Fluids for electrotechnical applications – Mineral insulating oils for electrical equipment

IEC 60296:2020 provides specifications and test methods for unused and recycled mineral insulating oils. It applies to mineral oil delivered according to the contractual agreement, intended for use in transformers, switchgear and similar electrical equipment in which oil is required for insulation and heat transfer. Both unused oil and recycled oil under the scope of this document have not been used in, nor been in contact with electrical equipment or other equipment not required for manufacture, storage or transport.
Unused oils are obtained by refining, modifying and/or blending of petroleum products and other hydrocarbons from virgin feedstock.
Recycled oils are produced from oils previously used as mineral insulating oils in electrical equipment that have been subjected to re-refining or reclaiming (regeneration) by processes employed offsite. Such oils will have originally been supplied in compliance with a recognized unused mineral insulating oil specification. This document does not differentiate between the methods used to recycle mineral insulating oil. Oils treated on-site (see IEC 60422) are not within the scope of this document.
Oils with and without additives are both within the scope of this document.
This document does not apply to mineral insulating oils used as impregnating medium in cables or capacitors.
This fifth edition cancels and replaces the fourth edition published in 2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
– This International Standard is applicable to specifications and test methods for unused and recycled mineral insulating oils in the delivered state.
– Within the transformer insulating oils, two groups, Type A and Type B, are defined, based on their performance.
– A new method for stray gassing under thermo-oxidative stress of mineral insulating oils, which has been tested in a joint round robin test (RRT) between CIGRE D1 and IEC technical committee 10, has been included.

Fluides pour applications électrotechniques – Huiles minérales isolantes pour matériel électrique

L'IEC 60296:2020 énonce les spécifications et méthodes d'essai pour les huiles minérales isolantes neuves et recyclées (voir l'Article 3 pour les définitions). Il s'applique à l'huile minérale livrée dans le cadre d’un accord contractuel, destinée à être utilisée dans les transformateurs, appareillages de connexion et matériels électriques analogues, dans lesquels l'huile est exigée comme fluide isolant et caloporteur. Une huile neuve ou recyclée relevant du domaine d’application du présent document n’a été ni utilisée dans des matériels électriques ni mise à leur contact ou au contact de tout autre matériel non exigé à sa fabrication, son stockage ou son transport.
Les huiles neuves sont obtenues par raffinage, modification et/ou mélange de produits pétroliers et d’autres hydrocarbures issus de matières premières vierges.
Les huiles recyclées sont produites à partir d'huiles précédemment utilisées comme huiles minérales isolantes dans les matériels électriques et qui ont été soumises à un reraffinage ou à une régénération selon des procédés appliqués hors site. À l'origine, ces huiles ont été fournies conformément à une spécification reconnue relative aux huiles minérales isolantes neuves. Le présent document ne fait pas de distinction entre les méthodes utilisées pour recycler les huiles minérales isolantes. Les huiles traitées sur site (voir l'IEC 60422) ne relèvent pas du domaine d'application du présent document.
Le présent document s'applique aux huiles avec ou sans additifs.
Le présent document ne concerne pas les huiles minérales isolantes utilisées comme imprégnant dans des câbles ou des condensateurs.

General Information

Status
Published
Publication Date
25-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
26-Jun-2020
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IEC 60296
Edition 5.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside

Fluids for electrotechnical applications – Mineral insulating oils for electrical

equipment
Fluides pour applications électrotechniques – Huiles minérales isolantes pour
matériel électrique
IEC 60296:2020-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60296
Edition 5.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside

Fluids for electrotechnical applications – Mineral insulating oils for electrical

equipment
Fluides pour applications électrotechniques – Huiles minérales isolantes pour
matériel électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10 ISBN 978-2-8322-8377-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60296:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions .................................................................................................... 10

4 Properties of oil ............................................................................................................. 12

4.1 General ................................................................................................................. 12

4.2 Functional properties ............................................................................................ 12

4.3 Production and stability ......................................................................................... 12

4.4 Performance ......................................................................................................... 13

