1、BRITISH STANDARD BS 5626-3.5: 1995 IEC 554-3-5: 1984 Cellulosic papers for electrical purposes Part 3: Specifications for individual materials Section 3.5 Special papersBS5626-3.5:1995 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published
2、underthe authority of the Standards Board and comesintoeffect on 15November1995 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference GEL/15/3/9 Draft announced in BSI News April 1995 ISBN 0 580 24567 5 Committees responsible for this British Standard The
3、preparation of this British Standard was entrusted by Technical Committee GEL/15, Insulating material, to Subcommittee GEL/15/3/9, Paperboard and pressboard, upon which the following bodies were represented: BEAMA Capacitor Manufacturers Association Covered Conductors Association Diamond Fibre Co. L
4、imited ERA Technology Ltd. Paper Federation of Great Britain Royal Society of Chemistry Amendments issued since publication Amd. No. Date CommentsBS5626-3.5:1995 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Introduction 1 1 Scope 1 2 Designation 1 3 Requ
5、irements 1 4 Description of types 1 5 Special paper Class 5A 2 6 Special paper Class 5B 6 7 Special paper Class 5C 10 8 Special paper Class 5D 12 Table 5A.1 Description for Class 5A papers 2 Table 5A.2 Requirements for Class 5A papers 3 Table 5B.1 Descriptions for Class 5B papers 6 Table 5B.2 Requir
6、ements for Class 5B papers 7 Table 5C.1 Descriptions for Class 5C papers 10 Table 5C.2 Requirements for Class 5C papers 10 Table 5D.1 Descriptions for Class 5D papers 12 Table 5D.2 Requirements for Class 5D papers 13 List of references Inside back coverBS5626-3.5:1995 ii BSI 12-1999 National forewor
7、d This British Standard has been prepared by Subcommittee GEL/15/3/9. It is identical with IEC 554-3-5:1984 Specification for cellulosic papers for electrical purposes Part 3: Specifications for individual materials Sheet 5. Special papers, published by the International Electrotechnical Commission
8、(IEC). 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 British Standard does not of itself confer immunity from legal obligations. Cross-references International Sta
9、ndard Corresponding British Standard IEC 554-1:1977 BS 5626 Cellulosic papers for electrical purposes Part 1:1979 Definitions and general requirements IEC 554-2:1977 Part 2:1979 Methods of test IEC 554-3-1:1979 Part 3 Specifications for individual materials Section 3.1:1981 General purpose paper ISO
10、 186:1994 BS 3430:1995 Method for sampling to determine the average quality of paper and board Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and ma
11、y have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5626-3.5:1995 BSI 12-1999 1 Introduction This standard is one of a series which deals with insulating cellulosic papers. The series consists of three parts: Part 1: Definitions and General R
12、equirements (IEC Publication 554-1); Part 2: Methods of Test (IEC Publication 554-2); Part 3: Specifications for Individual Materials. Sheet 1: General Purpose Electrical Paper, Sheet 2: Capacitor Paper, Sheet 3: Crpe Paper, and Sheet 4: Electrolytic Capacitor Paper, have already been published. She
13、et 5. Class 5: Special papers 1 Scope This sheet contains the requirements for special papers such as, for example, those that may be used for cables, transformers and conductor wrapping. These papers are particular papers of Class 1 of IEC Publication554-3-1, Part3: Specifications for Individual Ma
14、terials, Sheet1: General Purpose Electrical Paper, with requirements for specific applications. NOTEThe examples of use given above indicate three main applications for these papers but do not in any way imply a restriction to such uses. Papers of any other class may be employed for such application
15、s when appropriate. 2 Designation Different types of special paper covered by this sheet are designated by the addition of type designating letters, A, B, C, etc., to the class designation, for example 5A. These special papers are further subdivided to take account of differing densities, purities,
16、and air permeabilities, in a manner similar to that used for Class1. The details are contained inTable 5A.1, Table 5B.1, Table 5C.1 and Table 5D.1. 3 Requirements 3.1 General The paper shall comply with the general requirements given in IEC Publication554-1, Part1: Definitions and General Requiremen
17、ts. 3.2 Sampling The sampling procedures shall be as given in ISO Standard 186: Paper and Board Sampling for Testing 3.3 Testing When tested by the methods stipulated, listed inTable 5A.2, Table 5B.2, Table 5C.2 and Table 5D.2 as appropriate, the paper shall comply with the relevant requirements. 3.
