Dab tsi yog Txoj Kev Grounding Rau Siab -voltage Switchgear?
Apr 09, 2026
Tso lus
I. System Neutral Point Grounding Methods
1. Ungrounded Neutral Point: Lub ntsiab lus nruab nrab yog insulated los ntawm hauv av. Nyob rau hauv cov ntaub ntawv ntawm ib qho - theem av txhaum, qhov txhaum tam sim no me me, thiab peb - theem kab hluav taws xob tseem sib luag, tso cai rau kev ua haujlwm nrog qhov txhaum rau 1-2 teev. Feem ntau yog siv nyob rau hauv 6-10kV systems nrog ib tug capacitive tam sim no tsawg tshaj li 10A, xws li industrial thiab mining fais fab sib txuas thiab nyob deb nroog daim phiaj.
2. Cov Ntsiab Lus Nruab Nrab Nruab Nrab Los ntawm Arc Txhaum Chev: Nyob rau hauv rooj plaub ntawm ib qho - theem hauv av txhaum, qhov inductive tam sim no them rau qhov tam sim no capacitive, suppressing arc reignition. Feem ntau yog siv rau hauv cov tshuab nrog lub peev xwm tam sim no ntawm 10A-30A lossis siab dua, thiab cov kev xav tau siab rau cov khoom siv hluav taws xob muaj kev ntseeg siab, xws li cov chaw lag luam loj thiab cov hluav taws xob tsuas thiab cov kev faib hauv nroog.
3. Cov Ntsiab Lus Nruab Nrab Nruab Nrab Los Ntawm Cov Hluav Taws Xob Me: Txwv tsis pub dhau qhov hluav taws xob, tso cai rau qhov cuam tshuam loj dua, thiab ua kom nrawm nrawm ntawm kev tiv thaiv circuits. Feem ntau yog siv nyob rau hauv cov tshuab uas muaj lub peev xwm loj loj los yog rhiab rau cov qib overvoltage, xws li hauv nroog cov phiaj xwm hluav taws xob tswj hwm los ntawm cov kab hluav taws xob thiab cov hluav taws xob cog hluav taws xob.
4. Direct Neutral Grounding: Direct nruab nrab grounding tshwm sim nyob rau hauv ib zaug xwb -theem luv luv Circuit Court raws li ib tug -theem av txhaum, tam sim ntawd tripping lub tiv thaiv system. Txoj kev no feem ntau yog siv nyob rau hauv 110kV thiab siab tshaj -voltage systems, thiab tsis tshua muaj siv nyob rau hauv 3-35kV nruab nrab-voltage switchgear, tsuas yog nyob rau hauv low-voltage 400V systems.
II. Cov cuab yeej siv (Cab thaiv thiab txee) Cov txheej txheem tiv thaiv av
1. Main Grounding Busbar (PE Line): Ib qho tooj liab grounding busbar yog ntsia thoob plaws hauv lub switchgear, nrog ib tug ntoo khaub lig-sectional cheeb tsam ntsib thermal stability (feem ntau ntau dua los yog sib npaug rau 30 × 4mm² los yog loj dua).
Tag nrho cov ntaub thaiv hlau, qhov rooj, cov khoom sib faib, cov tsheb thauj khoom, thiab cov khoom siv hluav taws xob hauv nruab nrab txuas nrog rau lub tsheb npav no siv cov xim daj -ntsuab bicolor hlau.
2. Combined Grounding (TN-S System): Lub switchgear's grounding busbar yog txuas nrog lub substation lub ntsiab hauv av kab sib chaws, tsim ib daim ntawv cog lus equipotential. Ib txhij, qhov nruab nrab taw tes (N kab) thiab tiv thaiv lub ntiaj teb (PE kab) yog sib cais nyob rau hauv qis -voltage sab ntawm transformer, nrog tag nrho cov rwb thaiv tsev cais tom qab ntawd.
3. Grounding Switch Manual / hluav taws xob grounding keyboards feem ntau ntsia rau ntawm txoj kab tawm sab lossis busbar sab ntawm switchgear. Cov no yog siv los ua luv luv -circuit thiab av cov kab thaum lub sij hawm tu kom tsis txhob rov qab los yog electrostatic induction. Lawv txoj haujlwm yuav tsum yog mechanically lossis hluav taws xob cuam tshuam nrog lub Circuit Court breaker thiab disconnector (tsib- pov thawj).
III. Grounding Methods by Function
1. Kev tiv thaiv hauv av: Txuas qhov ib txwm tsis yog - lub zog hlau casing lossis thav duab ntawm cov khoom siv rau lub ntiaj teb los tiv thaiv hluav taws xob raug mob los ntawm kev rwb thaiv tsev tsis ua haujlwm.
2. Functional Grounding: Muab qhov xoom ruaj khov- muaj peev xwm siv tau rau lub zog hluav taws xob kom ntseeg tau tias kev ua haujlwm ib txwm muaj.
3. Kev tiv thaiv xob laim hauv av: Muab txoj hauv kev rau xob laim tam sim no kom ntws mus rau hauv av, tiv thaiv kev puas tsuaj rau cov khoom siv los ntawm xob laim overvoltage.
4. Anti-Static Grounding: Tiv thaiv kom tsis txhob muaj cov nqi hluav taws xob zoo li qub thiab tshem tawm cov teeb meem ntawm cov hluav taws xob zoo li qub rau cov khoom siv hluav taws xob thiab qhov chaw tawg thiab tawg.
5. Shielding Grounding: Tshem tawm electromagnetic cuam tshuam thiab ua kom lub cev ua haujlwm ntawm cov khoom siv hluav taws xob thiab kev sib txuas lus.
IV. Txoj kev tshwj xeeb hauv av
1. Siab -kuj Grounding: Tsis tshua muaj, siv los txwv arc grounding overvoltage, tab sis qhov txhaum tam sim no me me (tsawg dua lossis sib npaug li 10A), yuav tsum muaj kev tiv thaiv siab - rhiab heev.
2. Grounding ntawm Ungrounded Systems ntawm Arc Suppression Txee: Lub arc suppression txee (muaj ib lub tshuab nqus tsev contactor thiab siab -voltage resistor) yog ntsia rau ntawm lub busbar rau artificially tsim ib tug metallic av rau tua lub arc, tab sis nws muaj tej yam txaus ntshai thiab tsis tshua pom zoo nyob rau hauv niaj hnub engineering.