1、BRITISH STANDARD BS EN 61628-2:1999 Incorporating amendment no. 1 Corrugated pressboard and presspaper for electrical purposes Part 2: Methods of test The European Standard EN 61628-2:1999, incorporating amendment A1:2007, has the status of a British Standard ICS 29.035.10 BS EN 61628-2:1999 This Br
2、itish Standard was published under the authority of the Standards Committee and comes into effect on 15 April 1999 BSI 2008 ISBN 978 0 580 60702 8 National foreword This British Standard is the UK implementation of EN 61628-2:1999, incorporating amendment A1:2007. It is identical with IEC 61628-2:19
3、98, incorporating amendment 1:2007. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by !“. The UK participation in
4、 its preparation was entrusted by Technical Committee GEL/15, Insulating materials, to Subcommittee GEL/15/3, Material specifications. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary
5、provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. Date Comments 17476 31 January 2008 See national forewordEUROPEAN STANDARD NORME EUROPENNE EUROP
6、ISCHE NORM EN61628-2 January1999 ICS29.035.10 English version Corrugated pressboard and presspaper for electricalpurposes Part2: Methods of test (IEC61628-2:1998) Cartons et papiers comprims onduls usages lectriques Partie2: Mthodes dessais (CEI61628-2:1998) Wellspan fr elektrotechnische Zwecke Teil
7、2: Prfverfahren (IEC61628-2:1998) This European Standard was approved by CENELEC on1999-01-01. 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-t
8、o-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, German). A version in any other language made by translation u
9、nder 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, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland,
10、 Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stass
11、art 35, B-1050 Brussels 1999 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref.No.EN61628-2:1999E +A1 July2007 Descriptors: Electrical insulating materials, solid electrical insulating materials, paper, paperboards, pressboards, corrugated ca
12、rdboards, tests, shrinkage, compressive strengthEN61628-2:1999 BSI 2007 2 Foreword The text of document15C/992/FDIS, future edition1 of IEC61628-2, prepared by SC15C, Specifications, of IEC TC15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61
13、628-2 on1999-01-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added byCENELEC. Endorsement notice The text of the International Standard IEC61628-2:1998 was approved by CENELEC as a
14、European Standard without any modification. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative reference 3 3 General note on tests 3 4 Type and dimension of corrugation 3 5 Moisture content 4 6 Dimensional changes on drying 4 7 Compressive strength and compression modulus 5 8 Conductivity
15、 of aqueous extract 6 Annex ZA (normative) Normative references tointernational publications with their correspondingEuropean publications 10 Figure 1 Different types of corrugation 7 Figure 2 Positioning of the test specimen 7 Figure 3 Test specimen holderSide view 8 Figure 4 Curve of deflection ve
16、rsus force 9 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1999-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2000-10-01 Foreword to amendment A1 Endor
17、sement notice latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop)2008-04-01 latest date by which the national standards conflicting with the amendment to be withdrawn (dow) 2010-07-01 have The text of doc
18、ument 15/293/CDV, future amendment 1 to IEC 61628-2:1998, prepared by IEC TC 15, Solid electrical insulating materials, was submitted to the IEC-CENELEC parallel Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 61628-2:1998 on 2007-07-01. The following dates were fixed:
19、The text of amendment 1:2007 to the International Standard IEC 61628-2:1998 was approved by CENELEC as an amendment to the European Standard without any modification. EN61628-2:1999 BSI 2007 3 Introduction This part of IEC61628 is one of a series which deals with corrugated pressboard and presspaper
20、 for electrical purposes. This series consists of three parts: IEC61628-1:1997, Corrugated pressboard and presspaper for electrical purposes Part1:Definitions, designations and general requirements. IEC61628-2:1998, Corrugated pressboard and presspaper for electrical purposes Part2:Methods of test.
21、IEC61628-3, Corrugated pressboard and presspaper for electrical purposes Part3:Specification for individual materials. (under consideration) 1 Scope This part of IEC61628 gives methods of test applicable for the materials classified in IEC61628-1. 2 Normative reference The following normative docume
22、nt contains provisions which, through reference in this text, constitutes provisions of this part of IEC61628. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC61628 are encouraged to inve
23、stigate the possibility of applying the most recent editions of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. 3 General note on te
24、sts It is recommended to use a high-speed band saw with a cut width less than1mm to make the test specimens. The burrs made by cutting should be carefully removed. 4 Type and dimension of corrugation The shape and type of corrugation are defined by wavelength, maximum amplitude, the length of horizo
25、ntal parts, angle of slope and the board thickness out of which the corrugated material is made (seeFigure 1a and Figure 1b). The following tests are made on the material as received. 4.1 Wavelength 4.1.1 Procedure Cut at least three test samples, each test sample having a length greater than three
26、complete wavelengths. With a pencil, mark the starting line of the first wavelength and the end line of the last wavelength (minimum three wavelengths). (The best starting and end line of a wavelength is the line of maximum amplitude for a sine type corrugation and the centre of a horizontal part in
27、 an angular type corrugation.) Lay the test sample on a flat surface with no strain applied. Measure with a ruler (precise to0,5mm) the distance between the pencil lines. Divide the measured value by the number of wavelengths between the lines. 4.1.2 Results Report the mean, minimum and maximum valu
28、es of the measurements. 4.2 Amplitude 4.2.1 Procedure Cut at least nine specimens, each being(100 10)mm wide, and one-and-a-half to two wavelengths in length, so that two full bottom peaks are included. Lay the test specimens on a flat surface with no strain applied. With a gauge (precise to0,1mm),
