1、BRITISH STANDARD BS5992-4: 1983 IEC255-14: 1981 Electrical relays Part4: Specification for contact loads of preferred values used in endurance tests for electrical relay contacts UDC 621.318.5:621:3.016.3:620.169.1BS5992-4:1983 This BritishStandard, having been prepared under the directionof the Gen
2、eral Electrotechnical Engineering Standards Committee was published under the authority ofthe Board of BSI and comesintoeffect on 29April1983 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference GEL/5 Drafts for comment78/27037 80/22638 ISBN 0 580 11943 2
3、 Committees responsible for this BritishStandard This BritishStandard was published under the direction of the General Electrotechnical Engineering Standards Committee GEL/-. Its preparation was entrusted to Technical Committee GEL/5 upon which the following bodies were represented: BEAMA Transmissi
4、on and Distribution Association British Telecommunications Electricity Supply Industry in England and Wales Electronic Components Industry Federation Institution of Electrical Engineers Ministry of Defence Telecommunication Engineering and Manufacturing Association (TEMA) The following bodies were a
5、lso represented in the drafting of the standard, through subcommittees and panels: Association of Consulting Engineers Association of Control Manufacturers TACMA (BEAMA) Association of Manufacturers Allied to the Electrical and Electronic Industry(BEAMA) Cinematograph Exhibitors Association of Great
6、 Britain and Ireland Control and Automation Manufacturers Association (BEAMA) Electronic Engineering Association ERA Technology Ltd Greater London Council National Supervising Inspectorate Society of British Aerospace Companies Limited South of Scotland Electricity Board Amendments issued since publ
7、ication Amd. No. Date of issue CommentsBS5992-4:1983 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Section 1. General and definitions 1 General 1 1.1 Scope and object 1 1.2 General requirements 1 2 Terms and definitions 1 2.1 Application category of conta
8、cts 1 3 Standard values 2 3.1 Application categories of contacts 2 Section 2. Standard values for categories0 and1 4 Contact loads 2 4.1 D.C. and a.c. (50Hz or60Hz) resistive loads 2 4.2 D.C. inductive loads 3 4.3 Capacitive load 3 4.4 D.C. relay load 3 4.5 D.C. open-ended cable loads (floating cabl
9、e) 4 4.6 D.C. cable loads combined with resistive load 4 4.7 D.C. cable load combined with relay load 5 Section 3. Standard values for categories2 and3 5 Contact loads 6 5.1 D.C. and a.c. (50Hz, 60Hz or400Hz) resistive loads 6 5.2 Inductive loads 7 5.3 Capacitive loads 8 5.4 Relay load 8 Figure 1 Re
10、sistive load circuit R 1 : seeTable III. R 2 U 50k7 2 Figure 2 D.C. relay load. R 1 : seeSub-clause4.1. R 2 U 50k7 3 Figure 3 D.C. open-ended cable load. R 1 U 10k7. R 2 U 50k7 4 Figure 4 D.C. cable load combined with resistive load. R 1 : see Sub-clause4.1. R 2 U 50k7 5 Figure 5 D.C. cable load com
11、bined with relay load. R 1 : see Sub-clause4.1. R 2 U 50k7 5 Figure 6 Test circuit 8 Table I Application categories (steady-state values, r.m.s., when a.c.) 2 Table II Reactance limits for the circuit of Figure 2 3 Table III Preferred resistive loads 3 Table IV Preferred open-ended cable loads 4 Tab
12、le V Preferred combined cable and resistive loads 5 Table VI Resistive loads 6 Table VII D.C. Inductive loads 7 Table VIII A.C. inductive loads without inrush current variation 7 Table IX A.C. inductive loads with inrush current variation 8 Publications referred to Inside back coverBS5992-4:1983 ii
13、BSI 12-1999 National foreword This Part of this BritishStandard, which has been prepared under the direction of the General Electrotechnical Engineering Standards Committee, is identical with IEC Publication255-14 “Electrical relays, Part14 Endurance test for electrical relay contacts Preferred valu
14、es for contact loads”, published in1981 by the International Electrotechnical Commission (IEC). Those Parts of IEC Publication255 “Electrical relays” which are concerned primarily with protection relays are incorporated where required into BS142“Electrical protection relays”. All other Parts of IEC
15、Publication255 which areimplemented as BritishStandards form, or will form, Parts of this BritishStandard 1) . Classification of relay standards. Some Parts of IEC Publication255 are designated first level documents, i.e.they cover the requirements of all relays within the scope of IEC Technical Com
16、mittee No.41, Electrical relays. Other Parts of IEC Publication255 are designated lower level documents, i.e.they are concerned with the requirements of a family of relays (second level) and of smallerand more specialized groups of relays within such a family (third and fourth level). According to t
