H0 kev twb kev txuas nyob rau hauv peb-theem tis transformer yog ib qho tseem ceeb nam ntawm lub transformer tus tsim, tshwj xeeb tshaj yog nyob rau hauv cov ntsiab lus ntawm grounding thiab system stability. Qhov kev sib txuas no yog hais txog qhov nruab nrab lossis hauv av ntawm qhov siab-voltage (HV) winding nyob rau hauv lub transformer, feem ntau denoted li H0. Kev tuav kom raug thiab kev sib txuas ntawm H0 yog qhov tseem ceeb rau kev ua kom muaj kev nyab xeeb thiab ua haujlwm tau zoo ntawm cov khoom siv hluav taws xob.
H0 yog dab tsi hauv peb-theem Transformer?
H0 sawv cev rau qhov nruab nrab ntawm qhov siab-voltage winding nyob rau hauv peb-theem transformer. Nws yog lub ntsiab lus uas lub winding lub theem sib tshuam nyob rau hauv ib tug wye (hnub qub) configuration, tsim ib qho nruab nrab point. Qhov nruab nrab taw tes no tuaj yeem siv rau hauv av, muab qhov taw qhia ruaj khov rau lub kaw lus thiab txhim kho kev nyab xeeb hluav taws xob tag nrho.
Qhov tseem ceeb ntawm H0 Grounding
Grounding H0 point ua haujlwm rau ntau lub hom phiaj tseem ceeb:
1.Kev ruaj ntseg thiab kev nyab xeeb: Los ntawm grounding H0, lub kaw lus muaj qhov taw qhia ruaj khov, uas pab tswj kev ruaj ntseg hluav taws xob thoob plaws txhua theem. Qhov kev sib txuas no txo qhov kev pheej hmoo ntawm overvoltage tej yam kev mob, uas tuaj yeem tshwm sim vim qhov tsis sib npaug ntawm cov loads lossis lwm yam tsis raug.
2.Kev tiv thaiv txhaum: Grounding H0 point tso cai rau cov dej ntws mus rau hauv av, ua rau cov khoom siv tiv thaiv zoo li cov hluav taws xob hluav taws xob thiab cov khoom siv hluav taws xob txhawm rau txheeb xyuas thiab cais qhov tsis raug sai. Qhov no yuav pab txo qis kev puas tsuaj rau lub transformer thiab cov khoom sib txuas, ua kom muaj kev ruaj ntseg txuas ntxiv mus.
3.Harmonic Mitigation: Tsim nyog H0 grounding pab txo cov kev cuam tshuam ntawm harmonics nyob rau hauv lub system, tshwj xeeb tshaj yog lub zero-sequence harmonics uas yuav circulate nyob rau hauv nruab nrab. Qhov no yog qhov tseem ceeb tshwj xeeb hauv cov tshuab uas siv cov khoom siv hluav taws xob nkag siab zoo, vim tias kev sib haum xeeb tuaj yeem ua rau muaj kev cuam tshuam thiab txo cov khoom siv lub neej.
4.Txo ntawm Transient Overvoltages: Grounding lub H0 taw tes kuj tuaj yeem pab txo qis cov overvoltages tshwm sim los ntawm kev hloov cov haujlwm lossis hluav taws xob tawm tsam, yog li tiv thaiv lub transformer thiab cov khoom sib txuas.
Hom H0 Grounding
Muaj ntau ntau txoj hauv kev rau grounding H0 taw tes, txhua tus nrog nws daim ntawv thov tshwj xeeb:
1.Khoom Grounding: Txoj kev no suav nrog kev txuas H0 ncaj qha rau hauv av yam tsis muaj kev cuam tshuam impedance. Nws yog qhov yooj yim thiab siv tau rau cov tshuab hluav taws xob qis thiab nruab nrab-voltage qhov twg cov dej tsis raug tam sim no tswj tau.
2.Resistor Grounding: Nyob rau hauv txoj kev no, H0 txuas nrog hauv av los ntawm ib qho resistor. Qhov no txwv qhov txhaum tam sim no mus rau theem kev nyab xeeb, txo qhov kev ntxhov siab ntawm lub transformer thiab lwm yam khoom siv thaum lub sij hawm hauv av faults. Nws yog feem ntau siv nyob rau hauv nruab nrab-voltage systems.
3.Reactor Grounding: Ntawm no, lub reactor (inductor) yog siv ntawm H0 thiab hauv av. Txoj kev no muab cov impedance siab los txwv qhov txhaum tam sim no thiab feem ntau yog ua haujlwm nyob rau hauv high-voltage systems uas txhaum tam sim no loj npaum li cas yuav tsum tau tswj.
4.Ungrounded los yog ntab: Hauv qee qhov tshwj xeeb, H0 taw tes tsis yog hauv qab txhua. Qhov kev teeb tsa no tsis tshua muaj tshwm sim thiab feem ntau siv rau cov ntawv thov kev lag luam tshwj xeeb uas yuav tsum tau cais tawm hauv av.
Qhov Zoo Tshaj Plaws rau H0 Grounding
Txhawm rau kom ntseeg tau tias qhov kev ua tau zoo ntawm peb-theem faib transformer, ntau qhov kev coj ua zoo tshaj plaws yuav tsum tau ua raws li H0 grounding:
1.Tsim nyog thiab installation: Kev tsim ntawm H0 grounding system yuav tsum ua raws li cov kev cai tshwj xeeb ntawm daim ntawv thov, suav nrog cov xwm txheej xws li cov theem tam sim no, qhov system voltage, thiab ib puag ncig.
2.Tsis tu ncua kuaj thiab tu: Grounding systems yuav tsum tau kuaj xyuas tsis tu ncua thiab kuaj xyuas kom ntseeg tau tias lawv tswj tau txoj hauv kev uas tsis muaj impedance rau hauv av. Sij hawm dhau mus, kev sib txuas tuaj yeem ua rau corroded los yog xoob, txo lawv cov txiaj ntsig.
3.Ua raws li Cov Qauv: Cov kev coj ua hauv av yuav tsum ua raws li cov qauv kev lag luam thiab cov kev cai, xws li cov teeb tsa los ntawm IEEE, IEC, lossis cov lej hluav taws xob hauv zos.
Xaus
H0 kev twb kev txuas nyob rau hauv peb-theem tis transformer yog ib qho tseem ceeb tivthaiv uas plays lub luag hauj lwm tseem ceeb hauv av thiab tag nrho stability ntawm lub hwj chim faib system. Kev ua kom zoo hauv av H0 tsis tsuas yog txhim kho kev nyab xeeb thiab tiv thaiv kev ua txhaum, tab sis kuj tseem ua rau muaj txiaj ntsig zoo ntawm kev sib txuas hluav taws xob.
Lub sij hawm xa tuaj: Sep-18-2024