1、BRITISH STANDARD BS EN 60641-2:2004 Pressboard and presspaper for electrical purposes Part 2: Methods of tests The European Standard EN 60641-2:2004 has the status of a British Standard ICS 17.220.99; 29.935.10 BS EN 60641-2:2004 This British Standard was published under the authority of the Standar
2、ds Policy and Strategy Committee on 2 November 2004 BSI 2 November 2004 ISBN 0 580 44707 3 National foreword This British Standard is the official English language version of EN 60641-2:2004. It is identical with IEC 60641-2:2004. It supersedes BS EN 60641-2:1996 which is withdrawn. The UK participa
3、tion in its preparation was entrusted by Technical Committee GEL/15, Insulating material, to Subcommittee GEL/15/3, Material specifications, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The Bri
4、tish Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards On
5、line. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the respons
6、ible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover
7、, the EN title page, pages 2 to 25 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60641-2 NORME EUROPENNE EUROPISCHE NORM October 2004 CENELEC European C
8、ommittee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENE
9、LEC members. Ref. No. EN 60641-2:2004 E ICS 17.220.99 ; 29.935.10 Supersedes EN 60641-2:1995English version Pressboard and presspaper for electrical purposes Part 2: Methods of tests (IEC 60641-2:2004) Carton comprim et papier comprim usages lectriques Partie 2: Mthodes dessai (CEI 60641-2:2004) Taf
10、el- und Rollenpressspan fr elektrotechnische Anwendungen Teil 2: Prfverfahren (IEC 60641-2:2004) This European Standard was approved by CENELEC on 2004-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standar
11、d the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French
12、, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cy
13、prus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 15C/1609/FDIS, fut
14、ure edition 2 of IEC 60641-2, prepared by SC 15C, Specifications, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60641-2 on 2004-09-01. This European Standard supersedes EN 60641-2:1995. The main changes with respect to EN 60641-2
15、:1995 are listed below: The following test methods have been cancelled: flexibility; conductivity of the organic extract; contamination of liquid dielectrics. The following test methods have been rewritten: compressibility; conductivity of the aqueous extract; cohesion between plies. The following t
16、est method has been introduced: determination of metallic particles with X-ray. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-06-01 latest date by which the national st
17、andards conflicting with the EN have to be withdrawn (dow) 2007-09-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60641-2:2004 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, t
18、he following notes have to be added for the standards indicated: IEC 60247 NOTE Harmonized as EN 60247:2004 (not modified). ISO 186 NOTE Harmonized as EN ISO 186:2002 (not modified). _ Page2 EN606412:2004 CONTENTS 1 Scope.5 2 Normative references.5 3 Terms and definitions .6 4 General notes on tests
19、 .6 4.1 Conditioning6 4.2 Drying.6 4.3 Tolerances 6 4.4 Results7 5 Thickness.7 5.1 Test apparatus7 5.2 Setting gauge7 5.3 Procedure.8 5.4 Results8 6 Apparent density8 7 Tensile strength and elongation9 7.1 Principle9 7.2 Determination with non-folded test pieces .9 7.3 Determination with folded test
20、 pieces 9 8 Internal tearing resistance9 9 Edge tearing resistance10 9.1 Procedure.10 9.2 Results10 10 Compressibility.10 10.1 Principle10 10.2 Test apparatus10 10.3 Test pieces10 10.4 Procedure.10 10.5 Results11 11 Shrinkage.11 11.1 Test apparatus11 11.2 Test pieces11 11.3 Procedure.12 11.4 Results
21、12 12 Plybond resistance .12 12.1 Principle12 12.2 Test pieces12 12.3 Test apparatus12 12.4 Test method12 12.5 Results13 13 Moisture content.13 14 Ash content13 Page3 EN606412:2004 15 Conductivity of aqueous extract14 15.1 Test apparatus14 15.2 Procedure.14 15.3 Results14 16 pH of aqueous extract 15
