Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear

Will supersede EN 60296:2004

Flüssigkeiten für elektrotechnische Anwendungen - Neue Isolieröle für Transformatoren und Schaltgeräte

Fluides pour applications électrotechniques - Huiles minérales isolantes neuves pour transformateurs et appareillages de connexion

NEW! La CEI 60296:2012 est maintenant disponible sous forme de IEC Standards+ 60296:2012 qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente. La CEI 60296:2012 s'applique aux spécifications et méthodes d'essais pour les huiles minérales isolantes neuves. Elle s'applique à l'huile destinée à l'utilisation dans les transformateurs, disjoncteurs et matériels électriques analogues, dans lesquels l'huile est nécessaire comme fluide isolant et caloporteur. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - des spécifications pour les composés soufrés corrosifs qui peuvent entraîner un dépôt de sulfure de cuivre à l'intérieur des transformateurs (dans les huiles non-passivées et passivées); - les définitions d'additifs dans l'huile; et - la ré-insertion d'une note manquante concernant l'oxydation.

Tekočine za elektrotehniko - Nerabljena mineralna izolacijska olja za transformatorje in omrežne stikalne naprave

Specifikacija sprejemljivosti, dodatki, prebojna napetost, razvrstitev, jedkost, jedke snovi, definicije, dobavni pogoji, gostota, dielektrik, faktor razsipanja, elektroinženiring, elektroizolacijski materiali, plamenišče, goriva, odvajanje toplote, identifikacija, izolacijska olja, mejne vrednosti (matematika), merjenje, merilne tehnike, mineralna olja, olja, oksidacija, točka tečenja, lastnosti, čistoča, upornost, metode vzorčenja, saponifikacijsko število, specifikacija (odobritev), specifikacije, stabilnost, žveplo, stikalna naprava, preskušanje, transformatorsko olje, transformatorji, nerabljeno, viskoznost

General Information

Status
Published
Publication Date
14-May-2012
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-May-2012
Due Date
12-Jul-2012
Completion Date
15-May-2012

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 60296:2012
01-julij-2012
7HNRþLQH]DHOHNWURWHKQLNR1HUDEOMHQDPLQHUDOQDL]RODFLMVNDROMD]D
WUDQVIRUPDWRUMHLQRPUHåQHVWLNDOQHQDSUDYH

Fluids for electrotechnical applications - Unused mineral insulating oils for transformers

and switchgear

Flüssigkeiten für elektrotechnische Anwendungen - Neue Isolieröle für Transformatoren

und Schaltgeräte

Fluides pour applications électrotechniques - Huiles minérales isolantes neuves pour

transformateurs et appareillages de connexion
Ta slovenski standard je istoveten z: EN 60296:2012
ICS:
29.040.10 Izolacijska olja Insulating oils
SIST EN 60296:2012 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60296:2012
---------------------- Page: 2 ----------------------
SIST EN 60296:2012
EUROPEAN STANDARD
EN 60296
NORME EUROPÉENNE
April 2012
EUROPÄISCHE NORM
ICS 29.040 Supersedes EN 60296:2004 + corr. Sep.2004
English version
Fluids for electrotechnical applications -
Unused mineral insulating oils for transformers and switchgear
(IEC 60296:2012)
Fluides pour applications Flüssigkeiten für elektrotechnische
électrotechniques - Anwendungen -
Huiles minérales isolantes neuves pour Neue Isolieröle auf Mineralölbasis für
transformateurs et appareillages de Transformatoren und Schaltgeräte
connexion (IEC 60296:2012)
(CEI 60296:2012)

This European Standard was approved by CENELEC on 2012-03-26. 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, Romania, Slovakia, Slovenia,

Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60296:2012 E
---------------------- Page: 3 ----------------------
SIST EN 60296:2012
EN 60296:2012 - 2 -
Foreword

The text of document 10/878/FDIS, future edition 4 of IEC 60296, prepared by IEC/TC 10 "Fluids for

electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN 60296:2012.
The following dates are fixed:
(dop) 2012-12-26
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-03-26
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60296:2004 + corrigendum September 2004.

