EN IEC 60422:2024
(Main)Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
IEC 60422:2024 provides monitoring guidance and procedures that are required for the use and maintenance of mineral insulating oils and other hydrocarbon-based liquids in transformers and other electrical equipment, including strategic spares and tanks for holding spare parts and components. This document is applicable to mineral insulating oils, originally supplied conforming to IEC 60296, in transformers, switchgear and other electrical apparatus where oil sampling is reasonably practicable, and where the normal operating conditions specified in the equipment specifications apply. This document is also intended to assist the power equipment operator to evaluate the condition of the oil and maintain it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice. The document includes recommendations on tests and evaluation procedures, and outlines methods for reconditioning and reclaiming oil, and the decontamination of oil contaminated with PCBs. NOTE The condition monitoring of electrical equipment, for example by analysis of dissolved gases, furanic compounds or other means, is outside the scope of this document.
Isolieröle auf Mineralölbasis in elektrischen Betriebsmitteln - Leitlinie zur Überwachung und Wartung
Huiles minérales isolantes dans les matériels électriques - Lignes directrices pour la maintenance et la surveillance
L'IEC 60422:2024 fournit des recommandations et des procédures de surveillance nécessaires pour l'utilisation et la maintenance des huiles minérales isolantes et d'autres liquides à base d'hydrocarbures dans les transformateurs et autres matériels électriques, y compris les pièces de rechange stratégiques et les cuves qui contiennent les pièces et composants de rechange. Le présent document s'applique aux huiles minérales isolantes qui satisfont à l'origine aux exigences de l'IEC 60296 et sont présentes dans les transformateurs, appareillages de connexion et autres appareils électriques pour lesquels le prélèvement d'échantillons d'huile est raisonnablement possible et auxquels les conditions normales de fonctionnement prévues dans les spécifications du matériel s'appliquent. Le présent document est également destiné à aider l'opérateur du matériel électrique à évaluer l'état de l'huile et à la maintenir en état d'être utilisée. Il fournit également une base commune à l'élaboration de codes de pratique locaux plus complets et plus spécifiques. Le document inclut des recommandations sur les essais et les procédures d'évaluation et indique des procédés de retraitement et de régénération de l'huile ainsi que de décontamination de l'huile contaminée par les PCB. NOTE La surveillance de l'état des matériels électriques, par exemple par l'analyse des gaz dissous et des dérivés furaniques, ou par tout autre moyen, ne fait pas partie du domaine d'application du présent document.
Mineralna izolacijska olja v električni opremi - Napotki za nadzorovanje in vzdrževanje
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60422:2023
01-junij-2023
Mineralna izolacijska olja v električni opremi - Napotki za nadzorovanje in
vzdrževanje
Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
Isolieröle auf Mineralölbasis in elektrischen Betriebsmitteln - Leitlinie zur Überwachung
und Wartung
Huiles minérales isolantes dans les matériels électriques - Lignes directrices pour la
maintenance et la surveillance
Ta slovenski standard je istoveten z: prEN IEC 60422:2023
ICS:
29.040.10 Izolacijska olja Insulating oils
oSIST prEN IEC 60422:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN IEC 60422:2023
oSIST prEN IEC 60422:2023
10/1194/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60422 ED5
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-04-07 2023-06-30
SUPERSEDES DOCUMENTS:
10/1165/CD, 10/1183A/CC
IEC TC 10 : FLUIDS FOR ELECTROTECHNICAL APPLICATIONS
SECRETARIAT: SECRETARY:
Italy Mr Massimo Pompili
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 14, SC 17A, TC 20, SC 36A, TC 38, TC 99, TC 112
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of
• any relevant patent rights of which they are aware and to provide supporting documentation,
• any relevant “in some countries” clauses to be included should this proposal proceed. Recipients are reminded that the
enquiry stage is the final stage for submitting "in some countries" clauses. See AC/22/2007.
