1、BRITISH STANDARDBS EN 61033:2006Test methods for the determination of bond strength of impregnating agents to an enamelled wire substrateThe European Standard EN 61033:2006 has the status of a British StandardICS 17.220.99; 29.035.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g5
2、1g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61033:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI 2007ISBN 978 0 580 50057
3、2National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61033:2006. It is identical with IEC 61033:2006.The UK participation in its preparation was entrusted by Technical Committee GEL/15, Material specifications, to Subcommittee GEL/15/3, Resins and varnishes
4、.A list of organizations represented on GEL/15/3 can be obtained on request 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
5、 obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61033 NORME EUROPENNE EUROPISCHE NORM December 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Norm
6、ung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61033:2006 E ICS 17.220.99; 29.035.01 English version Test methods for the determination of bond strength of impre
7、gnating agents to an enamelled wire substrate (IEC 61033:1991 + A1:2006) Mthodes dessai pour la dtermination du pouvoir agglomrant des agents dimprgnation sur fil maill (CEI 61033:1991 + A1:2006) Prfverfahren zur Bestimmung der Verbackungsfestigkeit von Imprgniermitteln auf einem Lackdraht-Substrat
8、(IEC 61033:1991 + A1:2006) This European Standard was approved by CENELEC on 2006-11-01. 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
9、 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 under t
10、he 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, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany,
11、Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61033:2006 2 Foreword The text of the International Standard IEC 61033:1991 + A1:2006, prepare
12、d by IEC TC 15, Standards on specifications for electrical insulating materials, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 61033 on 2006-11-01 without any modification. The following dates were fixed: latest date by which the EN has to be implemented at natio
13、nal level by publication of an identical national standard or by endorsement (dop) 2007-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC
14、61033:1991 + A1:2006 was approved by CENELEC as a European Standard without any modification. _ 3 EN 61033:2006 CONTENTS 1 Scope 5 2 Methods of test.5 2.1 Method A: twisted coil test .5 2.2 Method B: helical coil test 6 2.3 Method C: wire bundle test 7 Annex ZA (normative) Normative references to in
15、ternational publications with their corresponding European publications 17 EN 61033:2006 4 INTRODUCTION This standard deals with three methods of test to determine the bond strength of impregnating agents in conjunction with enamelled wire substrates. The methods are as follows: 1) Twisted coil test
16、: method A 2) Helical coil test: method B 3) Wire bundle test: method C 5 EN 61033:2006 TEST METHODS FOR THE DETERMINATION OF BOND STRENGTH OF IMPREGNATING AGENTS TO AN ENAMELLED WIRE SUBSTRATE 1 Scope This standard describes three methods of test to determine the bond strength of impregnating agent
17、s such as solvent-based varnishes and solventless resins to an enamelled wire substrate. Bond strength may be affected by cure, by test temperature, by thermal ageing, and for any impregnating agent, by the chosen type of wire enamel. These three methods of test cover the prevailing standard practic
18、e of testing bond strength. For a certain group of materials, one of these methods may be assigned to be the referee method subject to a specification in the relevant specification sheet. 2 Methods of test 2.1 Method A: twisted coil test 2.1.1 Principle In this test, 0,315 mm diameter enamelled wind
19、ing wire in the form of a twisted coil is impregnated and cured. The maximum force to break this specimen is a measure of the bond strength. 2.1.2 Specimen Prepare a random wound coil from an enamelled winding wire (see note 1) by means of a suitable winding equipment (see figure 1a). To prevent ope
20、ning of the coil after removal from the winding equipment, each end of the winding wire, or short piece of enamelled wire may be wrapped around the coil two or three times in opposite directions. For this purpose the winding equipment is provided with appropriate notches (see figure 1b). For winding
