1、A BRITISH STANDARD 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 EN 60256-21-2 : 1995 has the status of a British Standard NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY
2、 COPYRIGHT LAW 3s EN 1996 1988 nColpM.ati?lg 50255-21-2 : EC 255-21-2 : 1mtNo. 1 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services BSI BS*EN*b0255- 21-2 96 W 1624669 0561877 988 CENELEC members are bound to comply with the CENKENELEC Internal
3、Regulations which stipulate the conditions for giving 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
4、. This European Standard exists in three official versions (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 m
5、embers are the national electrotechnical committees of 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
6、 Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels I 1992 Copyright reserved to CENELEC members Ref. No. EN 60255-21-2 : 1995 E COPYRIGHT European Committee for Electrotechnical StandardizationLicensed
7、by Information Handling ServicesBSI BS*EN*b0255- 21-2 96 W 1624669 0561880 472 AEN 60256-21-2 : 1995 Issue 1, September 1996 Foreword The text of the International Standard Measuring relays and protection equipment, of IEC TC 41, Electrical relays, was submitted to the Unique Acceptance Procedure an
8、d was approved by CENELEC as EN 60255-21-2 on 1995-09-20 without any modification. The following dates were fixed: 1 IEC 255-21-2 : 1988, prepared by SC 41B), - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by - latest date by
9、 which the national standards conflicting with the EN have to be withdrawn endorsement (dp) 1996-10-01 (dow) 1996-10-01 Annexes designated normative are part of the body of the standard, appendix A and annex ZA are normative. Annex ZA has been added by CEWELEC. COPYRIGHT European Committee for Elect
10、rotechnical StandardizationLicensed by Information Handling ServicesA Issue 2. September 1996 .EN 60255-21-2 : 1995 CONTENTS Page National foreword Inside front cover Committees responsible Back cover Clause 1 Scope . 2 2 Object 2 3 Definitions . 2 3.1 Shock test 3 3.2 Shock response test 3 3.3 Shoc
11、k 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 test severity classes . 5 4.3 Bump test severity classes . 6 4.4 Recommendations for the selection of shock and bump test severity classes . 7 4.5 Test procedure for shock r
12、esponse test . 7 4.6 Test procedure for shock withstand test and bump test . 9 5 Criteria for acceptance . 9 5.1 Acceptance criteria for shock response test 9 5.2 Acceptance criteria for shock withstand test and for bump test . 10 Figures . 11 Appendix A Selection criteria for shock and bump test pa
13、rameters a) and output circuit response during shock response test b) 13 Annex ZA (normative) Normative references to international publications with their corresponding European publications . 14 1 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Ser
14、vices255-21-2 0 IEC ELECTRICAL RELAYS Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment SECTION TWO - SHOCK AND BUMP TESTS 1. Scope This standard is part of a series specifying the vibration, shock, bump and seismic requirements applicable to electromecha
15、nical and static measuring relays and protection equipment with or without output contacts. This standard includes two types of test: - - the bump test (on non-energized specimen), the shock test (on energized and non-energized specimen); and is generally based on IEC 68-2-27 and 68-2-29. The requir
16、ements 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; - standard test severity classes; - test
17、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) IEC 501 ; - IEC 68-2-27 and 68-2-29; - relay standards published in the IEC 255 series; - IS0 2041; - Sec
18、tion One: Vibration tests (sinusoidal) IEC 255-21-11. For the purpose of this standard the following definitions shall apply: 2 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesBSI BS*EN*hO255- 21-2 96 I1624669 0562883 I182 255-21-2 0 IEC 3.1
19、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 different axes of the specimen in turn, to determine its capability to withstand the effects of shocks. Note.- The term “specimen“ include
20、s any auxiliary part which is an integral functional feature of the measuring relay or protec- tion equipment under test. 3.2 Shock response test A shock test carried out on a measuring relay or protection equip- ment, energized under specified conditions, to determine its response to shocks likely
21、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 determine its capability to withstand shocks likely to be occasionally encountered during transportation and handling. 3.4 Bump test A
22、 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 determine its capability to withstand thP effects of bumps iikely to be encountered during trans- portation. 4. Requirements for s
23、hock and bump tests The main parameters of the shock and bump tests are the following: - acceleration; - - number of pulses applied. duration of the nominal pulse; In this standard the pulse shape used is one half-cycle of a sine wave. 4.1 Test apparatus and mounting The required characteristics of
24、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 specimen is mounted on the generator. 4.1 . 1 Acceleration tolerances The nominal pulse shape for shock and bump tests shall
25、 be one half-cycle of a sine wave, as indicated by the dotted line shown in Figure 1. 3 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services i BSI BS*EN*b0255- 21-2 96 = II624669 056IIBB4 OLB value of the actual acceleration shall be within the t
26、oler- ndicated by the solid lines shown in Figure 1. 255-21-2 0 IEC The true ance limits 4.1 .2 Pulse dL :ation tolerances The actual pulse duration shall be the nominal value within a toler- ance of +2 ms. 4.1 .3 Transverse motion The positive or negative peak acceleration at the monitoring point,
27、perpendicular to the intended shock 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 measur- ing system in accordance with Sub-clause 4.1.5. 4.1 .4 Repetition rate During shock and bump te
