BS EN 60763-2-2007 Specification for laminated pressboard - Methods of test《层压板规范 试验方法》.pdf

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1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 2: Methods of testThe European Standard EN 60763-2:2007 has the status of a British StandardIC

2、S 17.220.99; 29.035.10Specification for laminated pressboard BRITISH STANDARDBS EN 60763-2:2007BS EN 60763-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007ISBN 978 0 580 50708 3Amendments issued since publicationAmd.

3、 No. Date Commentsrequest to its secretary.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 cannot confer immunity from legal obligations. National forewordThis British Standa

4、rd was published by BSI. It is the UK implementation of EN 60763-2:2007. It is identical with IEC 60763-2:2007. It supersedes BS EN 60763-2:1996 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/15, Solid electrical insulating materials, to Subcommit

5、tee GEL/15/3, Material specifications.A list of organizations represented on this committee can be obtained on EUROPEAN STANDARD EN 60763-2 NORME EUROPENNE EUROPISCHE NORM March 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europ

6、isches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60763-2:2007 E ICS 17.220.99; 29.035.10 Supersedes EN 60763-2:1996English

7、version Specification for laminated pressboard - Part 2: Methods of test (IEC 60763-2:2007) Spcification pour cartons comprims et contrecolls - Partie 2: Mthodes dessai (CEI 60763-2:2007) Bestimmung fr Blockspan - Teil 2: Prfverfahren (IEC 60763-2:2007) This European Standard was approved by CENELEC

8、 on 2007-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards

9、may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified

10、to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lu

11、xembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 60763-2:2007 2 Foreword The text of document 15/360/FDIS, future edition 2 of IEC 60763-2, prepared by IEC TC 15, Solid electrical insulating materials, was

12、submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60763-2 on 2007-03-01. This European Standard supersedes EN 60763-2:1996. EN 60763-2:2007 includes the following significant technical changes with respect to EN 60763-2:1996: the standard has generally been revised editori

13、ally and brought into line with EN 60641-2; the test method for the determination of the internal ply strength has been replaced with an alternative method; the test method for the determination of the thermal resistance has been enlarged in its scope. The following dates were fixed: latest date by

14、which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-03-01 Annex ZA has been added by CENELEC. _ Endorsement notice

15、The text of the International Standard IEC 60763-2:2007 was approved by CENELEC as a European Standard without any modification. _ 3 EN 60763-2:2007 CONTENTS INTRODUCTION.5 1 Scope 6 2 Normative references .6 3 Conditioning of test specimens .7 4 Drying of test specimens.7 4.1 Method A (preferable)7

16、 4.2 Method B.7 5 Dimensions 7 5.1 Thickness7 6 Mechanical tests.8 6.1 Flexural strength and load to produce a standard deflection .8 6.2 Apparent modulus of elasticity in flexure 9 7 Compressibility.9 7.1 Principle9 7.2 Test apparatus 10 7.3 Test pieces10 7.4 Procedure .10 7.5 Results10 8 Electric

17、strength in oil .11 8.1 General and conditioning .11 8.2 Electric strength along laminate (edgewise electric strength) 11 9 Internal ply strength, thermal resistance and oil compatibility.11 9.1 Principle11 9.2 Test specimens .11 9.3 Test apparatus 12 9.4 Procedure .12 9.5 Determination of the flexu

18、ral strength.12 9.6 Results13 10 Apparent density 13 10.1 Test specimens .13 10.2 Procedure .13 10.3 Results13 11 Moisture content.14 12 Shrinkage in air after drying14 12.1 Test specimens .14 12.2 Procedure .14 12.3 Results14 13 Oil absorption.14 13.1 Test specimens .14 13.2 Procedure .15 13.3 Resu

19、lts15 14 Ash content 15 14.1 Procedure .15 14.2 Results15 EN 60763-2:2007 4 15 Contamination of liquid dielectrics.15 15.1 Apparatus15 15.2 Test specimens .16 15.3 Procedure .16 15.4 Results16 16 Conductivity of aqueous extract 16 16.1 Procedure .16 16.2 Results16 17 pH of aqueous extract.16 Annex Z

