1、BRITISH STANDARD BS5992-5: 1983 IEC255-15: 1981 Electrical relays Part 5: Specification for test equipment used in endurance tests for electrical relay contacts UDC 621.318.5:620.169.1.05BS5992-5:1983 This BritishStandard, having been prepared under the directionof the General Electrotechnical Engin
2、eering Standards Committee, was published under the authorityofthe Board of BSIandcomes into effect on 29April1983 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference GEL/5 Draft for comment78/27227 DC ISBN 0 580 11944 0 Committees responsible for this B
3、ritishStandard 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 Transmission and Distribution Association Br
4、itish Telecommunications Electricity Supply Industry in England and Wales Electronic Components Industry Federation Institution of Electrical Engineers Ministry of Defence Telecommunications Engineering and Manufacturing Association (TEMA) The following bodies were also represented in the drafting o
5、f the standard, through subcommittees and panels: Association of Consulting Engineers Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA) Association of Control Manufacturers TACMA (BEAMA) Cinematograph Exhibitors Association of Great Britain and Ireland Control and
6、 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 publication Amd. No. Date of issue C
7、ommentsBS5992-5:1983 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 General 1 2 Terms and definitions 1 3 Equipment application range 2 4 Environmental conditions 2 5 Requirements for input currents 2 6 Requirements for output currents 3 7 Measuring and
8、indicating device requirements 3 8 Control device 3 9 Reliability 3 Figure 1 Functional block diagram of a complete endurance test equipment 1 Figure 2 4 Publications referred to Inside back coverBS5992-5:1983 ii BSI 12-1999 National foreword This Part of this BritishStandard, which has been prepare
9、d under the direction of the General Electrotechnical Engineering Standards Committee, is identical with IEC Publication255-15 “Electrical relays, Part15 Endurance tests for electrical relay contactsSpecification for the characteristics of test equipment”, published in1981 by the International Elect
10、rotechnical 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 Publication255 which are implemented as BritishStandards form, or
11、 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 Committee No.41, Electrical relays. OtherParts of IEC Publication25
12、5 are designated lower level documents, i.e.theyareconcerned with the requirements of a family of relays (second level) and of smaller and more specialized groups of relays within such a family (thirdand fourth level). According to this system of classification, this is a first level document. Termi
13、nology 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 British Standards. The relevant related BritishStandard for the Internati
14、onal Electrotechnical Vocabulary Chapter446 is BS4727 “Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms, Part1: Group03 Relay terminology”. 1) Parts of IEC255 that form part of the IEC Q Quality Assurance System will also carry a QC series number. The me
15、thod of numbering BritishStandards identical to IEC 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 (Identi
16、cal) IEC255-1-00:1975 (second level document) BS5992 Electrical relays Part2:1980 Specification for all-or-nothing electrical relays (Identical) IEC255-14:1981 (first level document) BS5992 Electrical relays Part4:1983 Specification for contact loads of preferred values used in endurance tests for e
17、lectrical relay contacts (Identical)BS5992-5:1983 BSI 12-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity
18、 from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to4, 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
19、 table on the inside front cover.iv blankBS5992-5:1983 BSI 12-1999 1 1 General 1.1 Scope This standard specifies the main characteristics of endurance test equipment used for electrical relay contacts used in relays specified in the IEC255 series of publications. 1.2 Functional block diagram The fun
20、ctions of a complete endurance test equipment are shown in the following block diagram: 2 Terms and definitions In addition to the general terms defined in IEC Publication50(446): International Electrotechnical Vocabulary (I.E.V.), Chapter446: Electrical Relays, and in other parts of IEC Publication
21、255, the following terms and definitions apply: 2.1 sources for input energizing quantities the power supplies including provision for stabilization within given voltage limits and given impedances including safety arrangements, e.g.fuses, etc., for the input energization of relays 2.2 switching dev
22、ice an apparatus to effect the various switching actions required during a cycle of testing, including the connections to relays to be tested, decoupling devices (e.g.diodes), and current indicators placed in the relay coil circuits; and having the ability to change the polarity of the connections t
23、o bi-stable relays 2.3 sources for output quantities the power supplies including provision for stabilization within given voltage and impedance limits including safety arrangements, e.g.fuses, etc., to energize the loads 2.4 control device the equipment generating commands to run a specified test s