4.5 Health, safety and environment (HSE) properties .................................................. 13

5 Classification, labelling, identification, general delivery requirements and sampling ....... 13

5.1 Classification and labelling .................................................................................... 13

5.1.1 Classes ......................................................................................................... 13

5.1.2 Antioxidant (oxidation inhibitor) content ......................................................... 13

5.1.3 Lowest cold start energizing temperature (LCSET) ........................................ 14

5.1.4 Labelling and ordering designation ................................................................ 14

5.2 Requirements ....................................................................................................... 14

5.3 Miscibility and compatibility ................................................................................... 14

5.4 Identification and general delivery requirements ................................................... 15

5.5 Sampling............................................................................................................... 15

6 Properties, their significance and test methods .............................................................. 15

6.1 Viscosity ............................................................................................................... 15

6.2 Pour point ............................................................................................................. 16

6.3 Water content ....................................................................................................... 16

6.4 Breakdown voltage ............................................................................................... 16

6.5 Density ................................................................................................................. 16

6.6 Dielectric dissipation factor (DDF) ......................................................................... 17

6.7 Colour and appearance ......................................................................................... 17

6.8 Acidity ................................................................................................................... 17

6.9 Interfacial tension (IFT) ......................................................................................... 17

6.10 Sulphur content..................................................................................................... 17

6.11 Corrosive and potentially corrosive sulphur ........................................................... 17

6.12 Additives (see 3.3) ................................................................................................ 18

6.12.1 General ......................................................................................................... 18

6.12.2 Antioxidants (see 3.4) .................................................................................... 18

6.12.3 Metal passivators........................................................................................... 18

6.12.4 Pour point depressants .................................................................................. 18

6.13 Oxidation stability ................................................................................................. 19

6.14 Flash point ............................................................................................................ 19

6.15 Polycyclic aromatics (PCAs) and polyaromatic hydrocarbons (PAHs) .................... 19

6.16 Polychlorinated biphenyl content (PCBs)............................................................... 19

6.17 2-furfural (2-FAL) and related compounds content ................................................ 19

6.18 DBDS content ....................................................................................................... 20

6.19 Stray gassing under thermo-oxidative stress ......................................................... 20

7 Additional properties ...................................................................................................... 24

---------------------- Page: 4 ----------------------
IEC 60296:2020 © IEC 2020 – 3 –

7.1 General ................................................................................................................. 24

7.2 Electrostatic charging tendency (ECT) .................................................................. 24

7.3 Gassing tendency ................................................................................................. 24

7.4 Thermal properties ................................................................................................ 25

7.5 Properties connected with consistency (aromatic content, distribution of

PAHs, refractive index) ......................................................................................... 25

7.6 Lubricating properties ........................................................................................... 25

7.7 Particle content ..................................................................................................... 25

7.8 Foaming................................................................................................................ 25

7.9 Transformer oil test equivalents ............................................................................ 25

Annex A (normative) Method for stray gassing under thermo-oxidative stress ...................... 26

A.1 Overview of the method ........................................................................................ 26

A.2 Required materials ................................................................................................ 26

A.3 Pretreatment of syringes ....................................................................................... 26

A.4 Procedure A: stray gassing under oxidative conditions (high oxygen content) ....... 27

A.4.1 Pretreatment of mineral oil ............................................................................. 27

A.4.2 Filling syringes with mineral oil ...................................................................... 27

A.4.3 Incubation procedure ..................................................................................... 27

A.4.4 Dissolved gas analysis .................................................................................. 27

A.5 Procedure B: stray gassing under inert conditions (low oxygen content) ............... 27

A.6 Reporting .............................................................................................................. 28

A.6.1 Test report ..................................................................................................... 28

A.6.2 Evaluation of the stray gassing behaviour of the oil ....................................... 28

A.7 Precision data ....................................................................................................... 28

A.7.1 General ......................................................................................................... 28

A.7.2 Repeatability ................................................................................................. 28

A.7.3 Reproducibility ............................................................................................... 28

