Insulating liquids - Test method for detection of potentially corrosive sulphur in used and unused insulating oil

IEC 62535:2008 specifies a test method for detection of potentially corrosive sulphur in used and unused mineral insulating oil. Most recent failures due to corrosive sulphur are related to the formation of copper sulphide deposits in and on the surface of winding cellulosic paper. The test method uses a copper conductor, wrapped with one layer of paper, immersed in the oil and heated to evaluate the capability of the oil to yield copper sulphide and transfer it to paper layers. The growth of copper sulphide on bare copper may cause the presence of conductive particulates in the oil, which can act as nuclei for electrical discharge and may lead to a fault. Other test methods exist using a bare copper strip immersed in oil and heated to detect the corrosive behaviour of oil against copper. ASTM D1275 Method B is also used for this test and a modified procedure using low oil volumes is included in Annex A. Tests with and without paper are considered as complementary and may lead to different results.

Isolierflüssigkeiten - Prüfverfahren für den Nachweis von potenziell korrosivem Schwefel in gebrauchtem und ungebrauchtem Isolieröl

Liquides isolants - Méthode d'essai pour la détection du soufre potentiellement corrosif dans les huiles usagées et neuves

La CEI 62535 :2008 spécifie une méthode d'essai relative à la détection du soufre potentiellement corrosif dans les huiles minérales isolantes usagées et neuves. La plupart des défaillances récentes du fait du soufre corrosif sont liées à la formation de dépôts de sulfure de cuivre dans et à la surface du papier cellulosique de l'enroulement. La méthode d'essai utilise un conducteur en cuivre, recouvert d'une couche de papier, immergé dans l'huile et chauffé pour évaluer la capacité de l'huile à produire du sulfure de cuivre et le transférer sur les couches de papier. La croissance du sulfure de cuivre sur le cuivre nu peut provoquer la présence de particules conductrices dans l'huile, qui peuvent agir comme des noyaux pour la décharge électrique et peuvent conduire à un défaut. D'autres méthodes d'essai qui utilisent une bande de cuivre nu immergée dans l'huile et chauffée existent pour détecter le comportement corrosif de l'huile par rapport au cuivre. La norme ASTM D1275, méthode B est également utilisée pour cet essai et une procédure modifiée utilisant de faibles volumes d'huile est incluse dans l'Annexe A. Des essais avec et sans papier sont considérés comme complémentaires et peuvent conduire à des résultats différents.

Izolacijske tekočine - Preskusne metode za odkrivanje potencialno korozivnega žvepla v rabljenem in nerabljenem izolacijskem olju (IEC 62535:2008)

General Information

Status
Published
Publication Date
13-Jan-2009
Current Stage
6060 - Document made available
Due Date
14-Jan-2009
Completion Date
14-Jan-2009

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SLOVENSKI STANDARD
SIST EN 62535:2009
01-april-2009
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Insulating liquids - Test method for detection of potentially corrosive sulphur in used and

unused insulating oil (IEC 62535:2008)

Isolierflüssigkeiten - Prüfverfahren für den Nachweis von potenziell korrosivem Schwefel

in gebrauchtem und ungebrauchtem Isolieröl (IEC 62535:2008)

Liquides isolants - Méthode d'essai pour la détection du soufre potentiellement corrosif

dans les huiles usagées et neuves (CEI 62535:2008)
Ta slovenski standard je istoveten z: EN 62535:2009
ICS:
29.040.10 Izolacijska olja Insulating oils
SIST EN 62535:2009 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 62535:2009
---------------------- Page: 2 ----------------------
SIST EN 62535:2009
EUROPEAN STANDARD
EN 62535
NORME EUROPÉENNE
January 2009
EUROPÄISCHE NORM
ICS 29.040.10
English version
Insulating liquids -
Test method for detection of potentially corrosive sulphur
in used and unused insulating oil
(IEC 62535:2008)
Liquides isolants - Isolierflüssigkeiten -
Méthode d'essai pour la détection Prüfverfahren für den Nachweis
du soufre potentiellement corrosif von potenziell korrosivem Schwefel in
dans les huiles usagées et neuves gebrauchtem und ungebrauchtem Isolieröl
(CEI 62535:2008) (IEC 62535:2008)

This European Standard was approved by CENELEC on 2008-12-01. 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, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62535:2009 E
---------------------- Page: 3 ----------------------
SIST EN 62535:2009
EN 62535:2009 – 2 –
Foreword

The text of document 10/746/FDIS, future edition 1 of IEC 62535, prepared by IEC TC 10, Fluids for

electrotechnical applications, was submitted to the IEC-CENELEC parallel vote and was approved by

CENELEC as EN 62535 on 2008-12-01.
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) 2009-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-12-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 62535:2008 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 60567 NOTE Harmonized as EN 60567:2005 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 62535:2009
– 3 – EN 62535:2009
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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
- Copper and copper alloys - Copper rod, bar EN 13601 -
and wire for general electrical purposes
IEC 60475 - Method of sampling liquid dielectrics - -
IEC 60554-3-1 - Specification for cellulosic papers for - -
electrical purposes -
Part 3: Specifications for individual
materials - Sheet 1: General purpose
electrical paper
ASTM D1275 - Methods A and B: Standard test method for - -
corrosive sulfur in electrical insulating oils
ASTM D130 - Standard test method for corrosiveness to - -
copper from petroleum products by copper
strip test
DIN 51353 - Testing of insulating oils; detection of - -
corrosive sulfur; silver strip test
Undated reference.
---------------------- Page: 5 ----------------------
SIST EN 62535:2009
---------------------- Page: 6 ----------------------
SIST EN 62535:2009
IEC 62535
Edition 1.0 2008-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

