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1、neutraldoesnotinsurethattheinsulationbackfromtheneutralSUGGESTIONSFORLIGHTNINGP.ROTECTIVEwillnotbeoverstressedforinthetestsapproximately2/3ofthemag-EQUIPMFNTFORA-CROTATINGMACHINESnitudeoftheenteringwavewasmeasuredatapointonly1/3fromthesolidlygroundedn
2、eutral.Thesetestsindicatedthatbothar-..t.restersandcapacitorsatthemachineterminalswouldbeneededtoGeneralrulesgovernngtheselectonoflightningprotecttheinsulationtoground.protectiveequipmentaregivenintableII.3.Furthermore,thedataonsurgeimpedancesofarmatu
3、rewindingsindicatethatthisimpedancevariesdirectlywiththenumberofturnsREFERENCESpercoil.Atransientinpassingfromalowertoahighersurgeim-pedancereflectspositivelyandconsequentlythewindingofthe1.VOLTAGEOSCILLATIONSINARMATUREWINDINGSUNDERLIGHTNINGIM-machine
4、withgradedinsulationshouldhavethehighernumberofPULSES-I,E.W.Boehne.A.I.E.E.TRANS.,V.49,1930,p.1587-615.turnspercoilinthehigherinsulatedsectionssothatwhenthesurge2.EFFECTOFLIGHTNINGVOLTAGESONROTATINGMACHINESANDMETHODpassesfromahighertoalowerinsulatedse
5、ctiontherewillbeacorre-OFPROTECTINGAGAINSTTHEM,F.D.FielderandE.Beck.A.I.E.E.TRANS.,spondingdecreaseratherthanariseinthetransientvoltage.v.49,1930,p.1577-86.-3.EFFECTOFTRANSIENTVOLTAGESONPOWERTRANSFORMERDESIGN-IV,SURGEIMPEDANCEK.K.PalueffandJ.H.Hagengu
6、th.A.I.E.E.TRANS.,V.51,1932,p.601-15.4.PROTECTIONOFROTATINGA-CMACHINESAGAINSTTRAVELINGWAVEVOLTAGESDUETOLIGHTNING,W.J.Rudge,Jr.,R.W.Wieseman,andW.W.1.ThesurgeimpedanceofamachinearmaturewindingvariesLewis.A.I.E.E.TRANS.,V.52,1933,p.434-65.directlywithth
7、enumberofturnspercoil,increasessomewhatasthe5.SURGEPROTECTIONFORROTATINGMACHINES,J.F.Calvert,A.C.Mon-voltageratingincreasesandmaybeeitherincreasedordecreasedtieth,andE.Beck.Elec.Ji.,v.30,1933,p.91.byanincreaseinthekilovoltampererating.6.PROTECTINGMACH
8、INESFROMLINESURGES,J.F.Calvert.ELEC.ENGG.(A.I.E.E.TRANS.),V.53,1934,p.139-46.2.Thesurgeimpedanceperphaseisapproximatelythesurge7.TRANSIENTVOLTAGESINROTATINGMACHINES,E.M.Hunter.ELEC.impedancepercircuitdividedbythenumberofcircuits.ENGG.(A.I.E.E.
