变电站接地系统降阻方案及接地材料选择

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1、失。根据统计，我国发生的由于接地系统引起的事故损失每次都在数百到数千万元，由此产生的间接经济损失则更大。因此保证每一个变电站的接地网达到安全指标要求尤为重要。本文首先论述了接地系统的国内外现状及接地技术的发展方向。其次从变电站接地网的稳定性、寿命、经济三个方面综合分析比较，从接地材料的导电性、热稳定性、耐腐蚀性、连接方式等方面，重点分析了热镀锌扁钢、纯铜、镀铜钢等接地材料的适用范围，并通过实际工程应用分析得出不同类型变电站的接地材料选择结果；对常见的变电站降阻措施：扩大地网面积、引外接地、深井接地、利用自然接地体、使用降阻剂和局部换土等

2、从其本身的降阻机理上分析，根据变电站站址所处地区土壤情况的不同，通过计算分析各种降阻方案，得出高土壤电阻率变电站降阻方法。关键词：接地；降阻；方法；材料；地网华北电力大学硕士学位论文AbstractWiththeexpansionofpowersystemcapacity，thegroundingshort—circuitcurrentislarger,inordertoguaranteeitssafeandreliableoperation，therequirementsforthegroundingsystemofitssubsta

3、tionaremuchstricter．Recentyearswiththerapidimprovementofequipmentsmanufacturelevelandtherestrictionofsubstationsitebyplanning，moreGasInsulatedSwitchgearsarewidelyapplied．Alltheseinducedthearrangementofsubstationchangedmorecompacterandthefloorspaceareonly25％-40％oftheAirIn

4、sulatedSwitchgearandthesecondarytransformationofgroundingscreenarealsomorecomplex．InvestigationshowsmanygroundingscreencorrosionwereaccruedinChinaduetothegroundingresistancecannotmeetthecorrespondingrequirement．Theseaccidentsnotonlycausedhugeeconomicloss，butalsocausedmor

5、esevereindirecteconomiclosstothewholesociety．Accordingtothestatistic，thelosscausedbythegroundingsystemaccidentscanreachmillionsandeventenmillionseachtime，andtheindirecteconomiclossaremuchheavier．Thereforeitisimportanttoensurethegroundingscreenineverysubstationreachthesaf

6、etyindex．TheresearchstatusinChinaandabroadandthedevelopmentofgroundingtechniqueareintroducedatfirst．Secondly,theapplicationofdifferentgroundingmaterialssuchasgalvanizedfiatsteel，purecopper,copperizedsteelareespeciallyanalyzedfromtheelectricconductivity,thermalstability,a

7、nticorrosionandconnectiontypebythecomprehensiveanalysisandcomparisonofstability,lifeandeconomy．Andthedifferentgroundingmaterialsselectedfordifferentsubstationareacquiredthroughpracticalprojects．Atthesametime，thefamiliarresistancereductionmeasuresforsubstationsuchasenlarg

8、inggroundingscreenarea，groundingtooutside，groundingtoartesianwell，usingnaturalgroundingbody,usingresist