Insulating liquids – Test method for detection of potentially corrosive sulphur in

used and unused insulating oil
Liquides isolants – Méthode d’essai pour la détection du soufre potentiellement
corrosif dans les huiles usagées et neuves
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.040.10 ISBN 2-8318-1004-6
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 62535:2009
– 2 – 62535 © IEC:2008
CONTENTS

FOREWORD...........................................................................................................................3

INTRODUCTION.....................................................................................................................5

1 Scope...............................................................................................................................6

2 Normative references .......................................................................................................6

3 Terms and definitions .......................................................................................................6

4 Sampling ..........................................................................................................................7

5 Procedure ........................................................................................................................7

5.1 Principle..................................................................................................................7

5.2 Apparatus and materials..........................................................................................7

5.3 Method....................................................................................................................8

6 Inspection and interpretation ............................................................................................8

6.1 General ...................................................................................................................8

6.2 Copper ....................................................................................................................9

6.3 Paper ......................................................................................................................9

6.4 Result .....................................................................................................................9

7 Repeatability and reproducibility.......................................................................................9

8 Report ............................................................................................................................10

Annex A (informative) Copper strip method to detect corrosive and potentially

corrosive sulphur in oil..........................................................................................................11

Annex B (informative) Analysis for copper sulphide on insulating paper by scanning

electron microscope-energy dispersive X-ray spectrometry (SEM/EDX) ................................14

Bibliography..........................................................................................................................16

---------------------- Page: 8 ----------------------
SIST EN 62535:2009
62535 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATING LIQUIDS –
TEST METHOD FOR DETECTION OF POTENTIALLY CORROSIVE
SULPHUR IN USED AND UNUSED INSULATING OIL
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 they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

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 62535 has been prepared by IEC technical committee 10: Fluids

for electrotechnical applications.
The text of this standard is based on the following documents:
FDIS Report on voting
10/746/FDIS 10/749/RVD

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.

---------------------- Page: 9 ----------------------
SIST EN 62535:2009
– 4 – 62535 © IEC:2008

The committee has decided that the contents of this publication will remain unchanged until

the maintenance result 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.
---------------------- Page: 10 ----------------------
SIST EN 62535:2009
62535 © IEC:2008 – 5 –
INTRODUCTION

In recent years, several failures of transformers and reactors due to copper sulphide

formation in/on the cellulose insulation have been reported worldwide. The tendency of

transformer oils to form copper sulphide in the presence of copper is seen as one of the major

contributing factors.

The most common reason for such failures is arcing between adjacent disks or conductors of

a winding, due to the formation of deposits of copper sulphide on the cellulosic insulating

paper.

It has been demonstrated that existing test methods for corrosive sulphur, ASTM D1275

method A and DIN 51353, are unable to detect oils having potentially corrosive behaviour.

For this reason, IEC technical committee 10 has prepared this International Standard for the

detection of potentially corrosive sulphur in mineral insulating oils. The wrapped conductor

test method is suitable for used and unused mineral oils.

This test method is based on a study performed by Conseil International des Grands Réseaux

Electriques (CIGRE) working group A2.32 [1] .
Health and safety

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 mineral oils which are the subject of this standard should be handled with due regard to

personal hygiene. Direct contact with 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 tests specified 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 mineral oils, chemicals and used sample containers. The disposal of

these items should be carried out in accordance with current national legislation with regard

to the impact on the environment. Every precaution should be taken to prevent the release

into the environment of mineral oil.
___________
Figures in square brackets refer to the bibliography.
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SIST EN 62535:2009
– 6 – 62535 © IEC:2008
INSULATING LIQUIDS –
TEST METHOD FOR DETECTION OF POTENTIALLY CORROSIVE
SULPHUR IN USED AND UNUSED INSULATING OIL
1 Scope

This International Standard specifies a test method for detection of potentially corrosive

sulphur in used and unused mineral insulating oil.

Most recent failures due to corrosive sulphur are related to the formation of copper sulphide

deposits in and on the surface of winding cellulosic paper.

The test method uses a copper conductor, wrapped with one layer of paper, immersed in the

oil and heated to evaluate the capability of the oil to yield copper sulphide and transfer it to

paper layers.

The growth of copper sulphide on bare copper may cause the presence of conductive

particulates in the oil, which can act as nuclei for electrical discharge and may lead to a fault.

Other test methods exist using a bare copper strip immersed in oil and heated to detect the

corrosive behaviour of oil against copper. ASTM D1275 Method B is also used for this test

and a modified procedure using low oil volumes is included in Annex A.

Tests with and without paper are considered as complementary and may lead to different

results.
2 Normative references

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.
IEC 60475, Method of sampling liquid dielectrics

IEC 60554-3-1, Specification for cellulosic papers for electrical purposes – Part 3:

Specifications for individual materials – Sheet 1: General purpose electrical paper

ASTM D1275, Methods A and B: Standard test method for corrosive sulfur in electrical

insulating oils

ASTM D130, Standard test method for corrosiveness to copper from petroleum products by

copper strip test

DIN 51353, Testing of insulating oils; detection of corrosive sulfur; silver strip test

EN 13601, Copper and copper alloys. Copper rod, bar and wire for general electrical

purposes
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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SIST EN 62535:2009
62535 © IEC:2008 – 7 –
3.1
potentially corrosive sulphur
organo-sulphur compounds present in tra
...

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