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1、第44卷第504期電測與儀表Vol.44No.5042007年第12期ElectricalMeasurement&InstrumentationDec.2007基于等效熱路模型的GIS隔離開關(guān)溫升計(jì)算*劉亞男1,舒乃秋1,李彥彰1,黃銳2,耿玉杰2(1.武漢大學(xué)電氣工程學(xué)院,武漢430072;2.國網(wǎng)山東省電力公司,濟(jì)南250002;)摘要:隔離開關(guān)是電力系統(tǒng)中關(guān)鍵的一次設(shè)備。表征設(shè)備負(fù)載能力的溫升,特別是GIS封閉式隔離開關(guān)溫升的計(jì)算在工程上具有重要參考價(jià)值。針對GIS隔離開關(guān)的熱計(jì)算,基于傳熱學(xué)基本原理,建立了220kV三相共箱式SF6隔離開關(guān)
2、等效熱路模型,給出了GIS外殼及導(dǎo)體表面的對流換熱及輻射換熱的計(jì)算公式,提出了針對其在運(yùn)行工況下,考慮環(huán)境溫度、接觸電阻、負(fù)荷電流等因素的穩(wěn)態(tài)熱場計(jì)算方法,計(jì)算結(jié)果與FEM計(jì)算結(jié)果的對比分析表明,所提出的模型能有效、快速計(jì)算GIS隔離開關(guān)正常運(yùn)行條件下的熱點(diǎn)溫升,為電力設(shè)備的動態(tài)增容提供重要參考。關(guān)鍵詞:GIS隔離開關(guān);溫升;等效熱路;動態(tài)增容中圖分類號:TM564文獻(xiàn)標(biāo)識碼:B文章編號:1001-1390(2017)19-0000-00Temperature-risecalculationofGISdisconnectingswitchbased
3、onequivalentthermal-circuitmodelLiuYanan1,ShuNaiqiu1,LiYanzhang1,HuangRui2,GengYujie2(1.SchoolofElectricalEngineering,WuhanUniversity,Wuhan430072,China.2.StateGridShandongElectricPowerCompany,Jinan250002,China.)Abstract::Disconnectingswitchisthekeyprimaryequipmentofinpowersyst
4、em.Temperaturerise,whichindicatestheloadcapacityofpowerequipment,especiallyoftheenclosedGISdisconnectingswitch,itcanbecalculatedtomakeitanimportantreferencevalueinengineering.Thispaperhasbuiltanequivalentthermal-circuitmodeltocalculatethetemperatureriseof220kVthree-phaseenclos
5、edSF6disconnectingswitchbasedonheattransfertheory.ThecalculationformulaofconvectiveandradiativeheattransferbetweenGISconductorandtankhasbeengiven.Thecalculationmethodofsteadythermalfieldunderoperatingconditionsconsideringtheambienttemperature,contactresistanceandloadcurrenthas
6、beenproposed.ThecomparisonbetweenFEMandcalculatedresultsshowsthattheproposedmodelcanbeusedtoacquirethehot-pointtemperature-riseofGISdisconnectingswitchundernormaloperatingconditionsquicklyandeffectively,thusprovidinganimportantreferenceondynamiccapacity-increaseofpowerequipmen
7、t.Keywords::GISdisconnectingswitch,temperaturerise,equivalentthermal-circuit,dynamiccapacityincrease-1-第44卷第504期電測與儀表Vol.44No.5042007年第12期ElectricalMeasurement&InstrumentationDec.20070引言*基金項(xiàng)目:國家863高技術(shù)基金項(xiàng)目(2015AA050204);國家自然科學(xué)基金青年基金項(xiàng)目(51607124);國家電網(wǎng)科技項(xiàng)目(520626150032)隨著氣體絕緣式組合電器
8、(GIS)的推廣應(yīng)用,GIS隔離開關(guān)作為電力系統(tǒng)中重要的一次串聯(lián)設(shè)備,對其負(fù)載能力,尤其是制約隔離開關(guān)增容能力的溫升及熱點(diǎn)