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220kV输电线路子导线断线原因分析与运行建议 Title:AnalysisofCausesforSub-ConductorBreakagein220kVTransmissionLinesandOperationalRecommendations Introduction: Transmissionlinesareanessentialcomponentoftheelectricalpowersystem,facilitatingtheefficienttransferofelectricityoverlongdistances.Sub-conductorbreakagein220kVtransmissionlinescandisruptpowerflow,resultingincostlyoutagesandpotentialimpactsonthereliabilityofthegrid.Thispaperaimstoanalyzethecausesofsub-conductorbreakageandprovideoperationalrecommendationstoenhancethemaintenanceandoperationof220kVtransmissionlines. I.AnalysisofCausesforSub-ConductorBreakage: 1.MechanicalStress: Oneoftheprimarycausesofsub-conductorbreakageismechanicalstress.Thisstresscanresultfromextremeweatherconditionslikehighwinds,iceaccretion,andseveretemperaturevariations.Theseconditionsmaygenerateexcessivetensionandbendingstress,causingthesub-conductortofracture.Therefore,itiscrucialtoassessthemechanicalandenvironmentalfactorsimpactingtransmissionlinesduringthedesignandconstructionstage. 2.Vibration: Vibrationisanothersignificantcontributortosub-conductorbreakage.High-intensityvibrationsneartransmissionlines,causedbyfactorssuchasnearbyindustrialactivity,wind-inducedoscillations,orelectricalcurrentimbalances,canleadtofatiguefailureandconsequentsub-conductorbreakage.Properanalysisofvibrationlevelsduringlinedesignandinstallationcanhelpmitigatethisrisk. 3.Galloping: Gallopingisauniquephenomenonwherewindcyclicallytiltsandupliftstransmissionlineconductors.Thisrepetitivemotioncanresultinaccumulatedfatiguedamageandeventualsub-conductorbreakage.Factorssuchasimproperconductortension,insufficientdampers,orinadequateclearancebetweenconductorsandsupportingstructurescanincreasethelikelihoodofgalloping.Enhancedmonitoringandregularinspectionsoftransmissionlineconditionscanhelpidentifypotentialgallopingrisks. 4.CorrosionandAging: Corrosionandagingprocessescandegradethephysicalpropertiesofsub-conductorsovertime,increasingtheriskofbreakage.Environmentalfactorslikehighhumidity,salte