1、 IEC 60974-3 Edition 3.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Arc welding equipment Part 3: Arc striking and stabilizing devices Matriel de soudage larc Partie 3: Dispositifs damorage et de stabilisation de larc IEC60974-3:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IE
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15、rnational (VEI) en ligne. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60974-3 Edition 3.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Arc welding equipment Part 3: Arc str
16、iking and stabilizing devices Matriel de soudage larc Partie 3: Dispositifs damorage et de stabilisation de larc INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 25.160 PRICE CODE CODE PRIX ISBN 978-2-8322-1199-1 Registered trademark of the International Ele
17、ctrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60974-3 IEC:2013 CONTENTS FO
18、REWORD . 4 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 Environmental conditions . 7 5 Tests . 7 5.1 Test conditions 7 5.2 Measuring instruments . 7 5.3 Conformity of components . 7 5.4 Type tests 7 5.5 Routine tests 7 5.5.1 Stand-alone unit . 7 5.5.2 Built-in unit . 8 6 Protection
19、 against electric shock . 8 6.1 Insulation . 8 6.1.1 General 8 6.1.2 Clearances . 8 6.1.3 Creepage distances 8 6.1.4 Insulation resistance . 9 6.1.5 Dielectric strength . 9 6.2 Protection against electric shock in normal service (direct contact) 10 6.3 Protection against electric shock in case of a
20、fault condition (indirect contact) . 10 6.4 Protective provision . 10 7 Thermal requirements 10 8 Thermal protection 10 9 Abnormal operation . 10 10 Connection to the supply network 11 11 Output . 11 11.1 Rated peak voltage 11 11.2 Impulse current 12 11.2.1 Risk of electric shock 12 11.2.2 Electric
21、charge 12 11.2.3 Direct contact . 12 11.2.4 Series contact. 13 11.3 Mean energy 14 11.4 Output circuit capacitance discharging . 15 12 Control circuits 15 13 Hazard reducing device . 15 14 Mechanical provisions . 15 15 Rating plate . 15 16 Adjustment of the output 16 17 Instructions and markings 16
22、17.1 Instructions 16 17.2 Markings 17 60974-3 IEC:2013 3 Annex A (informative) Examples of coupling systems for arc striking and stabilizing devices . 18 Annex B (informative) Example of a rating plate . 19 Bibliography 20 Figure 1 Rated peak voltage 11 Figure 2 Measurement of electric charge of imp
23、ulse current 12 Figure 3 Measuring circuit for direct contact . 13 Figure 4 Measuring circuit for serial contact . 14 Figure 5 Measurement of mean energy 14 Figure 6 Measuring circuit for capacitance discharging 15 Figure A.1 Examples of coupling systems for arc striking and stabilizing devices 18 F
24、igure B.1 Stand-alone unit . 19 Table 1 Minimum clearances and creepage distances for arc striking and stabilizing circuits 9 Table 2 Maximum peak voltages 11 4 60974-3 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ARC WELDING EQUIPMENT Part 3: Arc striking and stabilizing devices FOREWORD 1)
25、 The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical
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34、of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that so
35、me of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60974-3 has been prepared by IEC technical committee 26: Electric welding. This third edition cancels and replac
36、es the second edition published in 2007 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: changes induced by the publication of IEC 60974-1:2012. 60974-3 IEC:2013 5 The text of this standard is based on the f
37、ollowing documents: FDIS Report on voting 26/518/FDIS 26/521/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. This standard shal
38、l be read in conjunction with IEC 60974-1:2012. The list of all the parts of IEC 60974, under the general title Arc welding equipment, can be found on the IEC web site. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC
39、 web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 60974-3 IEC:2013 ARC WELDING EQUIPMENT Part 3: Arc striking and stabilizing devices 1 Scope This part of
40、 IEC 60974 specifies safety requirements for industrial and professional arc striking and arc stabilizing devices used in arc welding and allied processes. This part of IEC 60974 is applicable to stand-alone units which may be connected to a separate welding power source or one where the welding pow
41、er source and the arc striking and arc stabilizing device are housed in a single enclosure. NOTE 1 Typical allied processes are for example plasma arc cutting and arc spraying. NOTE 2 This standard does not include electromagnetic compatibility (EMC) requirements. 2 Normative references The followin
42、g documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60974-1:2012, A
43、rc welding equipment Part 1: Welding power sources IEC 60974-7, Arc welding equipment Part 7: Torches IEC 61140, Protection against electric shock Common aspects for installation and equipment 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60974-1 a
44、nd IEC 60974-7, as well as the following, apply. 3.1 arc striking device device which superimposes a voltage on the welding circuit to ignite an arc 3.2 arc stabilizing device device which superimposes a voltage on the welding circuit to maintain an arc 3.3 arc striking voltage voltage superimposed
45、on the no-load voltage to ignite an arc 3.4 arc stabilizing voltage voltage superimposed on the arc voltage to maintain the arc 60974-3 IEC:2013 7 3.5 arc striking period period during which the arc striking voltage is superimposed on the no-load voltage 4 Environmental conditions As specified in IE
46、C 60974-1:2012, Clause 4. 5 Tests 5.1 Test conditions As specified in 5.1 of IEC 60974-1:2012. 5.2 Measuring instruments The accuracy of measuring instruments shall be as follows: a) electrical measuring instruments: class 1 (1 % of full-scale reading), except for the measurement of insulation resis
47、tance and dielectric strength where the accuracy of the instruments is not specified, but shall be taken into account for the measurement; b) thermometer: 2 K; c) high-voltage probe: 5 %. 5.3 Conformity of components As specified in 5.3 of IEC 60974-1:2012. 5.4 Type tests As a condition of conformit
48、y, the type tests given below shall be carried out on stand-alone units in the following sequence with no drying time between f), g) and h): a) general visual inspection, as defined in 3.7 of IEC 60974-1:2012; b) insulation resistance, as specified in 6.1.4 of IEC 60974-1:2012 (preliminary check); c
49、) enclosure, as specified in 14.2 of IEC 60974-1:2012; d) handling means, as specified in 14.3 of IEC 60974-1:2012; e) drop withstand, as specified in 14.4 of IEC 60974-1:2012; f) protection provided by the enclosure, as specified in 6.2.1 of IEC 60974-1:2012; g) insulation resistance, as specified in 6.1.4 of IEC 60974-1:2012; h) dielectric strength, as specified in 6.1.5 of IEC 60974-1:2012; i) general visu