22、 16.1 Test apparatus15 16.2 Procedure.15 16.3 Results15 17 Oil absorption.15 17.1 Test pieces15 17.2 Procedure.15 17.3 Results16 18 Conducting paths.16 19 Presence of metallic particles.16 19.1 Chemical methods.16 19.2 X-ray method.17 20 Electric strength.19 20.1 Test apparatus19 20.2 Test pieces fo
23、r test in air.19 20.3 Test pieces for test in oil .19 20.4 Test pieces for testing after folding19 20.5 Number of tests.20 20.6 Procedure.20 20.7 Results20 Annex ZA (normative) Normative references to international publications with their corresponding European publications .24 Bibliography25 Figure
24、 1 Folding sequence.20 Figure 2 Folding apparatus 21 Figure 3 Double prick punch 21 Figure 4 Measuring calliper21 Figure 5 Plybond resistance tester.22 Figure 6 Folding device22 Figure 7 Folding apparatus (For dimensions, see Figure 2)23 Page4 EN606412:2004 PRESSBOARD AND PRESSPAPER FOR ELECTRICAL P
25、URPOSES Part 2: Methods of tests 1 Scope This part of IEC 60641 applies to pressboard and presspaper for electrical purposes. The series does not apply to laminated material. This part specifies the test methods to be used in testing pressboard and presspaper for electrical purposes to meet the requ
26、irements prescribed in the specification sheets of Part 3. NOTE In this standard, reference is made in several places to ISO standards accompanied by a short description of the method used. It is to be understood that this short description is meant for identification purposes only and that all deta
27、ils should be taken from the ISO standard itself. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
28、ny amendments) applies. IEC 60243-1:1998, Electrical strength of insulating materials Test methods Part 1: Tests at power frequencies IEC 60296:2003, Fluids for electrotechnical applications Unused mineral insulating oils for transformers and switchgear IEC 60554-2:2001, Cellulosic papers for electr
29、ical purposes Part 2: Methods of test ISO 287:1985, Paper and board Determination of moisture content Oven-drying method ISO 534:1988, Paper and board Determination of thickness and apparent bulk density or apparent sheet density ISO 1924-2:1994, Paper and board Determination of tensile properties P
30、art 2: Constant rate of elongation method ISO 1974:1990, Paper Determination of tearing resistance (Elmendorf method) ISO 2144:1997, Paper, board and pulps Determination of residue (ash) on ignition at 900 degrees C Page5 EN606412:2004 3 Terms and definitions For the purposes of this document, the f
31、ollowing terms and definitions apply. 3.1 specimen rectangle of paper or board cut to given dimensions from sheets or reels drawn from selected units 3.2 test piece quantity of paper or board on which each single determination is carried out in accordance with the method of test. NOTE The test piece
32、 may be taken from a specimen; in some instances, it may be the specimen itself. 4 General notes on tests 4.1 Conditioning a) For materials with a thickness of 5 Time (h) 12 24 48 72 4.3 Tolerances When tolerances are not specified for the dimensions of the test piece, it is understood that these di
33、mensions are taken to the nearest millimetre. Page6 EN606412:2004 4.4 Results As a general rule, the central value is reported as the result. When agreed between parties, the mean value may be reported. This must be noted in the test report. 5 Thickness For material with a grammage of less than 224
34、g/m 2 , use the procedure as described in ISO 534. For materials with a grammage of 224 g/m 2or more, use the following test: 5.1 Test apparatus One of the test apparatus described below shall be used. NOTE In case of dispute, the test apparatus should be the one described in 5.1.2. 5.1.1 Screw type
35、 micrometer An external screw type micrometer having measuring faces of 6 mm to 8 mm diameter. The measuring faces shall be flat to within 0,001 mm and parallel to within 0,003 mm. The pitch of the screw shall be 0,5 mm and the graduations shall be 50 divisions 0,01 mm, enabling readings to be estim
36、ated to 0,002 mm. The pressure exerted on the test piece shall be 0,1 MPa to 0,3 MPa. NOTE For thin, soft material (for instance, board type B.5.1, 1 mm) the error due to the pressure of the micrometer can be as great as 2 % of the measured value. 5.1.2 Dead weight micrometer A dead weight dial type
