1、BRITISH STANDARD BS EN 60255-21-2: 1996 IEC255-21-2: 1988 Incorporating Amendment No. 1 Electrical relays Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment Section 2: Shock and bump tests The European Standard EN60255-21-2:1995 has the status of a British
2、 StandardBSEN60255-21-2:1995 This British Standard, having been prepared under the directionof the General Electrotechnical Engineering Standards Policy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31December1989 BSI03-1999 The following BSI references relat
3、e to the work on this standard: Committee reference GEL/5 Draft for comment 86/27035 DC ISBN 0 580 17984 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Electrotechnical Standards Policy Committee (GEL/-) to Technical Committee
4、 GEL/5, upon which the following bodies were represented: British Telecommunications plc Electricity Supply Industry in England and Wales Electronic Components Industry Federation Transmission and Distribution Association (BEAMA Limited) The following body was also represented in the drafting of the
5、 standard, through subcommittees and panels: Association of Consulting Engineers Amendments issued since publication Amd. No. Date of issue Comments 9099 September 1996 Indicated by a sideline in the marginBSEN60255-21-2:1995 BSI 03-1999 i Contents Page Committees responsible Inside front cover Nati
6、onal foreword ii Foreword 2 Text of EN 60255-21-2 3 Publications referred to Inside back coverBSEN60255-21-2:1995 ii BSI 03-1999 National foreword This Subsection of BS142 has been prepared under the direction of the General Electrotechnical Engineering Standards Policy Committee. It is identical wi
7、th IEC Publication255-21-2:1988 “Electrical relays. Part21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment. Section Two-Shock and bump tests”, published by the International Electrotechnical Commission (IEC). NOTEThis Subsection should be read in conjunction wi
8、th BS142-0 “General introduction and list of Parts”. In1995 the European Committee for Electrotechnical Standardization (CENELEC) accepted IEC255-21-2:1988 as European Standard EN60255-21-2:1995. As a consequence of implementing the European Standard this British Standard is numbered as BS EN60255-2
9、1-2:1996 and any reference to BS 142-1.5.2:1989 should be read as reference to BS EN60255-21-2:1996. Cross-references The international text refers to the International Electrotechnical Vocabulary. The corresponding British Standard is BS4727 Glossary of electrotechnical power, telecommunication, el
10、ectronics, lighting and colour terms, of which Part1:Group03 Relay terminology is particularly relevant. However, terms specific to the needs of protection relays are to be found in BS142-1.1. General references to IEC255 in this context should be taken as equivalent to references to BS142. The Brit
11、ish Standard related to ISO2041-1975 is BS3015 Glossary of terms relating to mechanical vibration and shock. NOTETypographical errors. In Table I, Table II and Table III, gn should be g n . A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
12、andards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International standard Corresponding British Standard BS 2011 Basic environmental testing procedures Part 2.1 Tests IEC68-2-27:(1987) Part 2.1 Ea:1988
13、Test Ea. Shock (Identical) IEC68-2-29:(1987) Part 2.1 Eb:1987 Test Eb. Bump (Identical) BS QC160000 Harmonized system of quality assessment for electronic components. Electrical relays. Generic specification: electromechanical all-or-nothing relays IEC255-7:1978 Part 1:1987 Test and measurement proc
14、edures (Identical) BS142 Electrical protection relays Part 1 Information and requirements for all protection relays Section 1.5 Vibration, shock, bump and seismic testing IEC255-21-1:1988 Subsection 1.5.1:1989 Specification for vibration tests (sinusoidal) Summary of pages This document comprises a
15、front cover, an inside front cover, pages i and ii, theEN title page, pages2to10, 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 theinside front cover.EUROPEAN STAND
16、ARD NORME EUROPENNE EUROPISCHE NORM EN60255-21-2 November 1995 ICS29.120.70 Descriptors: Measuring relays, shock and bump tests English version Electrical relays Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment Section 2: Shock and bump tests (IEC255-21-
17、2:1988) Relais lectriques Partie 21: Essais de vibrations, de chocs, de secousses et de tenue aux sismes applicables aux relais de mesure et aux dispositifs de protection Section 2: Essais de chocs et de secousses (CEI255-21-2:1988) Elektrische Relais Teil 21: Schwing-, Schock-, Dauerschock- und Erd
