BS-EN-60851-5-2008.pdf

raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI British Standards WB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1 Winding wires Test methods PartPart 5:5: ElectricalElectrical propertiesproperties BS EN 60851-5:2008 raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI British Standards Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI National foreword This British Standard is the UK implementation of EN 60851-5:2008. It is identical to IEC 60851-5:2008. It supersedes BS EN 60851-5:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee GEL/55, Winding wires. A list of organizations represented on this committee 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. © BSI 2009 ISBN 978 0 580 57223 4 ICS 29.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on Amendments issued since publication Amd. No. Date Text affected BRITISH STANDARDBS EN 60851-5:2008 31 January 2009 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60851-5 NORME EUROPÉENNE EUROPÄISCHE NORM September 2008 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60851-5:2008 E ICS 29.060.10 Supersedes EN 60851-5:1996 + A1:1997 + A2:2004 English version Winding wires - Test methods - Part 5: Electrical properties (IEC 60851-5:2008) Fils de bobinage - Méthodes d'essai - Partie 5: Propriétés électriques (CEI 60851-5:2008) Wickeldrähte - Prüfverfahren - Teil 5: Elektrische Eigenschaften (IEC 60851-5:2008) This European Standard was approved by CENELEC on 2008-08-01. 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 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 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, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI EN 60851-5:2008 - 2 - Foreword The text of document 55/1069/FDIS, future edition 4 of IEC 60851-5, prepared by IEC TC 55, Winding wires, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60851-5 on 2008-08-01. This European Standard supersedes EN 60851-5:1996 + A1:1997 + A2:2004. Significant revisions to EN 60851-5:1996 include the following points: in Subclause 5.3, the addition of the use of carbon brush electrodes for the counting discontinuities during the high voltage continuity test, as an alternative to the V-groove pulley electrode; clarifications in the breakdown voltage test for round wires larger than 2,500 mm and for fibrous covered wires. 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) 2009-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-08-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60851-5:2008 was approved by CENELEC as a European Standard without any modification. _ BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI - 3 - EN 60851-5:2008 Annex ZA (normative) Normative references to international publications with their corresponding European publications 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 any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60851-1 -1) Winding wires - Test methods - Part 1: General EN 60851-1 19962) 1) Undated reference. 2) Valid edition at date of issue. BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 2 60851-5 © IEC:2008 CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Test 5: Electrical resistance7 4 Test 13: Breakdown voltage .8 4.1 Principle8 4.2 Equipment.8 4.3 Enamelled round wire with a nominal conductor diameter up to and including 0,100 mm 9 4.4 Enamelled round wire with a nominal conductor diameter over 0,100 mm up to and including 2,500 mm.10 4.4.1 Test at room temperature 10 4.4.2 Test at elevated temperature.11 4.5 Round wire with a nominal conductor diameter over 2,500 mm12 4.5.1 Test at room temperature 12 4.5.2 Test at elevated temperature.14 4.6 Fibre wound round wire .14 4.6.1 Test at room temperature 14 4.6.2 Test at elevated temperature.16 4.7 Rectangular wire .16 4.7.1 Test at room temperature 16 4.7.2 Test at elevated temperature.16 5 Test 14: Continuity of insulation (applicable to enamelled round and tape wrapped round wire).17 5.1 General.17 5.2 Low-voltage continuity (nominal conductor diameter up to and including 0,050 mm).17 5.3 High-voltage continuity (nominal conductor diameter over 0,050 mm up to and including 1,600 mm) .17 5.3.1 Principle 17 5.3.2 Equipment .18 5.3.3 Procedure21 5.3.4 Result22 6 Test 19: Dielectric dissipation factor (applicable to enamelled wire and bunched wire).22 6.1 Principle22 6.2 Equipment.22 6.3 Specimen 23 6.3.1 Specimen for a metal bath electrode23 6.3.2 Specimen for a conductive suspension electrode.23 6.4 Procedure .24 6.5 Result .24 7 Test 23: Pin hole test24 Annex A (informative) Dissipation factor methods 25 Figure 1 Arrangement of cylinder and specimen for the breakdown voltage test.10 BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 60851-5 © IEC:2008 3 Figure 2 Device for twisting the specimen for breakdown voltage test 11 Figure 3 U-bend specimen for the breakdown voltage test (specimen placed in shot bath).13 Figure 4 Coil-wound specimen for the breakdown voltage test .15 Figure 5 Apparatus for testing the low-voltage continuity of covering .17 Figure 6 High-voltage d.c. continuity Pulleys for wire size 0,050 mm to 0,250 mm 19 Figure 7 Pulley dimensions and spacing for wire size 0,250 mm to 1,600 mm19 Figure 8a Graphite fibre single brush electrode assembly 20 Figure 8b Graphite fibre dual brush electrode assembly.21 Figure 8 Graphite fibre single or dual brush electrode asssembly.21 Figure 9 Suitable electrode arrangement for testing the dielectric dissipation factor.23 Figure A.1 Example of linear method for sole coating.27 Figure A.2 Example of logarithmic method for sole coating 27 Table 1 Rates of test voltage increase .8 Table 2 Loads applied to the wire 9 Table 3 Loads applied to the wire and number of twists .11 Table 4 Fault currents18 Table 5 Test