24、equence controlling synchronization and the flow of orders (e.g.starts, measurements, stops) Figure 1 Functional block diagram of a complete endurance test equipmentBS5992-5:1983 2 BSI 12-1999 2.5 measuring and indicating device a facility for indicating and detecting failures and for measuring and
25、possibly recording the results of a test NOTEThis may cover: sample specification; date of test; number of operations or test time; type and number of failures, possibly stop signals to switching device; number of operations until failure; limits, mean values etc., of measurements and tests; failure
26、s of test equipment; The detail specification may prescribe that the information recorded be made indifferently by counters, tape, etc. 3 Equipment application range The test equipment shall be suitable for use with one or more of the preferred contact loads specified in Sections2 and3 of IEC Public
27、ation255-14: Part14: Endurance Tests for Electrical Relay Contacts Preferred Values for Contact Loads. 4 Environmental conditions The test equipment shall be able to operate in the following ranges of environmental conditions. Ambient temperature 15 C to35 C. Atmospheric pressure 86kN/m 2to106kN/m 2
28、 . Relative humidity 45% to 75%. NOTEIn practice the switching device (Sub-clause 2.2) and control device (Sub-clause 2.4) may be combined into a single piece of equipment, e.g.switching programmer. 5 Requirements for input circuits 5.1 Sources for input energizing quantities and switching device So
29、urces for input energizing quantities shall be capable of delivering the rated values of energizing quantities, the tolerances for which shall be as stated in the blank detail specification. The switching device shall be capable of handling the rated values of the energizing quantities without affec
30、ting the stated tolerances. 5.1.1 The rated voltages shall be chosen from the values given in Sub-clause3.1.1 of IEC Publication255-1-00: All-or-nothing Electrical Relays. The source, and when necessary, its polarity shall be able to be controlled externally. 5.1.2 The number of cycles per hour shal
31、l be chosen from the values given in Sub-clause3.5.1 of IECPublication255-1-00. 5.1.3 The input voltage envelope shall be rectangular (practically bounce-free) and the duty factor50% unless otherwise specified by the detail specification for the contact under test. 5.2 Connection of relays and test
32、coils When several coils are energized together a parallel connection is preferred. Decoupling devices (e.g.diodes) should be provided if necessary. However, where coils are intended to be operated at a relatively high current and low voltage, several coils may be energized in series together with a
33、 suitable value of resistance, if necessary.BS5992-5:1983 BSI 12-1999 3 6 Requirements for output circuits 6.1 Sources for output quantities The source voltage shall be chosen from the rated voltage values given in Clause3 of IEC Publication255-0-20: Electrical RelaysContact Performance of Electrica
34、l Relays. The requirements for source impedance and resistance, together with the tolerance of the source voltage shall be in accordance with Sub-clause1.2.2 of IEC Publication255-14. 6.2 Connections between resistive loads and contacts For resistive loads or loads containing resistive components fo
35、r application categories0 and1, the capacitance across the resistance including the wiring shall be less than50pF. 7 Measuring and indicating device requirements 7.1 Intervals of indications The failures which are to be registered by the indicating device shall be selected from Sub-clause4.4 of IECP
36、ublication255-0-20 and given in the detail specification. Where accumulated failures are to be indicated at intervals, the appropriate quantities shall be tested at the end of the following preferred number of operations: 0;1.10 ;3.10 ; n=3,4,5,6,7,8 . . . . and end of life. For some types of failur
37、e the indicating device may be capable of registering failures after each operation. The equipment may be provided with automatic interruption of the input and output circuits when a failure of a particular type occurs. 7.2 Minimum interruption time Interruptions (bounces, etc.) lasting for a shorte
38、r time than the value specified in the detail specification should not be taken into account (e.g.neither indicated nor recorded), for instance,104s for categories0 and1, or1ms for categories2 and3. 8 Control device 8.1 Waveforms The waveform showing the energization of the relay under test, its con
39、nection to the measurement circuits and the periods of failure checking should be as shown in Figure 2. For a.c. relays, the test cycle should not be in synchronism with the supply frequency unless it can be shown that this does not lead to misleading test results. 8.2 Safety alarm The safety alarm
40、devices should indicate: excessive temperature rise; voltage outside the given limits; failure of input sources; failure of information storage. 9 Reliability The control device shall be designed so that its failure will not affect the test result.BS5992-5:1983 4 BSI 12-1999 Figure 2 BS5992-5:1983 B
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