1、CENELEC EN*b0255-2L- 3 95 3404583 OLbL925 439 81 BRITISH STANDARD A Electrical relays Part 21. Vibration, shock, bump and seismic tests on measuring relays and protection equipment Section 3. Seismic tests Ttie European Standard EN 6025.5421-3 : 1995 has the status of a British Standard BS EN 60255-
2、21-3 : 1995 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*b0255-21- 3 95 E3 3404583 0161926 375 Standards Board and comes into effect on 15 December i993 Amd. N. BS 142 : Subsection 1.5.3 : 1993 1 t i Committees responsible for t
3、his British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/-) to %hnical Committee PEL95, upon which the following bodies were represented: Association of Consulting Engineers Electricity Association Electronic Comp
4、onents Industry Federation Transmission and Distribution Association (BEAMA Ltd.) %i BSI i993 The following BSI references relate to the work on this standard: Committee reference PELIS5 Draft announced in BSI News November i993 ISBN O 580 22664 6 COPYRIGHT European Committee for Electrotechnical St
5、andardizationLicensed by Information Handling Services CENELEC EN*b0255-21- 3 95 3404583 OLbL927 2OL Bs 142 : Subsection 1.6.3 1993 Page inside front cover Committees responsible National foreword ii Methods 1 Scope and object 1 2 Normative references 1 3 Definitions 2 4 3 5 Requirements for single
6、axis sine sweep seismic test (method A) (method B) 5 6 Selection of test severity classes 8 7 %stprocedures 8 8 Criteria for acceptance 9 A (informative) Seismic tests choice criteria 12 Requirements for biaxial multi-frequency mdom seismic test Annex Igbles 1 2 Single axis sine sweep seismic test p
7、arameters for different severity classes 5 Biaxial multi-frequency random seismic test parameters for different severity classes 7 3 Guide for the selection of test severity class 8 1 Multi-frequency broad-band standard response spectrum shape 10 2 Typical time-history 10 Acceleration versus frequen
8、cy for the single axis sine sweep seismic test 11 Figures 3 1 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC ENxb0255-21- 3 75 3404583 OLbL28 L48 BS 142 : Subsection 1.5.3 : 1F3 National foreword This Subsection of BS 142 has been pr
9、epared under the direction of the Power Electrical Engineering Standards Policy Committee. It is identical with IEC 255-21-3 : 1993 Electrical relays - part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section 3: Se.iSmic tests, published by the Interna
10、tional Electrotechnical Commission (IEC). NOTE. This Subsection should be read in conjunction with Bs 142 : Part O Generul introduction and list qfmrts. Iii :1%4 the European Conunittee for Electrotedmical Staidariisatiori (CIENELEC accepted LEC 255213 : 1993 as European Standard EN W255-2 13 : 1993
11、. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN 60255-21-3 : 1995 and any reference to S 1.12 : Subsection 1.5.3 . should be read as a reference to BS EN 602552 1-3. Cross-references international standard C 68-2-6 : 1982 IkC .255-21-1 : 1988 IEC
12、 255-21-2 : 1988 IEC 68-2-57 : 1989 IEC 68-3-3 : 1991 IS0 2041 : 1990 Corresponding British Standard BS 20 11 Enviwnmental testing Part 2.1 : 1983 lhts, Mt Fc. Viibmtion (sinusoidal) (Identical) BS 142 Electrical protection relays Section 1.5 Vihtion, shock, bump and seismic testing Subsection 1.5.1
13、 : 1989 Speci,ficatZon for vibratwn tests (sinusoidal) Identical) Subsection 1.5.2 : 1989 Specijicatwn fmshock and bump tests (Identical) BS EN 60068 Environmental testing BS EN 60068-2-57 : 1993 m2ml!3 lht m. Vihtion - T.im-h.Lskny method (Identical) BS EN 60068-3-3 : 1993 Part 3 Guidance Section 4
14、.3 Seismic test methods for equipmen. and - the biaxial multi-frequency random seismic test (method B). During preparation of this standard, it was determined that the number of countries in which the first test method was preferred was about equal to the number of countries in which the second meth
15、od was preferred. For this reason both methods have been retained, and neither have been identified as reference (or “referee“) method. The requirements of this standard are applicable only to measuring relays and protection equipment in a new condition. The tests specified in this standard are type
16、 tests. The object of this standard is to state: - definitions of terms used; - test conditions; - standard test severity classes; - test procedures; - criteria for acceptance. 2 Normative references The following normative documents contain provisions which. through reference in this text, constitu
17、te provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editi
