Lub Nruab Nrab Grounding Resistor (NGR) yog ib qho tseem ceeb hauv cov tshuab hluav taws xob hluav taws xob, tshwj xeeb tshaj yog nyob rau hauv cov phiaj xwm transformer, uas nws pab txhim kho kev nyab xeeb thiab kev ntseeg tau. Lub NGR txwv qhov loj ntawm qhov txhaum tam sim no nyob rau hauv cov ntaub ntawv ntawm av txhaum, yog li tiv thaiv lub transformer thiab cov khoom txuam. Kev nkag siab txog kev ua haujlwm ntawm NGR yog qhov tseem ceeb rau kev lag luam uas tso siab rau cov khoom siv hluav taws xob rau lawv cov khoom siv hluav taws xob.
Lub luag haujlwm tseem ceeb ntawm NGR hauv Transformer Systems:
1.Limiting Fault Current
Hauv cov tshuab hluav taws xob, kev ua txhaum hauv av (short circuits to ground) yog cov feem ntau ua txhaum. Yog tias tsis muaj av, qhov txhaum hauv av tuaj yeem ua rau muaj kev puas tsuaj loj heev, ua rau muaj kev puas tsuaj rau cov cuab yeej thiab tsim kev phom sij rau cov neeg ua haujlwm.
Lub NGR txuas nrog nruab nrab ntawm qhov nruab nrab ntawm lub transformer thiab lub ntiaj teb. Nws lub luag haujlwm tseem ceeb yog txwv qhov tam sim no uas ntws los ntawm lub kaw lus thaum lub sijhawm ua txhaum hauv av mus rau qib kev nyab xeeb thiab tswj tau. Piv txwv li, yog tias muaj ib qho kev ua txhaum ntawm txoj kab-rau-hauv av, NGR txwv cov dej ntws tam sim no, tiv thaiv ob qho tib si transformer thiab downstream Cheebtsam.
2. Tiv thaiv cov khoom puas tsuaj
Kev tswj tsis tau tam sim no tuaj yeem ua rau overheating, rwb thaiv tsev tawg, thiab txawm tias muaj kev puas tsuaj loj ntawm transformers thiab lwm yam khoom siv hluav taws xob. Los ntawm kev tswj xyuas qhov txhaum tam sim no, NGR txo qhov kev ntxhov siab ntawm lub cev, tiv thaiv cov khoom puas.
Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog nyob rau hauv nruab nrab mus rau high-voltage systems uas transformers yog ib qho tseem ceeb rau kev faib hluav taws xob zoo. NGR tiv thaiv kev kub siab tam sim no los ntawm kev puas tsuaj rau sab hauv ntawm cov khoom siv hluav taws xob, yog li ncua lub neej ntawm cov khoom siv.
3. Txhim khu kev ruaj ntseg thiab kev nyab xeeb
Grounding systems nrog NGRs txhim kho kev ruaj ntseg los ntawm kev tiv thaiv kev hloov pauv loj hauv av thaum muaj teeb meem hauv av. Qhov no ua kom ntseeg tau tias qhov tsis muaj kev cuam tshuam ntawm qhov system tuaj yeem ua haujlwm txuas ntxiv, yog li txo qis qis qis.
Tsis tas li ntawd, kev txwv qhov txhaum tam sim no rau tus nqi uas tau teev tseg ua ntej yuav txhim kho cov neeg ua haujlwm nyab xeeb. Cov hluav taws xob qis qis txo qhov kev pheej hmoo ntawm hluav taws xob poob siab thiab txo cov hluav taws kub nyhiab uas tuaj yeem tshwm sim los ntawm kev ua haujlwm siab hauv av.
4.Txhim kho qhov yuam kev thiab kev saib xyuas
Los ntawm kev tswj cov av txhaum tam sim no, NGRs ua kom pom qhov yuam kev yooj yim dua. Qhov tam sim no dhau los ntawm tus resistor tuaj yeem ntsuas, ua rau lub tswb lossis tiv thaiv relays ceeb toom rau cov neeg ua haujlwm ntawm qhov txhaum. Qhov no pab hauv kev txheeb xyuas thiab txheeb xyuas cov teeb meem sai sai, ua kom muaj kev kho sai sai thiab txo qis tag nrho lub sijhawm.
Nws kuj tseem pab cov khoom siv hluav taws xob thiab kev lag luam txo qis kev cuam tshuam kev ua haujlwm, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem tseem ceeb xws li cov chaw tsim hluav taws xob, cov phiaj xwm hluav taws xob tauj dua tshiab, thiab cov chaw tsim khoom lag luam.
5.Ua raws li Cov Cai Hluav Taws Xob thiab Cov Qauv
Ntau qhov chaw tsim khoom thiab cov khoom siv hluav taws xob yuav tsum ua raws li cov cai nruj hluav taws xob thiab cov cai tswj kev nyab xeeb, uas tswj hwm kev siv cov av hauv av zoo li NGRs los tiv thaiv cov khoom puas tsuaj thiab ua kom cov neeg ua haujlwm nyab xeeb.
NGRs pab cov chaw ua tau raws li cov qauv kev cai no los ntawm kev ua kom ntseeg tau tias cov dej ntws tsis raug nyob rau hauv qhov chaw nyab xeeb.
Hom NGRs thiab lawv daim ntawv thov
NGRs tuaj nyob rau hauv ntau yam configurations nyob ntawm qhov voltage thiab tam sim no theem yuav tsum tau. Piv txwv li, tus nqi kuj tuaj yeem hloov kho kom ntseeg tau tias qhov txhaum tam sim no raug txwv rau tus nqi tshwj xeeb, feem ntau nyob rau hauv thaj tsam ntawm 10 txog 1,000 amperes. Qhov no ua rau lawv muaj feem xyuam rau ntau yam ntawm transformer systems:
●High-voltage transformers hauv substations tau txais txiaj ntsig los ntawm NGRs vim tias lawv txwv qhov cuam tshuam loj, tiv thaiv kev puas tsuaj rau lub zog loj transformers.
● Nruab nrab-voltage transformers nyob rau hauv industrial cov nroj tsuag siv NGRs los tiv thaiv cov txheej txheem ntau lawm los ntawm kev npaj txhij txog fais fab cuam tshuam vim av txhaum.
Xaus
Lub Neutral Grounding Resistor yog ib qho cuab yeej tseem ceeb hauv cov phiaj xwm transformer, muab kev tiv thaiv thiab kev ruaj ntseg rau cov tshuab hluav taws xob. Los ntawm kev txwv qhov txhaum tam sim no, tiv thaiv cov cuab yeej puas tsuaj, thiab txhim kho kev nyab xeeb, NGR yog qhov tseem ceeb rau kev lag luam uas vam khom rau cov khoom siv hluav taws xob rau lawv cov hluav taws xob faib. Nws siv dav thoob plaws ntau yam kev siv, suav nrog cov nroj tsuag kev lag luam, cov khoom siv hluav taws xob, thiab cov phiaj xwm hluav taws xob tauj dua tshiab, qhia txog nws qhov tseem ceeb hauv kev tsim hluav taws xob niaj hnub no.
Post lub sij hawm: Oct-10-2024