21、 the coil, the following dimensions apply: winding diameter: 57 mm 1 mm width of the slot: 6 mm 1 mm number of turns: 100 (see note 2) nominal wire diameter: 0,315 mm NOTES 1 For enamelled winding wire see also IEC 317. 2 Instead of 100 turns, two times 50 turns may be used to provide a bifilar wind
22、ing that allows a.c. current heating of the coil if desired. Remove the coil from the winding equipment and stretch it into an oval shape. Twist the coil two full turns around its longitudinal axis by means of a twisting device (see figures 2a and 2b). The twisted coil formed is about 7 mm in diamet
23、er and 85 mm to 90 mm in length and serves as substrate for the impregnating agent. Unless otherwise specified in the purchase contract, treat the twisted coil once with the impregnating agent. With the twisted coil in the vertical position, immerse it in the impregnating agent for 5 min 1 min (see
24、note). Remove it slowly and uniformly at a maximum rate of 1 mm/s. Drain horizontally for 10 min to 15 min and cure horizontally according to the manufacturers recommendation or to an agreed schedule. If more than one treatment is to be given, dip, drain and cure the twisted coil vertically, reversi
25、ng the direction for each subsequent treatment. EN 61033:2006 6 Prepare five specimens for each test temperature. NOTE - Some impregnating agents, such as high viscosity or thixotropic products may require alternative processing methods. 2.1.3 Equipment Use equipment according to ISO 178. Dimensions
26、 of the supports of the test equipment shall comply with figure 3. 2.1.4 Procedures With the specimen properly positioned according to figure 3, adjust the crosshead speed so that the maximum force is reached in about 1 min. For tests at elevated temperatures (see note), a heating cabinet attached t
27、o the equipment may be used. Before testing, the test specimen shall be kept in the cabinet at the test temperature for a time just sufficient to ensure that the test specimen reaches this temperature. Extended heating of the specimen could affect the property. NOTE - In case of current heating, the
28、 test temperature of the test specimen should be determined by adequate means, e.g. thermocouple, resistance measurements. 2.1.5 Result The bond strength is expressed as the median value of the five measurements in newtons. 2.1.6 Report Report the following: reference to test method A of this standa
29、rd; details of the impregnating agent; details of the substrate (type of enamelled winding wire); details of specimen preparation (single or bifilar coil, impregnating details); test temperatures; bond strength and the minimum and maximum measured values for each test temperature; if the winding wir
30、e or test specimens have been washed in any manner so that they are no longer in an “as received“ condition, such procedure shall be noted in the report. 2.2 Method B: helical coil test 2.2.1 Principle In this test, 1 mm diameter wire in the form of a helical coil is coated with varnish and cured. T
31、he force necessary to break this coil is a measure of the bond strength. 2.2.2 Specimen Prepare a helical coil (see figure 4) from an enamelled winding wire (see note) by means of a suitable winding equipment. For winding the coil, the following dimensions apply: nominal wire diameter: 1 mm mandrel
32、diameter: 6,3 mm 0,1 mm length of coil: 75 mm 2 mm winding tension: 10 N 1 N NOTE - For enamelled winding wire see also IEC 317. Coils may be wound in a long continuous length and then cut off to size. 7 EN 61033:2006 Unless otherwise agreed in the purchase contract, treat the helical coil once with
33、 the impregnating agent. With the helical coil in the vertical position, immerse it in the impregnating agent for 60 s 10 s (see note). Remove it slowly and uniformly at a maximum rate of 1 mm/s. Drain horizontally for 10 min to 15 min and cure horizontally according to the manufacturers recommendat
34、ion or to an agreed schedule. If more than one treatment is to be given, dip, drain and cure the helical coil vertically reversing the direction for each subsequent treatment. Prepare five specimens for each test temperature. NOTE - Some impregnating agents, such as high viscosity or thixotropic pro
35、ducts may require alternative processing methods. 2.2.3 Equipment Use equipment according to ISO 178. Dimensions of the supports of the test equipment shall comply with figure 5. 2.2.4 Procedures With the specimen properly positioned according to figure 5, adjust the crosshead speed so that the maxi
