EN 62021-3:2014

Insulating liquids - Determination of acidity - Part 3: Test methods for non mineral insulating oils

IEC 62021-3:2014 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. 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 resulting non-mineral oil. The acidity can be used in the quality control of unused non-mineral insulating oil. As a variety of oxidation products present in used non-mineral insulating oil contribute to acidity and these products vary widely in their corrosion properties, the test cannot be used to predict corrosiveness of non-mineral insulating oil under service conditions.

Isolierflüssigkeiten - Bestimmung des Säuregehaltes - Teil 3: Prüfverfahren für Isolieröle auf Nichtmineralölbasis

Liquides isolants - Détermination de l'acidité - Partie 3: Méthode d'essai pour les huiles non minérales isolantes

L'IEC 62021-3:2014 décrit deux procédures pour la détermination de l'acidité des huiles non minérales isolantes électriques neuves et usagées. La Méthode A est le titrage potentiométrique et la Méthode B est le titrage colorimétrique. La méthode peut être utilisée pour indiquer des modifications relatives qui se produisent dans une huile non minérale isolante pendant son utilisation par oxydation, indépendamment de la couleur ou d'autres propriétés de l'huile non minérale résultante. L'acidité peut être utilisée dans le contrôle de la qualité de l'huile non minérale isolante neuve. Comme divers produits d'oxydation présents dans l'huile non minérale isolante usagée contribuent à l'acidité et comme ces produits varient largement du point de vue de leurs propriétés de corrosion, l'essai ne peut pas être utilisé pour prévoir la corrosivité d'une huile non minérale isolante dans des conditions de service.

Izolacijske tekočine - Ugotavljanje kislosti - 3. del: Metode za preskušanje nemineralnih (sintetičnih) izolacijskih ol j(IEC 62021-3:2014)

Ta del standarda IEC 62021 opisuje dva postopka za ugotavljanje kislosti neuporabljenih in uporabljenih električnih nemineralnih izolacijskih olj. Metoda A je potenciometrična titracija, metoda B pa kolorimetrična titracija.
OPOMBA 1: Pri neuporabljenih in uporabljenih nemineralnih izolacijskih oljih med sestavine, ki naj bi imele kislinske značilnosti, spadajo organske kisline, fenolne spojine, nekateri produkti oksidacije, smole, organokovinske soli in aditivi.
Metoda se lahko uporablja za označevanje povezanih sprememb nemineralnega izolacijskega olja med uporabo pri oksidativnih pogojih, in sicer ne glede na barvo ali druge lastnosti zadevnega nemineralnega olja.
Kislost se lahko uporabi pri kontroli kakovosti neuporabljenih nemineralnih izolacijskih olj. Ker različni produkti oksidacije v uporabljenih nemineralnih izolacijskih oljih prispevajo h kislosti in imajo različne korozivne lastnosti, se preskus ne more uporabiti za napovedovanje korozivnosti nemineralnega izolacijskega olja pri pogojih obratovanja.
OPOMBA 2: Rezultati kislosti, pridobljeni s potenciometrično preskusno metodo, so lahko enaki rezultatom kolorimetričnih metod ali se razlikujejo, vendar so na splošno enakih razsežnosti.

General Information

• Status: Published
• Publication Date: 13-Nov-2014
• Withdrawal Date: 22-Apr-2017
• ICS: 29.040.10 - Insulating oils
• Technical Committee: CLC/SR 10 - Fluids for electrotechnical applications
• Drafting Committee: IEC/TC 10 - IEC_TC_10
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 14-Nov-2014
• Completion Date: 14-Nov-2014
• Ref Project: SIST EN 62021-3:2015 - Insulating liquids - Determination of acidity - Part 3: Test methods for non mineral insulating oils (IEC 62021-3:2014)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2015
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QHPLQHUDOQLKVLQWHWLþQLKL]RODFLMVNLKROM,(&
Insulating liquids - Determination of acidity - Part 3: Test methods for non mineral
insulating oils (IEC 62021-3:2014)
Isolierflüssigkeiten - Bestimmung des Säuregehaltes - Teil 3: Prüfverfahren für Isolieröle
auf Nichtmineralölbasis
Liquides isolants - Détermination de l'acidité - Partie 3: Méthode d'essai pour les huiles
non minérales isolantes
Ta slovenski standard je istoveten z: EN 62021-3:2014
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 62021-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2014
ICS 29.040.10
English Version
Insulating liquids - Determination of acidity - Part 3: Test
methods for non mineral insulating oils
(IEC 62021-3:2014)
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)
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.
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, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62021-3:2014 E
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.
The following dates are fixed:

• latest date by which the document has (dop) 2015-05-14
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-04-23
• latest date by which the national
standards conflicting with the
document have to be withdrawn
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 62021-3:2014 was approved by CENELEC as a European
Standard without any modification.

- 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
titration method
IEC 62021-3 ®
Edition 1.0 2014-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Insulating liquids – Determination of acidity –

Part 3: Test methods for non-mineral insulating oils

Liquides isolants – Détermination de l’acidité –

Partie 3: Méthodes d’essai pour les huiles non minérales isolantes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 29.040.10 ISBN 978-2-8322-1404-6

– 2 – IEC 62021-3:2014 © IEC 2014
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
4.2.7 Glass electrode cleaning solution . 9
4.3 Apparatus . 9
4.3.1 Potentiometric titration apparatus . 9
4.3.2 Glass indicator electrode . 9
4.3.3 Reference electrode . 10
4.3.4 Stirrer . 10
4.3.5 Titration vessel . 10
4.3.6 Titration stand . 10
4.4 Sampling. 10
4.5 Preparation and maintenance of electrode system . 10
4.5.1 Preparation . 10
4.5.2 Maintenance . 10
4.6 Calibration . 11
4.6.1 Calibration of pH titrimeter . 11
4.6.2 Settings for the potentiometric instrument . 11
4.7 Procedure . 12
4.7.1 General . 12
4.7.2 Standardization of alcoholic potassium hydroxide solution . 12
4.7.3 Blank titration . 13
4.7.4 Sample titration . 13
4.8 Calculation of result . 14
4.9 Precision . 14
4.9.1 Repeatability . 14
4.9.2 Reproducibility . 14
4.10 Report. 15
5 Method B: Colourimetric titration. 15
5.1 Principle . 15
5.2 Reagents . 15
5.2.1 General . 15
5.2.2 Titration reagent . 15
5.2.3 Titration solvent . 16
5.2.4 Potassium hydrogen phthalate, primary standard . 16

IEC 62021-3:2014 © IEC 2014 – 3 –
5.2.5 Standard hydrochloric acid solution . 16
5.2.6 Alkali blue 6B indicator solution . 16
5.2.7 Cobalt nitrate solution . 16
5.3 Apparatus . 16
5.3.1 Titration vessel . 16
5.3.2 Stirrer . 16
5.3.3 Burette . 16
5.4 Sampling. 16
5.5 Procedure . 17
5.5.1 General . 17
5.5.2 Standardization of alcoholic potassium hydroxide solution . 17
5.5.3 Blank titration . 17
5.5.4 Sample titration . 18
5.6 Calculation of result . 18
5.7 Precision . 18
5.7.1 Repeatability . 18
5.7.2 Reproducibility . 19
5.8 Report. 19
Annex A (informative) Determination of acidity in non-mineral electrical insulating oils
by photometric titration . 20
A.1 Principle . 20
A.2 Reagents and solvents . 20
A.3 Preparation of titration solutions and solvents . 20
A.3.1 Potassium hydroxide alcoholic solution (0,01 mol/l) . 20
A.3.2 Potassium hydrogen phthalate solution (0,01 mol/l) . 20
A.3.3 Titration solvent . 21
A.4 Apparatus . 21
A.4.1 Volumetric titrator . 21
A.4.2 Titration vessel . 21
A.4.3 Titration stand . 21
A.4.4 Stirrer .
...