pub 255-11 rev 1979

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-___--I E 255 PT 11 77 844871~~ O021181~ 8 Publicat ion 25

~~ ~~

C O M M I S S I O N L E C T R O T E C H N I Q U E I N T E R N A T I O N A L EN O R M E D E L A C E 1

I N T E R N A T I O N A L E L E C T R O T E C H N I C A L C O M M I S S I O NI E C S T A N D A R DPublicat ion 255-1 1

Premire dition- irst edition1 9 7 9

R e l a is l e c t r iq u e sOnzime partie: Interruption s et composante alternativ e des grandeursdal imentation auxi l iaires courant continu pour relais de mesure

l e c t r i c al r e l a y sPart 11: Interruptio ns to and alternating component rip ple)

in d.c. aux i l iary energizing quant i ty of measuring relays

Droits de reproduction rservs- opyright - al l r ights reservedBureau Central de la Commission Electrotechnique Internationale

Genve Suisse1, rue de Varemb

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I E 255 P T * 3 L i 9 m 4 8 4 4 8 9 3 002LL82 T m

Rvision de la prsente publication Revision of this publicationLe contenu technique des publications de la C E1 est constam-ment revu par ia Commission afin dassurer quil reflte bien ltatactuel de la technique.

The technical content of I E C publications is kept underconstant review by the IEC, thus ensuring that the contentreflects current technology.Les renseignements relatifs ce travail de rvision, ltablisse-ment des ditions rvises et aux mises jour peuvent 2trc obtenus

auprs des Comits nationaux de la CE 1 et en consultant les docu-ments ci-dessous:

Information on the work of revision, the issue of revisededitions and amendment sheets may be obtained from I E CNational Committees and from the following IE C sources:

0 Bulletin de la CE 1 0 I E C BulletinRapport dactivit de la CE1Publi annuellementCatalogue des publications de la C E 1Publi annuellement

0 Report on I E C ActivitiesPublished yearly

0 Catalogue of I E C PublicationsPublished yearly

Terminologie TerminologyEn ce qui concerne la terminologie gnrale, le lecteur sereportera la Publication 50 de la CEI: Vocabulaire Electro-technique International (V.E.I.), qui est tablie sous forme dechapitres spars traitant chacun dun sujet dfini, lIndexgnral tant publi sparment. Des dtails complets sur leV.E.I. peuvent tr e obtenus sur demande.Les termes et dfinitions figurant dans la prsente publicationon t t soit repris du V.E.I., soit spcifiquement approuvs auxfins de cette publication.

For general terminology, readers are referred to I E C Publi-cation 50: International Electrotechnical Vocabulary (I.E.V.),which is issued in the form of separate chapters each dealingwith a specific field, the General Index being published as asepara te booklet. Full details of the I.E.V. will be supplied onrequest.The terms and definitions contained in the present publicationhave either been taken from the I.E.V. or have been specificallyapproved for the purpose of this publication.

Symboles graphiques et littraux Graphical and letter symbolsPour les symboles graphiques, symboles littraux et signesdusage gnral approuvs par la CEI, le lecteur consultera:- la Publication 27 de ia CEI: Symboles littraux utiliser

en lectrotechnique ;la Publication 117 de la CEI: Symboles graphiques reconi-mands.

Les symboles et signes contenus dans ia prsente publicationont t soit repris des Publications 27 ou 117 de ia CEI, soitspkifiquement approuvs aux fins de cette publication.

For graphical symbols, and letter symbols and signs approvedby the I E C for general use, readers are referred to:I E C Publication 2 7 : Letter symbols to be used in electricaltechnology ;IEC Publication 1 1 7 : Recommended graphical symbols.

The symbols and signs contained in the present publicationhave either been taken from I E C Publications 27 or 117, orhave been specifically approved for the purpose of this publi-cation

Autres publications de la C E 1 tablies par le mme Other I E C publications prepared by the sameComit dEudes Technical Com mittee

Lattention du lecteur est attire sur la page 3 de la The attention of readers is drawn to the inside of the backcouverture, qui numre les autres publications de la CE1 cover, which lists other I EC publications issued by theprpares par le Comit dEtudes qui a tabli la prsente Technical Committee which has prepared the presentpublication. publication.