18、4 Any dyes used for colouring shall remain discernible after drying and/or impregnating and shall be compatible with the impregnant. 4 Description of types Type 5A The 5A paper is a Class 1 kraft paper for users requiring a particularly high purity. Compared with the requirements of Sheet 1, interva
19、ls and air permeability values are more closely defined, the tensile strength increased and the heat stability defined more precisely. Type 5B The 5B paper is a Class1 paper for users requiring high purity; compared with Sheet1, intervals and air permeability values are more closely defined, the ten
20、sile strength increased and the heat stability defined more precisely. Type 5C The 5C paper is a Class1 paper for users requiring normal purity and medium or high air permeability and restricted water absorption.BS5626-3.5:1995 2 BSI 12-1999 Type 5D The 5D paper is a Class1 paper for users requiring
21、 a medium purity with increased machine direction orientation of the fibres. 5 Special paper Class 5A The descriptions are given inTable 5A.1, the requirements inTable 5A.2. Table 5A.1 Descriptions for Class 5A papers Class Type Description Further description Conductivity of aqueous extract Air per
22、meability (mS/m) (4m/Pas) Symbol Description Symbol Description 5A 5A1 Kraft insulating paper of apparent density u 0.75g/cm 3 1 u 4 L1 L2 L3 L4 M1 M2 M3 H1 H2 H3 H4 H5 u 0.005 0.005tou 0.01 0.01tou 0.02 0.02tou 0.05 0.05tou 0.1 0.1tou 0.2 0.2tou 0.5 0.5tou 1.0 1.0tou 2.0 2.0tou 5.0 5.0tou 8.0 8.0 5
23、A2 Kraft insulating paper of apparent density 0.75tou 0.85 g/cm 3 5A3 Kraft insulating paper of apparent density 0.85tou 0.95 g/cm 3 5A4 Kraft insulating paper of apparent density 0.95g/cm 3 Example: 5A1-1L3 signifies: a paper of nominal apparent densityu 0.75g/cm 3 , conductivity u 4 mS/m and nomin
24、al air permeability 0.01tou 0.024m/Pa.s. BS5626-3.5:1995 BSI 12-1999 3 Table 5A.2 Requirements for Class 5A papers Property Test method in Part 2 (Clause) Unit Requirements Remarks Thickness a 2 4m Tolerance on nominal thickness By agreement between supplier and purchaser more than one layer may be
25、used for measurements; otherwise in accordance with ISO Standard438: Paper Determination of Bulking Thickness and Apparent Density (pressure100 10kPa) Thickness 4m Tolerance u 75 75tou 105 105tou 125 125 10% 7% 6% 4% Substance (grammage) a 3 g/m 2 Tolerance on nominal substance Substance g/m 2 Toler
26、ance u 45 45 10% 5% Apparent density a 4 g/cm 3 Tolerance of 0.05 g/cm 3on the nominal value Tensile strength expressed as tensile index 5 Nm/g Air permeability class Machine direction (minimum) Cross- direction (minimum) To calculate tensile strength use the expression: where: X = tensile strength
27、(kN/m) Y = tensile index (N.m/g) W = substance (g/m 2 ) L M H1-H2 H3-H5 98 93 93 88 37 35 34 34 Elongation at break 5 % Machine direction: 2.0 min. Cross-direction:4.0min. Internal tearing resistance expressed as tear index 6 Minimum values Substance g/m 2 Machine direction Cross- direction 30tou 80
28、 80tou 120 120 5.0 6.0 8.0 6.0 7.0 9.0 Moisture content 10 % Maximum 8.0 Ash 11 % Maximum 0.5 Conductivity of aqueous extract 12 mS/m Maximum 4.0 pH of aqueous extract 13 6.0 to 8.0 Air permeability 18 4m/Pa.s When a value of air permeability is specified by the purchaser, the air permeability shall
29、 not deviate from this value by more than 33%. When a purchaser orders by the code, the value shall be within the range allotted to that code a NOTESupplier and purchaser shall agree which two of these three properties are mandatory. X Y W 10 3 - = mN m 2 g -BS5626-3.5:1995 4 BSI 12-1999 Table 5A.2
30、Requirements for Class 5A papers Property Test method in Part 2 (Clause) Unit Requirements Remarks Water absorption (Klemm method) 19 mm Air permeability symbol M and H L W 10 W 5 Electric strength a.c. 21 kV/mm Air permeability symbol The electric strength is determined at room temperature after dr
31、ying the paper at105 C for1to2h and within 2min of removal from the oven Type L M H1 H2H5 (minimum values) 5A1 5A2 5A3 5A4 8.0 8.5 9.0 7.0 7.5 8.0 8.0 7.0 7.0 7.0 7.5 6.5 7.0 7.0 7.5 Dissipation factor of askarel heated with paper Using askarel T4 of IEC Publication588: Askarels for Transformers and
32、 Capacitors: tan: 0.2max. The measurement of electrical dissipation factor of askarels, changed by chemical ingredients of paper, is an optional test when agreed between supplier and purchaser. Askarel according to IEC Publication 588 is used. The askarel type is generally chosen according to an agr
33、eement between purchaser and supplier. As a model for transformer applications, Type T4 is preferred 1 Test apparatus and test liquid 1.1 A wide mouth250cm 3conical flask with a hollow ground-in stopper is cleaned thoroughly (toluene, chemical scouring powder, tap water, distilled water, pure methan
