基于暫態(tài)變量的大型變壓器保護.pdf

1、江蘇大學碩士學位論文基于暫態(tài)變量的大型變壓器保護姓名：金鳳羽申請學位級別：碩士專業(yè)：農(nóng)業(yè)電氣化與自動化指導教師：李正明20070601江蘇大學碩士學位論文ABSTRACTLargepowertransformeristhevitalimportantelectricinstallationinelectricsystemWitllthedevelopmentofnationaleconomyrequiredquantityoflarge

2、transformersisgettinglargeWhetherlargetransformeroperatingnormalornothasdirectrelationtoelectricsystem，whichwillworkseries、normalandstabilizeLargepowertransformerisexpensive，anditneedsoperatingwellOncelargetransformerbro

3、ken，itishardtoberepairedwithinlongtimes，whichwillmakebigeconomiclossInrecentyears，thescaleofelectricsystemisgettingup，andthelevelofvoltageisgettinghi曲Theaccidentsoflargetransformerareincreasingwhenmorelargetransformersbr

4、oughtintoactionItdemandshi【ghclaimofrapidityandreliabilityintransformerprotectionThustosearchpreferablelargetransformerprotectionmethodhasmomentoussenseThisdissertationanalysestheelectromagneticpropertyofthelargetransfor

5、merandproposesatransformerprotectionmethodbasedontwotransientvariablesUsingtheincrementoffluxlinkagesbycurrentandvoltage，itcarldistinguishexcitationcurrentfrominternalfaultcurrentTheemulationunderMATLABenvironmentindicat

6、esthatthemethodonidentificationofexcitationcurrentsisreliableTakingDSPastheinsidecore，backstagesoftwarecontrolstheactoftheprotectionequipmentsbythesamplingsignalwhichflowsfromDSPtophotoelectricalinsulationThusthelargetra

7、nsformerprotectionachievesTheresultsoftheexperimentindicatethatthenewmethodcarldistinguishinternalfaultcurrentfrommagneticinrusheffectiveanddependable【KEYWORDS】transformer，magneticinrush，incrementoffluxlinkage，transientv