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*t

i ri rluUwH

C D U / U D C : 621.318.56/.b7.001.2(083.71) 621.311.6,072,2,018.3.00L 84LldL 0023383~ ~~ L =- -~C O M M I S S 1 O N L E C T R O T E C H N I Q E I N T E R N A T I O N A L E

N O R M E D E L A G E II N T E R N A T I O N A L E L E C T R O T E C H N I C A L C O M M I S S I O N

I E C S T A N D A R D

Publication 255-1 1Premire di t ion i rst edi t ion1979

Relais lectriquesOnzime partie: Interruptions et composante alternative des grandeurs

d alimentation auxilia ires courant continu pour relais de mesure

Electrical relaysPart 11: Interruptions to and alternating component (ripple)in d.c. auxilia ry energizing quantity of measuring relays

Mots cls : elais de mesure lectromagntiqueset/ou lectroniques, exigences, dfinitions,source d alimentation tension constante,application.

Key words :electromagnetic and/or electronicmeasuring relays, requirements,definitions, constant-voltagepower supply. application.

Droits de reproduction rservs- opyright - al l r ights reservedAucune partie de cette publication ne peut 8tre reproduite ni utilise s usquelque forme que ce soit et par aucun procd, lectronique ou mica-nique, y compris la photocopie et les microfilms, sans l accord crit de 18diteur.

No part of this publication may be reproduced or utilized in anyform or by any means, electronic or mechanical , including photocopyingand microfilm, without permission in writing from the publisher.

Bureau Central de la Commission Electrotechnique Internationale1, rue de VarembGenve, SuissePrix Fr. s. 20.-PriceInternational Electrotechnical ommissionYRIGHT International Electrotechnical Commissionensed by Information Handling Services

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I E 2 5 5

PRAMBULE . . . . . . . . . . . . . .PRFACE . . . . . . . . . . . . . . . . .

Articles1. Domaine dapplication. .

SECTIONUN NRALITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SECTION DEUX RESCRIPTIONS SE RAPPORTANT AUX INTERRUPTIONS D E LA GRANDEURDALIMENTATION AUXILIAIRE COURANT CONTINU =

2. Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6essais . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ;. .................... 6dinfluence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

8

3. Valeurs de rfrence normales des grandeurs et facteurs dinfluence et tolrances pour les4. Valeurs normales des limites des domaines nominaux des grandeurs et des facteurs5. Effets des interruptions de grandeur dalimentation en courant continu., . . . . . . . . . . . . . . . .

SECTION TROIS RESCRIPTIONS SE RAPPORTANT LA COMPOSANTE ALTERNATIVEDANS LA GRANDEUR DALIMENTATION AUXILIAIRE EN RGIME PERMANENT

6 Dfinition de la composante alternative. . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . . . . . . 87. Conditions pour la. dtermination de la variation due londulation. .................... 108. Valeurs nominales des limites du domaine nominal.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10ANNEXE otes dexplication au sujet des sources auxiliaires des relais de mesurestatiques . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . . . 12


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CONTENTSPage

55

FOREWORD. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .PREFACE. . . . .. .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .

SECTIONONE GENERAL,Clause1. Scope., . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

SECTION T W O EQUIREMENTS CONCER NING INTERRUPTIONSTO D.C. AUXILIARY ENERGIZING QUANTITY

2. Interruption .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . .3. Standard reference conditions and test tolerances of influencing quantities and factors. . . .

77

4. Standard values of the limits of the nominal range of influencing quantities and factors.. . 95 . Effects of interruptions to d.c. auxiliary energizing quantity.. . . . . . .. . . . . .. . . . . . . 9

SECTIONHREE EQUIREMENTS CONCERNING ALTERNATING COMPONENT RTPPLE)IN THE D.C . AUXILIARY ENERGIZING QUANTITY UN DER STEADY-STATE CONDITIONS

6 Definition of alternating component, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .7. Conditions for determination of effects due to ripple.. . . . . . . . . . . .. .. . . . . .. . . . . . .8 . Standard values of the limits of the nominal range.. . . . . . . . . . . . . . . . . . . . . . . . .

