1、17657-3:2007)g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58resistance welding Part 3: Current sensing coilThe European Standard EN ISO 17657-3:200
2、7 has the status of a British StandardICS 25.160.10Resistance welding Welding current measurement for BRITISH STANDARDBS EN ISO 17657-3:2007Incorporating amendment no. 1 (renumbers BS ISO 17657-3:2005 as BS EN ISO BS EN ISO 17657-3:2007This British Standard was published under the authority of the S
3、tandards Policy and Strategy Committee on 17 January 2006 BSI 2007ISBN 978 0 580 59705 3Amendments issued since publicationAmd. No. Date Comments17297 31 August 2007 Renumbers BS ISO 17657-3:2005 as BS EN ISO 17657-3:2007Compliance with a British Standard cannot confer immunity from legal obligation
4、s.National forewordThis British Standard is the UK implementation of EN ISO 17657-3:2007. It is identical with ISO 17657-3:2005.The UK participation in its preparation was entrusted to Technical Committee WEE/29, Resistance welding. A list of organizations represented on this committee can be obtain
5、ed 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. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 17657-3June 2007ICS 25.160.10English VersionResistance welding - Welding cu
6、rrent measurement forresistance welding - Part 3: Current sensing coil (ISO 17657-3:2005)Soudage par rsistance - Mesurage des courants ensoudage par rsistance - Partie 3: Tore de mesure decourant (ISO 17657-3:2005)Widerstandsschweien - Schweistrommessung fr dasWiderstandsschweien - Teil 3: Strommess
7、spule (ISO17657-3:2005)This European Standard was approved by CEN on 19 May 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bi
8、bliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility
9、of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Irelan
10、d, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-
11、1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 17657-3:2007: EForeword The text of ISO 17657-3:2005 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organi
12、zation for Standardization (ISO) and has been taken over as EN ISO 17657-3:2007 by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,
13、 at the latest by December 2007, and conflicting national standards shall be withdrawn at the latest by December 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, B
14、ulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text
15、of ISO 17657-3:2005 has been approved by CEN as a EN ISO 17657-3:2007 without any modification. EN ISO 17657-3:2007Reference numberISO 17657-3:2005(E)INTERNATIONAL STANDARD ISO17657-3First edition2005-09-15Resistance welding Welding current measurement for resistance welding Part 3: Current sensing
16、coil Soudage par rsistance Mesurage des courants en soudage par rsistance Partie 3: Tore de mesure de courant EN ISO 17657-3:2007ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Physical environment and operating conditions 2 5 Classi
17、fication of current sensing coils and designation of product . 2 5.1 Class of current sensing coils. 2 5.2 Standard values of the conversion coefficient 2 5.3 Designation of products. 3 6 Requirements for current sensing coils. 3 6.1 Current sensing coil and connecting lead . 3 6.2 Conversion coeffi
18、cient . 3 6.3 Measuring accuracy . 4 6.4 Mechanical strength . 4 6.5 Setting position error . 4 6.6 Influence of ambient temperature . 4 6.7 Thermal property of cover materials 4 6.8 Test. 4 7 Test procedures 5 7.1 Conversion coefficient . 5 7.2 Measuring accuracy . 6 7.3 Mechanical tests . 6 7.4 Se
19、tting position error test 8 7.5 Thermal test. 8 7.6 Contact test . 8 8 Marking 8 Annex A (informative) Design of current sensing coils . 9 Annex B (informative) Governing parameters of the conversion coefficient 12 Annex C (informative) Type of current sensing coils and their recommended specificati
20、on range. 13 Annex D (informative) Frequency response of current sensing coils 17 EN ISO 17657-3:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norma
21、lly carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in th
22、e work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare
23、International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some
24、of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17657-3 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 6, Resistance welding. ISO 17657 consists of
25、 the following parts, under the general title Resistance welding Welding current measurement for resistance welding: Part 1: Guidelines for measurement Part 2: Welding current meter with current sensing coil Part 3: Current sensing coil Part 4: Calibration system Part 5: Verification of welding curr
26、ent measuring system EN ISO 17657-3:2007vIntroduction Requests for official interpretations of any aspect of this part of ISO 17657 should be directed to the Secretariat of ISO/TC 44/SC 6 via your national standards body. A complete listing of these bodies can be found at http:/www.iso.org. EN ISO 1
27、7657-3:2007blank1Resistance welding Welding current measurement for resistance welding Part 3: Current sensing coil 1 Scope This part of ISO 17657 specifies current sensing coils of the toroidal-coil type as a current sensor for welding current meters or a welding current measuring system used to mo
28、nitor the welding current in resistance welding, and is applicable for both current types, i.e. alternating current of 50 Hz or 60 Hz and direct current. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the e
29、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requirements ISO 17657-4, Resistance welding Welding current measurement for resistance w
30、elding Part 4: Calibration system 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 669 and the following apply. 3.1 current sensing coil (toroidal coil) multi-wound coil, in which wire is wound around a non-magnetic core of constant cross-section, use
