IEC_60034-18-21-amd2ed1.0b.pdf

NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD34-18-211992AMENDEMENT 2AMENDMENT 21996-11 Commission Electrotechnique Internationale International Electrotechnical CommissionCODE PRIXPRICE CODEPour prix,voir catalogue en vigueurFor price,see current catalogueGAmendement 2Machines lectriques tournantes Partie 18:Evaluation fonctionnelle des systmes disolation Section 21:Procdures dessai pour enroulements fils Evaluation thermique et classificationAmendment 2Rotating electrical machines Part 18:Functional evaluation of insulation systems Section 21:Test procedures for wire-woundwindings Thermal evaluation and classification CEI 1996 Droits de reproduction rservs Copyright-all rights reservedBureau central de la Commission Electrotechnique Internationale 3,rue de Varemb Genve Suisse 2 34-18-21 amend.2 CEI:1996AVANT-PROPOSLe prsent amendement a t tabli par le sous-comit 2J:Classification des systmesdisolation des machines tournantes,du comit dtudes 2 de la CEI:Machines tournantes.Le texte de cet amendement est issu des documents suivants:FDISRapport de vote2J/51/FDIS2J/58/RVDLe rapport de vote indiqu dans le tableau ci-dessus donne toute information sur le vote ayantabouti lapprobation de cet amendement._Page 123.4.1 Fabrication des prouvettesLa correction ne concerne que le texte anglais.Page 143.7 Tempratures de vieillissement et dures des sous-cyclesRemplacer le quatrime alina par ce qui suit:Il convient de slectionner les tempratures de vieillissement et les dures des sous-cycles devieillissement dans le tableau 2 de la section 1.Remplacer,la page 16,le septime alina par ce qui suit:Par ailleurs,il convient de slectionner au moins deux autres tempratures de vieillissementsuprieures,qui seront spares par des intervalles de 20 K ou plus.Des intervalles de 10 Kpeuvent tre utiliss lorsque les essais sont effectus plus de trois tempratures devieillissement.Page 164.1.1 Procdure 1Remplacer le texte existant par ce qui suit:Cette procdure,qui utilise des modles de type motorette comme prouvettes,doit tredsigne sous la rfrence CEI 34-18-21,Procdure 1.34-18-21 Amend.2 IEC:1996 3 FOREWORDThis amendment has been prepared by subcommittee 2J:Classification of insulation systemsfor rotating machinery,of IEC technical committee 2:Rotating machinery.The text of this amendment is based on the following documents:FDISReport on voting2J/51/FDIS2J/58/RVDFull information on the voting for the approval of this amendment can be found in the report onvoting indicated in the above table._Page 133.4.1 Construction of test objectsReplace the text of the note by the following:NOTE It is recognized that markedly different values of test life can be obtained for the same insulatingmaterials,depending on insulation thicknesses and creepage distances.Page 153.7 Ageing temperature and subcycle lengthsReplace the fourth paragraph by the following:Ageing temperatures and lengths of ageing subcycles should be selected from table 2 ofSection 1.Replace,on page 17,the seventh paragraph by the following:In addition,at least two higher ageing temperatures should be selected,separated by intervalsof 20 K or more.Intervals of 10 K may be used when tests are made at more than three ageingtemperatures.Page 174.1.1 Procedure 1Replace the existing text by the following:This procedure,using motorette type models as test objects,shall be referred to as IEC 34-18-21,Procedure 1.4 34-18-21 amend.2 CEI:1996Page 225.1.1 Procdure 2Remplacer le texte existant par ce qui suit:Cette procdure,qui utilise comme prouvettes des moteurs rels,doit tre dsigne sous larfrence CEI 34-18-21,Procdure 2.5.1.2 Caractristiques gnralesLes corrections ne concernent que le texte anglais.Page 245.3.2 Moyens de chauffageLes corrections ne concernent que le texte anglais.34-18-21 Amend.2 IEC:1996 5 Page 235.1.1 Procedure 2Replace the existing text by the following:This procedure,using actual motors as test objects,shall be referred to as IEC 34-18-21,Procedure 2.5.1.2 General featuresReplace the fourth paragraph by the following:Even though actual motors are tested,the results may not be used to determine endurancetime in actual service in an absolute sense.The tests may be used as a means of classificationonly by comparing insulation systems.Page 255.3.2 Means of heatingReplace the first paragraph by the following:The mode of heat generation is dictated by the type of motor being used in the test and thelaboratory equipment available.Higher than normal winding temperatures can be obtained byincreasing motor losses by such means as enlarging the air gap,starting and reversing eachmotor,superimposition of direct current on the normal alternating current,or by increasing thetemperature of the air surrounding the motor.For temperature regulation during the heatageing portion of the cycle,the motors may be run at normal voltage and frequency with anelectrical control which automatically starts and stops or reverses the direction of rotation ofthe motors at intervals.Other acceptable means