1、BRITISH STANDARD BS 5689-3.1: 1996 IEC 394-3-1: 1976 Varnished fabrics for electrical purposes Part 3: Specifications for individual materials Section 3.1 Oleoresinous varnish cotton base, OR/CBS5689-3.1:1996 This British Standard, having been prepared under the directionof the Electrotechnical Sect
2、or Board, was published underthe authority of the Standards Board and comes intoeffect on 15January1996 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference GEL/15/3/10 Draft announced in BSINews April 1995 ISBN 0 580 25012 1 Committees responsible for th
3、is British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/15, Insulating material, to Subcommittee GEL/15/3/10, Flexible composites and textiles, upon which the following bodies were represented: British Narrow Fabrics Association Covered Conductors Associ
4、ation ERA Technology Ltd. Electrical and Electronic Insulation Association (BEAMA Ltd.) Federation of the Electronics Industry Amendments issued since publication Amd. No. Date CommentsBS5689-3.1:1996 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Introduc
5、tion 1 1 General requirements 1 3 Resistance against hydrolysis 1 4 Effect of fabric on oil 1 5 Effect of oil on varnished fabric 1 6 Tensile strength and elongation 1 7 Internal tearing resistance 1 8 Edge tearing resistance 1 9 Electric strength 1 10 Thermal endurance requirements 1 Table I Tensil
6、e strength 2 Table II Elongation at break 2 Table III Internal tearing resistance 2 Table IV Electric strength 2 List of references Inside back coverBS5689-3.1:1996 ii BSI 08-1999 National foreword This Section of BS5689 has been prepared by Subcommittee GEL/15/3/10. It is identical with IEC394-3-1:
7、1976 Varnished fabrics for electrical purposes Part3: Specifications for individual materials Sheet 1: Oleoresinous varnish cotton base, OR/C, published by the International Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract.
8、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 International standard Corresponding British Standard BS 5689 Varnished fabrics for electrical purposes IEC 394-1 P
9、art 1:1979 Definitions and general requirements IEC 394-2 Part 2:1979 Methods of test Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have h
10、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5689-3.1:1996 BSI 08-1999 1 Introduction This standard is one of a series that includes varnished fabrics comprising bases woven from cotton, natural silk, or synthetic fibres (including glass) supp
11、lied in the form of full-width rolls, sheets or tapes slit to various widths. The series includes three parts describing: 1) Definitions and general requirements; 2) Methods of test; 3) Specifications for individual materials. SHEET 1 Requirements for varnished fabrics, oleoresinous varnish cotton b
12、ase, OR/C 1 General requirements The material shall conform to the requirements published in Part1 1)of this standard. The numbering of the following clauses corresponds with that of the clauses of Part2 2)of this standard. 3 Resistance against hydrolysis The application of this requirement is the s
13、ubject of prior agreement between purchaser and supplier, depending on the purpose for which the material is intended. When tested according to the method published in Part2, the material shall show no failure after24h. 4 Effect of fabric on oil The application of this requirement is the subject of
14、prior agreement between purchaser and supplier, depending on the purpose for which the material is intended. When tested according to the method published inPart2, the acid number shall be not greater than1.0. 5 Effect of oil on varnished fabric The application of this requirement is the subject of
15、prior agreement between purchaser and supplier, depending on the purpose for which the material is intended. When tested according to the method published in Part2, no failures shall occur. 6 Tensile strength and elongation When tested according to the method published in Part2, the tensile strength
16、 of the material shall be not less than the values given inTable I. The requirements for the stresses giving an elongation of6% or10% shall be the subject of agreement between purchaser and supplier. The elongation at break of the material when determined according to the method published in Part2 s
17、hall be not less than the values given inTable II. 7 Internal tearing resistance The internal tearing strength of the material as received, when determined according to the method published in Part2, shall be not less than the values given inTable III (under consideration). When determined according
18、 to the method published in Part2, the tearing resistance of the material after heating in air at an oven temperature of105 C shall show a decrease between the values after 1h and after48h not exceeding25% of the value after1h. 8 Edge tearing resistance This requirement shall be the subject of a pri
19、or agreement between purchaser and supplier. 9 Electric strength 9.3.1 Electric strength at room temperature When tested according to the method published in Part2, the electric strength at room temperature shall be not less than the values given inTable IV. 9.3.2 Electric strength at 105 C When tes
20、ted according to the method published in Part2, the electric strength at105 C shall be not less than the values given inTable IV. 9.3.3 Electric strength of extended material Under consideration. 10 Thermal endurance requirements Under consideration. 1) IEC Publication 394-1: Varnished Fabrics for E
21、lectrical Purposes, Part 1: Definitions and General Requirements. 2) IEC Publication 394-2: Part 2: Methods of Test.BS5689-3.1:1996 2 BSI 08-1999 Table I Tensile strength Table II Elongation at break Table III Internal tearing resistance (under consideration) Table IV Electric strength NOTEThe value
22、s relate to fabrics with normal thickness of varnish. Some countries use lower thicknesses and the values may then need to be reduced. Nominal thickness in millimetres Tensile strength in newtons per 10 mm width Straight-cut Bias-cut Warp Weft Normal Joins 0.10 0.12 0.15 0.20 0.25 0.30 30 45 60 70 8
23、0 90 30 40 45 45 50 50 30 30 35 45 50 55 20 20 30 35 40 50 Nominal thickness in millimetres Elongation at break in per cent straight-cut Bias-cut 0.10 0.12 0.15 0.20 0.25 0.30 3 3 3 3 3 3 15 15 15 20 20 20 Nominal thickness in millimetres Breakdown voltage in volts At room temperature At 105 C 0.10
24、0.12 0.15 0.20 0.25 0.30 4000 5000 6000 7000 9000 10000 2500 3000 4000 5000 6000 7000BS5689-3.1:1996 BSI 08-1999 List of references See national foreword.BS 5689-3.1: 1996 IEC 394-3-1: 1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body r
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