31、d for detecting the magnetic flux generated by current NOTE The coil is mounted around or encircles a conductor through which the current to be measured passes. 3.2 reference current sensing coil current sensing coil calibrated at a higher accuracy than the highly accurate class defined in this part
32、 of ISO 17657 3.3 conversion coefficient ratio of output voltage from a current sensing coil against the welding current, expressed in millivolts per kiloamp (mV/kA) NOTE The value is proportional to the frequency of the measured current, and is defined with a perfectly full-wave current of 50 Hz as
33、 the test current. EN ISO 17657-3:20072 3.4 frequency response feature indicating the influence of frequency of test current on the conversion coefficient 3.5 accuracy scatter and deviation of the conversion coefficient NOTE The output load of the current sensing coil strongly influences the value o
34、f the conversion coefficient. If the output load and/or input impedance of an integrator changes, the conversion coefficient may deviate even though both devices have been separately calibrated in a highly accurate class. 4 Physical environment and operating conditions Unless otherwise specified, th
35、e current sensing coil shall be capable of operating under the following conditions: at an ambient air temperature between +5 C and +40 C; in relative humidity up to 95 %; at altitudes up to 1 000 m above mean sea level; where gas, fine dust, oil mist, spatters, etc. are included in the air such as
36、those caused by ordinary arc or spot welding work. When the operating conditions are not of any of those specified above, an agreement may be needed between the manufacturer and the purchaser. 5 Classification of current sensing coils and designation of product 5.1 Class of current sensing coils The
37、 current sensing coils shall be classified depending on construction, conversion coefficient and measuring accuracy. Classifications by the accuracy are shown in Table 1. Table 1 Classification of current sensing coils Classification Measuring accuracy Application Highly accurate class 0,5 % of full
38、 scale Laboratory use Accurate class 1,0 % of full scale Routine use for highly accurate systems Ordinary class 3,0 % of full scale Routine use for ordinary systems 5.2 Standard values of the conversion coefficient Rated values of the standard conversion coefficient, K, shall be of 150 mV/kA, 220 mV
39、/kA and 1,5 V/kA for full-wave alternating current of 50 Hz. NOTE If a different test frequency is used for defining the conversion coefficient, the value can be converted by using equation (1) described in 7.1. EN ISO 17657-3:200735.3 Designation of products The following shall be indicated: design
40、 type as designated by type of construction; conversion coefficient; specified accuracy class; coil size (length for flexible type, and inner diameter for rigid type). The designation of length can be omitted if the value is not needed. EXAMPLE 1 Flexible type of 800 mm length, conversion coefficien
41、t of 150 mV/kA at 50 Hz, and accurate class. Flexible (800 mm) 150 mV/kA, 50 Hz, class 1.0 EXAMPLE 2 Rigid type of 200 mm inner diameter, conversion coefficient of 180 mV/kA at 60 Hz, and highly accurate class. Rigid (200 mm) 180 mV/kA, 60 Hz, class 0.5 6 Requirements for current sensing coils 6.1 C
42、urrent sensing coil and connecting lead The current sensing coil, connector and connecting lead from the coil to the integrator/amplifier shall be designed such that the coil is sensitive only to magnetic flux generated by current flow through the conductor within the coil. Any external magnetic flu
43、x across the coil is not measured. The output of the coil is proportional to a derivative of the measured current waveform. If a flexible or rigid hatched-type coil is used, both ends of the sensing coil shall be fixed leaving little or no space between the ends. To avoid wave distortion, the connec
44、ting lead and connector should be protected from magnetic flux and should have low inductance. A low inductive resistance shall be connected to the ends of the connecting lead as the output load, RL. The value should be constant between 200 and 1 k. 6.2 Conversion coefficient The rated conversion co
45、efficient of current sensing coils should conform with those described in 5.2. The values shall be checked, and adjusted according to the method described in 7.1 using full-wave currents. The scatter of the conversion coefficient shall be checked using a reference current meter and data acquisition
46、system, or a reference current sensing coil and a data acquisition system. The correction shall be performed by inserting a small resistance, ra, in the end of coil or the end of connection lead as shown in Figure A.1. The coefficient value should not be adjusted by controlling the value of the outp
47、ut load RL. If the coils are checked with an alternating current of 60 Hz, the value shall be divided by 1,2 (= 60/50) to get the conversion coefficient in 50 Hz. The input impedance of an integrator, connected to the current sensing coil, influences the value of conversion coefficient. The output v
48、oltage should be measured with a high-input impedance device larger than 500 k as for the data acquisition system, with the output load specified in 6.1 connected if the coil does not include a resistor. The conversion coefficient values for an alternating current of 60 Hz can be checked and adjuste
49、d although the value is indicated in 50 Hz. In the case of an alternating current of 60 Hz, the conversion coefficient marked on the coil is calculated according to Equation (1) described in 7.1. EN ISO 17657-3:20074 6.3 Measuring accuracy The measuring accuracy of current sensing coils shall be one shown in Table 1, and shall be checked according to the method described in 7.2 using full-wave alternating currents of 50 Hz or 60 Hz. NOTE Current sensing coils with a small deviation of less than 1 % can be manuf
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