简介：Inviewofthelimitationsinthepredictionofpollutionflashovervoltagebyleastsquaresregression,amethodtopredictpollutionflashovervoltagebyrobustregressionisproposed.Accordingtotestingvoltageandthedataofsaltdepositdensity(ρSDD)andnon-solubledepositdensity(ρNSDD),theregressioncoefficientissolvedbyacomplexweightingleastsquareiterationalgorithm.Initerativecalculations,theweightfunctionisadopted,inwhichtheweightcoefficientisthefunctionoftheresidualerroroflastiterationtoweakentheinfluenceofsingularvaluesontheregressioncoefficient.ThecharacteristicexponentdenotingρSDDinfluenceandcharacteristicexponentdenotingρNSDDinfluencearemappedbytheregressioncoefficient,andthusthepollutionflashovervoltageofinsulatorscanbepredicted.Throughthecomparisonoftestresults,robustregressionresultsandleastsquaresregressionresults,theeffectivenessoftheproposedrobustregression-basedforecastingmethodisverified.

简介：Atriggerdeviceandatriggeredpseudosparkswitch(TPSS)weredesignedbasedonsurfaceflashovertechnology,inordertomeettherequirementsfrompresentpulsepowertechnol-ogyandpulsecurrenttesttechnologysuchasalonglifetime,reliabilityinawidevoltagerange,ashortdelaytime,aswellassmalldelayjitters.Thetriggerdevicesweremadefromdifferentdielectricmaterials,withtheirpermittivitiesfromtenstothousands.ThetriggercharacteristicsofTPSSwereinvestigated.Theresultsindicatethatthehigh-dielectrictriggerdeviceshowsbetterperformanceandhigheremittedchargeoftheelectronemissionwithinalladjustedparametersincludingthegaspressureandappliedvoltage.Forthedielectricmaterialwithrelativepermittiv-ityε_rof3460,whenthegaspressureis7Pa,thehold-offvoltageofTPSSis28kV,theminimumtriggerswitchvoltagedropsto128V,theminimumdischargingdelaytimeanddelayjitterarelessthan35nsand6ns,respectively,andthereliableoperationcanbereachedwithinaverylargerangeofchargingvoltage,between0.46%and99%ofitsself-breakdownvoltage.

简介：DuringtwoyearsoddperiodfromDec.1987toFeb.1990,therehadbeenrepeatedlypollution-flashoverfailuresonour500kVtransmissionlines,resultinginawidescopeblackout.Therewereeleven500kVlinesaltogetherinNorth-east,EastandNorthChinapowergrids,wherepollution-flashoverfailureshappenedoneafteranotheron36transmissionlinetowers(poles).Since500kVtransmissionlinesarethemaintrunksofhighvoltage