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1、电工技师论文()Inmanyyearsofequipmentoverhaul,itisnotedthatmanyfaultsarecausedbythelongtimeuseofvariouslowvoltageelectricalappliances,theagingoftheircomponentsandthelackofregularmaintenanee.Thefollowingthroughmyworkinthemaintenanceofsomeexamplestoexplainlow—voltageel
2、ectricalequipmenttroubleshootingandessentials.Examplesofbreakdownofseveralcommonvoltageandelectricalequipment1、voltagebreakerfaultWhenthecontactisoverheated,thedistributioncontrolcabinetcansmellthesmel1.Afterchecking,themovingcontactisnotcompletelyinsertedinto
3、thestaticcontact,andthecontactpressureisnotenough,whichleadstothedecreaseoftheswitchingcapacityandtheoverheatingofthecontact・Atthispoint,theoperatingmechanismshallbeadjustedsothatthemovingcontactiscompletelyinsertedintothestationarycontact.ElectricarcflashBaox
4、iang,afterexaminationislong-termloadoverweight,poorcontactcausedbyloosecontact.Repairthisfault,mustpayattentiontosafety,topreventthearcofpeopleandequipmenthazards・Aftercheckingtheloadandcontact,theloadisnotloadedbeforethenormalloadcanbecarriedouttochecktheoper
5、ationuntilnorma1.Thisfaultmustpayattentiontothedailymaintenanceworkoftheequipment,soasnottocauseunnecessaryharm.2、contactorfaultBecauseofthebadcontactofacontactortheloosenessofthescrewontheterminal,themotorisrunningoutofphase・Atthispoint,themotorcanturn,butitm
6、akesabuzzingnoise・Parkingshouldbecheckedimmediately.Contactfusionwelding,the"stop"button,themotordoesnotstop,andmaybebuzzing・Thiskindoffaultiscausedbyweldingoftwophaseorthree-phasecontactcausedbyoverloadcurrent・Itshouldbeswitchedoffimmediately,andthecontactorw
7、illbereplacedaftercheckingload・Theenergizedarmaturedoesnotpullin.Ifthereisnovibrationandnoisewhenthepowerischecked,itisindicatedthatthepartofthearmaturemovementisstuckalong,butthefaultofthecoilisbroken.Removethecoilanddrythepaintafterwindingagainaccordingtothe
8、originaldata.1、thermalrelayfaultMechanicalequivalentofheatelementburnedoff,ifthemotordoesnotstartorstartabuzz,maybethefuseelementheatthermalrelayinburn.Thereasonforthisfaultisthatt
