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时间:2020-06-03
《运行变电站接地网接地阻抗计算分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、高电压技术第39卷第2期2013年2月28日HighVoltageEngineering,Vo1.39,No.2,February28,2013457运行变电站接地网接地阻抗计算分析张义,黄松波,王建国,章涛,洪海成,田呈环(1.武汉大学电气工程学院,武汉430072;2.广东电网公司佛山供电局,佛山528000)摘要:变电站接地网的拓扑结构由于输电线路架空地线或两端接地电缆的接入会发生改变,测量得到的接地阻抗已不是运行变电站主接地网的接地阻抗。为此基于场路结合的思想,提出了分步计算运行变电站接地网接地阻抗的方法。通过算例分析比较,验
2、证了该计算方法的准确性和计算模型的正确性。对影响计算的主要因素进行分析表明:电流注入点和架空地线出线回数有较大影响。对比了3种不同条件下架空地线及杆塔对计算精度的影响,提出测量运行变电站接地网接地阻抗时,电流注入点不宜选在地网边角;架空地线回数较多时,需考虑终端塔对测量结果的影响。关键词:变电站;接地网;接地阻抗;架空地线;杆塔;场路结合DOI:10.3969/j.issn.1003—6520.2013.02.029文章编号:1003—6520(2013)02—0457-07AnalysisofGroundingImpedanceCo
3、mputationforGroundingGridofSubstationinOperationZHANGYi,HUANGSongbo,WANGJianguo,ZHANGTao。,HONGHaicheng2,TIANChenghuan(1.SchoolofElectricalEngineering,WuhanUniversity,Wuhan430072,China;2.FoshanPowerSupplyBureau,GuangdongPowerGridCompany,Foshan528000,China)Abstract:Topolo
4、gystructureofagroundinggridinsubstationwillchangeduetOtheoverheadgroundingwireoftransmissionlinesortwo—endgroundedpowercablesconnectedwiththegroundinggrid.Consequently,themeasuredgroundingimpedanceof3gridwillbedifferentfromtheactualvalueofthemaingroundinggridofsubstatio
5、ninoperation.Therefore。onthebasisoftheideaoffield—circuitcouplingtheory,weputforwardastep—by-stepmethodtOcalculatethegroundingimpedanceofsubstationinoperation.Theaccuracyofthecalculationmethodandthecorrectnessofthemodelwerevalidatedbyanexampleanalysisandcomparison.Anana
6、lysisofthemainfactorsaffectingthecalculationshowsthatthecurrentinjectionpointandtheamountofoverheadgroundingwireshaveconsiderableinfluencesonthegroundingimpedancecalculation.Moreover。theimpactofgroundingwireandtoweronthecalculationaccuracyunderthreedifferentconditionsar
7、ecompared,andtheresultsindicatethatthecurrentinjectionpointshouldnotbeinthecornersofagroundinggridwhenmeasuringthegroundingimpedanceofsubstationinoperation;iftherearemanylightninglines,itisnecessarytOconsidertheimpactoftheterminaltoweronthemeasurementresults.Keywords:su
8、bstation;groundinggrid;groundingimpedance;groundwire;tower;field—circuitcoupling难以满足运行要求,基建时往往采用深井和降阻剂0引言等措施作为
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