1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 29.180 ISBN 0-626-16216-5 SANS 5826:2004Edition 2ISO 5826:1999Edition 2SOUTH AFRICAN NATIONAL STANDARD Resistance welding equipment Transformers Gene
4、ral specifications applicable to all transformers This national standard is the identical implementation of ISO 5826:1999 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretor
5、ia 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 5826:2004 Edition 2 ISO 5826:1999 Edition 2 Table of changes Change No. Date Scope Abstract Gives specifications applicable to transformers for resistance welding equipment without con
6、nected rectifier. Keywords marking, name plates, resistance-welding equipment, specifications, temperature rise, transformers, welding, welding equipment. National foreword This South African standard was approved by National Committee StanSA TC 5120.08, Welding and allied processes, in accordance w
7、ith procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS edition cancels and replaces the first edition (SABS ISO 5826:1983). AReference numberISO 5826:1999(E)INTERNATIONALSTANDARDISO5826Second edition1999-11-15Resistance welding equipment Transformers
8、 General specificationsapplicable to all transformersMatriel de soudage par rsistance Transformateurs Spcificationsgnrales applicables tous les transformateursISO 5826:1999(E) ISO 1999All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any fo
9、rm or by any means, electronicor mechanical, including photocopying and microfilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 CH-1211 Genve 20 SwitzerlandInternet isoiso.chPrinted in SwitzerlandiiContents Page1 Scope 12 Normative re
10、ferences 13 Terms and definitions .14 Symbols25 Physical environment and operating conditions36 Test conditions 37 Protection against electric shock58 Thermal requirements69 Rated no-load output voltage (U20) 910 Rated short-circuit voltage (Ucc).911 Cooling liquid circuit .912 Dynamic behaviour1013
11、 Rating plate 1014 Instruction manual.12Annex A (informative) Example of a rating plate13Annex B (normative) Corrections for higher altitudes and cooling medium temperatures 14Annex C (normative) Notes on physical concepts and comments on some definitions.15Annex D (normative) Type code 21Bibliograp
12、hy22 ISOISO 5826:1999(E)iiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in
13、 a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission
14、 (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an Intern
15、ational Standard requires approval by at least 75 % of the member bodies casting a vote.International Standard ISO 5826 was prepared by Technical Committee ISO/TC 44, Welding and allied processes,Subcommittee SC 6, Resistance welding.This second edition cancels and replaces the first edition (ISO 58
16、26:1983), which has been technically revised.Annexes B, C and D form a normative part of this International Standard. Annex A is for information only.INTERNATIONAL STANDARD ISO ISO 5826:1999(E)1Resistance welding equipment Transformers Generalspecifications applicable to all transformers1 ScopeThis
17、International Standard give specifications applicable to transformers for resistance welding equipment withoutconnected rectifier.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions ofthis International Standard. For
18、 dated references, subsequent amendments to, or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below. Forun
19、dated references, the latest edition of the normative document referred to applies. Members of ISO and IECmaintain registers of currently valid International Standards.ISO 669, Resistance welding equipment Mechanical and electrical requirements.IEC 60051-2, Direct acting indicating analogue electric
20、al measuring instruments and their accessories Part 2:Special requirements for ammmeters and voltmeters.IEC 60085, Thermal evaluation and classification of electrical insulation.IEC 60204-1, Electrical equipment of industrial machines Part 1: General requirements.IEC 60529, Degrees of protection pro
21、vided by enclosures (IP code).IEC 60536-2, Classification of electrical and electronic equipment with regard to protection against electric shock Part 2: Guidelines to requirements for protection against electric shock.IEC 60664-1, Insulation coordination for equipment within low-voltage systems Par
22、t 1: Principles, requirementsand tests.IEC 60905, Loading guide for dry-type power transformers.3 Terms and definitionsFor the purposes of this International Standard, the terms and definitions given in ISO 669 apply.ISO 5826:1999(E) ISO24 SymbolsThe symbols used in this International Standard are l
23、isted in Table 1.Table 1 List of symbolsSymbol Description ReferenceI1prated permanent input current 10, 12I1Xinput current at a given duty factor annex CI2output current annex CI2ppermanent output current at 100 % duty factor 13.2, annex CI2Xoutput current at a given duty factor annex CI2/50output
24、current at 50 % duty factor 13.2m mass 13.2P power annex CPppermanent input power (at 100 % duty factor) 10, 11, 13.2, annex CPXinput power at a given duty factor annex CP50input power at 50 % duty factor 13.2Q required total rate of cooling liquid flow 11, 13.2R1initial resistance of a winding 8.2.
