BS-6921-1988 IEC-60795-1984.pdf
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1、BRITISH STANDARD BS 6921:1988 IEC 795:1984 Method of Evaluation of the thermal endurance of flexible sheet electrical insulating materials using the wrapped tube method UDC 621.315.216.61:669.3 + 620.193.94.163.3:001.818 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:01:52 GMT+00:00 2006,
2、 Uncontrolled Copy, (c) BSI BS 6921:1988 This British Standard, having been prepared under the direction of the General Electrotechnical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 December 1988 BSI 12-1999 The following BSI refe
3、rences relate to the work on this standard: Committee reference GEL/16 Draft for comment 86/31219 DC ISBN 0 580 16343 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Electrotechnical Engineering Standards Committee (GEL/-) to T
4、echnical Committee GEL/16, upon which the following bodies were represented: Adhesive Tape Manufacturers Association British Ceramic Research Ltd. British Industrial Ceramic Manufacturers Association British Paper and Board Industry Federation (PIF) British Plastics Federation British Telecommunicat
5、ions plc Department of Trade and Industry (National Measurement Accreditation Service) ERA Technology Ltd. Electrical and Electronic Insulation Association (BEAMA Ltd.) Electricity Supply Industry in England and Wales Electronic Engineering Association Ministry of Defence RAPRA Technology Ltd. Rotat
6、ing Electrical Machines Association (BEAMA Ltd.) Telecommunication Engineering and Manufacturing Association (TEMA) Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:01:52
7、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6921:1988 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2General1 3Preparation of test specimens1 4Heating of specimens1 5Conditioning2 6Measurement of breakdown voltage2 7Procedure2 Table 1 Suggested ex
8、posure temperatures and cycle durations2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:01:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6921:1988 ii BSI 12-1999 National foreword BS 6921 has been prepared under the direction of the General Ele
9、ctrotechnical Engineering Standards Committee. It is identical with IEC 795:1984 “Test method for evaluating thermal endurance of flexible sheet materials using the wrapped tube method”, published by the International Electrotechnical Commission (IEC). Terminology and conventions. The text of the In
10、ternational Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards. The Technical Committee has reviewed the provisions of IEC 243 (19671)2), to which reference is
11、 made in the text, and has decided that they are acceptable for use in conjunction with this standard. Related British Standards to IEC 243:1967 are BS 2918:1957 (Obsolescent), BS 2782:Methods 220 and 221:1983 and BS 903-C4:1983. There are no British Standards relating to the subjects covered by IEC
12、 216-33)and IEC 216-43). The Technical Committee has reviewed the provisions of these two standards and has decided that they are acceptable for use in conjunction with this standard. IEC 216 is under revision and will be published in five Parts. The first, IEC 216-1, 3rd edition, was published in S
13、eptember 1987. There will be no revision of BS 5691 until all Parts of IEC 216, 3rd edition, have been published. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Bri
14、tish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendment
15、s incorporated. This will be indicated in the amendment table on the inside front cover. Cross-references International Standard1) Corresponding British Standard IEC 216BS 5691 Guide for the determination of the thermal endurance properties of electrical insulating materials IEC 216-13) Part 1:1979
16、General procedures for the determination of thermal endurance properties, temperature indices and thermal endurance profiles (Identical) IEC 216-23) Part 2:1979 List of materials and available tests (Identical) 1) Undated in the text. 2) IEC 243 is currently under revision. 3) Referred to under the
17、generic number IEC 216. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:01:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6921:1988 BSI 12-19991 1 Scope This test method is for the evaluation of the thermal endurance of flexible sheet materials used for electrical insulation. 2 General T
18、his method follows the guidance given in the following IEC publications: Publication 216, Guide for the Determination of Thermal Endurance Properties of Electrical Insulating Materials. Publication 243, Recommended Methods of Test for Electric Strength of Solid Insulating Materials at Power Frequenc
19、ies. This method, with modifications such as the use of enamelled winding wire instead of aluminium foil for the electrodes, or the application of varnish, may be useful for compatibility testing. 3 Preparation of test specimens Take 27 copper tubes4), each at least 310 mm long and polish with grade
20、 00 carborundum paper to a finished outer diameter of 15 0.2 mm. The polished surface shall be free from defects visible to the naked eye. Remove the metal and carborundum dust by wiping the tubes and finally clean with a non-flammable low toxicity solvent of high volatility such as 1,1,1-trichloroe
21、thane. An additional set of specimens may be prepared for testing at any other temperature, if required. Cut sheets, each of width 65 1 mm and length 5 mm less than that of the copper tube, from the specimen under test so that the longer dimension is at right angles to the length of the material. Wr
22、ap a sheet around each cleaned tube to give a single wrap with about 18 mm overlap. Wind ten equally spaced electrodes, each consisting of four fully overlapping turns of clean aluminium foil 13 0.5 mm wide by 0.1 0.025 mm thick on the tube. Secure the outer end of each aluminium strip with the mini
23、mum quantity of an adhesive5). Finally, secure the electrodes by a wrap of heat cleaned fibre glass tape6)12 mm to 15 mm wide by 0.06 mm to 0.08 mm thick. Wrap the tape with about 3 mm overlap, but leave gaps to give access to the electrodes. Throughout assembly the cleaned tubes, test specimens, cl
24、ean aluminium and glass tape shall not be touched with bare hands or otherwise contaminated. Clean polythene or rubber gloves may be used. Identify each tube by means of a wired-on tag or by other means. Adjust the temperature of each oven to each of three exposure temperatures selected from those i
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