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1、AGHUniversityofScienceandTechnologyCracowFacultyofElectricalEngineering,Automatics,ComputerScienceandElectronicsDepartmentofElectricalEngineeringandElectricalPowerSaadKhalifaOmarDauModellingofLightningOvervoltagesfortheProtectionofTransmissionLinesbyMeansofShielding
2、WiresandSurgeArrestersPh.D.ThesisUndertheSupervisionof:Dr.hab.eng.JakubFurgałCracow,Poland;20082DEDICATIONIwouldliketodedicatethisthesistomyunderstandingwifeforherencouragement,patience,andsacrificewiththemanyhourstofinishthiswork.Iwouldalsoliketodedicatethisthesist
3、omyfamily.Iappreciatetheirlove,patience,andunderstandingthroughoutthiswork.3AKNOWLEDGEMENTSAlldeepestgratitudeisdueALLAHwhoguidedandaidedmetomakethisworkpossible.IwouldliketoexpressmythankstoProf.dr.hab.eng.RomualdWłodek.I‘mverygratefulforallhishelp.Iwouldliketothan
4、kProf.dr.hab.eng.BarbaraFlorkowska,forhergraciousgiftofthenon-invasivestrainofourwork.IwouldliketoexpressmysinceregratitudefortheinspiringsuggestionsandprecioushelpextendedbyDr.hab.eng.JakubFurgał,whohassupervisedthisthesis.AlsoIamverygratefultotheHeadofFacultyofEle
5、ctricalEngineering,Automatic,ComputerScienceandElectronicsProf.Dr.hab.eng.TomaszSzmucforgivingmethisopportunitytohavethePh.D.degreefromtheFacultyofElectricalEngineering,Automatics,ComputerScienceandElectronicsofAGHUnversityofScienceandTechnology.Iwouldliketothankall
6、theMembersofmyGraduateAdvisoryCommittee,fortheirendlesshelp.Iwouldespeciallyliketothankthemfortheirpatience,suggestions,experience,andexpertisethatmadethisthesispossible.IwouldlikesincerelythankalltheMembersoftheDepartmentofElectricalPower.Theauthoralsogratefullythe
7、acknowledgestheLibyanMinistryofEducationandtotheLibyanEmbassyforthefinancialsupportforthisthesiswhich,wouldnotbepossiblewithoutit.Finally,IwishtoexpressmydeepgratitudetothePolishpeoplefortheirhospitalityandinnumerableactsofkindnessandassistance.4ContentsListofbasics
8、ymbols......................................................................................................6Introduction.................