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1、第42卷第8期:2563-2570高电压技术Vol.42,No.8:2563-25702016年8月31日HighVoltageEngineeringAugust31,2016DOI:10.13336/j.1003-6520.hve.20160812026多回路电力电缆不同敷设方式对环流的影响1,21222邹宏亮,孙云莲,张弛,汤义勤,蔡也(1.武汉大学电气工程学院,武汉430072;2.国网浙江省电力公司台州供电公司,台州317000)摘要:近年来随着城市建设的不断发展,地下多回路敷设电缆线路越来越多,金属护套环流
2、的损耗问题日趋严重。为此基于电磁感应原理计算三、四回路单芯电缆线路不同敷设方式下护套感应电压,通过建立电缆线路阻抗模型推导环流矩阵方程,获得金属护套环流变化规律。结果表明,多回路系统下,靠近中间的回路环流相对两边要小,回路数增多,环流最大值也增加;随着相间距及接地电阻的增加可以降低环流;分段越不均匀,对环流最大值影响较大且三相环流差别越大;三回路中,并列平行敷设方式下,环流最小的相序组合为ABC-CAB-ABC和ABC-CBA-ACB,品形敷设方式下,环流最小相序为ACB-BAC-ACB、CAB-CBA-CAB;四回
3、路中,并列平行敷设方式下,环流最小的相序组合为ABC-CAB-ABC-CAB,环流最大值约为2A,其他相序组合下环流最大达到5.5A,品形敷设方式下,不论何种相序组合方式的环流均≤2A,环流最小相序为CAB-CBA-CAB-CBA。以上分析结果对电缆线路规划、设计及运维具有较好借鉴意义。关键词:电力电缆;敷设方式;环流;多回路;金属护套;感应电压EffectsofDifferentMulti-loopLayingWaysonCirculatingCurrentofPowerCable1,21222ZOUHonglia
4、ng,SUNYunlian,ZHANGChi,TANGYiqin,CAIYe(1.SchoolofElectricalEngineering,WuhanUniversity,Wuhan430072,China;2.TaizhouPowerSupplyCompany,StateGridZhejiangElectricPowerCompany,Taizhou317000,China)Abstract:Inrecentyears,withthecontinuousdevelopmentofurbanconstruction
5、,moreandmoremulti-loopcablelinesarelaidunderground,sotheproblemofthelossofcirculatingcurrentonmetalsheathisbecomingserious.Onthebasisoftheprincipleofelectromagneticinduction,wecalculatedtheinducedvoltageofmulti-loopsinglecorecables,figuredoutthecirculatingcurre
6、ntmatrixequationbytheimpedancemodel,gotthechangelawofcirculatingcurrentonthemen-talsheath,andfinallygottheresultsofcirculatingcurrentonthemetalsheathofdifferentvoltagecablelinesandtheinterdependentofeachother.Theresultsshowthat,underthemultipleloopsystem,thecir
7、culatingcurrentisrelativelysmallernearthemiddleofthecirculationloopcomparedwiththebothsides,andthecircuitcurrentincreaseswiththenumbersincreasing.Thegrowthofphasespacingandgroundingresistancecanreducethecirculation.Whilethecablesectionismoreuneven,theinfluenceo
8、nthemaximumcirculatingcurrentanddifferencebetweenthree-phasecirculatingcurrentwillbegreater.ThephasesequencecombinationofthesmallestcirculatingcurrentisABC-CAB-ABC,ABC-CBA-A