Measurement of the average viscometric degree of polymerization of new and aged cellulosic electrically insulating materials

Describes a standardized method for the determination of the average viscometric degree of polymerization (DPv) of new and aged cellulosic electrically insulating materials. It may be applied to all cellulosic insulating materials such as those used in transformer, cable or capacitor manufacturing. The methods described can also be used for the determination of the intrinsic viscosity of solutions of chemically modified kraft papers, provided that these dissolve completely in the selected solvent. Caution should be taken if the method is applied to loaded kraft papers. Note: Within a sample of material, all the cellulose molecules do not have the same degree of polymerization so that the mean value measured by viscometric methods is not necessarily the same as that which may be obtained by, for instance, osmotic or ultra centrifuging methods. Experience has indicated the need for improved description of the experimental method. It describes a revised procedure that overcomes the limitations of the first edition.

Messung des durchschnittlichen viskosimetrischen Polymerisationsgrades von neuen und gealterten cellulosehaltigen Elektroisolierstoffen

Mesure du degré de polymérisation moyen viscosimétrique des matériaux isolants cellulosiques neufs et vieillis à usage électrique

Décrit une méthode normalisée pour déterminer le degré de polymérisation moyen viscosimétrique (DPv) des matériaux isolants cellulosiques neufs et vieillis, à usage électrique. Elle peut s'appliquer à tous les matériaux isolants cellulosiques comme ceux utilisés dans la fabrication des transformateurs, des câbles et des condensateurs. Les méthodes décrites peuvent également être utilisées pour déterminer la viscosité intrinsèque des solutions de papiers kraft modifiés chimiquement, pourvu que ceux-ci se dissolvent totalement dans le solvant choisi. Il convient de prendre des précautions si la méthode s'applique à des papiers kraft chargés. Note: Dans un échantillon de matériau, toutes les molécules de cellulose n'ont pas le même degré de polymérisation de sorte que la valeur moyenne mesurée par les méthodes viscosimétriques n'est pas nécessairement la même que celle obtenue, par exemple, par les méthodes par osmose ou par ultra-centrifugation. L'expérience a mis en évidence le besoin d'améliorer la description de la méthode expérimentale. La procédure ainsi revue permet de surmonter les limitations de la première édition.

Merjenje povprečne viskozimetrične stopnje polimerizacije novih in staranih celuloznih elektroizolacijskih materialov (IEC 60450:2004)

General Information

Status
Published
Publication Date
17-Jun-2004
Withdrawal Date
31-May-2007
Current Stage
6060 - Document made available - Publishing
Start Date
18-Jun-2004
Completion Date
18-Jun-2004

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SLOVENSKI SIST EN 60450:2005

STANDARD
januar 2005
Merjenje povprečne viskozimetrične stopnje polimerizacije novih in staranih
celuloznih elektroizolacijskih materialov (IEC 60450:2004)
(istoveten EN 60450:2004)
Measurement of the average viscometric degree of polymerization of new and aged
cellulosic electrically insulating materials (IEC 60450:2004)
ICS 29.035.01 Referenčna številka
SIST EN 60450:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 60450
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2004

ICS 17.220.99; 29.035.01


English version


Measurement of the average viscometric degree of polymerization
of new and aged cellulosic electrically insulating materials
(IEC 60450:2004)


Mesure du degré de polymérisation Messung des durchschnittlichen
moyen viscométrique des matériaux viskosimetrischen Polymerisationsgrades
isolants cellulosiques neufs et vieillis von neuen und gealterten
à usage électrique cellulosehaltigen Elektroisolierstoffen
(CEI 60450:2004) (IEC 60450:2004)






This European Standard was approved by CENELEC on 2004-06-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60450:2004 E

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EN 60450:2004 - 2 -
Foreword
The text of document 15E/229/FDIS, future edition 2 of IEC 60450, prepared by SC 15E, Methods of
test, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60450 on 2004-06-01.
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) 2005-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-06-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60450:2004 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 60450:2004
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60814 - Insulating liquids - Oil-impregnated paper EN 60814 1997
and pressboard - Determination of water
by automatic coulometric Karl Fischer
titration

1)
ISO 287 - Paper and board - Determination of - -
moisture content - Oven-drying method

1)
ISO 3105 - Glass capillary kinematic viscometers - - -
Specification and operating instructions





1)
Undated reference.
2)
Valid edition at date of issue.

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NORME CEI
INTERNATIONALE
IEC



60450
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

2004-04


Mesure du degré de polymérisation moyen
viscosimétrique des matériaux isolants
cellulosiques neufs et vieillis à usage électrique

Measurement of the average viscometric degre
...

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