Neutral Grounding Resistor hauv Transformers: Lub Hom Phiaj, Cov txiaj ntsig, thiab kev siv
Qhov nruab nrab grounding resistor (NGR) yog ib qho tseem ceeb ntawm cov khoom siv hauv cov tshuab hluav taws xob. Nws pab txhawb kev nyab xeeb hluav taws xob thiab tiv thaiv iav thaum muaj teeb meem hauv av.Los ntawm kev txwv qhov txhaum tam sim no uas ntws los ntawm lub tshuab hluav taws xob qhov nruab nrab ntawm qhov chaw mus rau hauv av, NGR txo kev puas tsuaj, txo qis lub sij hawm poob, thiab ua kom tag nrho cov kab ke khiav ntau dua.
Nyem rau daim duab kom paub ntau ntxiv.
Dab tsi yog Neutral Grounding Resistor?
Cias muab, ib tug nruab nrab grounding resistor yog ib tug resistor txuas ntawm lub
nruab nrab point ntawm transformer (los yog generator) thiab lub ntiaj teb av. Nws txoj hauj lwm tseem ceeb yog los tswj tus nqi ntawm cov tam sim no uas ntws thaum muaj kev txhaum hauv av- khaws cia ntawm qhov chaw nyab xeeb, tau txiav txim siab ua ntej.
Yog tias tsis muaj NGR, qhov ua txhaum hauv av tuaj yeem tso tawm cov dej ntws loj heev uas xaus rau lub tshuab hluav taws xob, hloov pauv, cables, thiab lwm yam khoom kim heev. Hauv nruab nrab -voltage thiab industrial setups, cov resistors no feem ntau yog siv los ua ib feem ntawm kev tiv thaiv grounding mus kom ze. Nws yog qhov ntse nruab nrab hauv av: koj tseem tau txais kev kuaj xyuas qhov tsis raug yam tsis tso cov qib txaus ntshai tam sim no khiav qus.
Lub Neutral Grounding Resistor ua haujlwm li cas?
Thaum ib kab - mus rau - av txhaum tshwm sim, qhov nruab nrab grounding resistor nqis mus rau hauv thiab txwv qhov tam sim no ntws los ntawm txoj kev txhaum.
Hloov ntawm ntau txhiab tus amps surging los ntawm lub system, tus resistor tuav nws mus rau qib tswj tau ntau dua.
Qhov kev tswj tam sim no coj qee qhov zoo tiag tiag:
Nws yooj yim rau thermal thiab mechanical stress ntawm transformers
Txo qhov kev pheej hmoo ntawm qhov txaus ntshai arc flashes
Ua kom qhov chaw ua haujlwm muaj kev nyab xeeb rau cov neeg ua haujlwm
Pab tiv thaiv relays sai sai pom thiab cais qhov txhaum
Feem ntau ncua lub neej ntawm koj cov khoom siv hluav taws xob
Kev siv ntawm Neutral Grounding Resistors hauv Transformer Systems
Koj yuav pom nruab nrab grounding resistors nyob rau hauv txhua hom ntawm qhov chaw, suav nrog:
Fais fab faib transformers
Cov nroj tsuag muaj
Kev ua haujlwm mining
Petrochemical chaw
Renewable zog teeb
Kev siv hluav taws xob substations
Cov cheeb tsam no feem ntau xav tau kev tiv thaiv muaj zog yam tsis tau kaw txhua yam ntawm thawj qhov teeb meem.
Hom Kev Pom Zoo Los Ntawm NGR
Txoj kev hauv av yog nyob ntawm seb koj qhov system xav tau dab tsi. Ntawm no yog ib tug ceev ceev:
| Txoj kev hauv av | Fault Current Level | Daim ntawv thov |
|---|---|---|
| Khoom Grounding | Siab heev | Tsawg-voltage distribution systems |
| Tsawg Resistance Grounding | 50–1000 A | Muaj zog tshuab |
| High Resistance Grounding | 5–25 A | Nruam txheej txheem kev lag luam |
| Ungrounded System | Tsawg heev | Cov ntawv thov tshwj xeeb |
Xaiv qhov zoo nruab nrab grounding resistor los mus rau yam xws li transformer voltage, system loj, kev tiv thaiv xav tau, thiab yuav ua li cas cov nroj tsuag ua haujlwm hnub- mus rau - hnub.
