高压直流接地极多场分布特性及影响规律研究任振宇,贾曜诚(东北电力大学,吉林吉林132012)摘要:针对直流接地系统所承受的工作电流过高对接地极的安全运行、人畜安全和地下金属管道设施安全运行构成严重威胁问题,基于等效镜像法与有限元法叠加的方法对复合分层土壤中埋设的环形接地电极周围实际电位进行求解。推导了接地极电流场与温度场之间的交互作用影响;分析了接地极埋深对于地面电位分布及接地特性的影响。结果表明,接地极埋地深度与周围电位和接地电阻阻值成反比,与接地极温升成正比。关键词:高压直流输电;直流接地极;地表电位;电流场;温度场中图分类号:TM721.1文献标志码:A文章编号:1009-5306(2023)01-0031-04StudyonMulti-fieldDistributionCharacteristicsandInfluenceLawofHigh-voltageDirectCurrentGroundingElectrodeRENZhenyu,JIAYaocheng(NortheastElectricPowerUniversity,Jilin132012,China)Abstract:Thehighworkingcurrentofdirectcurrentgroundingsystemposesaseriousthreattothesafeoperationofgroundingelec-trode,humanandanimalsafetyandundergroundmetalpipelinefacilities.Inthispaper,theactualpotentialaroundtheannulargroundingelectrodeburiedinthecompositelayeredsoilissolvedbasedonthesuperpositionmethodofequivalentmirrormethodandfiniteelementmethod.Theinteractioneffectbetweenthecurrentfieldandthetemperaturefieldofthegroundingelectrodeisdeduced,theinfluenceofgroundingelectrodedepthongroundpotentialdistributionandgroundingcharacteristicsisanalyzed.Theresultsshowthattheburieddepthofgroundingelectrodeisinverselyproportionaltothesurroundingpotentialandgroundingre-sistance,andisproportionaltothetemperatureofgroundingelectrode.Keywords:high-voltagedirectcurrenttransmission;directcurrentgroundingelectrode;earthsurfacepotential;currentfield;temperaturefield收稿日期:2022-11-13作者简介:任振宇(1997),男,硕士研究生,研究方向为混合直流输电技术。0引言随着我国高压直流输电技术的不断发展,接地极作为高压直流系统中重要的组成部分,在直流输电系统单极大地运行状态下,起到为直流电流提供返回通路,提高输电系统运行可靠性;在双极对称运行状态下,接地极能够钳制两端中性点电位的作用[1]。当系统出现不平衡运行的情况,接地极周围出现的电磁效应、热电效应以及电化效应等均能...