25、1, 8.3.2R2resistance of a winding at the end of the heating test 8.3.2t time annex Ct1on-load time annex CT cycle time annex CUccrated short-circuit voltage 10U1ccinput short-circuit voltage 10U1Nrated supply voltage 9, 10, 13.2U20rated output no-load voltage 9, 13.2X duty factor annex CXmduty facto
26、r of the magnetic circuit annex CZ2total impedance refered to the output 10Dp pressure drop of the cooling liquid circuit 11, 13.2Du1, 2temperature differences annex Cu temperature annex Cuacooling medium temperature annex Cumequilibrium temperature annex Cuntemperature when the transformer starts t
27、o cool annex Cu0, 1, 2temperatures for calculation of the thermal time constant or thewinding temperatures during the heating test8.2.1, 8.3.2, annex Ct thermal time constant annex Ct2thermal time constant at given on-load time annex Ct2pthermal time constant at permanent output current annex C ISOI
28、SO 5826:1999(E)35 Physical environment and operating conditions5.1 GeneralTransformers shall be suitable for use in the physical environment and operating conditions as specified below.When the physical environment and/or operating conditions are outside those specified below, an agreement maybe nee
29、ded between the supplier and the user, (see e.g. annex B of IEC 60204-1:1997).5.2 Ambient air temperatureTransformers shall be capable of operating correctly in an ambient air temperature between 1 5 C and 1 40 C.In case of other maximum temperatures of the cooling medium, see annex B.5.3 HumidityTr
30、ansformers shall be capable of operating correctly within a relative humidity range of 30 % to 95 %.Harmful effects of occasional condensation shall be avoided by proper design of the equipment or, wherenecessary, by proper additional measures (e.g. air conditioners, drain holes).5.4 AltitudeTransfo
31、rmers shall be capable of operating correctly at altitudes up to 1 000 m above mean sea level.In case of other altitudes, see annex B.5.5 Transportation and storageTransformers shall be designed to withstand, or suitable precautions shall be taken to protect against, transportationand storage temper
32、atures between 2 25 C and 1 55 C and for short periods not exceeding 24 h up to 1 70 C.Suitable means shall be provided to prevent damage from humidity, vibration and shock.5.6 Provisions for handlingTransformers shall be provided with suitable means for handling by cranes or similar equipment.5.7 T
33、emperature of the cooling liquidThe temperature of the cooling liquid may be up to 1 30 C at the inlet of the transformer.NOTE Condensation caused by high cooling liquid flow or low cooling liquid temperature in relation to the relative humidityshould be prevented.6 Test conditions6.1 GeneralThe tes
34、ts shall be carried out on new, dry and completely assembled transformers at an ambient air temperaturebetween 1 10 C and 1 40 C. The ventilation shall be identical with that prevailing under normal serviceconditions. When placing the measuring devices, the only access permitted shall be through ope
35、nings with coverplates, inspection doors or easily removable panels provided by the manufacturer. The measuring devices usedshall not interfere with the normal ventilation of the transformer or cause transfer of heat to or from it.Liquid cooled transformers shall be tested with liquid conditions as
36、specified by the manufacturer.ISO 5826:1999(E) ISO4The accuracy of measuring instruments shall be:a) electrical measuring instruments: Class 0,5 (0,5 % full scale, see IEC 60051-2);b) thermometer: 2 K.Unless otherwise specified, the tests required in this International Standard are type tests.The se
37、quence for some of the type tests is specified in 6.2.The routine tests are specified in 6.3.Compliance with other standards referred to shall be checked according to these standards.6.2 Type testsAll type tests shall be carried out on the same transformer except otherwise specified.Those type tests