Cov txiaj ntsig ntawm Kev Siv Lub Nruab Nrab Grounding Resistor
Muab tso rau hauv qhov nruab nrab grounding resistor muab rau koj qee qhov kev mob hnyav:
Transformer tiv thaiv: Khaws cov kev puas tsuaj hauv av tam sim no hauv kev txheeb xyuas
Tsawg cov khoom puas tsuaj: Txuag switchgear, cables, thiab motors los ntawm wrecked
Kev nyab xeeb zoo dua: Txo lub zog arc flash thiab txo cov teeb meem poob siab
Txhim kho kev ntseeg tau: Ua kom yooj yim nrhiav thiab tshem tawm qhov yuam kev sai
Cov nqi kho mob qis dua: Tsawg dua cov nqi kho loj tom qab muaj teeb meem txhaum cai
Kev xaiv xaiv
Thaum xaiv NGR, cov engineers feem ntau saib:
Qhov system voltage
Muaj txhaum tam sim no
Xav grounding tam sim no theem
Ntev npaum li cas tus resistor xav tau los daws qhov tsis raug (qhov ntsuas lub sijhawm ua txhaum)
Ib puag ncig tej yam kev mob (hauv tsev, sab nraum zoov, plua plav, av, thiab lwm yam)
Cov qauv kev lag luam ntsig txog
Tau txais qhov sizing txoj cai yog qhov tseem ceeb heev - tus resistor yuav tsum muaj kev nyab xeeb ntawm lub tshav kub thaum muaj kev ua txhaum yam tsis muaj kev tiv thaiv.
Xaus
Tag nrho cov nyob rau hauv tag nrho, ib tug nruab nrab grounding resistor plays lub luag hauj lwm tseem ceeb nyob rau hauv ua kom transformer systems muaj kev ruaj ntseg thiab ruaj khov. Los ntawm kev tswj cov av txhaum tam sim no, nws tiv thaiv cov cuab yeej muaj txiaj ntsig thiab pab ua haujlwm kom ua haujlwm zoo. Txawm hais tias koj nyob hauv ib qho chaw lag luam loj, lub chaw siv hluav taws xob, lossis lub chaw tsim hluav taws xob txuas ntxiv, lub qhov dej - xaiv NGR ua rau pom qhov txawv ntawm kev nyab xeeb thiab kev cia siab ntev ntev -.
Raws li cov tshuab hluav taws xob tau txais ntau dua, cov kev daws teeb meem hauv av zoo li no tsuas yog ua qhov tseem ceeb dua.
FAQ
Q: Lub hom phiaj ntawm qhov nruab nrab grounding resistor nyob rau hauv lub transformer yog dab tsi?
A: Ib qho nruab nrab grounding resistor yog siv los txwv cov av txhaum tam sim no thaum muaj kab - rau - av txhaum tshwm sim. Los ntawm kev tswj tus nqi ntawm qhov txhaum tam sim no, nws pab tiv thaiv transformers, switchgear, cables, thiab lwm yam khoom siv hluav taws xob los ntawm kev puas tsuaj thaum txhim kho tag nrho cov kev ruaj ntseg.
Q: Yuav ua li cas yog hais tias ib tug transformer tsis muaj ib tug nruab nrab grounding resistor?
A: Yog tsis muaj qhov nruab nrab grounding resistor, qhov txhaum hauv av yuav ua rau muaj kev txhaum loj heev. Cov tam sim no ntau dhau tuaj yeem ua rau cov cuab yeej puas tsuaj loj, ua rau muaj kev pheej hmoo arc flash, thiab ua rau raug nqi poob qis. Hauv qee lub tshuab, overvoltages kuj tuaj yeem tshwm sim, tsim kev ntxhov siab ntxiv ntawm cov rwb thaiv tsev thiab cov khoom siv hluav taws xob.
Q: Kuv yuav xaiv qhov tseeb nruab nrab grounding resistor rau transformer li cas?
A: Xaiv qhov zoo nruab nrab grounding resistor nyob ntawm ntau yam, nrog rau qhov system voltage, transformer ntsuas, muaj txhaum tam sim no, xav tau grounding tam sim no, thiab lub sijhawm ua txhaum. Cov engineers feem ntau ua ib qho kev kawm hauv av los txiav txim siab qhov zoo tshaj plaws resistor specifications rau daim ntawv thov.
Q: Dab tsi yog qhov txawv ntawm qhov qis - tsis kam grounding thiab siab - tsis kam grounding?
A: Qhov sib txawv tseem ceeb nyob ntawm qhov tsis raug tam sim no tso cai rau ntws. Tsawg-kev tiv thaiv hauv av feem ntau txwv qhov tsis raug tam sim no ntawm 50 thiab 1,000 amps, ua rau nws haum rau ntau lub tshuab ua haujlwm. Siab- kev tiv thaiv hauv av feem ntau txwv tam sim no mus rau 5-25 amps, uas pab tswj kev ua haujlwm ntawm lub cev thaum muaj kev txhaum hauv av thaum txo cov khoom puas tsuaj. Ob txoj kev siv lub nruab nrab grounding resistor, tab sis tus nqi resistor yog tsim los rau cov hom phiaj tiv thaiv sib txawv.
