1、BRITISH STANDARD BS 4819-1: 1989 ISO 7284:1984 Resistance welding water-cooled transformers of the press package and portable types Part 1: Specification for press-package transformers ISO title: Resistance welding equipment Particular specifications applicable to transformers with two separate seco
2、ndary winding for multi-spot welding as used in the automobile industry UDC 621.314.21:621.791.763BS4819-1:1989 This British Standard, having been prepared under the directionof the Welding Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31January198
3、9 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference WEE/26 Draft for comment 82/72479 DC ISBN 0 580 16080 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Welding Standards Committee (WEE/
4、-) to Technical Committee WEE/26, upon which the following bodies were represented: Association of Supervisory and Executive Engineers British Non-ferrous Metals Federation British Steel Industry British Telecommunications plc Copper Development Association Electricity Supply Industry in England and
5、 Wales Health and Safety Executive Society of British Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Welding Institute Welding Manufacturers Association (BEAMA Ltd.) Coopted members Amendments issued since publication Amd. No. Date of issue CommentsBS4819-1:1989 BSI 1
6、1-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Types of transformers 1 4 Positions of the rotary switch 1 5 Dimensions 1 6 Construction 4 7 Tests 5 8 Designation 5 Annex Cable input for the primary connection
7、6 Figure 1 Positions of the rotary switch 2 Figure 2 Dimensions and arrangement of secondary connections 3 Figure 3 Dimensions of the separate rotary switch position (position 6) Position of the handle 4 Figure 4 Dimensions of the plates for transformers 6 Figure 5 Dimensions of the plate for rotary
8、 switch 7 Figure 6 Dimensions of plug and socket device 8 Table 1 Types of transformers, electrical characteristics 1 Table 2 Dimensions l 1 , l 2and l 3 , in millimetres, as a function of the secondary permanent current 3 Table 3 Limit values of the no-load current, l 0 5 Table 4 Dimensions of the
9、conduits 6 Publications referred to Inside back coverBS4819-1:1989 ii BSI 11-1999 National foreword This Part of BS4819, which has been prepared under the direction of the Welding Standards Committee, supersedes part of BS4819:1972. It is identical with ISO7284:1984 “Resistance welding equipment Par
10、ticular specifications applicable to transformers with two separate secondary windings for multi-spot welding, as used in the automobile industry”, published by the International Organization for Standardization (ISO). It is one of a series of covering standards resistance welding equipment and asso
11、ciated accessories. The present edition of BS4819 has been divided into the following two Parts, for ease of use: Part 1: Specification for press-package transformers; Part 2: Specification for portable transformers. For the purposes of this Part of BS4819 the designation statement required by itema
12、) of clause8 is replaced by the following: a) the reference to this Part of BS4819, i.e.BS4819-1; In the example the designation then reads: “Transformer BS4819-1-B-1-7, 1-45-380”. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a
13、British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the bas
14、eline as the decimal marker. It is also current practice to use the symbol “L” for litre, rather than “l”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Part of BS4819”. The Technical Committee has reviewed the provisions of ISO5826, to which
15、 reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. It is intended to implement ISO5826 as an identical British Standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standa
16、rds are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 669:1981 BS 3065:1982 Specification for rating of resistance welding equipment (
17、Identical) IEC 423:1973 BS 6053:1981 Specification for outside diameters of conduits for electrical installations and threads for conduits and fittings Technically equivalent to IEC423 and IEC423A (Supplement) Summary of pages This document comprises a front cover, an inside front cover, pages i and
18、 ii, pages1 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4819-1:1989 BSI 11-1999 1 1 Scope and field of application The purpose of th
19、is International Standard is to give specific details or to complement ISO5826, which deals with general specifications applicable to all transformers, relating to particular transformers within its field of application. Unless otherwise specified, those requirements of ISO5826 not modified by this
20、International Standard are applicable. This International Standard applies to transformers with two separate secondary windings for electric resistance welding machines for multi-spot welding as used in the automobile industry. NOTEBy agreement between the manufacturer and the user, this Internation
21、al Standard may also be applied to those transformers for multi-spot welding used in other industries or for other types of welding machines where possible. ISO5826 is applicable in all cases. 2 References ISO 669, Rating of resistance welding equipment. ISO 5826, Transformers for resistance welding
22、 machines General specifications applicable to all transformers. IEC Publication 423, Outside diameters of conduits for electrical installations and threads for conduits and fittings. 3 Types of transformers This International Standard covers the following types of transformers which are characteriz
23、ed by the secondary no-load voltage U 20 , the secondary permanent current I 2pand, for information, by continuous output S pand/or the rated power at the duty factor50% (S 50 ) (seeTable 1). Transformers may have a control switch or not for the secondary no-load voltage U 20 . The power on which th
24、e definition of the transformer type is based is the primary power, i.e.the sum of the powers of both the secondary windings. Table 1 Types of transformers, electrical characteristics NOTE 1The selection of the secondary voltage is made on the primary side by means of a rotary switch or a set of con