91111

APPENDIX xplanatory notes on auxiliary power supplies for static measuring relays. . . 13


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- 4 -

COMMISSION LECTROTECHNIQUE INTERNATIONALE

RELAIS LECTRIQUESOnzime p artie: nterruptions et composante .alternative des grandeurs

d'alimentation auxiliaires courant continu pour relais de m esurePRAMBULE

1) Les dcisions ou accords officiels de la CE1 en e qui concerne les questions techniques, prpars par des Comitsd'Etudes o sont reprsents tous les Comits nationaux s'intressant ces questions, expriment dans la plus grandemesure possible un accord international sur les sujets examins.2) Ces dcisions constituent des recommandations internationales et sont agres comme telles par les Comits nationaux.3) Dans le but d'encourager l'unification internationale, la CE 1 exprime le vu que tous les Comits nationaux adoptentdans leurs rgles nationales le texte de la recommandation de la CEI, dans la mesure o les conditions nationales lepermettent. Toute divergence entre la recommandation de la C E1 et la rgle nationale correspondante doit, dans la mesuredu possible, tre indique en termes clairs dans cette dernire.

PRFACELa prsente norme a t tablie par le Sous-Comit 41B: Relais de mesure, du Comit d'EtudesNo 41 de la CEI: Relais lectriques.Des projets furent discuts lors de la runion tenue Milan en 1977. Un projet, document41B(Bureau Central)ll, fut soumis l'approbation des Comits nationaux suivant la Rgle des SixMois en mai 1978.Les pays suivants se sont prononcs explicitement en faveur de la publication:

Afrique du Sud (Rpublique d')AllemagneAustralieAutricheBelgiqueCanadaEgYPteEspagneEtats-Unis d'Amrique

FranceItalieJaponNorvgePologneRoyaume-UniSudeSuisseTurquieCette norme est une publication de second niveau applicable aux relais de mesure comme il estspcifi dans le domaine d'application.

Autres pirblicatioiis de In CE I cites dans In prsente norme: ,Publications nor 50(131): Vocabulaire Electrotechnique International (V.E.I.) Chapitre 131: Circuits lectriques etmagntiques.

255-3: Relais lectriques roisime partie: Relais de mesure une seule grandeur d'alimentationd'entre temps non spcifi ou temps indpendant spcifi.255-4: Quatrime partie: Relais de mesure une seule grandeur d'alimentation d'entre tempsdpendant spcifi.


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INTERNATIONAL ELECTROTECHNICAL COMMISSION

ELECTRICAL RELAYSPart 11: Interruptions to and alternating component (ripple)in d.c. auxiliary energizing quantity of measuring relays

FOREWORD1) The formal decisions or agreements of the I E C on technical matters, prepared by Technical Committees on,u:hich all theNational Committees having a special interest therein are represented, express, as nearly as possible, an internationalconsensus of 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 that3) In order to promote international unification, the I E C expresses the wish that all National Committees should adopt thetext of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence

between the I E C recommendation and the corresponding national rules should, as far as possible, be clearly indicated inthe latter.

sense.

PREFACEThis standard has been prepared by Sub-committee 41B: Measuring Relays, of IEC TechnicalCommittee No. 41 : Electrical Relays.Drafts were discussed at the meeting held in Milan in 1977. A draft, Document 41B(CentralOffice)ll, was submitted to the National Committees for approval under the Six Months Rule inMay 1978.The following countries voted explicitly in favour of publication:

AustraliaAustriaBelgiumCanadaEgyptFranceGermanyItalyJapan

NorwayPolandSouth Africa (Republic of)SpainSwedenSwitzerland .TurkeyUnited KingdomUnited States of AmericaThis standard is a second-level publication applicable to measuring relays as specified in thescope.

Other I E C pirblicatiotis quoted in this stntidard:Publications Nos. 50(131): International Electrotechnical Vocabulary (I.E.V.) Chapter 131: Electric and Magnetic Circuits.