voltages.22 BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 6 60851-5 © IEC:2008 INTRODUCTION This part of IEC 60851 forms an element of a series of standards which deals with insulated wires used for windings in electrical equipment. The series has three groups describing a) winding wires Test methods (IEC 60851); b) specifications for particular types of winding wires (IEC 60317); c) packaging of winding wires (IEC 60264). BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 60851-5 © IEC:2008 7 WINDING WIRES TEST METHODS Part 5: Electrical properties 1 Scope This part of IEC 60851 specifies the following tests: Test 5: Electrical resistance; Test 13: Breakdown voltage; Test 14: Continuity of insulation; Test 19: Dielectric dissipation factor; Test 23: Pin hole. For definitions, general notes on methods of test and the complete series of methods of test for winding wires, see IEC 60851-1. 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 (including any amendments) applies. IEC 60851-1, Winding wires Test methods Part 1: General 3 Test 5: Electrical resistance Electrical resistance is the d.c. resistance at 20 °C of 1 m of wire. The method used shall provide a precision of 0,5 %. For bunched wires a length of up to 10 m shall be used and the ends shall be soldered before the measurement. When measuring the resistance to check for an excessive number of broken wires, a length of 10 m of bunched wire shall be used. If the resistance Rt is measured at a temperature t other than 20 °C, the resistance R20 at 20 °C shall be calculated by means of the following formula: R20 = )(201 t +t R where t is the actual temperature in degrees Celsius during the measurement; is the temperature coefficient in K1. BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 8 60851-5 © IEC:2008 In the temperature range from 15 °C to 25 °C, the temperature coefficient to be used shall be: for copper: 20 = 3,96 × 103 K1; for aluminium: 20 = 4,07 × 103 K1. One test shall be made. The electrical resistance shall be reported. 4 Test 13: Breakdown voltage 4.1 Principle The test voltage shall be an a.c. voltage of 50 Hz or 60 Hz nominal frequency. The test voltage shall be applied at zero and increased at a uniform rate according to Table 1. Table 1 Rates of test voltage increase Breakdown voltage V Over Up to and including Rate of increase V/s 500 20 500 2 500 100 2 500 500 4.2 Equipment The following equipment shall be used: test transformer with a rated power of at least 500 VA providing an a.c. voltage of an undistorted sine waveform under test conditions, with a peak factor being within the limits of 2± 5 % (1,34 to 1,48) and with a capacity to supply a current of 5 mA with a maximum voltage drop of 2 %; fault detection circuit, which operates at a current of 5 mA or more; arrangement to provide a uniform rise of the test voltage at the specified rate; oven with forced air circulation; polished metal cylinder, 25 mm ± 1 mm in diameter, mounted with its axis horizontal (see Figure 1) and electrically connected to one terminal of the test voltage supply; twisting device according to Figure 2, that allows to twist two pieces of wire for a length of 125 mm; strips of metal foil, 6 mm in width and pressure sensitive tape, 12 mm in width; container with metal shot of stainless steel or nickel-plated iron. The diameter of the shot shall not exceed 2 mm. The shot shall be cleaned periodically by suitable means; metal mandrel, 50 mm ± 2 mm in diameter; metal mandrel, 25 mm ± 1 mm in diameter. BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 60851-5 © IEC:2008 9 4.3 Enamelled round wire with a nominal conductor diameter up to and including 0,100 mm A straight piece of wire with the insulation removed at one end shall be connected to the upper terminal as shown in Figure 1 and wound once around the cylinder. A load as specified in Table 2 shall be applied to the lower end of the wire to keep the specimen in close contact with the cylinder. The test voltage shall be applied according to 4.1 between the conductor of the wire and the cylinder. The test shall be carried out at room temperature. Five specimens shall be tested. The five single values shall be reported. Table 2 Loads applied to the wire Nominal conductor diameter mm Over Up to and including Load N 0,018 0,020 0,022 0,025 0,028 0,032 0,036 0,040 0,045 0,050 0,056 0,063 0,071 0,080 0,090 0,018 0,020 0,022 0,025 0,028 0,032 0,036 0,040 0,045 0,050 0,056 0,063 0,071 0,080 0,090 0,100 0,013 0,015 0,020 0,025 0,030 0,040 0,050 0,060 0,080 0,100 0,120 0,150 0,200 0,250 0,300 0,400 BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontrolled Copy, (c) BSI 10 60851-5 © IEC:2008 Test voltage Test voltage Load 1 2 3 4 IEC 1271/08 1 specimen 2 insulating material 3 upper terminal 4 cylinder Figure 1 Arrangement of cylinder and specimen for the breakdown voltage test 4.4 Enamelled round wire with a nominal conductor diameter over 0,100 mm up to and including 2,500 mm 4.4.1 Test at room temperature A straight piece of wire, approximately 400 mm in length, with the insulation removed at both ends, shall be twisted back on itself for a distance of (125 ± 5) mm on the twisting device as shown in Figure 2. The ends of the wire shall be joined, and the load applied with the number of twists, as given in Table 3. The loop at the end of the twisted section shall be cut at two places to provide a maximum spacing between the cut ends. Any bending to ensure adequate separation between the two wire ends shall avoid sharp bends or damage to the coating. The test voltage shall be applied according to 4.1 between the conductors of the wires. Five specimens shall be tested. The five single values shall be reported. BS EN 60851-5:2008 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:49, Uncontroll