18、bebenprfungen an Merelais und Schutzeinrichtungen Hauptabschnitt 2: Schock- und Dauerschockprfungen (IEC255-21-2:1988) This European Standard was approved by CENELEC on 1995-09-20; CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving
19、 this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official ver
20、sions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees o
21、f Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europische
22、s Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart35, B-1050 Brussels 1992 Copyright reserved to CENELEC members Ref. No. EN60255-21-2:1995 EEN60255-21-2:1995 BSI 03-1999 2 Foreword The text of the International Standard IEC255-21-2:1988, prepared by SC41B*), Measuring relay
23、s and protection equipment, of IECTC41, Electrical relays, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN60255-21-2 on1995-09-20 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard, Appendix
24、 A and Annex ZA are normative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 1 Scope 3 2 Object 3 3 Definitions 3 3.1 Shock test 3 3.2 Shock response test 3 3.3 Shock withstand test 3 3.4 Bump test 3 4 Requirements for shock and bump tests 3 4.1 Test apparatus and mounting 3 4.2 Shock
25、 test severity classes 4 4.3 Bump test severity classes 4 4.4 Recommendations for the selection of shock and bump test severity classes 5 4.5 Test procedure for shock response test 5 4.6 Test procedure for shock withstand test and bump test 6 5 Criteria for acceptance 6 5.1 Acceptance criteria for s
26、hock response test 6 5.2 Acceptance criteria for shock withstand test and for bump test 6 Appendix A Selection criteria for shock and bump test parameters a) and output circuit response during shock response test b) 9 Annex ZA (normative) Normative references to international publications with their
27、 corresponding European publications 10 Figure 1 Pulse shape (half-sine) and tolerances for the shock and bump tests 7 Figure 2 Frequency characteristics of the measuring system for the shock and bump tests 8 Table I Shock response test parameters for different severity classes see Appendix A, Item
28、a) 4 Table II Shock withstand test parameters for different severity classes 4 Table III Bump test parameters for different severity classes see Appendix A, Item a) 5 Table IV Guide for selection of test severity classes 5 latest date by which the ENhas to be implemented at national level by publica
29、tion of an identical national standard or by endorsement (dop) 1996-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1996-10-01EN60255-21-2:1995 BSI 03-1999 3 1 Scope This standard is part of a series specifying the vibration, shock, bump and seism
30、ic requirements applicable to electromechanical and static measuring relays and protection equipment with or without output contacts. This standard includes two types of test: the shock test (on energized and non-energized specimen); the bump test (on non-energized specimen), and is generally based
31、on IEC68-2-27and IEC68-2-29. The requirements of this standard are applicable only to measuring relays and protection equipment in new condition. The tests specified in this standard are type tests. 2 Object The object of this standard is to state: definitions of terms used; test conditions; standar
32、d test severity classes; test procedure; criteria for acceptance. 3 Definitions For definitions of general terms not defined in this standard, reference should be made to: International Electrotechnical Vocabulary (IEV) IEC50; IEC68-2-27 andIEC68-2-29; relay standards published in the IEC255 series;
33、 ISO2041; Section 1: Vibration tests (sinusoidal) IEC255-21-1. For the purpose of this standard the following definitions shall apply: 3.1 shock test a test during which a specimen, non-energized or energized under specified conditions, is subjected to a limited number of single shocks, in the three
34、 different axes of the specimen in turn, to determine its capability to withstand the effects of shocks NOTEThe term “specimen” includes any auxiliary part which is an integral functional feature of the measuring relay or protection equipment under test. 3.2 shock response test a shock test carried
35、out on a measuring relay or protection equipment, energized under specified conditions, to determine its response to shocks likely to be occasionally encountered in service 3.3 shock withstand test a high level shock test carried out on a non-energized measuring relay or protection equipment to dete
