IEC_60654-2-1979_amd1-1992_scan.pdf

NORME?CEIINTERNATIONALE?I ECINTERNATIONAL?654-2STANDARD?1979AMENDEMENT 1AMENDMENT 11992-10Amendement 1Conditions de fonctionnement pour les matrielsde mesure et commande dans les processusindustrielsPartie 2:AlimentationAmendment 1Operating conditions for industrial-processmeasurement and control equipmentPart 2:Power CEI 1992 Droits de reproduction rservs Copyright all rights reservedBureau central de la Commission Electrotechnique Internationale 3,rue de Varemb Genve SuisseIECCommission Electrotechnique Internationale CODE PRIXInternational Electrotechnical Commission PRICE CODEMe,eayHapoaHaH 3neHTpoTexHH4ecriaR HOMHCCHA?Pour prix,voir catalogue en vigueurFor price,see current catalogueLICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.65(BC)4565(BC)47Rgle des Six MoisRapport de vote-2-?654-2 amend.1 CEIAVANT-PROPOSLe prsent amendement a t tabli par le sous-comit 65A:Aspects systmes,du comitdtudes n 65 de la CEI:Mesure et commande dans les processus industriels.Le texte de cet amendement est issu des documents suivants:Le rapport de vote indiqu dans le tableau ci-dessus donne toute information sur le voteayant abouti lapprobation de cet amendement.Page 144.2.4 Dphasage dune source dalimentation en courant alternatif polyphasRemplacer le paragraphe existant par le suivant:4.2.4 Dsquilibre de tension dans un rseau triphasConformment la CEI 50(604)*,le taux de dsquilibre dans un rseau dalimentationtriphas est lexpression du degr de dsquilibre par le rapport,exprim en pourcentage,entre la valeur efficace de chacune des composantes inverse ou homopolaire et celle dela composante directe de la tension.NOTES1?Cette dfinition englobe en mme temps les dsquilibres en grandeur et en phase.2?Pour choisir une limite la valeur du taux de dsquilibre,il y a lieu de prciser la composantesymtrique laquelle cette limite sapplique.Quatre classes de valeurs limites sont dfinies:4.2.4.1 Taux de dsquilibre infrieur 1%.4.2.4.2 Taux de dsquilibre infrieur 2%.4.2.4.3 Taux de dsquilibre infrieur 5%.4.2.4.4 Spcial:le taux de dsquilibre est suprieur ou gal 5%.*CEI 50(604):1987,Vocabulaire Electrotechnique Internationale(VEI)Chapitre 604:Production,transportet distribution de lnergie lectrique:Exploitation.LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Six Months RuleReport on Voting65(CO)4565(CO)47654-2 Amend.1 IEC?-3-FOREWORDThis amendment has been prepared by sub-committee 65A:System aspects,of IECtechnical committee No.65:Industrial-process measurement and control.The text of this amendment is based on the following documents:Full information on the voting for the approval of this amendment can be found in theVoting Report indicated in the above table.Page 154.2.4 Phase angle of a polyphase a.c.power supplyReplace the existing subclause by the following:4.2.4 Voltage unbalance in a three-phase systemAccording to IEC 50(604)*,the unbalance factor in a three-phase supply system is thedegree of unbalance expressed by the ratio(in per cent)between the r.m.s.value of thenegative sequence or the zero sequence component and the positive sequencecomponent of voltage.NOTES1?That definition includes both phase and magnitude unbalances.2 When choosing a limit value for the unbalance factor,the symmetrical component to which it appliesshould be stated.Four sets of limit values are listed:4.2.4.1 Unbalance factor less than 1%.4.2.4.2 Unbalance factor less than 2%.4.2.4.3 Unbalance factor less than 5%.4.2.4.4 Special:Unbalance factor is greater than(or equal to)5%.IEC 50(604):1987,International Electrotechnical Vocabulary(lEV)Chapter 604:Generation,transmission and distribution of electricity Operation.LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.ICS 25.040.40Typeset and printed by the WC Central OfficeGENEVA,SWITZERLANDLICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.