1、 IEC 62135-1 Edition 2.0 2015-05 INTERNATIONAL STANDARD Resistance welding equipment Part 1: Safety requirements for design, manufacture and installation IEC 62135-1:2015-05(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless
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11、ture and installation INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 25.160 ISBN 978-2-8322-2664-3 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 62135-1:2015 IEC 2015 CONT
12、ENTS FOREWORD . 6 1 Scope 8 2 Normative references 8 3 Terms and definitions 9 4 Environmental conditions . 11 5 Tests . 11 5.1 Test condition . 11 5.2 Measuring instruments 11 5.3 Type tests . 12 5.4 Routine tests. 12 6 Protection against electric shock . 12 6.1 General . 12 6.2 Insulation 13 6.2.1
13、 General . 13 6.2.2 Clearances 13 6.2.3 Creepage distances . 14 6.2.4 Insulation resistance 16 6.2.5 Dielectric strength 16 6.2.6 Welding circuit touch current . 18 6.2.7 Liquid cooling 18 6.3 Protection against electric shock in normal service (direct contact) . 19 6.3.1 General . 19 6.3.2 Rated no
14、-load voltage at the output . 19 6.3.3 Protection provided by barriers or the enclosure 20 6.3.4 Capacitors . 21 6.3.5 Automatic discharge of input capacitors . 21 6.3.6 Protective conductor current under normal condition 22 6.3.7 Touch current in normal condition 22 6.4 Protection against electric
15、shock in case of a fault condition (indirect contact) 22 6.4.1 General . 22 6.4.2 Protective provisions for welding circuit . 24 6.4.3 Internal conductors and connections 36 6.4.4 Touch current in fault condition 36 6.4.5 DC resistance welding equipment operating at mains frequency 37 6.4.6 DC resis
16、tance welding equipment operating at medium frequency . 37 6.4.7 Continuity of the protective bonding circuit 37 6.5 Additional user requirements. 38 6.6 Supply voltage 38 6.7 Conductors of the welding circuit 38 7 Thermal requirements 38 7.1 Heating test 38 7.1.1 Test conditions 38 7.1.2 Tolerances
17、 of the test parameters . 39 7.1.3 Beginning of the heating test . 40 7.1.4 Duration of the test 40 IEC 62135-1:2015 IEC 2015 3 7.2 Temperature measurement . 40 7.2.1 Measurements conditions 40 7.2.2 Surface temperature sensor . 40 7.2.3 Resistance 40 7.2.4 Embedded temperature sensor 41 7.2.5 Deter
18、mination of the ambient temperature (t a ) . 41 7.2.6 Determination of cooling liquid temperature (t a ) . 41 7.2.7 Recording of temperatures 41 7.3 Limits of temperature rise . 42 7.3.1 Windings . 42 7.3.2 External surfaces . 42 7.3.3 Other components . 44 7.4 Protection from thermal hazards in nor
19、mal service (direct contact) 44 7.4.1 General . 44 7.4.2 Identification of hot surfaces 44 7.4.3 Protection provided by insulation or other barriers . 45 7.4.4 Protection provided by supplemental cooling . 45 8 Abnormal operation . 45 8.1 General requirements . 45 8.2 Stalled fan test 45 8.3 Cooling
20、 system failure . 45 8.4 Overload test 46 9 Provisions against mechanical hazards . 46 9.1 General . 46 9.2 Risk analysis. 46 9.2.1 General . 46 9.2.2 Ready-to-use equipment as in delivery state 46 9.2.3 Equipment not ready to use as in delivery state . 46 9.2.4 Equipment not ready for use and desig
21、ned to be incorporated in more complex equipment 47 9.3 Measures 47 9.3.1 Minimum measures 47 9.3.2 Additional measures 47 9.4 Conformity of components 48 9.5 Starting for manual operated equipment 48 10 Instructions and markings 49 10.1 Instructions . 49 10.2 Markings . 49 10.3 Marking of terminals
22、 . 49 Annex A (informative) Nominal voltages of supply networks . 51 Annex B (normative) Construction of supply circuit terminals . 52 B.1 Size of terminals . 52 B.2 Spacings between supply circuit terminals 52 B.3 Connections at the terminals . 53 B.4 Construction of the terminals 53 B.5 Fixing of
23、the terminals . 53 Annex C (normative) Touch current measurement in fault condition . 54 Annex D (informative) Extrapolation of temperature to time of shutdown 56 4 IEC 62135-1:2015 IEC 2015 Annex E (informative) Example of risk analysis and safety level requirement . 57 E.1 General . 57 E.2 Monitor
24、ed hazards 57 E.3 General measures 57 E.4 Typical hazards by type of equipment . 57 E.4.1 General . 57 E.4.2 Spot welding 58 E.4.3 Projection welding . 59 E.4.4 Seam welding 60 E.4.5 Butt welding . 60 Annex F (informative) Indirect contact protection in resistance welding equipment . 61 F.1 Protecti