20、A (normative) Normative references to international publications with their corresponding European publications19 Figure 1 Position of test specimen in relation to length, width and thickness of sheet 16 Figure 2 Size of the test specimens and arrangement of the electrodes for testing the electric s

21、trength along laminae (edgewise electric strength).17 Figures 3 and 4 Alternative forms of vented electrodes .18 Table 1 Number of test specimens .12 5 EN 60763-2:2007 INTRODUCTION This International Standard deals with laminated pressboard as defined in Clause 2 of IEC 60763-1. IEC 60641 applies to

22、 pressboard which is not laminated, and the material covered by this International Standard is made from sheets conforming to the requirements of that publication. EN 60763-2:2007 6 SPECIFICATION FOR LAMINATED PRESSBOARD Part 2: Methods of test 1 Scope This part of IEC 60763 gives methods of test ap

23、plicable for the material classified in IEC 60763-1. 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 (includin

24、g any amendments) applies. IEC 60243-1:1998, Electrical strength of insulating materials Test methods Part 1: Tests at power frequencies IEC 60247:2004, Insulating liquids Measurement of relative permittivity, dielectric dissipation factor (tan ) and d.c. resistivity IEC 60250:1969, Recommended meth

25、ods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio and radio frequencies including metre wavelengths. IEC 60296:2003, Fluids for electrotechnical applications Unused mineral insulating oils for transformers and switchgea

26、r IEC 60641-2:2004, Pressboard and presspaper for electrical purposes Part 2: Methods of tests IEC 60763-1:1983, Specification for laminated pressboard Part 1: Definitions, classification and general requirements IEC 61125:1992, Unused hydrocarbon-based insulating liquids Test methods for evaluating

27、 the oxidation stability IEC 62021-1:2003, Insulating liquids Determination of acidity Part 1: Automatic potentiometric titration ISO 287:1985, Paper and board Determination of moisture content Oven-drying method ISO 2144:1997, Paper, board and pulps Determination of residue (ash) on ignition at 900

28、 degrees C 7 EN 60763-2:2007 3 Conditioning of test specimens Since the conditioning of laminated pressboard is very time-consuming, the material is tested either as received or dried. Only in case of dispute shall the material be conditioned according to the following procedure. The conditioning sh

29、all be made at 23 C 2 K and (50 5) % relative humidity until the moisture content of the specimen reaches 5,5 % to 8 %. The conditioning shall be approached from the dry side after drying at 70 C 5 K for a period sufficient to ensure that the conditioning atmosphere produces a mass increase in the s

30、pecimen. 4 Drying of test specimens 4.1 Method A (preferable) The test specimens shall be dried at 105 C 2 K for (24 1) h in an oven with forced air circulation and subsequently at 105 C 2 K for (48 2) h in a vacuum chamber at a residual pressure of not more than 1 kPa. The specimens shall then be r

31、emoved and allowed to cool in a desiccator before the test. 4.2 Method B Test specimens shall be dried in a ventilated oven at 105 C 2 K for (168 8) h at atmospheric pressure. When test pieces of the specified size are dried according to method B, test results similar to the test results obtained af

32、ter drying according to method A may be expected. 5 Dimensions 5.1 Thickness 5.1.1 Test apparatus An external screw-type micrometer having measuring faces of 6 mm to 8 mm diameter shall be used for testing. The measuring faces shall be flat to within 0,001 mm and parallel to within 0,003 mm. The mic

33、rometer shall be graduated in divisions of 0,01 mm and have an accuracy of 0,005 mm. The pressure exerted on the specimens shall be 0,1 MPa to 0,3 MPa. 5.1.2 Procedure The thickness of the laminated pressboard sheet shall be measured to the nearest 0,01 mm in the as-received condition at eight point

34、s, two along each edge, but not less than 20 mm from the edge. In case of dispute, a strip (40 1) mm wide shall be cut across the full width of the sheet and, from this strip, at eight equally spaced positions eight test specimens shall be cut, each not less than 40 mm long. The test specimens shall

