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1、失。根據(jù)統(tǒng)計(jì)，我國發(fā)生的由于接地系統(tǒng)引起的事故損失每次都在數(shù)百到數(shù)千萬元，由此產(chǎn)生的間接經(jīng)濟(jì)損失則更大。因此保證每一個(gè)變電站的接地網(wǎng)達(dá)到安全指標(biāo)要求尤為重要。本文首先論述了接地系統(tǒng)的國內(nèi)外現(xiàn)狀及接地技術(shù)的發(fā)展方向。其次從變電站接地網(wǎng)的穩(wěn)定性、壽命、經(jīng)濟(jì)三個(gè)方面綜合分析比較，從接地材料的導(dǎo)電性、熱穩(wěn)定性、耐腐蝕性、連接方式等方面，重點(diǎn)分析了熱鍍鋅扁鋼、純銅、鍍銅鋼等接地材料的適用范圍，并通過實(shí)際工程應(yīng)用分析得出不同類型變電站的接地材料選擇結(jié)果；對常見的變電站降阻措施：擴(kuò)大地網(wǎng)面積、引外接地、深井接地、利用自然接地體、使用降阻劑和局部換土等
2、從其本身的降阻機(jī)理上分析，根據(jù)變電站站址所處地區(qū)土壤情況的不同，通過計(jì)算分析各種降阻方案，得出高土壤電阻率變電站降阻方法。關(guān)鍵詞：接地；降阻；方法；材料；地網(wǎng)華北電力大學(xué)碩士學(xué)位論文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