18、ons of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. 1 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*b0255-21- 3 95 IBI 3404583 OLb1932 b79 E BS 142
19、 : Subsection 1.5.3 : 19Q3 IEC 50: International Electrotechnical Vocabulary (IEV) IEC 68-2-6: 1982, Environmental testing - Part 2: Tests - Test Fc and guidance: Vibration (sinusoidal) IEC 68-2-57: 1989, Environmental testing - Part 2: Tests - Test Fi: Vibration - Time- history method IEC 68-3-3: 1
20、991, Environmental testing - Part 3: Guidance - Seismic test methods for equipments IEC 255-21 -1 : 1988, Electrical relays - Part 21: Vibration. shock, bump and seismic tests on measuring relays and protection equipment - Section 1: Vibration tests (sinusoidal) IEC 255-21-2: 1988: Electrical relays
21、 - Part 27: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section 2: Shock and bump tests IS0 2041 : 1990, Vibration and shock - Vocabulary 3 Definitions For definitions of general terms not defined in this standard, reference should be made to: - IEC Intern
22、ational Electrotechnical Vocabulary (IEV) (IEC 50) - IEC 68-2-6, IEC 68-2-57, and IEC 68-3-3; - IEC relay standards published in the IEC 255 series and in particular IEC 255-21-1 and IEC 255-21-2; - ISO2041. 3.1 A test during which a specimen is submitted to sweeps of sinusoidal vibration in the thr
23、ee orthogonal axes of the specimen in turn, in terms of constant displacement and/or constant acceleration, within a standard frequency range. Single axis sine sweep seismic test NOTE - The term specimen includes any auxiliary part which is an integral functional feature of the measur- ing relay pro
24、tection equipment under test. 3.2 Biaxial fest A test during which a specimen is submitted to stresses in the horizontal and vertical axes simultaneously. 2 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services- _. CENELEC EN*h0255-2L- 3 75 340458
25、3 0161933 505 BS 142 : Subsection 1.5.3 : 1993 3.3 Biaxial multi-frequency random seismic tesf A test during which a specimen is submitted to a random sequence of stresses with a test response spectrum which reproduces the standard response spectrum by a biaxial multi- frequency input motion. 3.4 St
26、andard response spectrum A response spectrum whose shape shall be according to figure 1, and whose main parameters are the damping and the zero period acceleration defined below. 3.5 Damping A generic term ascribed to the numerous energy dissipation mechanisms in a system. In practice, damping depen
27、ds on many parameters such as construction, mode of vibra- tion, strain, applied forces, velocity, materials, joint slippage, etc. 3.6 Zero period acceleration High frequency asymptotic value of acceleration of the response spectrum (see figure 1). NOTE - The zero period acceleration is of practical
28、 significance as it represents the largest peak value of acceleration in a time-history. This is not to be confused with the peak value of acceleration in the response spectrum. 3.7 Random motion sample Sample of random motion record modified in frequency range and amplitude so as to produce the req
29、uired or the standard response spectrum. 3.8 Time-history Recording, as a function of time, of acceleration or displacement or velocity, resulting from a given event (see figure 2). 3.9 Strong part of the time-history The strong part of the time-history is the part of the time-history from the time
30、when the plot first reaches 25 lo of the maximum value to the time when it reaches for the last time the 25 level(see figure 2). 4 Requirements for single axis sine sweep seismlc test (method A) 4.1 Main parameters The main parameters of the single axis sine sweep seismic test are the following: - f
31、requency range; - acceleration; - displacement amplitude below the crosc-over frequency; - sweep rate and number of sweep cycles. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services-_._e- - CENELEC EN*b0255-21- 3 95 3404583 03b3934 Y41 81 BS 142
32、 : Subsection 1.5.3 : 1993 4.2 Test apparatus and mounting The required characteristics of the vibration generator and fixture, together with the mount- ing requirements, shall be as follows. The characteristics apply when the specimen is mounted on the generator. 4.2.1 Basic motion The basic motion
33、 shall be a sinusoidal function of time, and such that the fixing point of the specimen moves substantially in phase and in straight parallel lines along a specified axis, subject to the requirements of 4.2.2 and 4.2.3. 4.2.2 Transverse motion The maximum vibration amplitude at the check points in a
34、ny axis perpendicular to the specified axis shall not exceed 50 Yo of the specified amplitude. 4.2.3 Distortion The acceleration distortion measurement shall be carried out at the reference point, which shall be declared by the manufacturer. The distortion, as defined in 3.9 of IEC 255-21-1, shall n