TITLE:
Mineral insulating oils in electrical equipment – Supervision and maintenance guidance
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
oSIST prEN IEC 60422:2023
– 2 – IEC CDV 60422 IEC 2023
CONTENTS
Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 Properties and deterioration/degradation of oil . 12
5 Categories of equipment . 12
6 Sampling of oil from equipment . 13
7 In-service oil diagnostic tests. 14
General . 14
Colour . 15
Appearance . 15
Breakdown voltage (BDV). 15
Water content . 16
Water content in the oil/paper-system . 16
Influence of water on the solid/liquid dielectric system . 16
Water in oil . 17
Water in the solid insulation . 18
Interpretation of results. 19
Acidity . 20
Dielectric dissipation factor (DDF) and resistivity . 21
Inhibitor content . 22
Oxidation stability . 22
Monitoring of uninhibited and inhibited oils . 22
Sediment . 22
Sludge . 23
Interfacial tension (IFT) . 23
Particles . 23
Flash point . 24
Compatibility . 24
Compatibility between different insulating mineral oils (miscibility) . 24
Pour point . 25
Density . 25
Viscosity. 26
Polychlorinated biphenyls (PCBs) . 26
Corrosive sulphur in mineral insulating oil . 26
Corrosive sulphur . 27
Potentially corrosive sulphur . 27
Dibenzyl disulphide (DBDS) . 27
Metal Passivator . 27
Air Release and Foaming . 28
8 Evaluation of mineral insulating oil in new equipment . 28
9 Evaluation of oil in service . 29
General . 29
Frequency of examination of oils in service . 30
Testing procedures . 31
oSIST prEN IEC 60422:2023
IEC CDV 60422 IEC 2023 – 3 –
General . 31
Field tests. 31
Laboratory tests . 32
Classification of the condition of oils in service . 32
Transformers . 32
Tap-changers . 32
Instrument and protection transformers . 33
Circuit breakers and switchgear . 33
Oil filled and OIP bushings . 33
Corrective action . 33
10 Interpretation of results . 35
11 Handling and storage . 46
12 Replacement of oil in electrical equipment . 47
Replacement of oil in transformers with an U below 72,5 kV and in
m
switchgear and associated equipment . 47
Replacement of oil in transformers with an U of 72,5 kV and above . 47
m
Replacement of oil in electrical equipment contaminated with PCBs . 48
13 Addition of metal passivators to in-service oil . 48
14 Treatment . 48
WARNING . 48
Classification of Treatment Processes . 49
Off-Line (de-energized) vs On-Line (energized) treatment . 49
Batch vs Continuous Mode Treatment . 50
Reconditioning (degassing, drying and filtration) . 50
General . 50
Reconditioning equipment . 51
Application to electrical equipment . 53
Reclaiming . 54
General . 54
Reclaiming by percolation with single use sorbents . 54
Reclaiming process using reactivating sorbents . 55
Renewal of additives . 56
Removal of PCBs using dehalogenation and related processes . 57
General . 57
Dehalogenation processes using sodium and lithium derivatives . 57
Dehalogenation processes using polyethylene glycol and potassium
hydroxide (KPEG) . 57
Dehalogenation in continuous mode by closed circuit process . 57
Corrosive sulphur removal using KPEG . 57
Criteria for oil reclamation and treatments . 58
Annex A (normative) Criteria for reclamation and treatments . 59
A.1 Introduction . 59
A.2 Key parameters to measure before and after reclamation . 59
A.3 Addition of inhibitor after reclamation . 60
A.4 Time and location of sampling . 60
Annex B (informative) General guideline for moisture %RS for continuous online
monitoring . 62
oSIST prEN IEC 60422:2023
– 4 – IEC CDV 60422 IEC 2023
Annex C (informative) Normalizing water in oil for comparison and trending (Historical
practice) . 63
C.1 General . 63
C.2 Sampling temperature at or above 35 °C . 63
Annex D (informative) Material Compatibility . 65
Annex E (informative) Test method for determination of sediment and sludge . 67
E.1 Sediment determination . 67
E.2 Sludge determination . 67
Annex F (informative) Contamination of oils with silicone . 68
Annex G Bibliography . 69
LIST OF FIGURES
Figure 1 – Water solubility curves for unused mineral oil as adapted from literature [3]
(According to Equation (3)) . 18
Figure 2 – Hysteresis loops of
...
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