17、his system of classification, this is a first level document. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in Britis
18、hStandards. At present there is no corresponding BritishStandard for IEC96-2:1961. The technical committee has reviewed the provisions of this IEC Publication and has decided that they are acceptable for use in conjunction with this standard. The relevant related BritishStandard for the Internationa
19、l Vocabulary Chapter446 is BS4727 “Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms, Part1:Group0.3 Relay terminology”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible
20、for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, an inside back cover and a back cover. This standard has been updated
21、 (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Parts of IEC255 that form part of the IECQ Quality Assurance System will also carry a QCseries number. The method of numbering BritishStandards identical to IEC
22、Q Standards is under consideration. Cross-references International Standard Corresponding BritishStandard IEC255-0-20:1974 (first level document) BS5992 Electrical relays Part1:1980 Specification for contact performance of electrical relays (Identical) IEC255-15:1981 (first level document) BS5992 El
23、ectrical relays Part5:1983 Specification for test equipment used in endurance tests for electrical relay contacts (Identical)BS5992-4:1983 BSI 12-1999 1 Section 1. General and definitions 1 General 1.1 Scope and object This standard applies to contact assemblies of all types of relays covered by the
24、 Publication255 series:Electrical Relays. This standard specifies preferred characteristics of the contact loads to be used in endurance tests of electrical relay contacts over the ranges of voltages and currents defined by application categories. Preferred values are given for various types of load
25、 including relay and cables. As a result of further consideration the title and values of various tables differ slightly from those published in IEC Publication225-0-20:Contact Performance of Electrical Relays. The detail specifications 2)shall refer to these preferred values of contact loads but fo
26、r a particular application, additional characteristics may be defined (e.g.inrush current in a contact load circuit, lamp load or motor load). 1.2 General requirements 1.2.1 General interconnection requirements The endurance test equipment is defined by IEC Publication255-15:Specification for the Ch
27、aracteristics of Test Equipment. The contact load, as defined in the detail specification, shall be connected to the contact under test by wiring which shall be as short as possible. The wiring and the measuring equipment shall have a negligible influence on the current through, and the voltage acro
28、ss the contact during switching. To achieve this, the test point may be switchable. Protective devices or spark-quenching circuits, which are specified in the detail specification, shall be in position during tests. Earthing requirements shall be given in the detail specification. 1.2.2 Sources for
29、output quantities If the contact load comprises a voltage source, this source shall be connected with one terminal to earth. The tolerance on the voltage value shall be 10% on30mV and 2% for the other values. The internal resistance R sof the source shall be less than2% of the d.c.load resistance, a
30、nd the source impedance Z sshall be less than2% of the a.c.load impedance at all frequencies up to1MHz. When several loads are connected in parallel via the respective contacts under test to the same voltage source, the combined load needs shall be taken into account in assessing the ability of the
31、source to meet the source requirements. In the case of d.c., a sufficiently low value of Z sand an adequate limitation of the fluctuations of the output voltage may be achieved by connecting a large capacitor across the voltage source close to the contact under test. 2 Terms and definitions In addit
32、ion to the general terms defined in IEC Publication50: International Electrotechnical Vocabulary (I.E.V.), Chapter446: Electrical Relays, or in other parts of IEC Publication255, the following definition applies: 2.1 application category of contacts a category defined by the ranges of voltage and cu
33、rrent within which, under specified conditions, the contacts are able to perform their intended functions according to the specified requirements 2) In accordance with the definition in Sub-clause4.5 of IEC Guide102: Specification Structures for the Quality Assessment of Electronic Components, a det
34、ail specification is a document giving particular requirements or specifications relating to a specific type (or pattern) of relay and could be, for example, one of the parts of IEC Publication255 or a specification written by the manufacturer or user as part of a contractual agreement.BS5992-4:1983