EN 60296:2012 includes the following significant technical changes with respect to EN 60296:2004:

– specifications for corrosive sulphur compounds that can lead to copper sulphide deposition in

transformers (in non-passivated and passivated oils);
– definitions of additives in oil; and
– re-insertion of a missing note on oxidation.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent

rights.
Endorsement notice

The text of the International Standard IEC 60296:2012 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60867 NOTE Harmonized as EN 60867.
---------------------- Page: 4 ----------------------
SIST EN 60296:2012
- 3 - EN 60296:2012
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
- - Surface active agents - Determination of EN 14210 -
interfacial tension of solutions of surface
active agents by the stirrup or ring method
IEC 60076-2 - Power transformers - EN 60076-2 -
Part 2: Temperature rise for liquid-immersed
transformers
IEC 60156 - Insulating liquids - Determination of the EN 60156 -
breakdown voltage at power frequency - Test
method
IEC 60247 - Insulating liquids - Measurement of relative EN 60247 -
permittivity, dielectric dissipation factor (tan d)
and d.c. resistivity
IEC 60422 - Mineral insulating oils in electrical equipment - EN 60422 -
Supervision and maintenance guidance
IEC 60475 - Method of sampling insulating liquids EN 60475 -
IEC 60628 1985 Gassing of insulating liquids under electrical HD 488 S1 1987
stress and ionization
IEC 60666 - Detection and determination of specified EN 60666 -
additives in mineral insulating oils
IEC 60814 - Insulating liquids - Oil-impregnated paper and EN 60814 -
pressboard - Determination of water by
automatic coulometric Karl Fischer titration
IEC 60970 - Insulating liquids - Methods for counting and EN 60970 -
sizing particles
IEC 61125 1992 Unused hydrocarbon-based insulating liquids -EN 61125 1993
+ corr. September 1992 Test methods for evaluating the oxidation + A1 2004
+ A1 2004 stability
IEC 61198 - Mineral insulating oils - Methods for the EN 61198 -
determination of 2-furfural and related
compounds
IEC 61619 - Insulating liquids - Contamination by EN 61619 -
polychlorinated biphenyls (PCBs) - Method of
determination by capillary column gas
chromatography
IEC 61620 - Insulating liquids - Determination of the EN 61620 -
dielectric dissipation factor by measurement of
the conductance and capacitance - Test
method
IEC 61868 - Mineral insulating oils - Determination of EN 61868 -
kinematic viscosity at very low temperatures
---------------------- Page: 5 ----------------------
SIST EN 60296:2012
EN 60296:2012 - 4 -
Publication Year Title EN/HD Year
IEC 62021-1 - Insulating liquids - Determination of acidity - EN 62021-1 -
Part 1: Automatic potentiometric titration
IEC 62021-2 - Insulating liquids - Determination of acidity - EN 62021-2 -
Part 2: Colourimetric titration
IEC 62535 2008 Insulating liquids - Test method for detection EN 62535 2009
of potentially corrosive sulphur in used and
unused insulating oil
ISO 2719 - Determination of flash point - Pensky-Martens EN ISO 2719 -
closed cup method
ISO 3016 - Petroleum products - Determination of pour - -
point
ISO 3104 - Petroleum products - Transparent and opaque EN ISO 3104 -
liquids - Determination of kinematic viscosity
and calculation of dynamic viscosity
ISO 3675 - Crude petroleum and liquid petroleum EN ISO 3675 -
products - Laboratory determination
of density - Hydrometermethod
ISO 12185 - Crude petrolelum and petroleum products - EN ISO 12185 -
Determination of density - Oscillating U-tube
method
ISO 14596 - Petroleum products - Determination of sulfur EN ISO 14596 -
content - Wavelength-dispersive X-ray
fluorescence spectrometry
ASTM D971 - Standard test method for interfacial tension of - -
oil against water by the ring method
ASTM D7150 - Standard test method for the determination of - -
gassing characteristics of insulating liquids
under thermal stress at low temperature
DIN 51353 - Testing of insulating oils; detection of - -
corrosive sulfur; silver strip test
IP 346 - Determination of polycyclic aromatics in - -
lubricant base oils and asphaltene free
petroleum fractions - Dimethylsulfoxide
refractive method
IP 373 - Determination of the sulphur content of light - -
and middle distillates - Oxidative
microcoulometry
---------------------- Page: 6 ----------------------
SIST EN 60296:2012
- 5 - EN 60296:2012
Annex ZB
(normative)
Special national conditions

Special national condition: National characteristic or practice that cannot be changed even over a long

period, e.g. climatic conditions, electrical earthing conditions.

