00880425 PDF BRITISH STANDARD BS EN 60255 21 1 1996 IEC 255 21 1 1988 Incorporating Amendment No 1Electrical relays — Part 21 Vibration, shock, bump and seismic tests on measuring relays and protectio[.]
BRITISH STANDARD Electrical relays — Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment — Section 1: Vibration tests (sinusoidal) The European Standard EN 60255-21-1:1995 has the status of a British Standard BS EN 60255-21-1: 1996 IEC 255-21-1: 1988 Incorporating Amendment No BS EN 60255-21-1:1996 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 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 standard, through subcommittees and panels: Association of Consulting Engineers This British Standard, having been prepared under the direction of the General Electrotechnical Engineering Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1989 © BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference GEL/5 Draft for comment 86/27034 DC ISBN 580 17986 Amendments issued since publication Amd No Date of issue Comments 9095 September 1996 Indicated by a sideline in the margin BS EN 60255-21-1:1996 Contents Committees responsible National foreword Foreword Text of EN 60255-21-1 Publications referred to © BSI 07-1999 Page Inside front cover ii Inside back cover i BS EN 60255-21-1:1996 National foreword This Subsection of BS 142 has been prepared under the direction of the General Electrotechnical Engineering Standards Policy Committee It is identical with IEC Publication 255-21-2:1988 “Electrical relays — Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment — Section 1: Vibration tests (sinusoidal) ”, published by the the International Electrotechnical Commission (IEC) NOTE This Subsection should be read in conjunction with BS 142-0 “General introduction and list of Parts” In 1995 the European Committee for Electrotechnical Standardization (CENELEC) accepted IEC 255-21-1:1988 as European Standard EN 60255-21-1:1995 As a consequence of implementing the European Standard this British Standard is numbered as BS EN 60255-21-1:1996 and any reference to BS 142 Subsection 1.5.1:1989 should be read as reference to BS EN 60255-21-1:1996 Cross-references International standard Corresponding British Standard BS 2011 Basic environmental testing procedures Part 2.1 Tests IEC 68-2-6:1982 Part 2.1 Fc:1983 Test Fc Vibration (sinusoidal) (Identical) BS QC 160000 Harmonized system of quality assessment for electronic components Electrical relays Generic specification: electromechanical all-or-nothing relays IEC 255-7:1978 Part 1:1987 Test and measurement procedures (Identical) The international text refers to the International Electrotechnical Vocabulary The corresponding British Standard is BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms, of which Part 1:Group 03 Relay terminology is particularly relevant However, terms specific to the needs of protection relays are to be found in BS 142-1.1 General references to IEC 255 in this context should be taken as equivalent to references to BS 142 The British Standard related to ISO 2041:1975 is BS 3015 Glossary of terms relating to mechanical vibration and shock 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 from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to 8, 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 the inside front cover ii © BSI 07-1999 EUROPEAN STANDARD EN 60255-21-1 NORME EUROPÉENNE November 1995 EUROPÄISCHE NORM ICS 29.120.70 Descriptors: Measuring relays, sinusoidal vibration tests English version Electrical relays Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment Section 1: Vibration tests (sinusoidal) (IEC 255-21-1:1988) Relais 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 1: Essais de vibrations (sinusoïdales) (CEI 255-21-1:1988) Elektrische Relais Teil 21: Schwing-, Schock-, Dauerschock- und Erdbebenprüfungen an Meßrelais und Schutzeinrichtungen Hauptabschnitt 1: Schwingprüfungen (sinusförmig) (IEC 255-21-1:1988) 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 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 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 members 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 Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1995 Copyright reserved to CENELEC members Ref No EN 60255-21-1:1995 E EN 60255-21-1:1995 Foreword Contents The text of the International Standard IEC 255-21-1:1988, prepared by SC 41B1) Measuring relays and protection equipment, of IEC TC 41, Electrical relays, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 60255-21-1 on 1995-09-20 without any modification The following dates were fixed: — latest date by which the EN has to be implemented at national level by publication 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) 1996-10-01 Annexes designated “normative” are part of the body of the standard, Appendix A and Annex ZA are normative Annex ZA has been added by CENELEC Endorsement notice The text of the International Standard IEC 255-21-1:1988 was approved by CENELEC as a European Standard without any modification 1) IEC Foreword Scope Object Definitions 3.1 