PNW 69-177 Ed. 1.0

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Electrical relays - Part 6: Measuring relays and protection equipmentRelais électriques - Sixième partie: Relais de mesure et dispositifs de protectionElectrical relays - Part 6: Measuring relays and protection equipment29.120.70RelejiRelays29.120.50Fuses and other overcurrent protection devicesICS:Ta slovenski standard je istoveten z:IEC 60255-6SIST IEC 60255-6:1995en01-avgust-1995SIST IEC 60255-6:1995SLOVENSKI
STANDARD



SIST IEC 60255-6:1995



IEC•NORMEINTERNATIONALEINTERNATIONALSTAN DARDCEIIEC255-6Deuxième éditionSecond edition1988Relais électriques —Partie 6:Relais de mesure et dispositifs de protectionElectrical relays —Part 6:Measuring relays and protection equipment© CEI 1988 Droits de reproduction réservés — Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niNo part of this publication may be reproduced or utilizedutilisée sous quelque forme que ce soit et par aucun procédé,in any form or by any means, electronic or mechanical,électronique ou mécanique, y compris la photocopie et lesincluding photocopying and microfilm, without permissionmicrofilms, sans l'accord écrit de l'éditeur.in writing from the publisherBureau central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève SuisseCommission Electrotechnique Internationale CODE PRIXInternational Electrotechnical Commission PRICE CODEMcJSgyHapoaHae 3neMrporexHN4ectian HoMNCCHA• Pour prix, voir catalogue en vigueurFor price, see current catalogueRSIST IEC 60255-6:1995



255-6 ©IEC— 3 —CONTENTSPageFOREWORD
5PREFACE 5SECTION ONE — GENERALClause1.Scope and object 2.Definitions7SECTION Two - REQUIREMENTS3.Standard values 94.Thermal requirements
235.Mechanical requirements
256.Limiting dynamic value
257.Accuracy
258.Rated burden
279.Insulation
2710.Additional requirements for static relays
2711.Contact performance
2912.Markings and data
29SECTION THREE — TEST METHODS13.Tests related to accuracy and operating characteristics
3114.Test conditions related to operating time for determining errors
3115.Tests for thermal requirements
3116.Tests for mechanical requirements
3317.Limiting dynamic value tests
3518.Contact performance tests
35APPENDIX A - Note on specified independent time relays
37SIST IEC 60255-6:1995



255-6 ©IEC— 5 —INTERNATIONAL ELECTROTECHNICAL COMMISSIONELECTRICAL RELAYSPart 6: Measuring relays and protection equipmentFOREWORD1)The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all theNational Committees having a special interest therein are represented, express, as nearly as possible, an international consensusof opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the National Committees in that sense.3)In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the textof the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between theIEC recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.PREFACEThis standard has been prepared by Sub-Committee 41 B: Measuring relays and protection equipment,of I E C Technical Committee No. 41: Electrical relays.This publication supersedes Publication 255-6 (1978) and its first supplement 255-6A (1980).The text of this standard is based on the following documents:Six Months' RuleReport on Voting41 B (CO)3941 B (CO)42Full information on the voting for the approval of this standard can be found in the Voting Reportindicated in the above table.The following IEC publications are quoted in this standard:Publications Nos.50: International Electrotechnical Vocabulary (I E V).50(05) (1956): Chapter 5: Fundamental definitions. (This publication has been superseded by Publications50(101, 111, 121, 131 and 151.)85 (1984): Thermal evaluation and classification of electrical insulation.158: Low-voltage controlgear.255: Electrical relays.255-0-20 (1974): Contact performance of electrical relays.255-5 (1977): Part 5: Insulation tests for electrical relays.255-11 (1979): Part II: Interruptions to and alternating component (ripple) in d.c. auxiliary energizing quantityof measuring relays.292: Low-voltage motor starters.337: Control switches (low-voltage switching devices for control and auxiliary circuits, includingcontactor relays).SIST IEC 60255-6:1995



