EN IEC 60599:2022

Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis

This document describes how the concentrations of dissolved gases or free gases can be interpreted to diagnose the condition of oil-filled electrical equipment in service and suggest future action. This document is applicable to electrical equipment filled with mineral insulating oil and insulated with cellulosic paper or pressboard-based solid insulation. Information about specific types of equipment such as transformers (power, instrument, industrial, railways, distribution), reactors, bushings, switchgear and oil-filled cables is given only as an indication in the application notes. This document can be applied, but only with caution, to other liquid-solid insulating systems. In any case, the indications obtained are given only as guidance with resulting action undertaken only with proper engineering judgment.

In Betrieb befindliche, mit Mineralöl befüllte elektrische Geräte - Leitfaden zur Interpretation der Analyse gelöster und freier Gase

Matériels électriques remplis d'huile minérale en service - Recommandations relatives à l'interprétation de l'analyse des gaz dissous et des gaz libres

IEC 60599:2022 décrit la façon dont les concentrations de gaz dissous ou de gaz libres peuvent être interprétées pour diagnostiquer l'état des matériels électriques remplis d'huile en service et pour proposer une intervention ultérieure. Le présent document s'applique aux matériels électriques remplis d'huile minérale isolante et isolés par des isolants solides constitués de papier ou de carton cellulosiques. Des informations relatives aux types spécifiques de matériels tels que les transformateurs (de puissance, de mesure, industriels, ferroviaires, de distribution), les réactances, les traversées, les appareillages de connexion et les câbles à huile fluide sont données, à titre informatif seulement, dans les notes d'application. Le présent document peut être appliqué, mais uniquement avec prudence, à d'autres systèmes d'isolation liquide-solide. Dans tous les cas, les indications obtenues sont données uniquement à titre de recommandations et toute action qui en résulte n'est à entreprendre qu'après une appréciation technique convenable.

Električna oprema, polnjena z mineralnim oljem, v delovanju - Vodilo za tolmačenje rezultatov analize raztopljenih in prostih plinov

Ta dokument opisuje, kako je mogoče na podlagi koncentracije raztopljenih in prostih plinov diagnosticirati stanje električne opreme, napolnjene z oljem, v delovanju, ter podati priporočila za nadaljnje ukrepe. Ta dokument se uporablja za električno opremo, napolnjeno z mineralnim izolacijskim oljem in izolirano s celuloznim papirjem ali trdno izolacijo iz prešpanskih plošč. Informacije o določenih vrstah opreme, kot so transformatorji (močnostni, instrumentni, industrijski, železniški, distribucijski), reaktorji, skoznjiki, stikalne naprave in kabli, napolnjeni z oljem, so podane le kot navedbe v opombah za uporabo. Ta dokument je po preudarku mogoče uporabiti tudi za druge izolacijske sisteme iz tekočih/trdnih materialov. V vsakem primeru so pridobljeni podatki podani samo kot napotki, morebitni ukrepi pa naj se izvajajo samo na podlagi ustrezne inženirske presoje.

General Information

• Status: Published
• Publication Date: 30-Jun-2022
• ICS: 17.220.99 - Other standards related to electricity and magnetism
• ICS: 29.040.10 - Insulating oils
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: CLC/SR 10 - Fluids for electrotechnical applications
• Drafting Committee: IEC/TC 10 - IEC_TC_10
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 01-Jul-2022
• Completion Date: 01-Jul-2022
• Ref Project: SIST EN IEC 60599:2022 - Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis

Relations

• Replaces: EN 60599:2016 - Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis
• Effective Date: 18-Aug-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2022
Nadomešča:
SIST EN 60599:2016
Električna oprema, polnjena z mineralnim oljem, v delovanju - Vodilo za
tolmačenje rezultatov analize raztopljenih in prostih plinov
Mineral oil-filled electrical equipment in service - Guidance on the interpretation of
dissolved and free gases analysis
In Betrieb befindliche, mit Mineralöl befüllte elektrische Geräte - Leitfaden zur
Interpretation der Analyse gelöster und freier Gase
Matériels électriques remplis d'huile minérale en service - Lignes directrices pour
l'interprétation de l'analyse des gaz dissous et des gaz libres
Ta slovenski standard je istoveten z: EN IEC 60599:2022
ICS:
29.040.10 Izolacijska olja Insulating oils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60599

