I S En62021-3-2014
I S En62021-3-2014
I S En62021-3-2014
I.S. EN 62021-3:2014
© CENELEC 2014 No copying without NSAI permission except as permitted by copyright law.
I.S. EN 62021-3:2014
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2014-12-03
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ICS 29.040.10
English Version
Liquides isolants - Détermination de l'acidité - Partie 3: Isolierflüssigkeiten - Bestimmung des Säuregehaltes - Teil
Méthode d'essai pour les huiles non minérales isolantes 3: Prüfverfahren für Isolieröle auf Nichtmineralölbasis
(CEI 62021-3:2014) (IEC 62021-3:2014)
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This European Standard was approved by CENELEC on 2014-04-23. 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.
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Foreword
The text of document 10/936/FDIS, future edition 1 of IEC 62021-3, prepared by IEC TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62021-3:2014.
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.
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Endorsement notice
The text of the International Standard IEC 62021-3:2014 was approved by CENELEC as a European
Standard without any modification.
I.S. EN 62021-3:2014
-3- EN 62021-3:2014
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 1 When 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 60475 - Method of sampling insulating liquids EN 60475 -
ISO 5725 series Accuracy (trueness and precision) of - series
measurement methods and results
ISO 6619 - Petroleum products and lubricants; - -
neutralization number; potentiometric
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titration method
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IEC 62021-3
®
Edition 1.0 2014-03
INTERNATIONAL
STANDARD
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I.S. EN 62021-3:2014
IEC 62021-3
®
Edition 1.0 2014-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE colour
inside
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INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE PRICE CODE
CODE PRIX T
ICS 29.040.10 ISBN 978-2-8322-1404-6
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CONTENTS
FOREWORD ........................................................................................................................... 4
INTRODUCTION ..................................................................................................................... 6
1 Scope .............................................................................................................................. 7
2 Normative references ...................................................................................................... 7
3 Terms and definitions ...................................................................................................... 7
4 Method A: Automatic potentiometric titration .................................................................... 8
4.1 Principle ............................................................................................................ 8
4.2 Reagents and auxiliary products ........................................................................ 8
4.2.1 Reagents .......................................................................................... 8
4.2.2 Titration reagent ............................................................................... 8
4.2.3 Titration solvent ................................................................................ 8
4.2.4 Potassium hydrogen phthalate, primary standard .............................. 9
4.2.5 Reference electrode electrolyte ........................................................ 9
4.2.6 Aqueous buffer solutions .................................................................. 9
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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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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.
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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6) All users should ensure that they have the latest edition of this publication.
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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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 62021-3 has been prepared by IEC technical committee 10: Fluids
for electrotechnical applications.
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.
A list of all parts in the IEC 62021 series, published under the general title Insulating liquids –
Determination of acidity, can be found on the IEC website.
I.S. EN 62021-3:2014
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.
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 publication using a colour printer.
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I.S. EN 62021-3:2014
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 insulating liquids which are the subject of this standard should be handled with due
regard to personal hygiene. Direct contact with the eyes may cause slight 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 procedures referenced in this standard involve the use of processes that could
lead to a hazardous situation. Attention is drawn to the relevant standard for guidance.
Environment
This standard involves non-mineral insulating oils, chemicals, used sample containers and
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fluid-contaminated solids. 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 the release into the environment of these oils.
I.S. EN 62021-3:2014
1 Scope
This part of IEC 62021 describes two procedures for the determination of the acidity of
unused and used electrical non-mineral insulating oils. Method A is potentiometric titration
and Method B is colourimetric titration.
NOTE 1 In unused and used non-mineral insulating oils, the constituents that may be considered to have acidic
characteristics include organic acids, phenolic compounds, some oxidation products, resins, organometallic salts
and additives.
The method may be used to indicate relative changes that occur in non-mineral insulating oil
during use under oxidizing conditions regardless of the colour or other properties of the
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The acidity can be used in the quality control of unused non-mineral insulating oil.
NOTE 2 The acidity results obtained by potentiometric test method may or may not be numerically the same as
those obtained by colourimetric methods, but they are generally of the same magnitude.
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.
ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results
For the purposes of this document, the following terms and definitions apply.
3.1
acidity
quantity of base, expressed in milligrams of potassium hydroxide per gram of sample,
required to titrate potentiometrically or colourimetrically a test portion in a specified solvent to
the end point
3.2
non-mineral insulating oil
insulating liquid, not derived from petroleum crudes
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