255-6 ©IEC— 7 —ELECTRICAL RELAYSPart 6: Measuring relays and protection equipmentSECTION ONE - GENERAL1. Scope and objectThis standard specifies the general performance requirements of all electrical measuring relaysand protection equipment used in the electrotechnical fields covered by the I E C.It excludes relays used in the following electrotechnical fields:-telephony;-telegraphy;-signalling and blocking in railway systems;-devices covered by IEC Publications 158, 292 and 337.For special applications (marine, aerospace, explosive atmospheres, computers, etc.), it may beamplified by means of special requirements.Relays which are designed to meet the requirements prepared by other international standardiza-tion organizations (telecommunication, railways, etc.) shall comply with this standard when used inthe electrotechnical fields covered by the I E C, other than those excluded above.The requirements are applicable only to relays in new condition. All tests in this standard are typetests unless otherwise declared.The object of this standard is to state:1)definitions of terms used;2)nominal values relating to energizing and influencing quantities;3)requirements related to accuracy, thermal and mechanical performance;4)test methods;5)markings and data.2. DefinitionsFor definitions of general terms not defined in this standard, reference should be made to theInternational Electrotechnical Vocabulary (I E V) [I E C Publication 501 and first level documentsof the I EC Publication 255 series.For the purpose of this standard the following definitions shall apply.2.1 Single input measuring relayA relay which is designed to respond to a single input energizing quantity and where the meas-uring function is determined by a single energizing quantity.Note. - If single input measuring elements of the same type are packaged as protection equipment, e.g. 3-phase overcurrentrelays, they are to be considered as single input measuring relays.SIST IEC 60255-6:1995



255-6 ©I E C— 9 —2.2 Multi input measuring relayA relay which is designed to respond to more than one input energizing quantity and wherethe measuring function is determined by the interaction of the energizing quantities.2.3 Dependent time relay with increasing functionA dependent time relay whose operating time increases in accordance with an increase of thecharacteristic quantity.2.4 Dependent time relay with decreasing functionA dependent time relay whose operating time decreases in accordance with an increase of thecharacteristic quantity.SECTION TWO - REQUIREMENTS3. Standard values3.1 Input energizing quantities3.1.1 GeneralNo standard values of input energizing quantities are specified. Those given below are preferredvalues, of which those underlined have found greater acceptance and are expected to becomestandard values in the future.3.1.2 Primary relaysNo preferred rated values for a. c. or d.c.3.1.3 Secondary relaysa)A.C. voltages (r.m.s.)The preferred rated values of voltages for a. c. are those given below, together with thosevalues multiplied by ', or UN/J. For single phase railway systems multiply 100 V and 110 Vby 0.5.100 V; 110 V; 115 V; 120 V; 200 V; 220 V; 240 V; 480 V.b)A.C. currents (r.m.s.)The preferred rated values of currents for a. c. are given below:0.5 A; 1 A; 2 A; 5 A.3.1.4 Shunt (energized) relaysThe preferred rated values of d.c. voltages are given below:30 mV; 45 mV; 50 mV; 60 mV; 75 mV; 100 mV; 150 mV; 200 mV; 300 mV; 600 mV.3.2 Auxiliary energizing quantitiesThe rated values shall be selected from the following:SIST IEC 60255-6:1995



