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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section 3: Seismic testsRelais électriques - Partie 21: Essais de vibrations, de chocs, de secousses et de tenue aux séismes applicables aux relais de mesure et aux dispositifs de protection - Section 3: Essais de tenue aux séismesElectrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section 3: Seismic tests29.120.70RelejiRelaysICS:Ta slovenski standard je istoveten z:IEC 60255-21-3SIST IEC 60255-21-3:1995en01-avgust-1995SIST IEC 60255-21-3:1995SLOVENSKI
STANDARD
CODE PRIXPRICE CODENNORMECEIINTERNATIONALEIECINTERNATIONAL255-21-3STANDARDPremière éditionFirst edition1993-09Relais électriques —Partie 21:Essais de vibrations, de chocs, de secousseset de tenue aux séismes applicables aux relaisde mesure et aux dispositifs de protection -Section 3: Essais de tenue aux séismesElectrical relays —Part 21:Vibration, shock, bump and seismic testson measuring relays and protection equipment —Section 3: Seismic tests© CEI 1993 Droits de reproduction réservés — Copyright — all rights reservedAucune partie de cette publication ne peut 'être reproduite niutilisée sous quelque forme que ce soit et par aucun pro-cédé, électronique ou mécanique, y compris la photocopie etles microfilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permissionin writing from the publisher.Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève, SuisseCommission Electrotechnique InternationaleFor price, see current catalogueIEC International Electrotechnical CommissionMemayHapoAHan 3neKrporexHH4ecHaFi KoMHCCHR• Pour prix, voir catalogue en vigueurSIST IEC 60255-21-3:1995
255-21-3 © IEC:1993- 3 -CONTENTSPageFOREWORDClause1Scope and object72 Normative references73Definitions93.1Single axis sine sweep seismic test93.2Biaxial test 93.3Biaxial multi-frequency random seismic test113.4 Standard response spectrum
113.5 Damping 113.6 Zero period acceleration 113.7 Random motion sample 113.8 Time-history113.9Strong part of the time-history114Requirements for single axis sine sweep seismic test (method A)114.1Main parameters 114.2 Test apparatus and mounting 134.3 Test severity classes155Requirements for biaxial multi-frequency random seismic test (method B)155.1Main parameters 155.2 Test apparatus and mounting 175.3 Test severity classes195.4Biaxial conditioning19Selection of test severity classes216.1Recommendations for selection of test classes216.2Identification of test method and severity class217 Test procedures 218Criteria for acceptance 23Figures1Multi-frequency broad-band standard response spectrum shape 252Typical time-history253Acceleration versus frequency for the single axis sine sweep seismic test27Annex A - Seismic tests choice criteria 29SIST IEC 60255-21-3:1995
255-21-3 ©IEC:1993– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSIONELECTRICAL RELAYS —Part 21: Vibration, shock, bump and seismic testson measuring relays and protection equipment —Section 3: Seismic testsFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardizationcomprising all national electrotechnical committees (IEC National Committees). The object of the IEC is topromote international cooperation on all questions concerning standardization in the electrical andelectronic fields. To this end and in addition to other activities, the IEC publishes International Standards.Their preparation is entrusted to technical committees; any IEC National Committee interested inthe subject dealt with may participate in this preparatory work. International, governmental andnon-governmental organizations liaising with the IEC also participate in this preparation. The IECcollaborates closely with the International Organization for Standardization (ISO) in accordance withconditions determined by agreement between the two organizations.2)The formal decisions or agreements of the IEC on technical matters, prepared by technical committees onwhich all the National Committees having a special interest therein are represented, express, as nearly aspossible, an international consensus of opinion on the subjects dealt with.3)They have the form of recommendations for international use published in the form of standards, technicalreports or guides and they are accepted by the National Committees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.International Standard IEC 255-21-3 has been prepared by IEC technical committee 95:Measuring relays and protection equipment.The text of this standard is based on the following documents:DISReport on VotingAmendment to DISReport on Voting41 B(CO)54*41 B(CO)5741 B(CO)5841 B(CO)69Full information on the voting for the approval of this standard can be found in the reporton voting indicated in the above table.Annex A is for information only.* Subcommittee 41 B has been changed into new technical committee 95.SIST IEC 60255-21-3:1995