35、ot exceed 25 %. In cases where a distortion value greater than 25 % is obtained, the distortion shall be noted, and agreed between manufacturer and user. 4.2.4 Vibration amplitude tolerances The actual vibration displacement and acceleration amplitude along the required axis of the reference point s
36、hall be equal to the specified value, within a tolerance of I15 %. 4.2.5 Frequency range tolerances The frequency range shall be equal to the specified values (see 4.3 and 5.2.4) within the following tolerances: 10,2 Hz, for the lower frequency 1 Hz; 11 Hz, for the upper frequency 35 Hz. 4.2.6 Sweep
37、 The sweeping shall be continuous and the frequency shall change exponentially with time. The sweep rate shall be 1 octave per min f 10 Yo. 4.2.7 Mo u nt ing The specimen shall be fastened to the vibration generator or fixture by its normal means of attachment in service so that the gravitational fo
38、rce acts on it in the same relative direction as it would in normal use. The test fixture shall be rigid structure to minimize amplification and spurious motion within the frequency range of the test. 4 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling
39、 ServicesBS 142 : Subsection 1.5.3 : 1993 F Class O 1 2 During the 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
40、 under test is not significantly affected by any magnetic field generated by the vibration system. Peak displacement below the cross-over frequency mm Peak acceleration above the cross-over frequency gn Number of sweep cycles in each axis X Y X. Y - - - - - 3.5 1.5 1 .O OS 1 7.5 3.5 2.0 1 .o 1 4.3 T
41、est severity classes The single axis sine sweep seismic test includes three different severity classes (O. 1. 2). the main parameters of which are referred to in table 1 below. When class O is declared, no single axis sine sweep seismic test applies. The nominal frequency range for this test is 1 Hz
42、 to 35 Hz and the cross-over frequency is 8 Hz to 9 Hz (see figure 3). Table 1 - Single axis sine sweep seismic test parameters for different severity classes NOTES 1 corresponds to a test time of about 10 min. 2 test wave produces a higher severity level than other seismic test methods. For the fre
43、quency range of 1 Hz to 35 Hz and a sweep rate of 1 octave per min. 1 sweep cycle When considering the values scheduled it should be taken into consideration that sine sweep seismic 5 Requirements for biaxial multi-frequency random seismic test (method B) 5.1 Main parameters The main parameters of t
44、he biaxial multi-frequency random seismic test are the following: 5 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*b255-21- 3 75 EEl 3404583 LbL93b 214 BS 142 : Subsection 1.5.3 : 1993 - frequency range; - standard response spectr
45、um; - zero period acceleration; - - damping. number and duration of time-histories; In this standard, a damping value of 5 % is assumed as the standard value of damping (see annex A). 5.2 Test apparatus and mounting The required characteristics of the test generator and fixture, together with the mo
46、unting requirements shall be as follows. The characteristics apply when the specimen is mounted on the generator. 5.2.1 Basic motion The time-history used can be obtained from a synthesized composition of multi-frequency broad-band standard response spectrum (see figure 1) within the nominal frequen
47、cy range. The synthesized time-history shall be generated with a resolution of at least 1/6 octave bands. 5.2.2 Transverse motion The maximum peak value of acceleration or displacement at the check points in any axis perpendicular to the specified axis shall not exceed 25 Yo of the specified peak va
48、lue in the time-history. The recorded measurements need only cover the nominal frequency range. 5.2.3 The tolerance zone to be applied to the standard response spectrum shall be in a range of Tolerance zone for the standard response spectrum O to +50 Yo. NOTE - If a small proportion of the individua
49、l points on the test response spectnim lies outside this zone, the test may still be acceptable and the values for these points should be reported in the test report. The test response spectrum shall be checked at least in 116 octave bands. 5.2.4 Frequency range The signal from the reference point shall not contain any frequency higher than the test range, except those induced by the test facilities and specimen. The maximum value of the signal outside the test frequency range induced by the test facilities without specimen shall not exceed 20 % of the maximum v
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