255-6 © IEC— 11 —3.2.1 GeneralNo standard values for auxiliary energizing quantities are specified. Those given below are pre-ferred values, of which those underlined have found greater acceptance and are expected to becomestandard values in the future.3.2.2 A. C. voltages (r. m. s.)24 V; 48 V; 100/ V; 110/-■./j V; 120/-■ V; 100 V; 110 V; 115 V; 120 V; 127 V; 200 V; 220 V.415/VJV;380V;415V;480V;500V;660V.3.2.3 A.C. currentThere are no preferred rated values for a. c. currents.3.2.4 D. C. voltage12 V; 24 V; 48 V; 60 V; 110V; 125 V; 220 V; 250 V; 440 V.3.2.5 D. C. currentThere are no preferred rated values for d.c. current.3.2.6 Operative ranges of auxiliary energizing quantitiesThe limits of the operative range for each auxiliary energizing quantity shall be as specified inlower level documents.Rated values of non-preferred ranges shall be distinguished from the values of the limits ofthe operative range by suitable means, for example by underlining, or by use of a special typeface.The values shall be marked on the relay. Examples are shown in Table I.3.2.7 Preferred operative range of auxiliary energizing quantitiesThe limits of the preferred operative range are 80%-110% of the rated value. For d.c. thesevalues are mean values. For permitted peak-ripple factor see Table II (Note 6).For a. c. auxiliary energizing quantities, in special cases, for example frequency measuring relays,the auxiliary energizing quantities may require larger limits.Note. – In some circumstances, particularly in the case of energization from certain storage batteries, the limits of the opera-tive range may necessarily differ from the preferred value. In these circumstances the manufacturer shall declare thelimits of the range and the corresponding rated value.SIST IEC 60255-6:1995



255-6 © IEC— 13 —TABLE IExamples of marking the operative range of an auxiliary energizing quantityExample(V)MeaningNormal case basedA single rated220Rated value: 220 Von 80% to 110% rangevalueOperative range:80% to 110% of 220 VTwo rated values220Rated values: 220 V and 250 V.250Operative ranges 80% to 110% of220 V and 250 VLarge range e.g.d.c./d.c. convertor40 to 128Operative range 80% of 40 V to110% of 128 VExample of non-preferred rangeA single rated value165-220-253Operative range:75% to 115% of 220 V3.3 FrequencyThe standard rated values of frequency shall be selected from the following:1613 Hz; 50 Hz; 60 Hz.3.4 Values of resetting and disengaging ratiosTo be specified in lower level documents.3.5 Contact circuitsThe standard values of voltages and currents for contact circuits shall be taken from I E C Pub-lication 255-0-20.3.6 Independent specified timesThere are no rated values for independent specified times; however, in the case of relays having atime-setting range, maximum values are proposed in Appendix A.3.7 Standard reference values of influencing quantities and factors and standard values of their nominaland extreme ranges3.7.1 Standard reference values of influencing quantities and factorsThe standard reference values of influencing quantities and factors and the associated testtolerances are given in Table II.The manufacturer shall declare the effects of self heating of relays mounted as in normal servicewhere these are significant, i. e. if they cause changes in accuracy which are of the same order ofmagnitude, or greater than the assigned error.SIST IEC 60255-6:1995



255-6 © IEC— 15 —3.7.2 Standard values of the limits of the nominal ranges of influencing quantities and factorsa)Nominal range of ambient temperatureThe standard nominal range shall be selected from the following:–5°C to +40°C;0°C to +45°C; –10°C to +55°C; –25°C to +40°C; –25°C to +55°C.b)Nominal range of frequencyThe standard values of the limits of frequency shall be chosen from one of the followingranges:–5%to +5%; –5%to +10%; –10%to +10%.c)Nominal ranges of other influencing quantities and factorsThe values of the limits of the nominal ranges of other influencing quantities and factors aregiven in Table III.3.7.3 Limits of extreme range of ambient temperatureThe standard values of the limits of the extreme range of ambient temperature are:–25 °C and +70°C.Relays shall be capable of withstanding temperatures within this range under conditions oftransport, storage and installation without suffering irreversible changes. This requirement is onlyapplicable to non-energized relays.Notes 1. - For relays which cannot withstand this condition, the manufacturer should declare the maximum range.2. - For certain low temperature areas of the world, a low level temperature of – 40 °C may apply.SIST IEC 60255-6:1995



