经电阻接地系统风电场接地变压器保护的整定曲文浩,秦海停(深能南京能源控股有限公司,江苏南京210000)摘要:近年来随着风电容量占比的不断增大,风电场的可靠运行越来越重要。较常规输电线路而言,风电场地形复杂,汇集系统所处环境恶劣,短路故障时有发生,其中单相接地故障占比最高。而区别于传统35kV系统采用的不接地方式,风电场汇集系统多采用中性点经电阻或消弧线圈接地的方式,以便快速切除单相故障。基于此,介绍了风电场汇集系统接地方式和经电阻接地系统方式,阐述了风电场接地变压器保护整定案例,并对接地变压器整定要点进行分析。关键词:风电场;单相故障;低电阻接地系统;接地变压器保护中图分类号:TM862DOI:10.19768/j.cnki.dgjs.2023.02.047SettingofGroundingTransformerProtectioninWindFarmResistanceGroundingSystemQUWenhao,QINHaiting(ShenzhenEnergyNanjingEnergyHoldingCo.,Ltd.,Nanjing210000,China)Abstract:Withtheincreasingproportionofwindpowercapacityinrecentyears,thereliableoperationofwindfarmsisbecomingmoreandmoreimportant.Comparedwithconventionaltransmissionlines,duetothecomplexterrainofthewindfarmandtheharshenvironmentofthecollectionsystem,shortcircuitfaultsoccurfrequently,amongwhichsingle-phasegroundingfaultaccountsforthehighestproportion.Differentfromtheungroundedmodeadoptedbythetraditional35kVsystem,thewindfarmcollectionsystemmostlyadoptstheneutralpointgroundingthroughresistanceorarcsup-pressioncoil,soastoquicklyremovesingle-phasefaults.Basedonthis,thegroundingmodesofwindfarmcollectionsys-temandresistancegroundingsystemareintroduced.Theprotectionsettingcaseofwindfarmgroundingtransformerisde-scribed,andthekeypointsofgroundingtransformersettingareanalyzed.Keywords:windfarms;single-phasefaults;lowresistancegroundingsystem;groundingprotection收稿日期:2022-05-28作者简介:曲文浩(1987-),研究方向为电力系统及其自动化;秦海停(1994-),研究方向为电气工程及其自动化。1风电场汇集系统接地方式受地形条件及运行维护成本的影响,风电场汇集线路往往采用电缆代替架空线,电缆越长,其对地电容越大,不接地系统单相故障时,电弧的间歇性熄灭与重燃容易引起弧光接地过电压,对设备绝缘造成击穿。持续的电弧造成周围空气绝缘降低,单相故障易发展成相间故障,产生谐...