255-3: Electrical Relays Part 3: Single Input Energizing Quantity Measuring Relays with255-4:

Non-specified Time or with Independent Specified Time.Part 4: Single Input Energizing Quantity Measuring Relays with Dependent Specified Time.


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RELAIS LECTRIQUESOnzime partie : nterruptions et composante alternative des grandeursd?alimentation auxiliaires courant continu pour relais de mesure

SECTION UN NRALITS1. Domaine d?application

La prsente norme spcifie les prescriptions supplmentaires qui doivent tre satisfaites et lesparamtres supplmentaires dont les valeurs doivent tre dclares par le constructeur, relatifsrespectivement aux interruptions et aux composantes alternatives affectant les grandeursd?alimentation auxiliaires en courant continu des relais de mesure statiques.Les prescriptions contenues dans cette norme peuvent aussi s?appliquer certains relaislectromcaniques ayant une grandeur d?alimentation auxiliaire en courant continu.

SECTION DEUX RESCRIPTIONS SE RAPPORTANT AUX INTERRUPTIONSDE LA GRANDEUR D?ALIMENTATION UXLI IRECOURANT CONTINU

Cette section concerne les interruptions de la grandeur d?alimentation auxiliaire en courantcontinu considres comme une grandeur d?influence ayant une valeur normale de rfrence,mais pas de domaine nominal.

2. InterruptionUne interruption est dfinie aussi bien comme une coupure de que comme (cuncourt-circuit sur? ?alimentation par la grandeur d?alimentation auxiliaire*. Seules sont tudiesles interruptions uniques. Des essais spars peuvent tre ncessaires pour tablir les effetsde coupure ou du court-circuit de l?alimentation. Les conditions d?essai doivent tre spcifies.

3. Valeurs de rfrence normales des grandeurs et facteurs d?influence et tolrances pour les essaisTABLEAU

Grandeur ou facteur d?influence

Interruption

Conditions de rfrence

O m S

Tolrances pour les essais

Pas de tolrances

* I1 peut tre ncessaire d?ajouter une impdance en srie avec le circuit d?alimentation pour rendre possible lasuppression du court-circuit; l?effet de i?adjonction de cette impdance sur le fonctionnement du relais doit, s?ily a lieu, tre dclar par le constructeur.


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- 7 -

I

ELECTRICAL RELAYSPart 11: Interruptions to and alternating component (ripple)in d.c. auxiliary energizing quantity of measuring relays

SECTION ONE ENERAL1. scope

This standard specifies the additional requirements to be met, and the additional parameterswhose values are to be declared by the manufacturer, in respect of interruptions to, andalternating components (ripple) in the d.c. auxiliary energizing quantities of static measuringrelays.The requirements of this standard may also apply to certain electromagnetic relays having ad.c. auxiliary energizing quantity.

SECTION TWO EQUIREMENTS CONCERNING INTERRUPTIONSTO D.C. AUXILIARY ENERGIZING QUANTITY

This section deals with interruptions to the d.c. auxiliary energizing quantity which areconsidered as an influencing quantity having a standard reference value but no nominalrange.

2. InterruptionAn interruption is defined as either a break in, or a short circuit in, the auxiliary energizingquantity supply. Only single interruptions are considered. Separate tests may be needed toestablish the effects of a break in the supply and a short circuit in the supply. Test conditionsshall be specified.

3, Standard reference conditions and test tolerances of influencing quantities and factorsTABLE

IInfluencing quantity or factor I Reference condition Test tolerances

* It may be necessary to add additional series impedance into the supply circuit to enable the short-circuit conditionto be removed; the effect, if any, on the relay performance due to the addition of this impedance should bedeclared by the manufacturer.


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I E 2 5 5 P T * L L 7 78

4. Valeurs normales des limites des domaines nominaux des grandeurs et des facteurs dinfluenceTABLEAUI

Grandeur ou facteur dinfluence Domaine nominal

5. Effets des interruptions de

Interruption

grandeur dalimentation en courant continuLes effets doivent tre dtermins pour une interruption dune dure choisie parmi lesvaleurs suivantes et dclare par le constructeur: 2 10 0 0 00200 ms.Linterruption doit tre soudaine, cest--dire que la grandeur dalimentation auxiliaire doitvarier de O la valeur assigne ou vice versa. Le constructeur doit dclarer les conditionsdessai.

