BS-7819-1995 IEC-61026-1991.pdf
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1、BRITISH STANDARD BS 7819:1995 IEC 1026:1991 Guidelines for application of analytical test methods for thermal endurance testing of electrical insulating materials Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
2、 BS 7819:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1995 BSI 10-1999 The following BSI references relate to the work on this standard: Committee
3、 reference GEL/15 Draft announced in BSI News April 1995 ISBN 0 580 24431 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/15, Insulating material, to Subcommittee GEL/15/2, Endurance Tests, upon which the following
4、bodies were represented: AEA Technology Adhesive Tape Manufacturers Association Association of Manufacturers of Domestic Electrical Appliances British Cable Makers Confederation British Plastics Federation ERA Technology Ltd. University of Manchester Amendments issued since publication Amd. No.DateC
5、omments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7819:1995 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Introduction1 Section 1. General aspects 1Scope and o
6、bject2 2General principles2 3Analytical methods for reaction rate measurements2 Section 2. Test procedure A, Single reaction case 4Range of application for procedure A4 5Reaction rate measurements in procedure A5 6Conventional ageing tests in procedure A5 7Evaluation in procedure A6 8Reporting in pr
7、ocedure A6 Section 3. Test procedure B, Multi-reaction case 9Range of application for procedure B7 10Reaction rate measurements in procedure B8 11Calculations in procedure B9 12Conventional ageing tests in procedure B11 13Evaluation in procedure B11 14Reporting in procedure B12 Section 4. Test proce
8、dure C, Multi-reaction with diffusion 15Range of application for procedure C13 16Reaction rate measurements in procedure C13 17Calculations in procedure C14 18Conventional ageing tests in procedure C15 19Evaluation in procedure C15 20Reporting in procedure C15 Appendix A Presentation of the theoreti
9、cal principles of test procedures B and C17 Appendix B References17 Figure 1 Example of an arrangement for reaction rate measurement in procedure A18 Figure 2 Example of a test arrangement for reaction rate measurements for procedure A, B or C, using IDC19 Figure 3 Evaluation of test results in proc
10、edure A20 Figure 4 Procedure B or C: Evaluation of test results21 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7819:1995 ii BSI 10-1999 National foreword This British S
11、tandard has been prepared by Technical Committee GEL/15. It is identical with IEC 1026:1991, Guidelines for application of analytical test methods for thermal endurance testing of electrical insulating materials, published by the International Electrotechnical Commission (IEC). A British Standard do
12、es not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British
13、Standard IEC 216 (series)BS 5691 (series) Guide for the determination of thermal endurance properties of electrical insulating materials Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 22, an inside back cover and a back cover. This standard
14、has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7819:1
15、995 BSI 10-19991 Introduction Analytical methods have been applied to investigations of ageing processes in electrical insulating materials and to the measurement of ageing reaction rates for more than 25 years. The reference list attached to this report is limited to investigations where sensitive
16、analytical methods have been applied for reaction rate measurements down to the application temperature range of materials. The first investigators 1,21) used gas chromatography or mass spectrometry as analytical methods in a way from which procedure A of this report could be developed, together wit
17、h several later published results 5, 7, 10, 11. Later investigators used a new analytical instrument, the isothermal differential calorimeter 4, which, together with theoretical developments 9 and other publications 6, 12, 13, 14 is the basis of procedures B and C of this report. Other investigators
18、 have concentrated on the use of rapid analytical techniques (such as thermogravimetric analysis TGA and differential thermoanalysis DTA), and on the derivation of an estimate of thermal endurance solely on the basis of these measurements. While these methods may be valuable tools when developing ne
19、w polymers or selecting materials for long-term thermal endurance testing, they do not belong to the scope of this report, since these methods lead to extrapolation of test results over a large temperature span, which may lead to erroneous conclusions. There is thus sufficient knowledge gathered in
20、this field to prepare detailed procedures to be published as an IEC Report, in order to pave the way for the later standardization of the method. This report is also intended to stimulate further work on the application of analytical methods for thermal endurance testing of insulating materials. Thi
21、s report is based on the following principles: 1) The analytical methods used must be sensitive enough to enable measurements of ageing reaction rates down to the application temperatures of the materials. 2) Several analytical methods have been shown to be suitable for reaction rate measurements an
22、d to produce similar information about reaction rates. Therefore, the test procedures allow the use of several analytical methods. 3) Measurements of the ageing reaction rates serve the purpose of determining the rate of the ageing process (or of separate reactions), producing information e.g. about
23、 the slope of the thermal endurance graph. 4) Reaction rate values alone cannot be used to totally describe the thermal endurance of materials. They must be combined with ageing tests of the conventional type to produce actual thermal endurance values in the same form as IEC Publication 216. 5) The
24、goal of analytical reaction rate measurements is to ensure the same physicochemical ageing mechanism in the conventional ageing tests as at application temperatures, but at a much higher rate. 6) There are materials with ageing processes of different complexity. The test procedures should be either
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