36、rmine its capability to withstand shocks likely to be occasionally encountered during transportation and handling 3.4 bump test a test during which a non-energized measuring relay or protection equipment is subjected to a limited number of bumps, in three different axes of the specimen in turn, to d
37、etermine its capability to withstand the effects of bumps likely to be encountered during transportation 4 Requirements for shock and bump tests The main parameters of the shock and bump tests are the following: acceleration; duration of the nominal pulse; number of pulses applied. In this standard
38、the pulse shape used is one half-cycle of a sine wave. 4.1 Test apparatus and mounting The required characteristics of the shock and bump generators and fixtures together with the mounting requirements shall be as specified in the following sub-clauses. The characteristics shall apply when the speci
39、men is mounted on the generator. 4.1.1 Acceleration tolerances The nominal pulse shape for shock and bump tests shall be one half-cycle of a sine wave, as indicated by the dotted line shown in Figure 1. The true value of the actual acceleration shall be within the tolerance limits indicated by the s
40、olid lines shown in Figure 1. 4.1.2 Pulse duration tolerances The actual pulse duration shall be the nominal value within a tolerance of2ms.EN60255-21-2:1995 4 BSI 03-1999 4.1.3 Transverse motion The positive or negative peak acceleration at the monitoring point, perpendicular to the intended shock
41、or bump direction, shall not exceed, at any time,30% of the value of the peak acceleration of the nominal pulse in the intended direction, when determined by a measuring system in accordance with Sub-clause4.1.5. 4.1.4 Repetition rate During shock and bump tests, the repetition rate shall be such th
42、at between applied pulses the relative motion within the specimen shall be substantially zero and the value of acceleration at the reference point shall be within the limits shown in Figure 1. NOTEFor the bump test a rate of one to three pulses per second is usually adequate. 4.1.5 Measuring system
43、The shock and bump pulse shall be measured by an accelerometer placed at the reference point, which shall be declared by the manufacturer. The characteristics of the measuring system shall be such that it can be determined that the true value of the actual pulse, as measured in the intended directio
44、n at the reference point, is within the tolerances required by the Sub-clauses4.1.1 and4.1.2. The frequency response of the overall measuring system, including the accelerometer, can have a significant effect on the accuracy and shall be within the limits shown in Figure 2 for shock and bump tests.
45、4.1.6 Mounting The specimen shall be fastened to the shock or bump generator or fixture by its normal means of attachment in service, such that the gravitational force acts on it in the same relative direction as it would in normal use. During the shock response test, cable connections to the specim
46、en shall be so arranged that they impose no more restraint or mass than they would when the specimen is installed in its operating position. NOTECare should be taken to ensure that the specimen under test is not significantly affected by any magnetic field generated by the test system. 4.2 Shock tes
47、t severity classes This standard includes two types of shock tests: shock response test on an energized relay or protection equipment; shock withstand test on a non-energized relay or protection equipment. Both shock response test and shock withstand test include three different severity classes (0,
48、 1, 2) the main parameters of which are referred to in Sub-clauses4.2.1 and4.2.2 below. For particular types of measuring relays or protection equipment, the manufacturer may declare different severity classes for shock response test and shock withstand test. When Class0 is declared, no shock tests
49、apply. 4.2.1 Shock response test This test is applied, to an energized measuring relay or protection equipment. The parameters for the test are given in Table I for the different severity classes. Table I Shock response test parameters fordifferent severity classes see Appendix A,Item a) 4.2.2 Shock withstand test This test is applied to a non-energized measuring relay or protection equipment. The parameters for the test are given in Table II for the different severity classes. Table II Shock withstand
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