25、nectors. In the following clauses, only rotary switch assemblies are shown. NOTE 2For requirements concerning the secondary permanent current I 2pand the secondary no-load voltage U 20 , seeISO5826. 4 Positions of the rotary switch The rotary switch shall be either on the transformer according to on
26、e of the five positions shown inFigure 1 or separated from the transformer (position6). 5 Dimensions 5.1 Transformers The dimensions of the transformers shall be as given inFigure 2 and Table 2. 5.2 Rotary switch The dimensions of the rotary switch when it is separate from the transformer shall be a
27、s given inFigure 3. U 20without steps U 20with steps I 2p S p S 50 V V kA kVA kVA Position 5,0 1 2 3 4 3,0 3,6 4,2 5,0 5,6 28 40 7,1 1 2 3 4 5,0 5,6 6,3 7,1 6,3 45 63 10,0 1 2 3 4 7,1 8,0 9,0 10,0 7,1 71 100BS4819-1:1989 2 BSI 11-1999 Figure 1 Positions of the rotary switchBS4819-1:1989 BSI 11-1999
28、3 Figure 2 Dimensions and arrangement of secondary connectionsBS4819-1:1989 4 BSI 11-1999 6 Construction 6.1 Secondary connections The arrangement and dimensions of the secondary connections shall be as given inFigure 2 and Table 2. 6.2 Cooling water circuit The cooling water circuit shall ensure ef
29、fective cooling of the transformer for a nominal water flow of4l/min and the incoming cooling water shall be at a maximum temperature of30 C 1) . It shall be leakproof at a pressure of10bar 2) . For the said water flow, the pressure drop shall be not more than0,6bar. 6.3 Rotary switch 6.3.1 The rota
30、ry switch has five steps of which four are active and one a zero step. The rotary switch shall be designed so as to a) allow rapid transition from one step to another; b) allow positive positioning at each step; c) block direct transition from step4 to step0. 6.3.2 The direction of rotation for volt
31、age increase shall be clockwise. 6.3.3 The torque necessary for switch rotation shall not be greater than6Nm. The length of the lever shall be approximately80mm. 6.3.4 The cover of the switch shall be so designed that the control lever is protected and so that an accumulation of liquid which could l
32、eak into the transformer is avoided. 6.3.5 The control switch shall hold any position indicated in clause4 equally well. 6.4 Primary connections 6.4.1 Cables and terminals Cables used for primary connections and terminals shall be appropriate to the primary current which may flow and in accordance w
33、ith the requirements of the relevant IECPublications. 6.4.2 Cable input For the transformers, the cable input into the transformer and the rotary switch shall be planned according to one of the methods given in the Annex. The position of the threaded holes for the cable input into the transformer sh
34、all be as shown inFigure 2. 6.5 No-load current The value of the no-load current shall not be greater than the values given inTable 3. NOTEAll sizes are overall, including any allowance necessary for primary inputs, see6.4.2. Figure 3 Dimensions of the separate rotary switch (position 6) Position of
35、 the handle 1) Value in accordance with ISO5826. 2) 1 bar = 100 kPa, 1 Pa = 1 N/m 2BS4819-1:1989 BSI 11-1999 5 Table 3 Limit values of the no-load current, I 0 7 Tests Transformers covered by this International Standard shall be tested in accordance with the requirements of ISO5826. 8 Designation Tr
36、ansformers covered by this International Standard are designated by noting in order: a) the reference to this International Standard; b) the arrangement of the secondary connections (seeFigure 2); c) the position of the rotary switch (seeclause 4); 3) d) the secondary no-load voltage U 20(seeTable 1
37、); e) the continuous output S p(seeTable 1); f) the primary voltage. Example: Transformer ISO 7284-B-1-7,1-45-380 I 2p kA U 1 V S p kVA S 50 kVA S o kVA 220 380 415 500 550 660 I 0 A 5,6 25,5 14,7 13,5 11,2 10,2 8,5 28 40 5,60 6,3 37,2 21,6 19,7 16,4 14,9 12,4 45 63 8,20 7,1 45,5 26,3 24,1 20,0 18,2
38、 15,2 71 100 10,00 3) If there is no rotary switch, 0 shall be indicated for transformers without controls and7 for transformers with control of the secondary voltage by means of a set of connectors.BS4819-1:1989 6 BSI 11-1999 Annex Cable input for the primary connection A.1 Transformers Two alterna
39、tives are possible. A.1.1 One or two threaded holes are made on each of the four sides of the transformer, as indicated inFigure 2. The hole used are fitted with a conduit for the cable; the others are blocked by means of a special screw the sizes of which are given inTable 4. A.1.2 An opening is ma
40、de on all four sides of the transformer. Each of these openings is covered by a plate one or more, of which has a hole for the passage of a cable conduit. The others are without holes. Dimensions of such plates are given inFigure 4. The openings shall be made so that the hole is positioned, as indic
41、ated inFigure 2. Conduit sizes are given inTable 4. A.2 Rotary switch Three alternatives are possible. A.2.1 Four openings are made in the cover of the switch, as shown inFigure 4. These openings are covered by plates with or without a cable conduit, asindicated inA.1.1. The sizes of the plates are
42、given inFigure 5; the conduit size is40mm in accordance with IEC423. A.2.2 A threaded hole is drilled into the surface of the switch with the lever. The opposite side of the switch is formed by a detachable plate. A.2.3 Connection is made on the lever surface of the switch by means of a plug and soc
43、ket device, the dimensions of which are given inFigure 6. The alternative is only possible where the current is less than or equal to200A. Table 4 Dimensions of the conduits I 2p kA Thread of steel conduit according to IEC 423 Conductors 1 3 Nominal size mm 5,6 32 50 6,3 40 50 7,1 40 50 Figure 4 Dim
44、ensions of the plates for transformersBS4819-1:1989 BSI 11-1999 7 Figure 5 Dimensions of the plate for rotary switchBS4819-1:1989 8 BSI 11-1999 Figure 6 Dimensions of plug and socket deviceBS4819-1:1989 BSI 11-1999 Publications referred to See national foreword.BS 4819-1: 1989 ISO 7284:1984 BSI 389
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