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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Isolierflüssigkeiten - Prüfverfahren zur Bestimmung der Grenzflächenspannung von Isolierflüssigkeiten - Bestimmung der Grenzflächenspannung mittels RingmethodeIsolants liquides - Méthodes d'essai pour la détermination de la tension interfaciale des isolants liquides - Détermination par la méthode à l'anneauInsulating liquids - Test methods for the determination of interfacial tension of insulating liquids - Determination with the ring method29.040.01Izolacijski fluidi na splošnoInsulating fluids in generalICS:Ta slovenski standard je istoveten z:EN IEC 62961:2018SIST EN IEC 62961:2019en01-januar-2019SIST EN IEC 62961:2019SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 62961
November 2018 ICS 29.040.10
English Version
Insulating liquids - Test methods for the determination of interfacial tension of insulating liquids - Determination with the ring method (IEC 62961:2018)
Isolants liquides - Méthodes d'essai pour la détermination de la tension interfaciale des isolants liquides - Détermination par la méthode à l'anneau (IEC 62961:2018)
Isolierflüssigkeiten - Prüfverfahren zur Bestimmung der Grenzflächenspannung von Isolierflüssigkeiten - Bestimmung der Grenzflächenspannung mittels Ringmethode (IEC 62961:2018) This European Standard was approved by CENELEC on 2018-10-25. 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 62961:2018 E SIST EN IEC 62961:2019
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 62961:2018 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 60422 NOTE Harmonized as EN 60422
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 ISO 862 -
Surface active agents - Vocabulary
-
-
ISO 3675 -
Crude petroleum and liquid petroleum products - Laboratory determination of density - Hydrometer method
EN ISO 3675 -
ISO 12185 -
Crude petroleum and petroleum products - Determination of density - Oscillating U-tube method
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-
EN 14370 -
Surface active agents - Determination of surface tension
EN 14370 -
IEC 62961 Edition 1.0 2018-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Insulating liquids – Test methods for the determination of interfacial tension of insulating liquids – Determination with the ring method
Isolants liquides – Méthodes d'essai pour la détermination de la tension interfaciale des isolants liquides – Détermination par la méthode à l'anneau
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 29.040.10
ISBN 978-2-8322-6037-1
– 2 – IEC 62961:2018 IEC 2018 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 8 2 Normative references . 8 3 Terms and definitions . 8 4 Principle . 8 5 Apparatus . 9 5.1 Tensiometer . 9 5.2 Ring . 10 5.3 Measuring vessel . 10 6 Preparation of apparatus . 10 6.1 Cleaning of the measuring vessel . 10 6.2 Cleaning of the ring . 11 6.3 Water used for the test. 11 7 Procedure . 11 7.1 General . 11 7.2 Calibration and taring . 11 7.3 Determination of the surface tension of water used for the test . 12 7.4 Determination of interfacial tension between water and insulating liquid. 12 8 Test report . 12 9 Precision . 13 9.1 Repeatability . 13 9.2 Reproducibility . 13 Annex A (informative)
Determination of the interfacial tension of insulation
liquids by the drop volume method . 14 A.1 General . 14 A.2 Principle of the method . 14 A.2.1 Basics . 14 A.2.2 Effect of adsorption (surface age) on the values obtained . 15 A.3 Apparatus . 15 A.4 Procedure . 15 A.4.1 Preparation of apparatus . 15 A.4.2 Calibration . 15 A.4.3 Preparation of the test sample . 15 A.4.4 Determination . 16 A.4.5 Evaluation/expression of results . 16 A.4.6 Correlation of results obtained with drop volume method to results obtained with ring method . 16 A.5 Precision . 17 A.6 Test report . 17 Annex B (informative)
Investigative tests for differentiating
between aged insulating liquids . 18 B.1 General . 18 B.2 Application . 19 Bibliography . 20
IEC 62961:2018 IEC 2018 – 3 –
Figure 1 – Typical development of interfacial tension values of new and service aged mineral insulating liquids . 6 Figure 2 – Typical development of interfacial tension values
of a new and a service aged ester insulating liquid . 7 Figure 3 – Dimensions of platinum-iridium alloy ring in mm . 10 Figure B.1 – Plot of the data from Table B.1
according to Kezdy-Swinbourne method . 19
Table 1 – Repeatability (r) as a % for the measurement of interfacial tension at approximately 180 s with both manual and motor driven instruments . 13 Table 2 – Reproducibility (R) as a % for the measurement of interfacial tension at approximately 180 s with both manual and motor driven instruments . 13 Table A.1 – Comparison of interfacial values by measurement at 180 s
and at 300 s to 400 s between the drop volume and ring methods . 17 Table B.1 – Interfacial tension measured in constant equal time intervals . 18 Table B.2 – Comparison of interfacial tension values by measurement
at 180 s with equilibrium values according to Kezdy-Swinbourne method . 19
– 4 – IEC 62961:2018 IEC 2018 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
INSULATING LIQUIDS – TEST METHODS FOR
THE DETERMINATION OF INTERFACIAL TENSION OF INSULATING LIQUIDS – DETERMINATION WITH THE RING METHOD
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 th
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