29、measure the distance between the highest point and the lowest point. 4.2.2 Results Report the mean, minimum and maximum values of the measurements. !IEC 60641-2:2004, Pressboard and presspaper for electrical purposes Part 2: Methods of test “ !Unless otherwise specified, the test specimens after bei
30、ng cut, shall be conditioned according to IEC 60641-2. “ EN61628-2:1999 4 BSI 2007 4.3 Length of horizontal parts of corrugation 4.3.1 Procedure On at least three different corrugations, mark with a pencil the vertical projections of the theoretical points where the oblique parts of the corrugation
31、meet the horizontal part. The pencil marks shall be positioned on a line in the direction of the corrugation wavelength. Measure the distance between the pencil marks with a calliper precise to0,1mm (distance E in Figure 1b). Repeat the measurements at the opposite side of the sheet to measure the d
32、istance D in Figure 1b. Because D and E may be intentionally different, both measurements shall be reported. 4.3.2 Results Report for D and E the mean, minimum and maximum values of the measurements. 4.4 Angle of slope 4.4.1 Procedure Cut at least three specimens, each being(100 10)mm wide, and one-
33、and-a-half to two wavelengths in length, so that two full bottom peaks are included. Lay the test sample on a flat surface with no strain applied. With an adequate protractor (precise to0,5), measure the two angles of the central corrugation. 4.4.2 Results Report the mean, minimum and maximum values
34、 of the measurements. 4.5 Thickness of board 4.5.1 Procedure NOTEMeasures on the horizontal flat part should be avoided as the board thickness may have been affected by the direct action of the forming press when mechanical pressure has been used to manufacture the corrugated material. 4.5.2 Results
35、 Report the mean, minimum and maximum values of the measurements. 5 Moisture content 6 Dimensional changes on drying 6.1 Change of amplitude 6.1.1 Procedure (seeFigure 2) Place the specimens on a flat steel plate the dimensions of which shall exceed the dimensions of the specimen by at least50mm. Pl
36、ace a second flat rigid plate of calibrated thickness T,50mm wide and of sufficient length to cover all the corrugations, on top of the specimen. The weight of this plate shall guarantee that all the corrugations are in flat contact with both top and bottom plate and shall be defined in the specific
37、ation sheets of IEC61628-3. NOTEThe weight of the plate can be adjusted by additional weights added on top of it. If all the corrugations of any specimen are not in contact with top and bottom plate under this pre-load, the specimen shall be discarded. The amplitude of the corrugation of the specime
38、n is measured by means of a gauge precise to0,1mm with a semi-spherical sensor in the following way: lower the sensor of the gauge on to the bottom steel plate and adjust the pointer to zero; set the sensor on the top plate and read the measured values at three different points near the centre of th
39、e plate and form the mean of these three measures. Record this value as value B for each specimen. Remove and dry the test specimens in a ventilated oven at105 C 5K for (48 1)h. After cooling at room temperature in a desiccator, repeat the measurements as above. Record for each specimen the new valu
40、e as C. 6.1.2 Calculation The change of amplitude is calculated as a percentage of the original amplitude and is given by the formula: change of amplitude= There is normally an increase of amplitude after drying. 6.1.3 Results Report the mean value obtained. Minimum and maximum values should also be
41、 reported. CB BT -100 !With an external screw type micrometer as described in IEC 60641-2, make at least nine different measurements of the board thickness with an accuracy of 0,01 mm at points where the corrugation curve is flat, or in the area of the inflection point for a sine type corrugation. “
42、 !Moisture content shall be determined according to IEC 60641-2. “ !Cut three specimens (50 5) mm wide and five wavelengths long and condition them according to IEC 60641-2. “ EN61628-2:1999 BSI 2007 5 6.2 Lengthwise and crosswise dimensional changes 6.2.1 Procedure Measure the lengthwise and crossw
43、ise dimensions with a calliper precise to0,1mm (or equivalent) at two different positions. Record the mean value of the two measurements as the initial dimensions of the specimen. Remove and dry the test specimens in a ventilated oven at105C5K for (48 1)h. After cooling at room temperature in a desi
44、ccator, repeat the measurements as above. 6.2.2 Results The dimensional changes lengthwise and crosswise are calculated for each specimen as the per cent change in dimensions from those of the original conditioned specimen. Report all calculated values and the means of the lengthwise and crosswise v
45、alues. 7 Compressive strength and compression modulus 7.1 Purpose and principle of the test The purpose of the test is to calculate the compressive strength and the compression modulus of the material when the corrugation is submitted to a force applied on the corrugation and perpendicular to the or
46、iginal plane of the corrugated material. The perpendicular force is applied with the ends of the test specimens subjected to total restraint (seeFigure 3). 7.2 Test specimens Cut five test specimens (50 0,5)mm wide and five full wavelengths long unless the wavelength is60mm, it is permitted to use t
47、hree full wavelengths instead of five. The ends of the test specimens are cut within1mm of the crest of a corrugation, or in case of a angular type corrugation, within1mm of the centre line of a flat horizontal part. The two end cuts shall be parallel to the corrugation and to each other within0,1mm
48、. 7.3 Test apparatus The test apparatus shall consist of: a compression tester which will measure and record graphically the applied force with an accuracy of1%and the crosshead movement with a magnification of at least10times. The crosshead speed shall be such that the end point of the test is reac
49、hed within10s to30s; a test specimen holder, (an example is shown in Figure 3); a pressure plate whose dimensions cover completely all the crests of the specimens corrugations. 7.4 Procedure Place the test specimen in the test holder. Adjust the mobile end of the holder so that both ends touch evenly the ends of the test specimen without exerting any lateral force. Place the p