Note ans des cas spciaux, des donnes complmentaires peuvent tre prescrites pour mettre en vidence leffet dela vitesse de variation de la tension auxiliaire, par exemple les effets sur le convertisseur courantcoiitinu/conrant continu.Le constructeur dclare, sil y a lieu, les effets des interruptions sur:la prcision;le temps de fonctionnement;

- la performance de retour;dautres caractristiques, si elles sont significatives.

dalimentation auxiliaire est applique ou retire.Note oir lannexe A.

Le relais ne doit pas modifier son tat de sortie dune manire errone lorsque la grandeur

SECTION TROIS RESCRIPTIONS SE RAPPORTANT LA COMPOSANTE ALTERNATIVE DANS LA GRANDEURDALIMENTATION AUXILIAIRE EN RGIME PERMANENT

Cette section concerne la composante alternative dans la grandeur dalimentation auxiliairecourant continu, considre comme une grandeur dinfluence ayant une valeur normale derfrence et des limites de domaine nominal.6. Dfinition de la composante alternative

Dans cette norme la dfinition de la composante alternative en courant contind est:U m m - Uv

o : uU,,,, = tension instantane maximaleV = tension instantane minimale

U , = composante continue(Voir V.E.I. 131-03-14.)


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4. Standard values of the limits of the nominal range of influencing quantities and factorsTABLEI

I Influencing quantity or factor I Nominal range

5. Effects of interruptions to d.c. auxiliary energizing quantityThe effects shall be determined for an interruption having a duration selected from thefollowing values and declared by the manufacturer: 2 0 0 0 00200 ms.The interruption shall be sudden, i.e. the auxiliary energizing quantity shall be changed fromrated value to O or vice versa. The manufacturer shall declare the test conditions.

Note n special cases, additional data may be required to show the effects of the rate of change of auxiliaryvoltage, e.g. the effects on d.c/d.c. converters.The manufacturer shall declare the effects (if any) of the interruptions on:

- the accuracy;- the operating time;- the resetting performance;- any other characteristics, if significant.quantity is switched on or off.The relay shall not change its output state in a faulty manner when the auxiliary energizing

Note ee Appendix A.SECTION THREE EQUIREMENTS CONCERNING ALTERNATING

COMPONENT (RIPPLE) IN THE D.C. AUXILIARY. ENERGIZING QUANTITYUNDER STEADY-STATE CONDITIONS

This section deals with the alternating component (ripple) in the d.c. auxiliary energizingquantity which is considered as an influencing quantity with a standard reference value andlimits of nominal range.6 Definition of alternating component

In this standard the definition of the alternating component in d.c. is:where:

U m m U vu

Umm= maximum instantaneous voltageUV = minimum instantaneous voltageU0 = d.c. component(See I.E.V. 131-03-14.)


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I E 2 5 5 P T * L 3 i 9 4 8 4 4 8 9 3 0 0 2 3 1 9 2 207. Conditions pour la dtermination de la variation due l'ondulation

Pour les relais statiques il. est important que les effets de la composante alternative detension soient vrifis aux valeurs maximales et minimales de la tension en courant continu(110 et 80 de la valeur nominale).La forme de l'ondulation doit tre sinusodale (ou une onde redresse double alternance) etsa frquence double de la frquence du rseau, sauf indication contraire du constructeur.

Note oir l'annexe A.

8 . Valeurs nominales des limites du domaine nominalTABLEAUII

Grandeilr ou facteur d'influence

Composante alternative en courant continu

Domaine nominal

O 12 de la valeur assigne ia tension continue


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7. Conditions for determination of effects due to rippleFor static relays it is important that the effects of the alternating component should beassessed at the maximum and minimum values of the d.c. voltage (e.g. 110 and 80respectively of rated value).The ripple waveform shall be sinusoidal (or a full wave rectified sine wave) and have afrequency of twice the power system frequency, unless otherwise declared by the

manufacturer.Note ee Appendix A.

