EN 61099:2010

Insulating liquids - Specifications for unused synthetic organic esters for electrical purposes

IEC 61099:2010 covers the specification and test methods for unused synthetic organic esters. It applies to synthetic organic esters, delivered to the agreed point and time of delivery intended, for use in transformers, switchgear and similar related equipment in which synthetic organic esters are required as an insulant and for heat transfer. The main changes of this new edition with respect to the previous one relate to the aim of giving a more updated specification of synthetic organic esters when used as insulating liquids.

Isolierflüssigkeiten - Anforderungen an neue synthetische organische Ester für elektrotechnische Zwecke

Liquides isolants - Spécifications relatives aux esters organiques de synthèse neufs destinés aux matériels électriques

La CEI 61099:2010 couvre les spécifications et les méthodes d'essai relatives aux esters organiques de synthèse neufs. Elle est applicable aux esters organiques de synthèse, livrés au lieu et à la date de livraison convenus, destinés à être utilisés dans les transformateurs, les appareillages de connexion et matériels connexes analogues dans lesquels les esters organiques de synthèse sont exigés comme isolant et pour le transfert de chaleur. Les modifications principales de cette nouvelle édition par rapport à l'édition précédente ont pour objectif de fournir une spécification plus à jour concernant les esters organiques de synthèse lorsqu'ils sont utilisés en tant que liquides isolants.

Izolacijske tekočine - Specifikacije za neuporabljene sintetične organske estre za elektrotehniko (IEC 61099:2010)

Ta mednarodni standard zajema specifikacijo in preskusne metode za neuporabljene sintetične organske estre. Velja za sintetične organske estre, dostavljene na dogovorjeno mesto v predvidenem času, za uporabo v transformatorjih, stikalnih napravah in podobni povezani opremi, v kateri so sintetični organski estri potrebni kot izolator in za prenos toplote. Ti neuporabljeni sintetični organski estri se pridobivajo s kemično predelavo in mehansko obdelavo maščobnih kislin in poliolov.

General Information

• Status: Published
• Publication Date: 11-Nov-2010
• Withdrawal Date: 31-Oct-2013
• ICS: 29.040 - Insulating fluids
• Technical Committee: CLC/SR 10 - Fluids for electrotechnical applications
• Drafting Committee: IEC/TC 10 - IEC_TC_10
• Parallel Committee: IEC/TC 10 - IEC_TC_10
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 12-Nov-2010
• Completion Date: 12-Nov-2010
• Ref Project: SIST EN 61099:2011 - Insulating liquids - Specifications for unused synthetic organic esters for electrical purposes (IEC 61099:2010)

Relations

• Replaces: EN 61099:1992 - Specification for unused synthetic organic esters for electrical purposes
• Effective Date: 28-Jan-2023

Overview - EN 61099:2010 / IEC 61099:2010

EN 61099:2010 (identical to IEC 61099:2010) defines specifications and test methods for unused synthetic organic esters used as insulating liquids. It applies to esters delivered for use in transformers, switchgear and similar electrical equipment where the ester functions as an insulant and heat-transfer fluid. This edition updates the earlier 1992 specification to reflect current performance, safety and test-method expectations.

Key topics and technical requirements

The standard addresses the full set of properties and procedures needed to specify and verify synthetic ester insulating fluids:

• Scope and definitions - applicability to unused esters produced from fatty acids and polyols; distinction from maintenance standards (see IEC 61203).
• Health, safety & environment (HSE) - flash/fire point, biodegradability, toxicity, safe handling, storage and disposal guidance.
• Classification, identification and delivery - labelling, sampling, packaging and storage requirements; representative sampling procedures.
• Physical properties & test methods - colour, appearance, density, kinematic viscosity, pour/crystallization behavior, water content (Karl Fischer), acidity and oxidation stability.
• Electrical properties & test methods - breakdown voltage (IEC 60156), dielectric dissipation factor, relative permittivity and d.c. resistivity (IEC 60247), and gassing tendency.
• Specifications for application types - specific requirements for esters used in transformers; an informative annex covers capacitors.
• Normative references - links to related test standards (IEC 60156, IEC 60247, IEC 60475, IEC 61620, IEC 62021, IEC 61125, ISO and OECD methods).

Note: EN 61099 specifies methods and performance expectations but does not prescribe numerical limits in this summary - refer to the full document for exact acceptance criteria and test conditions.

Practical applications and users

EN 61099 is essential for professionals involved in electrical fluids and equipment procurement, testing and design:

• Transformer and switchgear manufacturers specifying insulating fluids.
• Utilities and asset owners performing acceptance testing and procurement.
• Test laboratories conducting dielectric and chemical analyses.
• Specifications engineers responsible for material compatibility and safety.
• Environmental, health & safety teams managing storage, handling and disposal.

Typical uses include supplier qualification, batch acceptance testing, material data sheets, safety documentation and selecting biodegradable or fire-safe insulating fluids.