34、ol), dried (12h at105 2.5 C in an oven naturally ventilated) and cooled down to room temperature above silica gel in a desiccatorBS5626-3.5:1995 BSI 12-1999 5 Table 5A.2 Requirements for Class 5A papers Property Test method in Part 2 (Clause) Unit Requirements Remarks Dissipation factor of askarel h
35、eated with paper 1.2 A test cell for measuring the electrical dissipation factor of insulating liquids according to IEC Publication250: Recommended Methods for the Determination of the Permittivity and Dielectric Dissipation Factor of Electrical Insulating Materials at Power, Audio and Radio Frequen
36、cies including Metre Wavelengths, Sub-clause4.2.1 and IEC Publication 247: Measurement of Relative Permittivity, Dielectric Dissipation Factor and D.C. Resistivity of Insulating Liquids, is cleaned in the same way as in Sub-clause1.1. It is stored in an oven at105 2.5 C until it is to be used 1.3 Ne
37、w askarel is used for the test. The dissipation factor of the askarel should not be above 0.05, measured in the test cell of Sub-clause1.2. If the dissipation factor exceeds that value, the askarel is to be treated with absorbent clay 2 Procedure 2.1 5 0.5g of air-dried paper are cut into strips of
38、about 1cm 2cm and put into the conical flask of Sub-clause1.1. For this work the hands should be covered with disposable polyethylene gloves; the cutting device must be clean The test piece is dried24h at105 2.5 C in an oven as mentioned above and cooled down to room temperature above silica gel in
39、a desiccator 2.2 The dried test piece is weighed to the nearest0.1g. Askarel of Sub-clause1.3 weighing40times as much as this is added. The flask is closed with the stopper of sub-clause1.1 and stored at105 2.5 C for7days in an oven as mentioned before After this treatment the electrical dissipation
40、 factor of the decanted askarel is measured at90 C in the prepared test cell of Sub-clause1.2 In countries where the use of askarels is illegal this test is not required, but other impregnating liquids may be used for the test with the requirements agreed upon by the supplier and the purchaserBS5626
41、-3.5:1995 6 BSI 12-1999 Table 5A.2 Requirements for Class 5A papers 6 Special paper Class 5B The descriptions are given inTable 5B.1 and the requirements are given inTable 5B.2. Table 5B.1 Descriptions for Class 5B papers Property Test method in Part 2 (Clause) Unit Requirements Remarks Heat stabili
42、ty: Heat treatment to be120 C for7days Reduction of degree of polymerisation 24.3 % u 50 Values are given for papers704m in thickness Reduction of internal tearing resistance 24.1 % Under consideration Values for thinner papers are subject to contract Reduction of bursting strength 24.2 % u 20 NOTEP
43、roperty for criterion of heat stability should be subject to contract. Increase of conductivity of aqueous extract 12, 24 mS/m u 23 Class Type Description Further descriptions Conductivity of aqueous extract Air permeability (mS/m) (4m/Pas) Symbol Description Symbol Description 5B 5B1 Kraft insulati
44、ng paper of apparent densityu 0.75g/cm 3 2 u 10 L1 L2 L3 L4 M1 M2 M3 H1 H2 H3 H4 H5 u 0.005 0.005tou 0.01 0.01tou 0.02 0.02tou 0.05 0.05tou 0.1 0.1tou 0.2 0.2tou 0.5 0.5tou 1.0 1.0tou 2.0 2.0tou 5.0 5.0tou 8.0 8.0 5B2 Kraft insulating paper of apparent density 0.75tou 0.85 g/cm 3 5B3 Kraft insulatin
45、g paper of apparent density 0.85tou 0.95 g/cm 3 5B4 Kraft insulating paper of apparent density 0.95g/cm 3 Example: 5B2-2H1 signifies: a paper of nominal apparent density 0.5tou 1.04m/Pas. BS5626-3.5:1995 BSI 12-1999 7 Table 5B.2 Requirements for Class 5B papers Property Test method in Part 2 (Clause
46、) Unit Requirements Remarks Thickness a 2 4m Tolerance on nominal thickness By agreement between supplier and purchaser more than one layer may be used for measurements; otherwise in accordance with ISO Standard438 (pressure100 10kPa) Thickness 4m Tolerance u 75 75tou 105 105tou 125 125 10% 7% 6% 4%
47、 Substance (grammage) a 3 g/cm 2 Tolerance on nominal substances Substance g/m 2 Tolerance u 45 45 10% 5% Apparent density a 4 g/cm 3 Tolerance of 0.05 g/cm 3on the nominal value Tensile strength expressed as tensile index 5 Nm/g Air permeability class Machine direction (minimum) Cross- direction (m
48、inimum) To calculate tensile strength use the expression: where: X = tensile strength (kN/m) Y = tensile index (N.m/g) W = substance (g/m 2 ) L M H1H2 H3H5 98 93 93 88 37 35 34 34 Elongation at break 5 % Machine direction: 2.0 min. Cross-direction:4.0min. Internal tearing resistance expressed as tear index 6 Minimum values Substance g/m 2 Machine direction Cross- direction 30tou 80 80tou 120 120 5.0 6.0 8.0 6.0 7.0 9.0 Moisture content 10 % Maximum 8.0 Ash 11 % Maximum 1.0 Conductivity of aqueous extract 12 mS/m Maximum 10.0 pH of aqueous extract 13 6.0 to 8.0 Air permeability 18 4m/Pas
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