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SLOVENSKI STANDARD
01-maj-2018
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SIST EN 61125:1997
SIST EN 61125:1997/A1:2005
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Insulating liquids - Test methods for oxidation stability - Test method for evaluating the
oxidation stability of insulating liquids in the delivered state
Ta slovenski standard je istoveten z: EN IEC 61125:2018
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 61125
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 29.040.10 Supersedes EN 61125:1993
English Version
Insulating liquids - Test methods for oxidation stability - Test
method for evaluating the oxidation stability of insulating liquids
in the delivered state
(IEC 61125:2018)
Isolants liquides - Méthodes d'essai de la stabilité à Isolierflüssigkeiten - Prüfverfahren für die
l'oxydation - Méthode d'essai pour évaluer la stabilité à Oxidationsbeständigkeit - Prüfverfahren zur Evaluierung der
l'oxydation des isolants liquides tels que livrés Oxidationsbeständigkeit von neuen Isolierflüssigkeiten
(IEC 61125:2018) (IEC 61125:2018)
This European Standard was approved by CENELEC on 2018-02-16. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61125:2018 E
European foreword
The text of document 10/1047/FDIS, future edition 2 of IEC 61125, prepared by IEC/TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61125:2018.
The following dates are fixed:
(dop) 2018-11-16
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-02-16
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61125:1993 and EN 61125:1993/A1:2004.
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.
Endorsement notice
The text of the International Standard IEC 61125:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60296 NOTE Harmonized as EN 60296.
IEC 60666 NOTE Harmonized as EN 60666.
IEC 61099 NOTE Harmonized as EN 61099.
IEC 62021-1 NOTE Harmonized as EN 62021-1.
IEC 62770 NOTE Harmonized as EN 62770.
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 60247 - Insulating liquids - Measurement of relative EN 60247 -
permittivity, dielectric dissipation factor
(tan δ) and d.c. resistivity
IEC 62021-2 - Insulating liquids - Determination of acidity EN 62021-2 -
- Part 2: Colourimetric titration
IEC 62021-3 - Insulating liquids - Determination of acidity EN 62021-3 -
- Part 3: Test methods for non-mineral
insulating oils
IEC 60422 2013 Mineral insulating oils in electrical EN 60422 2013
equipment - Supervision and maintenance
guidance
ISO 383 - Laboratory glassware; Interchangeable - -
conical ground joints
ISO 4793 - Laboratory sintered (fritted) filters; Porosity - -
grading, classification and designation
ISO 6344-1 - Coated abrasives - Grain size analysis - - -
Part 1: Grain size distribution test
ISO 3104 - Petroleum products - Transparent and EN ISO 3104 -
opaque liquids - Determination of kinematic
viscosity and calculation of dynamic
viscosity
ASTM E287 - Standard specification for laboratory glass - -
graduated burets
IEC 61125
Edition 2.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Insulating liquids – Test methods for oxidation stability
Test method for evaluating the oxidation stability of insulating liquids in the
delivered state
Isolants liquides – Méthodes d’essai de la stabilité à l’oxydation
Méthode d’essai pour évaluer la stabilité à l’oxydation des isolants liquides tels
que livrés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10 ISBN 978-2-8322-5210-9
– 2 – IEC 61125:2018 © IEC 2018
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Apparatus . 9
4.1 General principle of the method . 9
4.2 Equipment . 9
4.2.1 Heating arrangement . 9
4.2.2 Test vessels . 10
4.2.3 Absorption tubes. 10
4.2.4 Filtering crucibles . 10
4.2.5 Porcelain vessels. 11
4.2.6 Flowmeter. 11
4.2.7 Timer . 11
4.2.8 Gas supply . 11
4.2.9 Analytical balance . 11
4.2.10 Burette . 11
4.2.11 Volumetric pipette . 11
4.2.12 Volumetric flask . 12
4.2.13 Graduated measuring cylinder . 12
4.2.14 Thermometer . 12
4.2.15 Erlenmeyer flask . 12
4.3 Reagents . 12
4.3.1 Normal heptane . 12
4.3.2 Alkali blue 6B indicator according to IEC 62021-2 . 12
4.3.3 Phenolphthalein indicator . 12
4.3.4 Potassium hydroxide according to IEC 62021-2 . 12
4.3.5 Oxidant gas . 12
4.3.6 Acetone . 12
4.4 Cleaning of test vessels . 12
4.5 Catalyst . 13
4.6 Insulating liquid sample conditioning . 13
4.7 Preparation of the test . 13
4.8 Determinations on the oxidized insulating liquid . 13
4.8.1 Sludge formation . 13
4.8.2 Soluble acidity (SA) . 14
4.8.3 Volatile acidity (VA) . 14
4.8.4 Total acidity (TA) . 15
4.8.5 Dielectric dissipation factor (DDF) . 15
4.8.6 Oxidation rate with air . 15
4.8.7 Induction period with air (IP with air) (optional) . 15
4.9 Report. 15
4.10 Precision . 16
4.10.1 General . 16
4.10.2 Repeatability (r) (95 % confidence) . 16
4.10.3 Reproducibility (R) (95 % confidence) . 16
IEC 61125:2018 © IEC 2018 – 3 –
Annex A (normative) Thermometer specifications . 20
Annex B (informative) Method for evaluating the oxidation stability of inhibited
insulating liquids in the delivery state by measurement of the induction period with
oxygen . 21
B.1 Outline of the method . 21
B.2 Reagents and test conditions . 21
B.3 Procedure . 21
B.3.1 General . 21
B.3.2 Preparation of the test . 21
B.3.3 Oxidation . 22
B.3.4 Determination of the induction period with oxygen . 22
B.3.5 Determinations on the oxidized oil (optional). 22
B.4 Report. 23
B.5 Precision .
...