38、 given below shall be carried out in the following sequence without delay between f), g), h) and i).a) General visual inspection;b) Insulation resistance (see 7.1) preliminary check;c) Thermal rating (see clause 8);d) Rated short-circuit voltage (see clause 10);e) Protection provided by the enclosur
39、e (see 7.3.1);f) Insulation resistance (see 7.1);g) Dielectric strength (see 7.2);h) Dynamic characteristic (see clause 12);i) General visual inspection.The other tests of this International Standard not mentioned above may be carried out in any convenient sequence.NOTE The preliminary check on insu
40、lation resistance is required to determine whether the transformer is safe to connectto the supply.6.3 Routine testsEach transformer shall be submitted successively to the following routine tests.a) General visual inspection;b) Dielectric strength (see 7.2);c) Rated no-load output voltage (see claus
41、e 9);d) Cooling liquid circuit (see clause 11);e) General visual inspection. ISOISO 5826:1999(E)57 Protection against electric shock7.1 Insulation resistanceThe insulation resistance shall not be less than 50 MV.Compliance is checked by measuring the insulation resistance using a d.c. voltage of 500
42、 V betweena) the input and output windings andb) the windings and the frame.7.2 Dielectric strength (routine test)The insulation shall withstand the following test voltages without any flashover or breakdown and no damage shalloccur which might impair the function of the insulation.Compliance is che
43、cked according to IEC 60664-1 and the following test.An a.c. voltage, having the frequency of the mains supply, of:a) 4 000 V r.m.s. for integrated gun transformers andb) 2 500 V r.m.s. for all other transformersis applied between the inlet and one winding of the outlet circuit, of class I or class
44、II transformers. However, if thedesign of class I is so that one point of the secondary is connected to earth, the test voltage can be decreased to2 500 V r.m.s.An a.c. voltage of 1 000 V r.m.s. having the same shape is applied between one winding of the outlet circuit andearth.The 1 000 V test volt
45、age shall be applied instantaneously.The 2 500 V and 4 000 V test voltages shall be applied progressively so that the prescribed value is reached inabout 20 s.In both cases, the test voltage shall be continuously maintained at the required value for 60 s, then stopped asquickly as the equipment allo
46、ws, without creating overvoltage during stopping.NOTE Dielectric tests shall not normally be repeated on a same transformer. If, for any reason, they should be, they shouldbe tested again with a test voltage of only 75 % of the above-mentioned values.7.3 Protection against electric shock in normal s
47、ervice (direct contact)The minimum degree of protection for transformers provided by the enclosure shall be IP 54 as specified inIEC 60529.If the transformer is intended to be in-built, the degree of protection may be IP 00.Compliance is checked according to IEC 60529.7.4 Protection against electric
48、 shock in case of a fault condition (indirect contact)Transformers shall be built to protection class I or II according to IEC 60536-2.Compliance is checked by visual inspection.ISO 5826:1999(E) ISO67.5 Isolation of input and output circuitsThe welding circuit shall be electrically isolated from the
49、 input circuit and from all other circuits having a voltagehigher than the no-load voltage by reinforced or double insulation. If another circuit is connected to the outputcircuit, the power of the other circuit shall be supplied by an isolating transformer or equivalent means.Compliance is checked by visual inspection of the design.8 Thermal requirements8.1 Limits of temperature riseThe thermal requirements for transformers are given as follows:a) for windings: in accordance with 8.1.1;b) for accessible surfaces: in accordance wit