255-21-3 ©IEC:1993- 7 -ELECTRICAL RELAYS —Part 21: Vibration, shock, bump and seismic testson measuring relays and protection equipment —Section 3: Seismic tests1 Scope and objectThis International standard is one of a series of parts specifying the vibration, shock,bump and seismic requirements applicable to electromechanical and static measuringrelays and protection equipment, with or without output contacts.This standard includes two alternative types of seismic tests (see annex A):-the single axis sine sweep seismic test (method A); and-the biaxial multi-frequency random seismic test (method B).During preparation of this standard, it was determined that the number of countries inwhich the first test method was preferred was about equal to the number of countries inwhich the second method was preferred. For this reason both methods have beenretained, and neither have been identified as reference (or "referee") method.The requirements of this standard are applicable only to measuring relays and protectionequipment in a new condition.The tests specified in this standard are type 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 referencesThe following normative documents contain provisions which, through reference in thistext, constitute provisions of this International Standard. At the time of publication, theeditions indicated were valid. All normative documents are subject to revision, and partiesto agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the normative documents indicatedbelow. Members of IEC and ISO maintain registers of currently valid InternationalStandards.SIST IEC 60255-21-3:1995
255-21-3 ©IEC:1993- 9 -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 Ff: Vibration - Time-history methodIEC 68-3-3: 1991, Environmental testing - Part 3: Guidance - Seismic test methods forequipmentsIEC 255-21-1: 1988, Electrical relays - Part 21: Vibration, shock, bump and seismic testson measuring relays and protection equipment - Section 1: Vibration tests (sinusoidal)IEC 255-21-2: 1988: Electrical relays - Part 21: Vibration, shock, bump and seismic testson measuring relays and protection equipment - Section 2: Shock and bump testsISO 2041: 1990, Vibration and shock - Vocabulary3 DefinitionsFor definitions of general terms not defined in this standard, reference should be made to:-IEC International 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 255-21-1and IEC 255-21-2;-ISO 2041.3.1 Single axis sine sweep seismic testA test during which a specimen is submitted to sweeps of sinusoidal vibration in the threeorthogonal axes of the specimen in turn, in terms of constant displacement and/orconstant acceleration, within a standard frequency range.NOTE – The term specimen includes any auxiliary part which is an integral functional feature of the measur-ing relay protection equipment under test.3.2 Biaxial testA test during which a specimen is submitted to stresses in the horizontal and vertical axessimultaneously.SIST IEC 60255-21-3:1995
255-21-3 © IEC:1993— 11 —3.3 Biaxial multi-frequency random seismic testA test during which a specimen is submitted to a random sequence of stresses with a testresponse spectrum which reproduces the standard response spectrum by a biaxial multi-frequency input motion.3.4 Standard response spectrumA response spectrum whose shape shall be according to figure 1, and whose mainparameters are the damping and the zero period acceleration defined below.3.5 DampingA generic term ascribed to the numerous energy dissipation mechanisms in a system.In practice, damping depends on many parameters such as construction, mode of vibra-tion, strain, applied forces, velocity, materials, joint slippage, etc.3.6 Zero period accelerationHigh frequency asymptotic value of acceleration of the response spectrum (see figure 1).NOTE – The zero period acceleration is of practical significance as it represents the largest peak value ofacceleration in a time-history. This is not to be confused with the peak value of acceleration in theresponse spectrum.3.7 Random motion sampleSample of random motion record modified in frequency range and amplitude so as toproduce the required or the standard response spectrum.3.8 Time-historyRecording, as a function of time, of acceleration or displacement or velocity, resulting froma given event (see figure 2).3.9 Strong part of the time-historyThe strong part of the time-history is the part of the time-history from the time when theplot first reaches 25 % of the maximum value to the time when it reaches for the last timethe 25 % level(see figure 2).4 Requirements for single axis sine sweep seismic test (method A)4.1 Main parametersThe main parameters of the single axis sine sweep seismic test are the following:—frequency range;-acceleration;—displacement amplitude below the cross-over frequency;-sweep rate and number of sweep cycles.SIST IEC 60255-21-3:1995