36、mum force is reached in about 1 min. For tests at elevated temperatures (see note), attach a heating cabinet to the equipment. Before testing, keep the test specimen in the cabinet at the test temperature for a time just sufficient to ensure that the test specimen reaches this temperature. 2.2.5 Res
37、ult The bond strength is expressed as the median value of the five measurements in newtons. 2.2.6 Report Report the following: reference to test method B of this standard; details of the impregnating agent; details of the substrate (type of enamelled winding wire); details of specimen impregnation;
38、test temperatures; bond strength and the minimum and maximum measured values for each test temperature; if the winding wire or test specimens have been washed in any manner so that they are no longer in an “as received“ condition, such procedure shall be noted in the report. 2.3 Method C: wire bundl
39、e test 2.3.1 Principle In this test, 2 mm diameter wire in the form of a bundle is coated with varnish and cured. The force necessary to pull the central wire from the bundle is a measure of the bond strength. 2.3.2 Specimen Prepare a wire bundle (see figure 6 or 7) from an enamelled winding wire (s
40、ee note 1) in accordance with either procedure a) or b) below. EN 61033:2006 8 a) Arrange six lengths of wire 15 mm 0.5 mm long into a bundle around the end of a central wire at least 120 mm long as shown in figure 6 and secure in position by binding in two places with annealed copper wires 0,35 mm
41、diameter. Ensure that the end of the centre wire is flush with the end of the bundle. b) Arrange six lengths of wire, approximately 105 mm long, into a bundle around the end of a wire 120 mm long as shown in figure 7, so that they overlap 15 mm 0,5 mm and secure in position by binding with annealed
42、copper wire, 0,35 mm diameter. Insert a 50 mm length of the same wire into the central hole of the end of the bundle of six wires to be gripped in the jaws of a tensile testing machine and bind the end with copper wires as for the overlapped section on which the bond strength is to be determined. NO
43、TES 1 For enamelled winding wire see also IEC 317. 2 Carefully straighten the wire to be used for the specimens without damage to the surface of the enamel. If the wire is straightened by pulling, limit the elongation of the wire to less than 5 %. Cut the lengths of wire necessary to prepare one tes
44、t specimen from the same reel to ensure their diameters are sufficiently uniform to prevent the centre wire slipping during varnishing. At the ends of the wires ensure that there are no barbs or other protrusions which would influence the bond strength. When assembling the wires in accordance with p
45、rocedures a) or b) use a jig to position the ends of the outer wires to provide the required overlap. A plate, having a 2,8 mm diameter hole through which the centre wire passes until it meets a stop giving exactly 15 mm protrusion above the plate, has been found satisfactory. This can be used eithe
46、r to position the outer wires before these are secured by final tightening of the binding wires or, with the addition of a retaining collar, to assemble the bundle from the separate pieces of wire. A suitable design is shown in figure 8. This jig may be used on its side so that the bundle is horizon
47、tal to enable a known tension, for example 3 N, to be applied to the binding wire. Immerse the test specimen in the varnish to be tested with the single protruding wire uppermost for 5 min, then withdraw and drain for 15 min. Different durations of immersion and draining may be used and should in su
48、ch cases be noted in the report. Cure the specimens in accordance with the manufacturers recommendations. During all these operations, hold the test piece in a vertical position, and ensure that no excess varnish adheres to the end of the test specimen away from the protruding centre wire. Similarly
49、, do not allow any undue meniscus round the protruding wire. Prepare five specimens for each test temperature. NOTE - Some impregnating agents, such as high viscosity or thixotropic products may require alternative processing methods. 2.3.3 Equipment Use equipment according to ISO 178. Dimensions of the supports of the test equipment shall comply with figure 8. 2.3.4 Procedures Pull the test specimen made in accordance with procedure a) in a tensile testing machine by means of a
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