35、 2 BSI 12-1999 3 Standard values 3.1 Application categories of contacts Application categories are given as a guidance for the selection of the appropriate loads. The ranges ofcurrent and voltage ratings appropriate to application categories0 to3 are as specified inTable I. Table I Application categ
36、ories (steady-state values, r.m.s., when a.c.) a A contact may be designed for one or more application categories or for only a part of the range of one application category and allocation can be based on the voltage and or current range. Section 2. Standard values for categories0 and1 4 Contact loa
37、ds The types of loads, for which preferred loads are specified, are given below. D.C. and a.c. (50Hz or 60Hz) resistive loads. D.C. inductive loads. Capacitive load. D.C. relay load. D.C. open-ended cable loads (floating cable). D.C. cable loads combined with resistive load. D.C. cable load combined
38、 with relay load. 4.1 D.C. and a.c. (50Hz or60Hz) resistive loads The load circuit shall be in accordance with Figure 1. The inductance of the load circuit including the voltage source, and the capacitance in parallel with R 1including the wiring, shall satisfy the limits specified in Table II. Appl
39、ication category Voltage (V) Current (A) 0 1 2 3 Uk 0.03 0.03Uk 60 5Uk 250 5Uk 600 Ik 0.01 0.01Ik 0.1 0.1Ik 1 0.1Ik 100 a This table is an updated version of the table in Appendix B of IECPublication255-0-20 and is in accordance with Clause9 of IECPublication255-7: Electrical Relays, Part7: Test and
40、 Measurement Procedures for Electromechanical All-or-nothing Relays. Figure 1 Resistive load circuit R 1 : seeTable III. R 2 U 50k7BS5992-4:1983 BSI 12-1999 3 Table II Reactance limits for the circuit of Figure 2, page 3 NOTEMore stringent test conditions may be specified in a detail specification.
41、Preferred resistance loads The preferred values of the resistive load R 1are specified in Table III, which also shows the appropriate application category in accordance with Table I. The tolerance on R 1shall be 5%. Table III Preferred resistive loads 4.2 D.C. inductive loads The test circuits and t
42、heir characteristics for inductive loads are specified in accordance with Sub-clause4.2 of IEC Publication255-0-20. 4.3 Capacitive load No requirements at present. 4.4 D.C. relay load This load is intended for application category1. The load circuit shall be in accordance with Figure 2. Unless other
43、wise specified, the relay shall be of the same type as that whose contact is under test. Resistance R 1and voltage U shall be in accordance with the rated energization of the relay and shall be stated in the detail specification. Application category L (H); R 1(7); C (pF) 0 1 k 10 7or Lk 10 4 and C
44、50 Output voltage Resistance value D.C. A.C. (r.m.s.) 277 12007 15007 47007 60007 5007 a 30mV 12V 24V 48V 60V 30mV 12V 0 1 1 1 1 1 1 a Two or three resistors (e.g.power metal film) in parallel are permissible. Figure 2 D.C. relay load. R 1 : seeSub-clause4.1. R 2 U 50k7 L R 1 -BS5992-4:1983 4 BSI 12
45、-1999 4.5 D.C. open-ended cable loads (floating cable) D.C. cable loads are intended for application category1. The load circuit shall be in accordance with Figure 3. The preferred loads are given in Table IV. The loading contact is closed to charge the cable when the contact under test is open. The
46、 test point maybe either permanently connected or switched in after the cable has been discharged by the contact under test. The cable used shall satisfy the following requirements: propagation time=5ns/m (approximately) damping=0.02dB/m (approximately) and Z 0 C=5 10 9 7 F/m 30% where Z 0 =characte
47、ristic impedance in ohms C=capacitance in farads per metre tolerance on Z 0 = 10% Cables with Z 0 =507 or757 shall generally conform to the requirements of IEC Publication96-2: Radio-frequency Cables, Part2: Relevant Cable Specifications, sheets50-3-1 or75-4-4. Table IV Preferred open-ended cable lo
48、ads 4.6 D.C. cable loads combined with resistive load This load type is intended for application category1. The load circuit shall be in accordance with Figure 4. The preferred loads are given in Table V. The requirements for resistor R 1shall be as specified in Sub-clause4.1. The requirements for t
49、he cable shall be as specified in Sub-clause4.5. Figure 3 D.C. open-ended cable load. R 1 U 10k7. R 2 U 50k7 Voltage Cable characteristics 48V 1,3,10,30 and100m each at characteristic impedance of50,75 and1407BS5992-4:1983 BSI 12-1999 5 Table V Preferred combined cable and resistive loads 4.7 D.C. cable load combined with relay load This load is intended for application category1. The load circuit shall be in accordance with Figure 5. The requirements for the relay, the voltage U and the r
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