37、 micrometer having two ground and lapped measuring concentric circular surfaces flat to within 0,001 mm and parallel to within 0,003 mm. The upper surface shall be 6 mm to 8 mm diameter. The lower surface shall be larger than the upper surface. The upper surface shall move on the axis perpendicular
38、to the surfaces. The dial shall be graduated to read directly to 0,002 mm. The frame of the micrometer shall be of such rigidity that a force of 15 N applied to the dial housing, out of contact with either the weight or the presser foot spindle, will produce a deflection of frame not greater than 0,
39、002 mm as indicated on the micrometer dial. The pressure exerted on the test piece shall be 0,1 MPa to 0,3 MPa. 5.1.3 Dial gauge micrometer As an alternative to 5.1.2, a “Dial gauge type micrometer“ with the following characteristics may be used: Diameter of the upper measuring surface: (14,3 0,5) m
40、m. Diameter of the lower measuring surface: bigger than the upper one. Pressure exerted on the test piece: (0,055 0,005) MPa. The two measuring surfaces shall be parallel to within 0,005 mm or 1 %. NOTE The values recorded with this apparatus could be significantly different from the ones recorded w
41、ith the two other types. 5.2 Setting gauge The setting gauge used to check the instruments shall be accurate to within 0,001 mm of nominal thickness. The thickness indicated by the instruments shall not differ by more than 0,005 mm from the gauge block. Page7 EN606412:2004 5.3 Procedure Measure the
42、thickness of the pressboard or the presspaper in the as received condition using one of the instruments described in 5.1 at points not less than 20 mm from the edges. For the pressboard, the number of measurements shall be eight, two along each edge. For presspaper in reels, 5.1 of IEC 60554-2 must
43、be followed. When measuring across the width of a reel, the number of measurements shall be five per metre. In case of dispute, cut a strip 40 mm wide across the full width of the material and, from this strip, at eight equally spaced positions, cut eight test pieces, each not less than 40 mm long.
44、Condition the test pieces in accordance with 4.1 and measure the thickness of each specimen at a point near the centre of each test piece using the instrument described in 5.1.2. 5.4 Results The central value is taken as the result and reported together with the minimum and maximum values. 6 Apparen
45、t density The test shall be carried out on three conditioned test pieces; one determination is made on each of the three test pieces. Use rectangular test pieces of an area not less than 100 cm 2and determine the mass to an accuracy of 10 4 mass of test piece. Make two measurements of the length and
46、 two of the width of each test piece to an accuracy of 0,1 mm at points at least 12 mm from the corners. Determine the thickness by making eight measurements as indicated in 5.3 and calculate the mean value of the measurements. Express the apparent density (the mass to volume ratio) as g/cm 3 . 3 10
47、 = w l s m where m is the mass, in g; s is the mean of the eight thickness measurements, in mm; l is the mean of the two length measurements, in mm; w is the mean of the two width measurements, in mm. Report all three values. The central value shall be taken as the result. Page8 EN606412:2004 7 Tens
48、ile strength and elongation 7.1 Principle Measurement of the tensile force required under standardized test conditions to cause failure of test pieces 15 mm 250 mm cut from both directions of the material. The tensile strength, in MPa, is calculated by the formula: a w F = where F is the force, in N
49、; w is the width of the specimen, in mm; a is the thickness of the specimen, in mm. 7.2 Determination with non-folded test pieces Tensile strength and elongation shall be measured according to the method described in ISO 1924-2 with the following exceptions: Nine measurements are made on test pieces cut in the machine direction and nine others on test pieces cut in the cross machine
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