Neutral grounding resistors (NGRs) ua lub luag haujlwm tseem ceeb hauv cov tshuab hluav taws xob, tshwj xeeb hauv kev txhim kho kev nyab xeeb thiab kev ntseeg siab thaum lub sijhawm ua txhaum. Los ntawm kev txwv qhov txhaum tam sim no, cov khoom siv no tiv thaiv cov cuab yeej thiab cov neeg ua haujlwm los ntawm kev phom sij cuam tshuam nrog hluav taws xob ua txhaum. Tsab ntawv xov xwm no tshawb txog kev ua haujlwm, cov txiaj ntsig, thiab kev siv ntawm nruab nrab grounding resistors, qhia txog lawv qhov tseem ceeb hauv kev tswj xyuas hluav taws xob.
Dab tsi yog aNeutral Grounding Resistor?
Ib qho nruab nrab grounding resistor yog ib qho khoom siv hluav taws xob txuas nruab nrab ntawm qhov nruab nrab ntawm lub tshuab hluav taws xob lossis lub tshuab hluav taws xob thiab hauv av. Nws lub hom phiaj tseem ceeb yog txhawm rau txwv qhov tam sim no uas ntws los ntawm txoj kab nruab nrab thaum lub caij ua txhaum hauv av. Los ntawm kev qhia txog kev tiv thaiv rau hauv txoj kev hauv av, NGRs xyuas kom meej tias qhov kev ua txhaum tam sim no tau khaws cia ntawm qib tswj tau, yog li tiv thaiv kev puas tsuaj rau cov khoom siv thiab txo kev pheej hmoo ntawm kev nyab xeeb.
Nruab nrab grounding resistor
Lub Neutral Grounding Resistor ua haujlwm li cas?
Kev ua haujlwm ntawm NGR yog raws li Ohm Txoj Cai, uas tau hais tias tam sim no (I) yog sib npaug rau qhov hluav taws xob (V) faib los ntawm qhov tsis kam (R) (I = VRI = RV ). Raws li kev ua haujlwm ib txwm muaj, tsis muaj qhov tam sim no ntws los ntawm NGR vim tias tsis muaj qhov sib txawv ntawm qhov nruab nrab nruab nrab thiab hauv av. Txawm li cas los xij, thaum muaj kev txhaum hauv av-thaum qhov kev sib txuas tsis xav tau tshwm sim ntawm cov hluav taws xob thiab hauv av-qhov muaj peev xwm sib txawv tau tsim, tso cai rau tam sim no ntws. Qhov kev txiav txim no txo qhov loj ntawm qhov tam sim no ntws los ntawm lub kaw lus, tiv thaiv kom tsis txhob ncav cuag qhov txaus ntshai uas tuaj yeem ua rau cov khoom puas tsuaj lossis ua rau muaj kev phom sij xws li hluav taws xob lossis hluav taws kub. Lub NGR dissipates lub zog thaum lub sijhawm ua txhaum thaum ua kom ntseeg tau tias qhov kub thiab txias nyob hauv qhov txwv tsis pub muaj kev nyab xeeb.
Cov txiaj ntsig ntawmNeutral Grounding Resistors
1.Cov cuab yeej tiv thaiv: Los ntawm kev txwv qhov txhaum tam sim no, NGRs pab tiv thaiv transformers, generators, thiab lwm yam khoom siv hluav taws xob tseem ceeb los ntawm kev puas tsuaj thaum lub sij hawm hauv av. Qhov kev tiv thaiv no tuaj yeem txo cov nqi kho thiab kev poob qis.
2.Txhim khu kev ruaj ntseg: NGRs txo qhov kev pheej hmoo ntawm qhov teeb meem arc flash thiab hluav taws xob poob siab los ntawm kev tswj xyuas qhov txhaum tam sim no. Qhov no feature yog tshwj xeeb tshaj yog tseem ceeb nyob rau hauv industrial chaw uas cov neeg ua hauj lwm kev nyab xeeb yog qhov tseem ceeb.
3.Stabilization ntawm Phase Voltages: Thaum lub sij hawm ua txhaum cai, NGRs pab stabilize theem voltages nyob rau hauv lub system. Qhov kev ruaj khov no ua kom ntseeg tau tias cov cuab yeej txuas txuas ua haujlwm tau ntseeg tau yam tsis muaj qhov hloov pauv voltage uas tuaj yeem ua rau tsis ua haujlwm.
4.Kev Pabcuam ntawm Kev Tshawb Nrhiav Fault: Los ntawm kev txwv qhov txhaum tam sim no mus rau theem kev nyab xeeb, NGRs pab tiv thaiv cov relays thiab saib xyuas cov cuab yeej ua haujlwm tau zoo. Qhov no muaj peev xwm pab nyob rau hauv sai sai nrhiav thiab cais faults, minimizing system downtime.
5.Kev ua haujlwm txuas ntxiv: Qee qhov xwm txheej, NGRs tso cai rau kev ua haujlwm txuas ntxiv mus ib ntus thaum ib qho kev txhaum ntawm ib kab-rau-hauv av. Cov yam ntxwv no tseem ceeb heev rau kev tswj xyuas kev pabcuam txuas ntxiv hauv cov ntawv thov tseem ceeb xws li cov chaw zov me nyuam cov ntaub ntawv thiab chaw kho mob.
Kev siv ntawm Neutral Grounding Resistors
Neutral grounding resistors feem ntau yog siv rau hauv ntau lub tshuab hluav taws xob, suav nrog:
1.Tsawg-Voltage Distribution Systems: Pom nyob rau hauv cov nroj tsuag kev lag luam thiab cov tsev lag luam, NGRs yog qhov tseem ceeb rau kev tiv thaiv cov xov tooj hluav taws xob tsawg los ntawm kev ua txhaum hauv av.
2.Nruab nrab-Voltage Distribution Systems: Hauv kev siv nruab nrab-voltage (1 kV txog 36 kV), NGRs txwv tsis pub muaj kev cuam tshuam tam sim no thiab txhim kho kev ruaj ntseg.
3.Generator Neutral Grounding: Cov tshuab hluav taws xob txuas nrog cov kab ke sib cais siv NGRs los tiv thaiv kev ua txhaum ntau dhau thaum lub caij ua txhaum hauv av.
4.Transformer Neutral Grounding:Transformers hauv av wye configurations tau txais txiaj ntsig los ntawm NGRs los tiv thaiv kev ua txhaum tam sim no.
5.Renewable Energy Systems:Kev siv ntau ntxiv hauv cov chaw tsim hluav taws xob hnub ci thiab cua ua liaj ua teb, NGRs muab kev tiv thaiv hauv av thiab kev tiv thaiv txhaum cai hauv kev siv hluav taws xob tauj dua tshiab.
Xaus
Nruab nrab grounding resistorsyog cov khoom tseem ceeb hauv cov tshuab hluav taws xob niaj hnub, muab kev tiv thaiv tseem ceeb tiv thaiv hauv av thaum txhim kho tag nrho kev nyab xeeb thiab kev ntseeg tau. Los ntawm kev txwv qhov txhaum tam sim no thiab ruaj khov voltages, NGRs ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv cov cuab yeej thiab cov neeg ua haujlwm thoob plaws ntau qhov kev lag luam. Raws li cov tshuab hluav taws xob txuas ntxiv mus ntxiv, kev nkag siab thiab siv cov khoom siv nruab nrab hauv av yuav tseem ceeb heev rau kev ua kom muaj kev ncaj ncees thiab kev nyab xeeb hauv cov khoom siv hluav taws xob.