35、 be conditioned in accordance with Clause 3 and the thickness of each measured at a point near the centre of each test specimen. 5.1.3 Result The central value of the eight measurements shall be taken as the result, and the minimum and maximum values obtained shall be reported. EN 60763-2:2007 8 5.1

36、.4 Flatness When any laminated pressboard sheet is placed without restraint, concave side up, on a flat surface, the departure at any point of the upper surface of the sheet from a light straight edge of (1000 10) mm or (500 5) mm, laid in any direction upon it, shall not exceed the value given in I

37、EC 60763-3 appropriate to the material, its thickness and length of straight edge. The mass of the straight edge shall not exceed (500 5) g. 6 Mechanical tests 6.1 Flexural strength and load to produce a standard deflection 6.1.1 General The test shall be carried out with the load applied perpendicu

38、lar to the laminations. 6.1.2 Test specimens Rectangular strips (20 1) mm wide and of a length of not less than 20 times the measured thickness shall be used. The thickness is that of the board under test except that, when the measured thickness of a test piece exceeds 20 mm, the thickness shall be

39、reduced to (20 1) mm, one face of the test piece being left intact. Five tests shall be carried out on specimens cut in machine direction (direction A) and five in cross-machine direction (direction B). (See definitions of directions A and B given in Figure 1.) If the machine direction is not known,

40、 five specimens shall be cut with their length parallel to one of the edges of the sheet and five specimens at right angle thereto. The set of test specimens giving the highest value of flexural strength is deemed to have been cut with the length in machine direction. 6.1.3 Test apparatus Universal

41、testing apparatus designed to bend a test piece of given dimensions at an appropriate constant rate of bending and to measure the force and the deflection at midpoint of the test piece. A test rig for the determination of the three-point bending strength. 6.1.4 Conditioning Test specimens shall be d

42、ried in accordance with Clause 4. 6.1.5 Procedure After cooling in a desiccator, the width of the test specimen shall be immediately measured with an accuracy of 0,1 mm and the thickness with an accuracy of 0,02 mm, and the test specimen shall be immediately placed lengthwise symmetrically across tw

43、o parallel supports. Where one surface has been removed, the original, intact surface shall rest on the two supports. Where they are in contact with the test specimen, the surfaces of the supports shall have a radius of (5 0,2) mm. The distance between the supports shall be 16 times the nominal thic

44、kness of the test specimen and shall be measured with an accuracy of 0,5 %. The load shall be applied across the width of the test specimen by means of a loading member parallel with, and mid-way between, the supports. The radius of the end of the loading member shall be (5 0,2) mm. 9 EN 60763-2:200

45、7 The load shall be increased steadily from zero to rupture by relative movement of the loading member and the supports at a constant rate. This rate of movement (which is the rate of deflexion of midpoint of the test specimen) shall be (5 0,5) mm/min. The load at a standard deflection of 0,4 mm sha

46、ll be noted. The maximum load shall be noted. 6.1.6 Results The flexural strength fin MPa of the test specimen shall be calculated as follows: 1,5bhLFf= where F is the maximum load (in N); L is the distance between the supports (in mm); b is the width of the test specimen (in mm); h is the thickness

47、 of the test specimen (mm). The flexural strength and load to produce the standard deflection in the machine and cross-machine direction shall be reported, as the central value of the results from the five test specimens, cut in each direction. 6.2 Apparent modulus of elasticity in flexure The appar

48、ent modulus of elasticity in flexure E in MPa can be calculated from the load at 0,4 mm deflection according to 6.1.4 using the following formula: 0,4433BFhbLE = where L is the distance between the supports (in mm); b is the width of the test specimen (in mm); h is the thickness of the test specimen

49、 (in mm); F is the load at deflection of 0,4 mm (in N). The apparent modulus of elasticity in flexure in the machine and cross-machine direction shall be reported, as the central value of the results from the five test specimens, cut in each direction. 7 Compressibility 7.1 Principle To determine the compressibility of laminated pressboard, a stack of test pieces shall be subjected to a low