A.8 Results of the RRT................................................................................................ 29

A.8.1 General ......................................................................................................... 29

A.8.2 Stray gassing pattern 1 .................................................................................. 29

A.8.3 Stray gassing pattern 2 .................................................................................. 30

A.8.4 Stray gassing pattern 3 .................................................................................. 31

A.8.5 Stray gassing pattern 4 .................................................................................. 32

Annex B (informative) Potentially corrosive sulphur ............................................................. 33

B.1 Mechanism of copper sulphide deposition ............................................................. 33

B.2 Corrosive sulphur compounds in oil ...................................................................... 33

B.3 Detection of corrosive sulphur compounds in oils containing passivators .............. 33

B.3.1 General ......................................................................................................... 33

B.3.2 Procedure 1 ................................................................................................... 34

B.3.3 Procedure 2 ................................................................................................... 34

Annex C (informative) Contamination of oils with silicone..................................................... 35

Annex D (informative) Transformer oil test equivalents ........................................................ 36

Bibliography .......................................................................................................................... 38

Figure A.1 – Syringes with and without copper ...................................................................... 27

Figure A.2 – Stray gassing pattern 1 ..................................................................................... 29

Figure A.3 – Stray gassing pattern 2 ..................................................................................... 30

Figure A.4 – Stray gassing pattern 3 ..................................................................................... 31

---------------------- Page: 5 ----------------------
– 4 – IEC 60296:2020 © IEC 2020

Figure A.5 – Stray gassing pattern 4 ..................................................................................... 32

Table 1 – Meaning of the identifying letter codes in the ordering designation of mineral

oil according to IEC 60296 .................................................................................................... 14

Table 2 – Maximum viscosity and pour point of mineral insulating oil .................................... 16

Table 3 – General specifications, Type A (fully inhibited high grade oils) .............................. 21

Table 4 – General specifications, Type B (uninhibited and inhibited

standard grade oils) .............................................................................................................. 23

Table D.1 – Some transformer oil test equivalents ................................................................ 36

---------------------- Page: 6 ----------------------
IEC 60296:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
MINERAL INSULATING OILS FOR ELECTRICAL EQUIPMENT
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60296 has been prepared by IEC technical committee 10: Fluids

for electrotechnical applications.

This fifth edition cancels and replaces the fourth edition published in 2012. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

– This International Standard is applicable to specifications and test methods for unused

and recycled mineral insulating oils in the delivered state.

– Within the transformer insulating oils, two groups, Type A and Type B, are defined, based

on their performance.

– A new method for stray gassing under thermo-oxidative stress of mineral insulating oils,

which has been tested in a joint round robin test (RRT) between CIGRE D1 and
IEC technical committee 10, has been included.
---------------------- Page: 7 ----------------------
– 6 – IEC 60296:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
10/1117/FDIS 10/1118/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document 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 document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 8 ----------------------
IEC 60296:2020 © IEC 2020 – 7 –
INTRODUCTION

WARNING – This document does not purport to address all the safety problems associated

with its use. It is the responsibility of the user of this document to establish appropriate health

and safety practices and determine the applicability of regulatory limitations prior to use.

The mineral insulating oils which are the subject of this document should be handled in

compliance with local regulations and suppliers safety data-sheets.

This document is applicable to mineral insulating oils, chemicals and used sample containers.

The disposal of these items should be carried out according to local regulations with regard to

their impact on the environment.
---------------------- Page: 9 ----------------------
– 8 – IEC 60296:2020 © IEC 2020
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
MINERAL INSULATING OILS FOR ELECTRICAL EQUIPMENT
1 Scope

This document provides specifications and test methods for unused and recycled mineral

insulating oils (see Clause 3 for definitions). It applies to mineral oil delivered according to the

contractual agreement, intended for use in transformers, switchgear and similar electrical

equipment in which oil is required for insulation and heat transfer. Both unused oil and

recycled oil under the scope of this document have not been used in, nor been in contact with

electrical equipment or other equipment not required for manufacture, storage or transport.