255-6 © I E C— 17 —TABLE IIStandard reference conditions and test tolerances of influencing quantities and factorsInfluencing quantityor factorReference condition(see Note 1)Test tolerances7aüAmbient temperature20 °C± 2 °CAtmospheric pressure86 kPa to 106 kPa-Relative humidity45% to 75%(See Note 2)PositionAs specified in lower leveldocuments2° in any direction or for staticrelays, as specified in lower leveldocumentsExternal magnetic fieldZeroInduction equal to or less than0.5 mTct'toA.toN0aaca0ÿT.C.)asUInput energizing voltage(s)As specified in lowerlevel documentsInput energizing current(s)Phase angle between input energizingquantitiesFrequencyRated value± 0.5% (see Note 3)WaveformSinusoidalDistortion factor 2%(see Notes 4 and 5)Alternating component in d.c. (ripple)(See Note 6)Zero6% (see Note 7)D.C. transient component in a.c.As specified in lowerlevel documentsSetting valueBalanced polyphase suppliesFully balanced(See Note 8)gHParameter(s) of characteristiccurveAs specified in lowerlevel documentsSetting valuegn'toNtoN0T‰xcVoltage or currentRated value(s)As specified in lowerlevel documentsFrequencyRated value± 0.5% (see Note 3)WaveformSinusoidalDistortion factor 2%(See Notes 4 and 5)Alternating component in d.c.(see Note 6)Zero6% (see Note 7)D. C. transientcomponents in a.c.As stated in lowerlevel documentsSIST IEC 60255-6:1995



255-6 © I E C— 19 —Notes 1. - National standards, special conditions of application or the character of the relay may necessitate the use of non-standard values. In such cases, the manufacturer shall state the reference values and tolerances. For instance,special applications may necessitate the use of 40 °C as the reference value of ambient temperature insteadof 20 °C.2.- During tests of variations due to temperature, this range of humidity may be exceeded provided that no condensa-tion occurs.3.- If the performance of the relay is independent of the frequency, the tolerance may be larger. When the relay ishighly frequency-dependent and great accuracy is required, smaller tolerances may be specified.Umm — Uv6.- Alternating component in d.c.: this is defined as 100Uowhere:Umm = maximum instantaneous voltageLA, = minimum instantaneous voltageU. = d.c. component7.- In certain cases, as agreed by manufacturer and user, smaller tolerances may be necessary.8.- In the absence of any specific requirements being given in lower level documents, the following requirements shallapply:a)Each of the voltages (between any two lines and between each line and neutral) of a polyphase symmetricalsystem shall not differ by more than 1% from the average of such voltages.b)Phase currents shall not differ by more than iWo from the average of the system currents.c)The angles between each current and its corresponding phase-to-neutral voltage shall be the same, subject to atolerance of two electrical degrees.4.- If the performance is very dependent on the waveform, smaller tolerances may be specified.5.- Distortion factor: the ratio between the r.m.s. value of the harmonic content obtained by subtracting the funda-mental wave from a non-sinusoidal periodic quantity and the r.m.s. value of the non-sinusoidal quantity. It isusually expressed as a percentage (IEV 05-02-120).SIST IEC 60255-6:1995



255-6 © IEC— 21 —TABLE IIIStandard values of the limits of the nominal ranges of influencing quantities and factorsInfluencing quantity or factorNominal range4)NoN0Ambient temperatureSee Note 1 and Sub-clause 3.7.2Atmospheric pressure80 kPa to 110 kPaRelative humidityAs specified in lower level documents(see Note 2)Position5° in any direction from reference position or,for static relays, as specified in lower leveldocumentsExternal magnetic fieldAs specified in lower level documents5n.9-•N Iv5.c cU 0Input energizing voltage(s)As specified in lower level documentsInput energizing current(s)Phase angle between input energizingquantitiesWaveformFrequencySee Sub-clause 3.7.2D.C. transient component in
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