas chromatograph . 44
9.3.2 Columns . 46
9.3.3 Carrier gas . 46
9.3.4 Detectors . 46
9.3.5 Methanator . 46
9.3.6 Cold trap . 46
9.3.7 Integrator and recorder . 46
9.4 Preparation of apparatus . 47
9.5 Analysis . 47
9.6 Calibration of the chromatograph . 47
9.7 Calculations . 48
10 Quality control . 48
10.1 Verification of the entire analytical system .
...