Related standards

Relevant companion standards and test methods referenced by EN 61099 include:

• IEC 60156 (breakdown voltage)
• IEC 60247 (permittivity, tan δ, d.c. resistivity)
• IEC 61203 (maintenance of insulating liquids)
• IEC 61125 (oxidation stability testing)
• IEC 61620, IEC 62021 (acidity and dielectric dissipation)
• ISO and OECD methods for viscosity, flash point and biodegradability

EN 61099:2010 provides a modern, harmonized basis for specifying and testing synthetic organic esters in electrical applications - helping ensure reliable dielectric performance, safe handling and environmental compliance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2011
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SIST EN 61099:1997
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Insulating liquids - Specifications for unused synthetic organic esters for electrical
purposes (IEC 61099:2010)
Isolierflüssigkeiten - Anforderungen an neue synthetische organische Ester für
elektrotechnische Zwecke (IEC 61099:2010)
Liquides isolants - Spécifications relatives aux esters organiques de synthèse neufs
destinés aux matériels électriques (CEI 61099:2010)
Ta slovenski standard je istoveten z: EN 61099:2010
ICS:
29.040.01 Izolacijski fluidi na splošno Insulating fluids in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61099
NORME EUROPÉENNE
November 2010
EUROPÄISCHE NORM
ICS 29.040 Supersedes EN 61099:1992

English version
Insulating liquids -
Specifications for unused synthetic organic esters for electrical purposes
(IEC 61099:2010)
Liquides isolants -  Isolierflüssigkeiten -
Spécifications relatives aux esters Anforderungen an neue synthetische
organiques de synthèse neufs destinés organische Ester für elektrotechnische
aux matériels électriques Zwecke
(CEI 61099:2010) (IEC 61099:2010)

This European Standard was approved by CENELEC on 2010-11-01. 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 Central Secretariat 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 Central Secretariat 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 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

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61099:2010 E
Foreword
The text of document 10/813/FDIS, future edition 2 of IEC 61099, prepared by IEC TC 10, Fluids for
electrotechnical applications, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61099 on 2010-11-01.
This European Standard supersedes EN 61099:1992.
The main changes with respect to EN 61099:1992 relate to the aim of giving a more updated specification
of synthetic organic esters when used as insulating liquids.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61099:2010 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 61203 NOTE  Harmonized as EN 61203.
__________
- 3 - EN 61099:2010
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

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 60475 - Method of sampling liquid dielectrics - -

IEC 60628 1985 Gassing of insulating liquids under electrical HD 488 S1 1987
stress and ionization
IEC 60814 - Insulating liquids - Oil-impregnated paper and EN 60814 -
pressboard - Determination of water by
automatic coulometric Karl Fischer titration

IEC 61039 - Classification of insulating liquids EN 61039 -

IEC 61125 1992 Unused hydrocarbon-based insulating liquids - EN 61125 1993
Test methods for evaluating the oxidation
stability
IEC 61620 - Insulating liquids - Determination of the EN 61620 -
dielectric dissipation factor by measurement of
the conductance and capacitance - Test method

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

ISO 2211 - Liquid chemical products - Measurement of - -
colour in Hazen units (platinum-cobalt scale)

ISO 2592 - Determination of flash and fire points - EN ISO 2592 -
Cleveland open cup method
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

Publication Year Title EN/HD Year

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
OECD 301 1992 OECD guidelines for the testing of chemicals - - -
Ready Biodegradability
IEC 61099 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating liquids – Specifications for unused synthetic organic esters for
electrical purposes
Liquides isolants – Spécifications relatives aux esters organiques de synthèse
neufs destinés aux matériels électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 29.040 ISBN 978-2-88912-160-1
– 2 – 61099 © IEC:2010
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 General remarks.7
5 Health, safety and environment (HSE) properties (liquid properties related to safe
handling and environment protection) .8
5.1 Flash point and fire point .8
5.2 Biodegradation .8
5.3 Toxicity .8
6 Classification, identification, general delivery requirements, sampling, packaging
and disposal .8
6.1 Classification.8
6.2 Identification and general delivery requirements, sampling, packaging and
disposal.8
6.3 Storage .8
6.4 Representative sampling .9
6.5 Disposal and spillages.9
7 Properties of synthetic organic esters .9
7.1 Physical properties, significance and test methods.9
7.1.1 Colour .9
7.1.2 Appearance .9
7.1.3 Density .9
7.1.4 Kinematic viscosity .9
7.1.5 Flash point and fire point .9
7.1.6 Pour point.9
7.1.7 Crystallization.9
7.1.8 Water content .9
7.1.9 Acidity .9
7.1.10 Oxidation stability .10
8 Electrical properties.10
8.1 Breakdown voltage .10
8.2 Dielectric dissipation factor, permittivity and d.c. resistivity.10
8.3 Gassing tendency.10
9 Specifications for synthetic organic esters used in transformers .10
Annex A (informative) Determination of crystallization .12
Annex B (informative) Specifications for synthetic organic esters used in capacitors.13
Bibliography.14

61099 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATING LIQUIDS –
SPECIFICATIONS FOR UNUSED SYNTHETIC
ORGANIC ESTERS FOR ELECTRICAL PURPOSES

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 61099 has been prepared IEC technical committee 10: Fluids for
electrotechnical applications.
This second edition cancels and replaces the first edition published in 1992 and constitutes a
technical revision.
The main changes with respect to the previous edition relate to the aim of giving a more
updated specification of synthetic organic esters when used as insulating liquids.

– 4 – 61099 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
10/813/FDIS 10/821/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.
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