8. Standard values of the limits of the nominal rangeTABLEII

Influencing quantity or factor Nominal range


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I E 2 5 5 P T * L L 77 4 8 4 4 8 7 3 0 0 2 3 3 7 4 b2

ANNEXE ANOTES DEXPLICATION AU SUJET DES SOURCES AUXILIAIRES

DES RELAIS DE MESURE STATIQUES

Les prescriptions spcifiques relatives aux deux grandeurs dinfluence interruptions et(composante alternative en courant continu)), qui sappliquent aux alimentations auxiliaires, sontdonnes dans les tableaux I, II et III. Bien quelles concernent tous les relais de mesure ncessitantune source auxiliaire, ces grandeurs dinfluence sont surtout applicables aux relais statiques demesure. Comme il y a de nombreuses faons de raccorder des relais statiques de mesure unesource auxiliaire, cette annexe fournit des informations pour aider dterminer le pointdapplication des grandeurs dinfluence ci-dessus quand on veut dterminer leurs effets sur lesperformances du relais. Des observations sont aussi donnes pour expliquer les raisons du choix desconditions dessai.Bien que dans quelques cas les relais de mesure statiques soient autonomes pour leur alimentation,cest--dire quils tirent leur source courant continu de leur grandeur dalimentation dentre(courant ou tension), une grande proportion de relais statiques ncessite une source de tensionexterne spare pour leur fonctionnement correct. Celle-ci peut tre courant alternatif ou courantcontinu. Presque toujours une interface fait partie intgrante du relais de mesure entre la source detension externe gnrale et la source propre dalimentation des circuits statiques. Cette interfaceest par convention la source auxiliaire du relais pouvant tre un simple rgulateur/stabilisateur, unconvertisseur de courant alternatif/courant continu ou bien un convertisseur courant continu/courantcontinu. Cette source de puissance ralise gnralement trois fonctions principales :

a Elle rduit le niveau de tension de la source externe un niveau convenable pour les circuitsb Elle rduit les variations de la source externe en fournissant une tension interne stabilise (la

c Elle procure une barrire disolement et de filtrage entre la source propre et la source gnrale,de sorte que les tensions perturbatrices prsentes dans cette dernire (simules par les essais latension de choc et essais de perturbation en haute frquence - voir lannexe E de la Publication255-4: Quatrime partie: Relais de mesure une seule grandeur dalimentation dentre i tempsdpendant spcifi), ne soient pas transmises aux circuits statiques sensibles. Noter que les essaisspcifis lannexe E ont aussi pour but de couvrir les hautes frquences qui sont transmises la source gnrale du convertisseur courant continu/courant continu.La source dalimentation agit donc comme une ((interface dentre)) entre les tensions de la source

.

statiques.tension propre).

gnrale externe et de la source interne propre.Lorsque cela est ncessaire, les sources dalimentation pour relais de mesure statiques sontobtenues partir dune source de tension externe, soit en courant alternatif, soit en courant continu.

A moins quelle nait t prvue pour un groupe spcifique dquipement de protection, cette sourceexterne est situe dans le btiment central du poste ou de la sous-station et ne dpend pas duconstructeur de matriel de protection. Cette source alimente en gnral dautres quipements dansla sous-station et, en consquence, est sujette des variations de tension considrables et seraperturbe par des bruits, des tensions haute frquence, des ondulations, etc. Un exemple dunetelle source est la batterie du poste qui alimente les bobines de dclenchement, les relais deprotection, etc. Il est reconnu que des interruptions multiples peuvent se produire en pratique etlimpdance rsultante de la source en amont des bornes dentre du relais de mesure peut aussivarier de zro linfini. Cependant, pour des considrations pratiques dessai, les conditions dessai