NOTE If it affects harmonization, it forms part of the European Standard / Harmonization Document.

For the countries in which the relevant special national conditions apply these provisions are normative,

for other countries they are informative.
Clause Special national condition
7.1 Austria

The restricted limits of Chapter 7.1 “Higher oxidation stability and low sulphur content” are

to be followed as general specification for oxidation stability (See Table 2).
Because of exposed geographical location and cold weather conditions (snow)

transformers are not always accessible for service, which sometimes leads to unforeseen

longer service intervals and therefore higher oxidation stability of transformer oil is

required.

For the same reason and to have an additional criterion for evaluation of oil quality,

Interfacial Tension (IFT) is to be used as a general requirement (Table 2, Footnote f)”

__________
---------------------- Page: 7 ----------------------
SIST EN 60296:2012
---------------------- Page: 8 ----------------------
SIST EN 60296:2012
IEC 60296
Edition 4.0 2012-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fluids for electrotechnical applications – Unused mineral insulating oils for
transformers and switchgear
Fluides pour applications électrotechniques – Huiles minérales isolantes neuves
pour transformateurs et appareillages de connexion
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 29.040 ISBN 978-2-88912-928-7

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: 9 ----------------------
SIST EN 60296:2012
– 2 – 60296 © IEC:2012
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope ............................................................................................................................... 7

2 Normative references ....................................................................................................... 7

3 Terms and definitions ....................................................................................................... 9

4 Properties of oil .............................................................................................................. 10

4.1 Functional properties ............................................................................................. 10

4.2 Refining and stability ............................................................................................. 10

4.3 Performance .......................................................................................................... 10

4.4 Health, safety and environment (HSE) properties .................................................. 10

5 Classification, identification, general delivery requirements and sampling....................... 11

5.1 Classification ......................................................................................................... 11

5.1.1 Classes ..................................................................................................... 11

5.1.2 Antioxidant additive (inhibitor) content ....................................................... 11

5.1.3 Lowest cold start energizing temperature (LCSET) .................................... 11

5.2 Requirements ........................................................................................................ 11

5.3 Miscibility .............................................................................................................. 11

5.4 Identification and general delivery requirements .................................................... 11

5.5 Sampling ............................................................................................................... 12

6 Properties, their significance and test methods ............................................................... 12

6.1 Viscosity................................................................................................................ 12

6.2 Pour point ............................................................................................................. 12

6.3 Water content ........................................................................................................ 12

6.4 Breakdown voltage ................................................................................................ 13

6.5 Dielectric dissipation factor (DDF) ......................................................................... 13

6.6 Appearance ........................................................................................................... 13

6.7 Acidity ................................................................................................................... 13

6.8 Interfacial tension (IFT) ......................................................................................... 13

6.9 Sulphur content ..................................................................................................... 13

6.10 Corrosive and potentially corrosive sulphur ........................................................... 13

6.11 Additives (see 3.4) ................................................................................................ 14

6.11.1 General ..................................................................................................... 14

6.11.2 Antioxidant additives (see 3.5) ................................................................... 14

6.11.3 Metal passivators ...................................................................................... 14

6.11.4 Pour point depressants .............................................................................. 15

6.12 Oxidation stability .................................................................................................. 15

6.13 Gassing tendency .................................................................................................. 15

6.14 Electrostatic charging tendency (ECT) ................................................................... 15

6.15 Flash point ............................................................................................................ 15

6.16 Density .................................................................................................................. 15

6.17 Polycyclic aromatic content (PCAs) ....................................................................... 16

6.18 Polychlorinated biphenyl content (PCBs) ............................................................... 16

6.19 2-Furfural (2-FAL) and related compounds content ................................................ 16

6.20 Particle content ..................................................................................................... 16

---------------------- Page: 10 ----------------------
SIST EN 60296:2012
60296 © IEC:2012 – 3 –

6.21 DBDS content ....................................................................................................... 16

6.22 Stray gassing of oil ................................................................................................ 16

7 Specific requirements for special applications ................................................................ 18

7.1 Higher oxidation stability and low sulphur content ................................................. 18

7.2 Electrostatic charging tendency (ECT) ................................................................... 18

7.3 Gassing tendency .................................................................................................. 18

Annex A (informative) Potentially corrosive sulphur ............................................................. 19

Bibliography .......................................................................................................................... 21

Table 1 – Maximum viscosity and pour point of transformer oil at lowest cold start

energizing temperature (LCSET) ........................................................................................... 12

Table 2 – General specifications ........................................................................................... 17

---------------------- Page: 11 ----------------------
SIST EN 60296:2012
– 4 – 60296 © IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
UNUSED MINERAL INSULATING OILS FOR
TRANSFORMERS AND SWITCHGEAR
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

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

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

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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 fourth edition cancels and replaces the third edition, published in 2003. This edition

constitutes a technical revision.

