文档名：低频电压下含纤维素颗粒变压器油绝缘特性及影响因素
摘要：低频变压器是低频输电系统中的关键设备,低频电压下的绝缘特性对其设计及运行具有重要意义.该文为了研究低频电压下含纤维素颗粒的变压器油的绝缘特性,分别研究20、30、40、50Hz四种频率交流电压下不同纤维素颗粒度(低、中、高)水平的变压器油击穿特性.同时,通过仿真及试验分析不同频率下变压器油中纤维素颗粒运动及积聚过程.研究结果表明,交流电压频率对变压器油中纤维素颗粒的成桥特性及击穿电压具有显著影响.随着频率的降低,纤维素颗粒向电极移动速度变慢并难以黏附在电极表面,减缓了纤维素颗粒在电极表面的积聚过程及杂质小桥的形成速度.相同频率交流电压下,变压器油击穿电压均随颗粒物浓度的升高而降低;相同纤维素颗粒浓度下,变压器油击穿电压随着频率的降低而增大.研究结果为低频变压器的设计及运行维护提供了基础数据支撑.
Abstract：Low-frequencytransformeristhekeyequipmentinlow-frequencytransmissionsystems,anditsinsulationcharacteristicsunderlow-frequencyvoltageareimportantforitsdesignandoperation.Inthispaperconductedtransformeroilbreakdowntestsatdifferentcelluloseparticlesize(low,medium,andhigh)levelstostudytheinsulationcharacteristicsoftransformeroilcontainingcelluloseparticlesunderlow-frequencyvoltage.Thetestfrequencywasselectedas20,30,40,and50Hz,andthecontentofcelluloseparticlesinoilsampleswasselectedaslow,medium,andhighparticlesizelevels.AccordingtotheIEC60156standard,thepressurewasincreasedstepbystepataconstantrateof2kV/stotheoilsamplebreakdown,andtheoilsampleintheoilcupwasreplacedevery6timesafterthebreakdown.Inordertoensuretheconsistencyofthetest,30timesofbreakdowntestswererepeatedrespectivelyateachfrequencyandparticlesizelevel,andtheeffectivevalueofbreakdownvoltagewasrecorded.TheWeibulldistributionmethodwasusedtoanalyzethetestresults.Thetestresultsshowthatatthelowparticlesizelevel,thebreakdownvoltageat50Hzistakenasthereference,andthebreakdownvoltageat20,30,and40Hzisincreasedby12.25%,25.62%,and39.14%,respectively.Atthehighparticlelevel,thebreakdownvoltageincreasesby21.45%,83.69%,and97.30%at20,30,and40Hz,respectively.Atthesametime,theaccumulationprocessofcelluloseparticlesattheelectrodewasobservedbyexperiments,andthemovementofcelluloseparticlesintransformeroilatdifferentfrequencieswasanalyzedbymulti-physicalfieldsimulation.Inthispaper,anobservationtestwascarriedoutonthemotioncharacteristicsofcelluloseparticlesfortransformeroilwithhighparticlesizelevels.18kVwasselectedasthetestvoltageandcarriedoutatroomtemperature.Thedistributionstateofcelluloseparticlesbetweenelectrodeswasobservedwithacamera.Finally,COMSOLfiniteelementsoftware"AC-DCmodule"and"Particletrackingmodule"areusedtosimulatethemotiontrajectoryofparticlesintheslightlyunevenfieldoftransformeroilunderfourfrequencies.Theresultsshowthattheagglomerationrateofparticlestowardstheelectrodeatalowfrequency20Hzwassignificantlylowerthanthatatapowerfrequency50Hz.Moreimpuritieswouldaccumulateneartheelectrodeat50Hz,andthebridgeofimpuritieswasbroaderthanthatat20Hz.TheresultsshowthattheACvoltagefrequencysignificantlyaffectsthebridgeformationcharacteristicsandbreakdownvoltageofcelluloseparticlesintransformeroil.Whenthetransformerisrunning,thebreakdownvoltageoftransformeroilincreaseswiththedecreaseofACvoltagefrequency,andthehigherthegranularitylevel,themoresignificantthedifferenceinbreakdownvoltagebetweenfrequencies.ThefrequencyofACvoltagewillaffectthemovingspeedofimpurityparticlesandtheformationprocessofimpurityBridgesintransformeroil.Theresearchresultsofthispaperprovideessentialdatasupportforthedesign,operation,andmaintenanceoflow-frequencytransformers.
作者：刘云鹏 赵家莹 刘贺晨 赵涛 尹子澳 Author：LiuYunpeng ZhaoJiaying LiuHechen ZhaoTao YinZiao
作者单位：华北电力大学河北省绿色高效电工新材料与设备重点实验室保定071003;新能源电力系统国家重点实验室(华北电力大学)北京102206华北电力大学河北省绿色高效电工新材料与设备重点实验室保定071003
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(4)
分类号：TM41
关键词：变压器油 交流电压 低频输电 纤维素颗粒 运动
Keywords：Transformeroil alternatingcurrentvoltage low-frequencytransmission celluloseparticles movement
机标分类号：U416.1+66TM4(TM93)TM71
在线出版日期：2024年3月5日
基金项目：国网浙江省电力有限公司科技资助项目低频电压下含纤维素颗粒变压器油绝缘特性及影响因素[
期刊论文] 电工技术学报--2024, 39(4)刘云鹏 赵家莹 刘贺晨 赵涛 尹子澳低频变压器是低频输电系统中的关键设备,低频电压下的绝缘特性对其设计及运行具有重要意义.该文为了研究低频电压下含纤维素颗粒的变压器油的绝缘特性,分别研究20、30、40、50Hz四种频率交流电压下不同纤维素颗粒度(低、...参考文献和引证文献
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