NORME EUROPÉENNE
EUROPÄISCHE NORM July 2022
ICS 17.220.99; 29.040.10; 29.180 Supersedes EN 60599:2016
English Version
Mineral oil-filled electrical equipment in service - Guidance on
the interpretation of dissolved and free gases analysis
(IEC 60599:2022)
Matériels électriques remplis d'huile minérale en service - In Betrieb befindliche, mit Mineralöl befüllte elektrische
Recommandations relatives à l'interprétation de l'analyse Geräte - Leitfaden zur Interpretation der Analyse gelöster
des gaz dissous et des gaz libres und freier Gase
(IEC 60599:2022) (IEC 60599:2022)
This European Standard was approved by CENELEC on 2022-06-29. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60599:2022 E
European foreword
The text of document 10/1164/FDIS, future edition 4 of IEC 60599, prepared by IEC/TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60599:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-03-29
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-06-29
document have to be withdrawn
This document supersedes EN 60599:2016 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60599:2022 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60475 - Method of sampling insulating liquids - -
IEC 60567 2011 Oil-filled electrical equipment - Sampling of EN 60567 2011
gases and analysis of free and dissolved
gases - Guidance
IEC 61198 - Mineral insulating oils - Methods for the EN 61198 -
determination of 2-furfural and related
compounds
IEC 60599 ®
Edition 4.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mineral oil-filled electrical equipment in service – Guidance on the interpretation
of dissolved and free gases analysis
Matériels électriques remplis d'huile minérale en service – Recommandations
relatives à l'interprétation de l'analyse des gaz dissous et des gaz libres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99; 29.040.10; 29.180 ISBN 978-2-8322-3696-3
– 2 – IEC 60599:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 10
3.2.1 Chemical names and formulae . 10
3.2.2 General abbreviated terms . 10
4 Mechanisms of gas formation . 11
4.1 Decomposition of oil . 11
4.2 Decomposition of cellulosic insulation . 12
4.3 Stray gassing of oil . 12
4.4 Other sources of gas . 12
5 Identification of faults . 12
5.1 General . 12
5.2 Dissolved gas compositions . 13
5.3 Types of faults . 13
5.4 Basic gas ratios . 13
5.5 CO /CO ratio . 15
5.6 O /N ratio . 15
2 2
5.7 C H /H ratio . 16
2 2 2
5.8 C hydrocarbons . 16
5.9 Evolution of faults . 16
5.10 Graphical representations . 16
6 Conditions for calculating ratios . 17
6.1 Examination of DGA values . 17
6.2 Uncertainty on gas ratios . 17
7 Application to free gases in gas relays . 17
8 Gas concentration levels in service . 19
8.1 Probability of failure in service . 19
8.1.1 General . 19
8.1.2 Calculation methods . 20
8.2 Typical concentration values . 20
8.2.1 General . 20
8.2.2 Calculation methods . 20
8.2.3 Choice of normality percentages . 20
8.2.4 Alarm concentration values . 20
8.3 Rates of gas increase . 21
9 Recommended method of DGA interpretation . 21
10 Report of results . 22
Annex A (informative) Equipment application notes . 24
A.1 General warning . 24
A.2 Power transformers . 24

IEC 60599:2022 © IEC 2022 – 3 –
A.2.1 Specific subtypes. 24
A.2.2 Typical faults . 24
A.2.3 Identification of faults by DGA . 25
A.2.4 Typical concentration values . 25
A.2.5 Typical rates of gas increase . 26
A.2.6 Specific information to be added to the DGA report . 27
A.3 Industrial and special transformers . 27
A.3.1 Specific subtypes. 27
A.3.2 Typical faults . 27
A.3.3 Identification of faults by DGA . 28
A.3.4 Typical concentration values . 28
A.4 Instrument transformers . 29
A.4.1 Specific subtypes. 29
A.4.2 Typical faults . 29
A.4.3 Identification of faults by DGA . 29
A.4.4 Typical concentration values . 30
A.5 Oil-impregnated paper bushings . 30
A.5.1 Specific subtypes. 30
A.5.2 Typical faults . 30
A.5.3 Identification of faults by DGA . 31
A.5.4 Typical concentration values . 31
A.6 Oil-filled cables . 32
A.6.1 Typical faults .
...