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1、 TECHNICAL REPORT IEC CEI RAPPORT TECHNIQUE TR 62036 First edition Premire dition 2007-04 Mineral insulating oils Oxidation stability test method based on differential scanning calorimetry (DSC) Huiles minrales isolantes Mthode dessai pour valuer la stabilit doxydation fonde sur lanalyse calorimtriq
2、ue diffrentielle par balayage Reference number Numro de rfrence IEC/CEI/TR 62036:2007 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTNo reproduction or networking pe
3、rmitted without license from IHS -,-,- THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopy
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15、s, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTN
16、o reproduction or networking permitted without license from IHS -,-,- TECHNICAL REPORT IEC CEI RAPPORT TECHNIQUE TR 62036 First edition Premire dition 2007-04 Mineral insulating oils Oxidation stability test method based on differential scanning calorimetry (DSC) Huiles minrales isolantes Mthode des
17、sai pour valuer la stabilit doxydation fonde sur lanalyse calorimtrique diffrentielle par balayage PRICE CODE CODE PRIX M For price, see current catalogue Pour prix, voir catalogue en vigueur Commission Electrotechnique Internationale International Electrotechnical Commission Copyright International
18、 Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 TR 62036 IEC:2007 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Gen
19、eral remarks.6 3 Effect of temperature on oxidation induction time .6 3.1 Isothermal .6 3.2 Temperature-programmed runs .7 4 Effect of sample size on oxidation induction time7 4.1 Inhibited oil .7 4.2 Uninhibited oil .7 5 Other factors effecting oxidation induction time 8 6 Reliability of method.8 7
20、 Different instruments 8 8 Interpretation of curves.9 9 Conclusion .9 Bibliography13 Table 1 Oxidation induction time of oil samples at different temperature programmes10 Table 2 Oxidation induction time of oil samples at different sample weight.10 Table 3 Repeatability of oxidation induction time b
21、y PDSC 10 Table 4 Reproducibility of oxidation induction time by PDSC11 Table 5a DSC Results analyzed at different laboratories Uninhibited oil12 Table 5b DSC Results analyzed at different laboratories Inhibited oil12 Copyright International Electrotechnical Commission Provided by IHS under license
22、with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTNo reproduction or networking permitted without license from IHS -,-,- TR 62036 IEC:2007 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MINERAL INSULATING OILS OXIDATION STABILITY TEST METHOD BASED ON
23、DIFFERENTIAL SCANNING CALORIMETRY (DSC) 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 que
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34、fferent kind from that which is normally published as an International Standard, for example “state of the art“. IEC 62036, which is a technical report, has been prepared by IEC technical committee 10: Fluids for electrotechnical applications. Copyright International Electrotechnical Commission Prov
35、ided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 TR 62036 IEC:2007 The text of this technical report is based on the following documents: Enquiry draf
36、t Report on voting 10/676/DTR 10/690/RVC Full information on the voting for the approval of this technical report 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. The committee has decided that the
37、 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.
38、Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTNo reproduction or networking permitted without license from IHS -,-,- TR 62036 IEC:2007 5 INTRODUCTION The existing m
39、ethods to assess oxidation stability of mineral insulating oil are very time consuming. A faster method is necessary for effective quality control and status monitoring. Differential scanning calorimetry (DSC) as a technique has been used for monitoring grease and lubricants oxidation stability. The
40、 use of DSC for evaluation of oil oxidation stability was originally suggested to IEC, TC 10 following publication of a literature review of DSC oxidation tests performed on petroleum products (10/367/INF April 1996). During IECs TC 10 meeting in Geneva, 1998, it was decided to set up a working grou
41、p for development of a standard based on DSC for rapid evaluation of mineral insulating oil oxidation stability. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/17/2007 02:58:20 MDTNo re
42、production or networking permitted without license from IHS -,-,- 6 TR 62036 IEC:2007 MINERAL INSULATING OILS OXIDATION STABILITY TEST METHOD BASED ON DIFFERENTIAL SCANNING CALORIMETRY (DSC) 1 Scope The purpose of IEC 62036, which is a technical report, is to develop a rapid oxidation stability test
43、 method based on differential scanning calorimetry (DSC) to assess the oxidation stability of mineral insulating oils. 2 General remarks The main function of insulating oil is insulation and cooling. The expected life span of transformer oil is 25 to 40 years, largely depending on operating temperat
44、ure and electrical load. Specifications are prepared and used to fulfil all criteria required for proper functioning of the oil in service. Life expectancy from insulating oil has a large economic impact on the cost of operation of a unit. The oxidation stability test is an important test as this wi
45、ll evaluate, to some extent, the life of the oil in service. Resistance of an oil oxidation is very much dependant on the refining process and type of crude oil. Both under-refined and over-refined oils may exhibit poor oxidation stability. The complex process of oxidation of in-service oils occurs
46、slowly at the normal operating temperature of the transformer and is dependant on temperature, oxygen and catalyst. In the first stage of oil oxidation, radicals and peroxides are produced. These compounds are unstable and rapidly convert to volatile and soluble acids and finally producing insoluble
47、 material or sludge. All of these products have an adverse effect on electrical and physical properties of oil. The oil may reach a stage where it is not fit for its intended purpose. To establish a long service life for the oil, an oxidation stability test is performed on the unused oil. There are
48、several standard test methods for evaluation of the oxidation stability of transformer oil. The recommended international test method is IEC 61125. This test involves oxidizing the oil at 120 C for 164 h and then measuring the acidity, sludge and dielectric dissipation factor (DDF). Other national test methods are based on the same principal and are time consumi