28、sts, the repetition rate shall be such that 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. Note.- For the bump test a rate of one to three pulses per second
29、is usually adequate. 4.1 .5 Measuring system The shock and bump pulse shall be measured by an accelerometer placed at the reference point, which shall be declared by the manu- facturer. The characteristics of the measuring system shall be such that it can be determined that the true value of the act
30、ual pulse, as measured in the intended direction at the reference point, is within the tolerances required by the Sub-clauses 4.1.1 and 4.1.2. The frequency response of the overall measuring system, including the accelerometer, can have a significant effect on the accuracy and shall be within the li
31、mits shown in Figure 2 for shock and bump tests. 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 sho
32、ck response test, cable connections to the specimen shall be so arranged that they impose no more restraint or mass than they would when the specimen is installed in its operating position. Note.- Care should be taken to ensure that the specimen under test is not significantly affected by any magnet
33、ic field generated by the test system. 4 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services BSI BS*EN*b0255- 21-2 96 9 II624669 0561885 T54 9 255-21-2 O IEC Class O 1 2 4.2 Shock test severity classes Peak Duration D Number of pulses accelerati
34、on A of the pulse in each direction gn) ms) - - - 5 11 3 Yk XO 11 3Yk 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 wit
35、hstand test include three different severity classes (O, 1, 2) the main parameters of which are referred to in Sub-ciauses 4.2.1 and 4.2.2 below. For particular types of measuring relays or protection equipment, the manufacturer may declare different severity classes for shock response test and shoc
36、k withstand test. When Class O is declared, no shock tests apply. 4.2.1 Shock repponse test This test is applied to an energized measuring relay or protection eq u ipmen t. The parameters for the test are given in Table I for the different severity classes. TABLE I Shock response test parameters for
37、 different severity classes (see Appendix A, Item a) * Three pulses in each direction correspond to six pulses in each axis. 4.2.2 Shock withstand test This test is applied to a non-energized measuring relay or protection equipment. 5 COPYRIGHT European Committee for Electrotechnical Standardization
38、Licensed by Information Handling Services BSI BSsENUb0255- 2L-2 96 m Lb24bb9 05b3b 990 m 255-21-2 0 IEC Class The parameters for the test are given in Table II for the different severity classes. Peak acceleration A (gn) TABLE II Shock withstand test parameters for different severity classes Peak Du
39、ration D Class acceleration A of the pulse (gn) (ms) - - O 1 10 16 2 20 16 Number of pulses in each direction - 1 ooo* 1 ooo* I I Duration D of the pulse ms) 11 1. 1 ,k Three pulses in each direction correspond axis. 4.3 Bump test severity classes Number of pulses in each direction 3* to six pulses
40、in each This test is applied to a non-energized measuring relay or protection equipment . This standard includes, for the bump test, three different severity classes (O, 1, 2) the main parameters of which are referred to in Table I I I below. When Class O is declared, no bump test applies. TABLE III
41、 6 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services- i ES1 BS*EN*b0255- 21-2 96 Lb24669 0561887 827 255-21-2 0 IEC 4.4 Recommendations for the selection of shock and bump test severity classes The test severities are classified with respect t
42、o the ability of a measuring relay or protection equipment to withstand the mechanical shocks and bumps likely to be experienced in a particular transpor- tation or type of use, in accordance with Table IV below. TABLE IV Cuide for selection of test severity classes Class Typical applications I ther
43、e are no shock and bump requirements Measuring relays and protection equipment for which 1 2 Measuring relays and protection equipment for normal use in power plants, substations and industrial plants and for normal transportation conditions” Measuring relays and protection equipment for which a ver
44、y high security margin is required or where the shock and bump levels are very high, e.g. shipboard application and for severe transportation conditions* k The packaging of the measuring relay or protection equipment should be designed and implemented in such a manner that the severity class paramet
45、ers will not be exceeded during transportation. 4.5 Test procedure for shock response test The shock pulse characteristics shall be measured at the reference point, which shall be declared by the manufacturer. Note.- If the size of a specimen makes it impracticable to test it as a whole, it may be t
46、ested as functional sub-units as agreed between manufacturer and user. During the test, the specimen shall be in its case with the cover, if any, in position. Any transportation restraints shall be removed. 7 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Ha
47、ndling Services- ._ BSI BS*EN*b0255- 2L-2 96 Lb24bb9 05bL 7b3 255-21-2 0 IEC 4.5.1 During the test, three successive pulses shall be applied in each direction of the three mutually perpendicular axes of the specimen in turn (a total of 18 pulses). The peak acceleration shall be as specified in Table
48、 I for the declared severity class. 4.5.2 The test shall be carried out on a measuring relay or protection equipment under reference conditions stated in the relevant relay standard, published in the IEC 255 series, and with the following values of energizing quantities (auxiliary and input) and loa
49、ding applied to the appropriate circuits: - auxiliary energizing quantity(ies) : rated value(s); - output circuit loadings: no loading except the monitoring devices or loading as declared by the manufacturer; - input energizing quantity(ies) : values equal to the operating value of the characteristic quantity plus and minus the manufacturers declared variation for no maloperation due to shocks, see Items a) and b) below. a) The value of the characteristic quantity shall be below the operating value for maximum measuring relay or protection