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3APPENDIX A

EXPLANATORY NOTES ON AUXILIARY POWER SUPPLIESFOR STATIC MEASURING RELAYS

The specification requirements relating to the two influencing quantities interruptions and a.c.component in d.c. when applied to auxiliary power supplies, are given in Tables I, II et III.Although these are influencing quantities which are applicable to all measuring relays requiring anauxiliary supply, generally they are most applicable to static relays. Due to the many different waysin which an auxiliary supply may be derived and connected to static measuring relays, this appendixprovides supplementary information to assist in determining the point of application of the aboveinfluencing quantities when determining their effects on relay performance. Additional comments arealso given to explain the reasons for the choice of test conditions.Although in some cases static measuring relays are self-energized, Le. derive their internal d.c.supplies from their input energizing quantities (current or voltage transformer signals), a large

proportion of static relays require some form of separate external voltage source for correctoperation. This may take the form of either an a.c. or d.c. source. Almost invariably, some form ofinterposing unit is required as part of the measuring relay, acting as an interface between theexternal non-dedicated supply voltage and the internal dedicated supply voltage energizing thestatic circuitry. This unit is conventionally the relay power supply which may be either a simpleregulator/stabilizer unit or an a.c. to d.c. or d.c. to d.c. conversion unit. This power supply unitgenerally .performs three main functions :a It reduces the level of the external voltage source to a level suitable for static circuitry.b It reduces the variation of the external voltage source to provide an internal stabilized supplyvoltage (the dedicated voltage).c) It provides an insulation barrier and filter between the dedicated and non-dedicated voltages, sothat any noise or interference voltage signals present in the latter (typically represented by theimpulse voltage withstand and high-frequency disturbance tests - see Appendix E, Publication

255-4:Part 4: Single Input Energizing Quantity Measuring ,Relays with Dependent SpecifiedTime) are not impressed on sensitive static circuitry. Note that the tests specified in Appendix Eare also intended to cover high frequency being impressed on to the non-dedicated supply fromd.c./d.c. converters.The power supply unit thus acts as an input interface between the external non-dedicated andinternal dedicated supply voltages.When required, power supplies for static measuring relays are obtained from an external voltagesource, either a.c. or d.c. Unless provided for a specific range of protection equipment, this external

voltage source is likely to be located centrally in a typical power or sub-station layout and will notbe under the control of the manufacturer of the protection equipment. This voltage source willgenerally supply other equipment in the station and, as a result, will be subjected to considerablevoltage variations and will have general noise, high-frequency interference, ripple etc. voltagesimpressed on it. A typical example of such a source is the station tripping battery supplyingswitchgear trip coils, protection relays etc. It is recognized that multiple interruptions to supply mayoccur in practice and the resultant source impedance seen by the measuring relay input terminalsmay also vary from zero to infinity. However for practical testing considerations the test conditionsspecified in this standard have been restricted to single interruptions being either short-circuit or


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open-circuit conditions at the measuring relay terminals. Values of the period of interruptioncovering the range O to 200 m s have been specified. This is mainly to cater for faults on theauxiliary supply circuits and the resultant fuse blowing times.

Figures 1 and 2, page 16, show two common arrangements of power supply connection for staticrelays. In Figure 1, the external voltage source is connected directly to the measuring relays inputterminals. The relay power supply or input interface is located within the case and its dedicatedoutput voltage is connected to the relays static circuitry within the confines of the relay case.

In some designs of protection equipment, the power taken from the dedicated supply voltage andthe resultant dissipation within the power supply unit results in this having to be provided in aseparate case. In this application, the power supply unit is designed either directly by the relaymanufacturer, or designed to his specification to be suitable for defined protection equipment. Thecombination of power supply unit and measuring relay(s) is considered as a composite package,the power supply being an additional component which is necessary for its operation (i.e. themeasuring relay) and which is tested with it (see note to Sub-clause 2.1.1 of I E C Publication255-3: Part 3: Single Input Energizing Quantity Measuring Relays with Non-specified Time or withIndependent Specified Time). A typical example of this is shown in Figure 2 where the powersupply unit is housed in a separate case. The external power source is connected to its inputterminals and the power supply provides the interface between this non-dedicated supply and thededicated relay voltage supply, Generally it is customary to connect the output terminals of thepower supply unit to the relay(s) input terminals using screened connectors with particular typesof plugs and sockets. This provides protection against high-frequency interference voltages, preventsother power sources from being inadvertently used and also prevents the dedicated supply frombeing utilized for other equipment for which it is not intended.