Unused oils are obtained by refining, modifying and/or blending of petroleum products and

other hydrocarbons from virgin feedstock.

Recycled oils are produced from oils previously used as mineral insulating oils in electrical

equipment that have been subjected to re-refining or reclaiming (regeneration) by processes

employed offsite. Such oils will have originally been supplied in compliance with a recognized

unused mineral insulating oil specification. This document does not differentiate between the

methods used to recycle mineral insulating oil. Oils treated on-site (see IEC 60422) are not

within the scope of this document.
Oils with and without additives are both within the scope of this document.

This document does not apply to mineral insulating oils used as impregnating medium in

cables or capacitors.
2 Normative references

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.

IEC 60156, Insulating liquids – Determination of the breakdown voltage at power frequency –

Test method

IEC 60247, Insulating liquids – Measurement of relative permittivity, dielectric dissipation

factor (tan δ) and d.c. resistivity

IEC 60422:2013, Mineral insulating oils in electrical equipment – Supervision and

maintenance guidance
IEC 60475, Method of sampling liquid dielectrics

IEC 60567:2011, Oil-filled electrical equipment – Sampling of gases and analysis of free and

dissolved gases – Guidance

IEC 60628:1985, Gassing of insulating liquids under electrical stress and ionization

IEC 60666:2010, Detection and determination of specified additives in mineral insulating oils

---------------------- Page: 10 ----------------------
IEC 60296:2020 © IEC 2020 – 9 –

IEC 60814, Insulating liquids – Oil-impregnated paper and pressboard – Determination of

water by automatic coulometric Karl Fischer titration
IEC 60970, Insulating liquids – Methods for counting and sizing particles

IEC 61125:2018, Insulating liquids – Test methods for oxidation stability – Test method for

evaluating the oxidation stability of insulating liquids in the delivered state

IEC 61198, Mineral insulating oils – Methods for the determination of 2-furfural and related

compounds

IEC 61619, Insulating liquids – Contamination by polychlorinated biphenyls (PCBs) – Method

of determination by capillary column gas chromatography

IEC 61620, Insulating liquids – Determination of the dielectric dissipation factor by

measurement of the conductance and capacitance – Test method

IEC 61868, Mineral insulating oils – Determination of kinematic viscosity at very low

temperatures

IEC 62021-1, Insulating liquids – Determination of acidity – Part 1: Automatic potentiometric

titration

IEC 62021-2, Insulating liquids – Determination of acidity – Part 2: Colourimetric titration

IEC 62535:2008, Insulating liquids – Test method for detection of potentially corrosive sulphur

in used and unused insulating oils

IEC 62697-1, Test methods for quantitative determination of corrosive sulfur compounds in

unused and used insulating liquids – Part 1: Test method for quantitative determination of

dibenzyldisulfide (DBDS)

IEC 62961, Insulating liquids – Test methods for the determination of interfacial tension of

insulating liquids – Determination with the ring method
ISO 2049, Petroleum products, Determination of colour (ASTM scale)
ISO 2719, Determination of flash point – Pensky-Martens closed cup method

ISO 3016, Petroleum and related products from natural or synthetic sources – Determination

of pour point

ISO 3104, Petroleum products – Transparent and opaque liquids – Determination of kinematic

viscosity and calculation of dynamic viscosity

ISO 3675, Crude petroleum and liquid petroleum products – Laboratory determination of

density – Hydrometer method
ISO 3819, Laboratory glassware –Beakers

ISO 8754, Petroleum products – Determination of sulphur content – Energy-dispersive X-ray

fluorescence spectrometry

ISO 12185, Crude petroleum and petroleum products – Determination of density – Oscillating

U-tube method
---------------------- Page: 11 ----------------------
– 10 – IEC 60296:2020 © IEC 2020

ISO 14596, Petroleum products – Determination of sulphur content – Wavelength-dispersive

X-ray fluorescence spectrometry

ASTM D971, Standard Test Method for Interfacial Tension of Oil Against Water by the Ring

Method
ASTM D1500, Standard Test Method fo
...

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