255-21-3 ©IEC:1993– 13 –4.2 Test apparatus and mountingThe required characteristics of the vibration generator and fixture, together with the mount-ing requirements, shall be as follows. The characteristics apply when the specimen ismounted on the generator.4.2.1 Basic motionThe basic motion shall be a sinusoidal function of time, and such that the fixing point ofthe specimen moves substantially in phase and in straight parallel lines along a specifiedaxis, subject to the requirements of 4.2.2 and 4.2.3.4.2.2 Transverse motionThe maximum vibration amplitude at the check points in any axis perpendicular to thespecified axis shall not exceed 50 % of the specified amplitude.4.2.3 DistortionThe acceleration distortion measurement shall be carried out at the reference point, whichshall be declared by the manufacturer.The distortion, as defined in 3.9 of IEC 255-21-1, shall not exceed 25 %. In cases where adistortion value greater than 25 % is obtained, the distortion shall be noted, and agreedbetween manufacturer and user.4.2.4 Vibration amplitude tolerancesThe actual vibration displacement and acceleration amplitude along the required axis ofthe reference point shall be equal to the specified value, within a tolerance of ±15 %.4.2.5 Frequency range tolerancesThe frequency range shall be equal to the specified values (see 4.3 and 5.2.4) within thefollowing tolerances:±0,2 Hz, for the lower frequency 1 Hz;±1 Hz, for the upper frequency 35 Hz.4.2.6 SweepThe sweeping shall be continuous and the frequency shall change exponentially with time.The sweep rate shall be 1 octave per min ± 10 %.4.2.7 MountingThe specimen shall be fastened to the vibration generator or fixture by its normal meansof attachment in service so that the gravitational force acts on it in the same relativedirection as it would in normal use.The test fixture shall be rigid structure to minimize amplification and spurious motionwithin the frequency range of the test.SIST IEC 60255-21-3:1995
255-21-3 © IEC:1993- 15 -During the test, cable connections to the specimen shall be so arranged that they imposeno more restraint or mass than they would when the specimen is installed in its operatingposition.NOTE – Care should be taken to ensure that the specimen under test is not significantly affected by anymagnetic field generated by the vibration system.4.3 Test severity classesThe single axis sine sweep seismic test includes three different severity classes (0, 1, 2),the main parameters of which are referred to in table 1 below.When class 0 is declared, no single axis sine sweep seismic test applies.The nominal frequency range for this test is 1 Hz to 35 Hz and the cross-over frequency is8 Hz to 9 Hz (see figure 3).Table 1 - Single axis sine sweep seismic test parametersfor different severity classesClassPeak displacement belowthe cross-over frequencymmPeak acceleration abovethe cross-over frequency9nNumber ofsweep cycles in eachaxisx*y*x*y0–––––13,51,51,00,5127,53,52,01,01*x = horizontal axes of vibration.y = vertical axis of vibration.NOTES1For the frequency range of 1 Hz to 35 Hz and a sweep rate of 1 octave per min, 1 sweep cyclecorresponds to a test time of about 10 min.2 When considering the values scheduled it should be taken into consideration that sine sweep seismictest wave produces a higher severity level than other seismic test methods.5 Requirements for biaxial multi-frequency random seismic test (method B)5.1 Main parametersThe main parameters of the biaxial multi-frequency random seismic test are the following:SIST IEC 60255-21-3:1995
255-21-3 © IEC:1993- 17 –-frequency range;–standard response spectrum;–zero period acceleration;-number and duration of time-histories;–damping.In this standard, a damping value of 5 % is assumed as the standard value of damping(see annex A).5.2 Test apparatus and mountingThe required characteristics of the test generator and fixture, together with the mountingrequirements shall be as follows. The characteristics apply when the
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