25、on against indirect contact by automatic disconnection of the supply 61 F.1.1 General . 61 F.1.2 TN system . 61 F.1.3 TT systems 62 F.2 Automatic disconnection of supply in single phase a.c. current equipment 63 F.2.1 TN system . 63 F.2.2 TT systems 64 F.3 Automatic disconnection of supply in d.c. c
26、urrent equipment operating at medium frequency (inverter equipment) 64 F.3.1 TN system . 64 F.3.2 TT systems 65 Bibliography 68 Figure 1 Measurement of welding circuit touch current . 18 Figure 2 Measurement of rms values . 19 Figure 3 Example of metal screen between windings of the supply circuit a
27、nd the welding circuit . 26 Figure 4 Example of protective conductor connected directly to the welding circuit (single-spot, a.c. current equipment) . 27 Figure 5 Example of protective conductor connected directly to welding circuits (multi-spot, a.c. current equipment) 27 Figure 6 Example of protec
28、tive conductor connected directly to welding circuits (medium-frequency equipment) . 28 Figure 7 Example of protective conductor connected to welding circuits through impedances 29 Figure 8 Example of protective conductor connected to welding circuits through auto-inductances 30 Figure 9 Example of
29、protective conductor connected to welding circuits through auto-inductances 30 Figure 10 Example of current operated RCD (a.c. current equipment) 31 Figure 11 Example of current operated RCD (medium-frequency equipment) . 32 Figure 12 Example of current operated residual current device and voltage r
30、elay . 33 Figure 13 Example of current operated residual current device and safety-voltage relay . 34 Figure 14 Example of safety voltage relay 35 Figure C.1 Measuring network for weighted touch current 54 IEC 62135-1:2015 IEC 2015 5 Figure C.2 Diagram for touch current measurement on fault conditio
31、n at operating temperature for single-phase connection of appliances other than those of class II . 55 Figure C.3 Diagram for touch current measurement on fault condition for three- phase four-wire system connection of appliances other than those of class II . 55 Figure E.1 Structure of a mounted ma
32、chine . 58 Figure E.2 Structure of a hand-held welding gun 58 Figure E.3 Structure of projection welding machinery . 59 Figure E.4 Structure of seam welding machinery 60 Figure E.5 Structure of butt welding machinery 60 Figure F.1 Principle illustration of insulation fault . 61 Figure F.2 Illustrati
33、ons of TN systems 62 Figure F.3 Illustrations of TT systems 63 Figure F.4 Typical fault current 65 Figure F.5 Time-to-voltage reference curve 67 Table 1 Minimum clearances for overvoltage category III . 13 Table 2 Minimum creepage distances 15 Table 3 Insulation resistance . 16 Table 4 Dielectric te
34、st voltages 17 Table 5 Minimum distance through insulation . 25 Table 6 Continuity of the protective bonding circuit 37 Table 7 Limits of temperature rise for windings 42 Table 8 Limits of temperature rise for external surfaces of hand-held equipment. 43 Table 9 Limits of temperature rise for extern
35、al surfaces of hand-guided equipment . 43 Table 10 Limits of temperature rise for external surfaces of fixed equipment 43 Table B.1 Range of conductor dimensions to be accepted by the supply circuit terminals . 52 Table B.2 Spacing between supply circuit terminals . 53 6 IEC 62135-1:2015 IEC 2015 IN
36、TERNATIONAL ELECTROTECHNICAL COMMISSION _ RESISTANCE WELDING EQUIPMENT Part 1: Safety requirements for design, manufacture and installation FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committ
37、ees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical R
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47、tent rights. International Standard IEC 62135-1 has been prepared by IEC technical committee 26: Electric welding. This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical ch
48、anges with respect to the previous edition: creepage distances for pollution degree 4 are no longer valid (see Table 2); insulation requirements for Class II equipment are defined (see Table 3); dielectric test voltage interpolation restriction lower limit is changed to 220 V and interpolation for c
49、ontrol and welding circuit is clarified (see Table 4); maximum temperature for insulation systems are reviewed in accordance with current edition of IEC 60085 (see Table 7); IEC 62135-1:2015 IEC 2015 7 marking of terminals is defined (see 10.3); table for nominal voltages of supply networks is changed adopting Table B.2 of IEC 60664-1:2007 in place of the Table B.1 values referenced in the previous edition to provide for equipment to be co