In both cases discussed above, the effects of interruptions to and of ripple voltage occurringon the external voltage source must be considered at the equipment terminals to which this supplyis directly connected, i.e. a t points A as shown in Figures 1 and 2. Even when the power supplyunit is separately housed from the measuring relay, these influencing quantities are referred only tothe power supply unit input terminals provided that the unit is part of the measuring relay and hasbeen supplied and tested as an essential part of it. Note that if fuses are inserted between the powersupply unit and the relays (see Figure 2) then this condition should be considered as being coveredby the diagram of Figure 1, even though the power supply is actually external to the relay case.


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Circuits statiquesStatic circuits

Source de tension .externe loignesource gneraie) O Ovoir note 1)Remote externalvoltage sourcenon-dedicated supply)see Note 1)O

- --- O o OSource auxiliairedu relaisinterfacedentre) Relais statiquePower supply de mesureuni t Static measuringinput interface) relay

i l i l--- O oA. . .Alimentation dautres appareilsSupplies to other plant items Ilimentation de tensionpropre voir note 2) I Relais statiquesDedicated supply I de mesure Ivoltage see Note 2) -r0associsvoir note 3)Associated statici Omeasuring reiay s)lI see Note 3) IFIG. . ource auxiliaire externe.

. External power supply unit.262179

No tes:1 . -Cette source de tension peut tre courantalternatif ou courant continu.

. 2. -Des fils blinds et des connecteurs spciauxsont gnralement utiliss pour ces raccordements.3. -La source auxiliaire externe peut alimenterplusieurs relais.

Notes:I -This voltage source may be either a.c. or d.c.2. -Screened leads and special plugs and socketsare generally used for these connections.3. he externally mounted power supply may supplymore than one relay.

6 _

OSource de tensionexterne loignesource gnrale)voir note 1)Remote externalvoltage sourcenon-dedicated supply)see Note 1 )

O

Source auxiliaireinterfacedentre)Power supplyunitinput interface)

Alimentation de tension propreDedicated supply voltagelimentation dautres appareils,par exemple bobines de dclenchement,autres relais, etc.Supplies to other plant items,e. g. C. . rip coils, other relays,etc.Relais statique de mesureStatic measuring relay

261 179FIG.1. ource auxiliaire interne.Internal power supply unit.


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Autres publications de ia C E 1 prparespar le Comit Etudes NO 41255: - Relais lectriques.255-0-20 1974) Caractristiques fonctionnelles des contacts derelais lectriques.255-1-00 1975) Relais lectriques de tout-ou-rien .255-3 1971)

255-4 1976)255-5 1977)255-6 1978)255-7 1978)255-8 1978)

Troisime partie: Relais de mesure une seulegrandeur dalimentation dentre temps nonspcifi ou temps indpendant spcifi.Relais de mesure une seule grandeur dalimen-tation dentre temps dpendant spcifi.Cinquime partie: Essais disolement des relaislectriques.Sixime partie: Relais de mesure plusieurs gran-deurs dalimentation dentre.Septime partie: Mthodes dessai et de mesurepour les relais lectromcaniques de tout-ou-rien.Huitime partie : Relais lectriques thermiques.

Other I E C publications preparedby Technical Committee No. 41255 :-Electrical relays.255-0-20 1974) Contact performance of electrical relays.255-1-00 1975) All-or-nothing electrical relays.1255-3 1971)

255-4 1976)255-5 1977)255-6 1978)255-7 1978)255-8 1978)

Part 3: Single nput energizing quantity measuringrelays with non-specified time or with indepen-dent specified time.Single input energizing quantity measuring relayswith dependent specified time.Part 5 : Insulation tests for electrical relays.Part 6: Measuring relays with more than one inputenergizing quantity.Part 7: Test and measurement procedures forelectromechanical all-or-nothing relays.Part 8: Thermal electrical relays.

1 Cette publication remplace les Publications 255-1 et 255-2. This publication supersedes Publications 255-1 and 255-2.

Publicaiion 255-11

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pub 255-11 rev 1979