Vibration test (sinusoidal) 3.2 Vibration response test 3.3 Vibration endurance test 3.4 Fixing point (*) 3.5 Measuring points (*) 3.6 Check point (*) 3.7 Reference point (*) 3.8 Sweep-cycle (*) 3.9 Distortion (*) 3.10 Cross-over frequency 3.11 Standard acceleration of gravity Requirements for vibration tests (sinusoidal) 4.1 Test apparatus and mounting 4.2 Test severity classes 4.3 Test procedure Criteria for acceptance 5.1 Acceptance criteria for vibration response test 5.2 Acceptance criteria for vibration endurance test Appendix A Output circuit response during vibration response test Annex ZA (normative) Normative references to international publications with their corresponding European publications Table I — Vibration response test parameters for different severity classes Table II — Vibration endurance test parameters for different severity classes Table III — Guide for selection of test severity classes Page 3 3 3 3 3 3 4 4 6 5 SC 41B has been replaced by IEC TC 95, Measuring relays and protection equipment © BSI 07-1999 EN 60255-21-1:1995 Scope This standard is part of a series specifying the vibration, shock, bump and seismic requirements applicable to measuring relays and protection equipment (with or without contacts) This standard includes two types of vibration tests: the vibration response test and the vibration endurance test, and is generally based upon IEC 68-2-6 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 tests Object The object of this standard is to state: — definitions of terms used; — test conditions; — standard test severity classes; — test procedure; — criteria for acceptance Definitions For definitions of general terms not defined in this standard, reference should be made to: — International Electrotechnical Vocabulary (IEV) [IEC 50]; — IEC 68-2-6; — relay standards published in the IEC 255 series; — ISO 2041 For the purpose of this standard the following definitions shall apply NOTE Definitions marked with (*) are derived from IEC 68-2-6 3.1 vibration test (sinusoidal) a test during which a specimen is submitted to sweeps of sinusoidal vibration in the three different axes of the specimen in turn, in terms of constant displacement and/or constant acceleration, within a standard frequency range NOTE The term “specimen” includes any auxiliary part which is an integral functional feature of the measuring relay or protection equipment under test 3.2 vibration response test a vibration test carried out on a measuring relay or protection equipment, energized under specified conditions, to determine its response to normal service conditions © BSI 07-1999 3.3 vibration endurance test a vibration test carried out on a non-energized measuring relay or protection equipment, with higher vibration levels than in normal service conditions, as an accelerated life test to simulate long-term vibration This test also simulates some transportation conditions 3.4 fixing point (*) part of the specimen in contact with the fixture or vibration table at a point where the specimen is normally fastened in service if a part of the real mounting structure is used as the fixture, the fixing points shall be taken as those of the mounting structure and not of the specimen 3.5 measuring points (*) the specific points at which data are obtained during the tests They are of two main types: check point and reference point 3.6 check point (*) a measuring point located on the fixture, on the vibration table or on the specimen as close as possible and rigidly connected to one of its fixing points 3.7 reference point (*) a measuring point chosen from the check points whose signal is used to control the test so that the requirements of this standard are satisfied 3.8 sweep-cycle (*) a traverse of the specified frequency range once in each direction, for example 10 Hz to 150 Hz and 150 Hz to 10 Hz 3.9 distortion (*) µ 2tot – µ 12 Distortion d = - ´ 100 (percentage) µ1 where: a1 = r.m.s value of the acceleration at the driving frequency atot = total r.m.s value of the applied acceleration (including the value of a1) EN 60255-21-1:1995 3.10 cross-over frequency that frequency at which the characteristic of a vibration changes from a constant displacement value versus frequency to a constant acceleration value versus frequency 3.11 standard acceleration of gravity the standard acceleration of gravity gn, where “n” indicates normal, having the value of 9.81 m/s2 In practice this value may be rounded to 10 m/s2 Requirements for vibration tests (sinusoidal) The main parameters of the vibration tests are the following: — frequency range; — acceleration; — displacement amplitude below the cross-over frequency, if any, — sweep rate and number of sweep cycles 4.1 Test apparatus and mounting The required characteristics of the vibration generator and fixture together with the mounting requirements shall be as follows The characteristics apply when the specimen is mounted on the generator 4.1.1 Basic motion The basic motion shall be a sinusoidal function of time and such that the fixing points of the specimen move substantially in phase and in straight parallel lines