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

edition:

– specifications for corrosive sulphur compounds that can lead to copper sulphide

deposition in transformers (in non-passivated and passivated oils);
– definitions of additives in oil; and
– re-insertion of a missing note on oxidation.
---------------------- Page: 12 ----------------------
SIST EN 60296:2012
60296 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
10/878/FDIS 10/885/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

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

The committee has decided that the contents of this publication 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.
---------------------- Page: 13 ----------------------
SIST EN 60296:2012
– 6 – 60296 © IEC:2012
INTRODUCTION

This International Standard does not purport to address all the safety problems associated

with its use. It is the responsibility of the user of the standard 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 standard should be handled with due

regard to personal hygiene. Direct contact with the eyes may cause irritation. In the case of

eye contact, irrigation with copious quantities of clean running water should be carried out

and medical advice sought. Some of the tests specified in this standard involve the use of

processes that could lead to a hazardous situation. Attention is drawn to the relevant standard

for guidance.

This standard 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. Every precaution should be taken to prevent release of

mineral insulating oil into the environment.
---------------------- Page: 14 ----------------------
SIST EN 60296:2012
60296 © IEC:2012 – 7 –
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
UNUSED MINERAL INSULATING OILS FOR
TRANSFORMERS AND SWITCHGEAR
1 Scope

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

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

point and time of delivery, intended for use in transformers, switchgear and similar electrical

equipment in which oil is required for insulation and heat transfer. These oils are obtained by

refining, modifying and/or blending of petroleum products and other hydrocarbons.

Oils with and without additives are both within the scope of this standard.
This standard is applicable only to unused mineral insulating oils.
Recycled oils are beyond the scope of this standard.

NOTE Definitions and specifications for recycled oils will be covered by IEC 62701 .

This standard does not apply to mineral insulating oils used as impregnants in cables or

capacitors.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60076-2, Power transformers – Part 2: Temperature rise for liquid-immersed transformers

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, Mineral insulating oils in electrical equipment – Supervision and maintenance

guidance
IEC 60475, Method of sampling liquid dielectrics

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

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

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

water by automatic coulometric Karl Fischer titration
—————————
In preparation.
---------------------- Page: 15 ----------------------
SIST EN 60296:2012
– 8 – 60296 © IEC:2012
IEC 60970, Insulating liquids – Methods for counting and sizing particles

IEC 61125:1992, Unused hydrocarbon-based insulating liquids – Test methods for evaluating

the oxidation stability
Amendment 1 (2004)

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
ISO 2719, Determination of flash point – Pensky-Martens closed cup method
ISO 3016, Petroleum products – 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 12185, Crude petroleum and petroleum products – Determination of density – Oscillating

U-tube method

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

ray fluorescence spectrometry

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

Method

ASTM D7150, Standard Test Method for the Determination of Gassing Characteristics of

Insulating Liquids Under Thermal Stress at Low temperature

DIN 51353, Testing of insulating oils; detection of corrosive sulfur; Silver strip test

EN 14210, Surface active agents – Determination of interfacial tension of solutions of surface

active agents by the stirrup or ring method

IP 346, Determination of polycyclic aromatics in lubricant base oils and asphaltene free

petroleum fractions – Dimethylsulfoxide refractive method
---------------------- Page: 16 ----------------------
SIST EN 60296:2012
60296 © IEC:2012 – 9 –

IP 373, Determination of the sulphur content of light and middle distillates – Oxidative

microcoulometry
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
transformer oil
mineral insulating oil for transformers and similar electrical equipment
3.2
low temperature switchgear oil

mineral insulating oil for oil-filled switchgear for outdoor application in very cold climatic

conditions
3.3
mineral insulating oil

insulating oil obtained by refining, modifying and/or blending of petroleum products and other

hydrocarbons

Note 1 to entry This does not include insulating liquids such as esters, synthetic aromatics or silicone fluids.

3.4
additive
che
...

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