Muaj ntau yam txawv txav uas tuaj yeem ua rau muaj kev puas tsuaj rau lub tshuab hluav taws xob.Qee yam ntawm cov xwm txheej no yog tshwm sim los ntawm kev ua tsis tiav hauv lub tshuab hluav taws xob lossis ib qho ntawm nws cov subsystems thiab lwm tus los ntawm lub zog hluav taws xob nws tus kheej.Cov lus hauv qab no qhia txog cov hom kev ua tsis tiav uas tuaj yeem tshwm sim thiab cov txheej txheem tiv thaiv cuam tshuam.
Stator Ground Faults
Qhov feem ntau tshwm sim tsis ua hauj lwm ntawm stator winding yog qhov tawg ntawm cov rwb thaiv tsev ntawm ib theem thiab hauv av.Undetected, qhov txhaum no tuaj yeem ua rau lub tshuab hluav taws xob puas sai sai.Hluav taws kub kuj tseem ua tau ntawm cov tshuab cua txias.Lub peev xwm ntawm lub stator sib txawv ntawm lub hauv paus txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhavYog li ntawd, kev tiv thaiv kev ua txhaum hauv av feem ntau xav tau rau stator.
Generators muab lub zog siv los ntawm tag nrho cov loads nyob rau hauv lub hwj chim system thiab ntau lub reactive zog xav tau los muab cov inductive ntsiab yog li tswj lub system voltage ntawm nominal nqi.Cov tshuab hluav taws xob muaj peev xwm me me rau lub zog cia.Yog li ntawd, lub cim ploj yuav tsum tau hloov tam sim ntawd lossis qhov sib npaug ntawm cov khoom thauj yuav tsum tau muab tso tseg.Nws yog ib qho tseem ceeb uas qhov kev tiv thaiv rau lub tshuab hluav taws xob muaj kev nyab xeeb heev thaum muaj kev cuam tshuam sab nraud.
Lub tshuab hluav taws xob yog ib qho ntawm cov txheej txheem nyuaj uas suav nrog lub tshuab hluav taws xob, ib qho exciter, thiab ntau yam kev pabcuam.Ntxiv nrog rau kev tshawb pom ntawm luv luv Circuit Court, lub tshuab hluav taws xob tiv thaiv IED yog li yuav tsum tau kuaj xyuas cov xwm txheej txawv txav uas tuaj yeem ua rau lub tshuab hluav taws xob puas lossis ib qho ntawm nws cov subsystems.Generators tuaj yeem muab faib ua ob hom loj: induction thiab synchronous.Cov tshuab induction feem ntau yog me me, xws li tsawg li ib puas kVA, thiab feem ntau yog tsav los ntawm lub tshuab reciprocating.Cov tshuab synchronous muaj qhov loj ntawm ntau pua kVA txog 1200 MVA.
Lub tshuab hluav taws xob synchronous tuaj yeem tsav los ntawm ntau yam kev hloov pauv tseem ceeb, suav nrog cov tshuab hluav taws xob reciprocating, hydro turbines, combustion turbines, thiab cov chav turbines loj.Hom turbine cuam tshuam rau kev tsim ntawm lub tshuab hluav taws xob thiab tuaj yeem yog li cuam tshuam rau kev tiv thaiv.Lub tshuab hluav taws xob loj thiab nws txoj hauv kev hauv av kuj cuam tshuam rau nws txoj kev tiv thaiv.Cov tshuab me me thiab nruab nrab feem ntau txuas ncaj qha mus rau lub network faib khoom (kev sib txuas ncaj qha).Hauv qhov kev teeb tsa no ob peb lub tshuab tuaj yeem txuas nrog tib lub npav.Cov tshuab loj feem ntau yog txuas nrog lub zog hloov hluav taws xob rau kev sib txuas lus (chaw txuas nrog).
Ib lub zog thib ob ntawm lub tshuab hluav taws xob terminals muab lub zog pabcuam rau lub tsev.Generators yog grounded nyob rau hauv thiaj li yuav tswj los ntawm puas voltage transients thiab pab txhawb kev khiav hauj lwm ntawm kev tiv thaiv functions.Direct-connected generators feem ntau grounded los ntawm ib tug tsawg impedance uas txwv cov av txhaum tam sim no rau 200-400 amps.Chav tsev txuas nrog cov tshuab feem ntau yog hauv av los ntawm qhov siab impedance uas txwv qhov tam sim no tsawg dua 20 amps.
Rau kev sib txuas ncaj qha, tsis tshua muaj impedance grounded tshuab, siv txoj kev tshawb nrhiav tam sim no.Qhov kev tiv thaiv no yuav tsum ceev ceev thiab rhiab heev rau kev ua txhaum hauv av thaum tib lub sijhawm ruaj ntseg thaum muaj kev cuam tshuam sab nraud.Qhov no tuaj yeem ua tiav siv qhov txwv hauv av tsis raug lossis lub ntsiab lus nruab nrab.Cov kev txwv hauv av txwv tsis pub siv nyob rau hauv G30 thiab G60 ntiav cov symmetrical tivthaiv tivthaiv mechanism uas muab kev ruaj ntseg siab thaum lub sij hawm sab nraud faults nrog CT saturation tseem ceeb.
Rau chav tsev txuas nrog, siab impedance grounded machines, voltage-raws li txoj kev feem ntau yog siv los muab kev ua txhaum hauv av.Siv kev sib xyaw ua ke ntawm cov ntsiab lus tseem ceeb thiab qhov thib peb sib haum xeeb, kev tiv thaiv hauv av rau 100% ntawm stator winding tuaj yeem ua tiav.GE relays ntiav tus thib peb harmonic voltage caij uas teb rau qhov piv ntawm qhov nruab nrab thiab davhlau ya nyob twg qhov tseem ceeb ntawm qhov thib peb harmonic.Cov ntsiab lus no yooj yim rau kev teeb tsa thiab tsis hnov tsw rau kev hloov pauv hauv qib thib peb harmonic hauv kev ua haujlwm ib txwm muaj.
Stator Phase Faults
Phase faults tsis cuam tshuam hauv av tuaj yeem tshwm sim ntawm qhov kawg winding lossis hauv ib lub qhov rau hauv cov tshuab uas muaj cov coils ntawm tib theem hauv tib lub qhov.Txawm hais tias qhov kev ua txhaum theem tsawg dua li qhov txhaum hauv av, qhov tam sim no tshwm sim los ntawm qhov txhaum no tsis txwv los ntawm grounding impedance.Raws li xws li nws yog ib qho tseem ceeb uas cov faults no yuav tsum tau kuaj kom sai li sai tau kom txo tau qhov kev puas tsuaj rau lub tshuab.Txij li thaum lub kaw lus XOR piv yog qhov tshwj xeeb siab ntawm lub tshuab hluav taws xob, lub stator sib txawv ntawm lub cev tshwj xeeb yog raug rau CT saturation vim yog DC tivthaiv tam sim no thaum muaj kev cuam tshuam sab nraud.G60 stator sib txawv algorithm ntxiv kev ruaj ntseg ntxiv nyob rau hauv hom kev taw qhia kev txheeb xyuas thaum CT saturation yog xav tias vim yog AC lossis DC cov khoom ntawm tam sim no.
Post lub sij hawm: Jan-30-2023