along a specified axis, subjected to the limitations of Sub-clauses 4.1.2 and 4.1.3 4.1.2 Transverse motion The maximum vibration amplitude at the check points in any axis perpendicular to the specified axis shall not exceed 50 % of the specified amplitude for basis motion 4.1.3 Distortion The acceleration distortion measurement shall be carried out at the reference point, which shall be declared by the manufacturer, and shall cover the frequencies up to 000 Hz The distortion as defined in Sub-clause 3.9 shall not exceed 25 % In cases where a distortion value greater than 25 % is obtained, the distortion shall be noted and agreed between manufacturer and user 4.1.4 Vibration amplitude tolerances The actual vibration displacement and acceleration amplitude along the required axis of the reference point shall be equal to the specified value, within a tolerance of ± 15 % 4.1.5 Frequency range tolerances The frequency range shall be equal to the specified values (Sub-clauses 4.2.1 and 4.2.2) within the following tolerances: — ± Hz for the lower frequency 10 Hz; — ± Hz for the upper frequency 150 Hz 4.1.6 Sweep The sweeping shall be continuous and the frequency shall change exponentially with time The sweep rate shall be octave per minute ± 10 % NOTE in particular cases a lower sweep rate can be chosen, e.g for relays and protection equipment having an operating time greater than 4.1.7 Mounting The specimen shall be fastened to the vibration generator or fixture by its normal means of attachment in service so that the gravitational force acts on it in the same relative direction as it would in normal use During the vibration 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 magnetic field generated by the vibration system 4.2 Test severity classes The vibration response test and the vibration endurance test include three different severity classes (0, 1, 2), the main parameters of which are referred to in Sub-clauses 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 the vibration response test and the vibration endurance test When Class is declared, no vibration tests apply 4.2.1 Vibration response test The frequency range for this test is 10 Hz to 150 Hz and the crossover frequency is 58 Hz to 60 Hz Table I below gives the main parameters of the test severity classes © BSI 07-1999 EN 60255-21-1:1995 Table I — Vibration response test parameters for different severity classes Peak acceleration above the cross-over frequency (gn) Peak displacement below the cross-over frequency (mm) Class Number of sweep cycles in each axis — — — 0.035 0.5 0.075 1.0 NOTE For the frequency range of 10 Hz to 150 Hz and a sweep rate of octave per minute, sweep cycle corresponds to a test time of about 4.2.2 Vibration endurance test The nominal frequency range for this test is also 10 Hz to 150 Hz; however this test shall be carried out with constant acceleration Table II below gives the main parameters of the test severity classes Table II — Vibration endurance test parameters for different severity classes Class Peak acceleration (gn) Number of sweep cycles in each axis — 1.0 2.0 — 20 20 NOTE For the frequency range of 10 Hz to 150 Hz and a sweep rate of octave per minute, 20 sweeps correspond to a test time of about 160 4.2.3 Recommendations for the selection of test severity classes The test severities are classified with respect to the ability of a measuring relay or protection equipment to withstand the mechanical vibrations likely to be experienced in a particular transportation or type of use, in accordance with Table III below Table III — Guide for selection of test severity classes Class Typical applications Measuring relays and protection equipment for which there are no vibration requirements Measuring relays and protection equipment for normal use in power plants, substations and industrial plants and for normal transportation conditionsa Measuring relays and protection equipment for which a very high security margin is required or where the vibration levels are very high, e.g shipboard application and for severe transportation conditionsa a The packaging of the measuring relay or protection equipment should be designed and implemented in such a manner that the severity class parameters will not be exceeded during transportation © BSI 07-1999 4.3 Test procedure The vibration displacement and acceleration amplitudes 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 tested as functional sub-units as agreed between manufacturer and user 4.3.1 The vibration response 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 loading applied to the appropriate circuits: — auxiliary energizing quantity(ies): rated value(s); — output circuit loadings: no loading except the monitoring device 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 manufacturer’s declared variation for no maloperation due to vibrations; 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 equipment (above for minimum measuring devices) The relay shall not operate b) The value of the characteristic quantity shall be above the operating value for maximum measuring relay or protection equipment (below for minimum measuring devices.) The relay shall not release Prior to the test the operating value(s) of measuring relays or protection equipment shall be measured under reference conditions 4.3.2 During the vibration response test, the measuring relay or protection equipment shall have its operating value(s) set at highest sensitivity By agreement between manufacturer and user, measuring relays and protection equipment may be classified at other settings NOTE When testing protection equipment which includes several measuring functions the vibration response test may be carried out to check only the function most sensitive to vibration, if known EN 60255-21-1:1995 4.3.3 During the vibration response test, the state of the output circuits (see Sub-clause 5.1.1) shall be determined by a monitoring device which measures the duration of the output circuit change of state, if any The time-measuring circuit of this monitoring device shall have a reset time of 0.2 ms, or less, in order to prevent it from responding to the integrated effect of a number of short-duration changes of state of the output circuit, e.g contact (see Appendix A) 4.3.4 The vibration endurance test shall be carried out, without energizing quantities or loads connected to the measuring relay or protection equipment, under the reference conditions stated in the relevant relay standard 4.3.5 The measuring relay or protection equipment shall be tested in its case with the cover, if any, in position, and any transportation restraints removed 4.3.6 The effects of the vibrations on the specimen under test shall be checked during and after the vibration response test and after the vibration endurance test Criteria for acceptance 5.1 Acceptance criteria for vibration response test 5.1.1 During the test, the measuring relay or protection equipment shall not maloperate It is considered not to have maloperated if the normal state(s) of its output circuit(s) has/have not changed for more than ms NOTE The manufacturer may also declare the values of peak acceleration and/or peak displacement for which no change of state longer than 10 4s occurs (see Appendix A) 5.1.2 The test shall not cause flags, or other forms of indications, to change their state permanently 5.1.3 After the test, the measuring relay or protection equipment shall still comply with the relevant performance specification and shall not have changed its setting by more than 0.5 times the assigned error, nor have suffered mechanical damage 5.2 Acceptance criteria for vibration endurance test 5.2.1 The test may cause flags, or other forms of indications, to change their state 5.2.2 After the test, the measuring relay or protection equipment shall still comply with the relevant performance specification and shall not have suffered mechanical damage © BSI 07-1999 EN 60255-21-1:1995 Appendix A Output circuit response during vibration response test An increasing number of applications of measuring relays and protection equipment may include devices, e.g thyristors, with very short operating times for which the test requirements of ms may be inadequate It is desirable to know the peak acceleration and peak displacement for which there is no risk of the output circuit changing state For amplitudes above these values there would, for example, be a risk of a contact being damaged by attempting to interrupt the resulting output circuit load current after a momentary change of state caused by vibration Insufficient data are at present available for many designs of relays and protection equipment to make realistic proposals for standard acceleration and displacement amplitude withstand values at which no undesirable change of state will occur In order to obtain these data, it is recommended that measuring relays and protection equipment should be tested in accordance with Subclause 4.3 but with an acceptance criterion of 10 4s for the change of state of the output circuit, as in Clause 39 of IEC 255-7 The results should be declared by the manufacturer For guidance, it should be noted that measurements made on measuring relay cases in several power stations indicate that the peak acceleration to be expected in service is typically not above 0.1 gn © BSI 07-1999 EN 60255-21-1:1995 Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies (including amendments) NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies Publication Year Title EN/HD IEC 50 series International electrotechnical vocabulary (IEV) — IEC 68-2-6 1982 Basic environmental testing procedures Part 2: Tests — Test Fc and guidance: Vibration (Sinusoidal) HD 323.2.6 S2 IEC 255-7 1978 Electrical relays — Part 7: Test and measurement — procedures for electromechanical all-or-nothing relays — ISO 2041 1975 Vibration and shock — Vocabulary — — a Year — a 1988 HD 323.2.6 S2 is superseded by EN 60068-2-6:1995, which is based on IEC 68-2-6:1995 © BSI 07-1999 BS EN 60255-21-1:1996 Publications referred to See national foreword © BSI 07-1999 BS EN 60255-21-1: 1996 IEC 255-21-1: 1988 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the 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