1、 IEC 62535Edition 1.0 2008-10INTERNATIONAL STANDARD NORME INTERNATIONALEInsulating liquids Test method for detection of potentially corrosive sulphur in used and unused insulating oil Liquides isolants Mthode dessai pour la dtection du soufre potentiellement corrosif dans les huiles usages et neuves
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16、u Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62535Edition 1.0 2008-10INTERNATIONAL STANDARD NORME INTERNATIONALEInsulating liquids Test method for detection of potentially corrosive sulphur in used and unused insulating oil Liquides isolants M
17、thode dessai pour la dtection du soufre potentiellement corrosif dans les huiles usages et neuves INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PICS 29.040.10 PRICE CODECODE PRIXISBN 2-8318-1004-6 Registered trademark of the International Electrotechnical Commi
18、ssion Marque dpose de la Commission Electrotechnique Internationale 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 Principle7 5.2 Apparatus and materials7 5.3 Method8 6 Inspection and interpretation 8
19、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 oil11 Annex B (informative) Analysis for copper sulphide on insulating paper by scanning electron
20、 microscope-energy dispersive X-ray spectrometry (SEM/EDX) 14 Bibliography16 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 Com
21、mission (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
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24、nce 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 inter
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27、etween 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
28、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
29、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 publicatio
30、n. 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 pa
31、tent 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
32、 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. 4 62535 IEC:2008 The committee has decided that the contents of this publication will remain unchanged until the maintenance result date i
33、ndicated 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. 62535 IEC:2008 5 INTRODUCTION In recent years, several failures of transformers and rea
34、ctors 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
35、 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. F
36、or 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
37、 International des Grands Rseaux Electriques (CIGRE) working group A2.32 11. 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 prac
38、tices 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 quant
39、ities 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,
40、 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. _ 1Figures in square bra
41、ckets refer to the bibliography. 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 insu
42、lating 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
43、 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 i
44、mmersed 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 N
45、ormative 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
46、 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, Sta
47、ndard 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
48、the purposes of this document, the following terms and definitions apply. 62535 IEC:2008 7 3.1 potentially corrosive sulphur organo-sulphur compounds present in transformer oils that may cause copper sulphide formation. NOTE Some of these compounds may be initially corrosive, or become corrosive und
49、er certain operating conditions 4 Sampling Samples shall be taken, following the procedure given in IEC 60475. Ensure that the test portion is representative by thoroughly mixing. 5 Procedure 5.1 Principle A piece of copper conductor wrapped with Kraft paper is immersed in the oil and subjected to heating for 72 h at 150 C in a sealed glass headspace vial. The copper is examined for indications of discolourat
