Qhov teeb meem overvoltage ntawm lub tshuab nqus tsev Circuit Court breakers tau cuam tshuam lawv txoj kev loj hlob ceev mus rau qee yam. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau kawm thiab tshawb xyuas qhov ua rau overvoltage thiab ua qee yam kev tiv thaiv hauv kev ua ke nrog kev tsim khoom.
1 Hom overvoltage tiam
1.1 Txiav tawm overvoltage
Thaum lub tshuab nqus tsev Circuit Court breaker cuam tshuam ib qho me me AC tam sim no, vim lub arc extinguishing chamber nws tus kheej, thaum tam sim no poob los ntawm lub ncov tus nqi tab sis tsis ncav cuag lub ntuj zero point, lub arc yog extinguished thiab tam sim no cuam tshuam. Cov hluav taws xob hluav taws xob seem nyob ntawm qhov inductive load yuav tsim cov overvoltage, uas peb hu ua kev txiav tawm overvoltage. Kev txiav tawm overvoltage tsis yog tshwj xeeb rau lub tshuab nqus tsev vacuum. Circuit Court breakers ntawm lwm yam xov xwm kuj muaj, tab sis lub tshuab nqus tsev Circuit Court breakers feem ntau yuav tshwm sim, tshwj xeeb tshaj yog thaum tawg me me inductive tam sim no. Tus nqi txiav tawm thiab nws cov overcurrent ntau yuav ntau dua, uas yuav ua rau muaj kev puas tsuaj rau lub zog hluav taws xob, tshwj xeeb tshaj yog cov khoom siv hluav taws xob high-voltage.
1.2 Ntau qhov kev tawm tsam overvoltage Thaum lub tshuab nqus tsev vacuum breaker tau tawg ib qho loj inductive tam sim no (xws li pib tam sim no ntawm lub cev muaj zog, thiab lwm yam), txawm tias lub overvoltage tsis yog teeb meem, overvoltage txaus ntshai tshwm sim, rhuav tshem lub rwb thaiv tsev ntawm lub cev muaj zog. tig. Qhov no feem ntau yog tshwm sim los ntawm overvoltage generated los ntawm ntau yam retrike ntawm lub tshuab nqus tsev Circuit Court breaker, uas yog hu ua ntau retrike overvoltage. Rau ntau qhov kev tawm tsam overvoltage tshwm sim, ntau yam xwm txheej yuav tsum tau ntsib, yog li qhov tshwm sim tshwm sim tsawg heev, tab sis thaum nws tshwm sim, nws tsis tuaj yeem raug kwv yees, yog li tsim nyog yuav tsum muaj kev tiv thaiv kev tiv thaiv.
1.3 Capacitive load overvoltage
Lub tshuab nqus tsev twj tso kua mis muaj kev ua tau zoo dua li lwm yam ntawm cov hluav taws xob hauv hluav taws xob hauv kev tawg lub peev xwm, tab sis thaum hloov lub hwj chim capacitor lub tsev txhab nyiaj, vim qhov tsis ruaj khov rov qab lub zog ntawm lub tshuab nqus tsev Circuit Court breaker qhov sib txawv tom qab arc thiab txo DC tiv taus theem voltage, kev tawg yuav tshwm sim. , ua rau overvoltage.
2 Kev tiv thaiv
Lub overvoltage generated thaum siv lub tshuab nqus tsev Circuit Court breakers yuav ua mob rau lub rwb thaiv tsev ntawm cov khoom siv fais fab. Yog li ntawd, cov kev ntsuas sib raug yuav tsum tau ua raws li hom overvoltage kom txo cov tiam ntawm overvoltage thiab txo tus nqi ntawm overvoltage. Ntxiv nrog rau cov teeb meem hauv kev tsim khoom ntawm lub tshuab nqus tsev vacuum breakers, cov cuab yeej tiv thaiv tuaj yeem raug teeb tsa los hloov cov kev txwv tsis pub dhau lub hom phiaj.
2.1 Kev tiv thaiv Capacitor Kev sib txuas cov capacitors nyob rau hauv parallel mus rau qhov inductive load kawg tuaj yeem txo qhov load impedance, yog li txo qhov amplitude ntawm kev txiav tawm overvoltage, thiab tuaj yeem ua rau qeeb qeeb ntawm qhov overvoltage pem hauv ntej. Qhov no tuaj yeem tsis tsuas yog tiv thaiv lub inductive load los ntawm kev puas tsuaj ntawm kev txiav tawm overvoltage, tab sis kuj txo qhov kev puas tsuaj ntawm ntau yam retrike overvoltage rau lub rwb thaiv tsev ntawm lub cev muaj zog. Lub tshuab nqus tsev Circuit Court breaker txuas nrog lub transformer los yog lub cev muaj zog nrog ib tug cable. Txij li thaum lub cable muaj ib tug loj faib capacitance, nws muaj nuj nqi yog sib npaug rau ib tug parallel capacitor, thiab cov nyhuv yog zoo heev.
2.2 Resistor-capacitor tiv thaiv Txuas resistor R thiab capacitor C nyob rau hauv series raws li kev tiv thaiv ntsiab nyob rau hauv parallel ntawm lub load input kawg los tsim ib tug RC overvoltage suppressor. Lub capacitor tuaj yeem tsis tsuas yog txo qis qhov nce siab ntawm qhov overvoltage, tab sis kuj txo cov nthwv dej impedance ntawm lub load, yog li txo qhov kev txiav tawm overvoltage. Lub luag hauj lwm ntawm tus resistor yog: thaum lub tam sim no raug txiav tawm, nws lub neej nce lub attenuation coefficient ntawm high-frequency paug Circuit Court, uas yuav txo tau tus naj npawb ntawm reignitions thiab txo lub overvoltage los ntawm ntau reignitions, thiab txawm muaj peev xwm tiv thaiv tau nws. tshwm sim. Siv RC suppressor los tiv thaiv cov khoom xws li lub cev muaj zog yog qhov zoo tshaj plaws.
2.3 Nonlinear resistor tiv thaiv
(1) Siv lub teeb ntes hluav taws xob zoo tib yam ua ke nrog lub capacitor. Lub teeb pom kev zoo tib yam tuaj yeem txwv qhov overvoltage amplitude, thiab lub capacitor tuaj yeem siv los ua kom qeeb qeeb ntawm qhov overvoltage nce.
(2) Siv cov hlau oxide hluav taws xob ntes hluav taws xob, uas siv ZnO varistor thiab yog tus ntes tsis muaj qhov sib txawv arc-extinguishing. Nws muaj cov yam ntxwv ruaj khov ntawm semiconductor transistor. Nyob rau hauv ib txwm ua haujlwm voltage, qhov tsis kam yog loj thiab tam sim no me me. Thaum qhov hluav taws xob nce mus rau qee tus nqi, qhov tsis kam txo qis, uas qhia tias muaj tus yam ntxwv ruaj khov. Nws yuav tsum raug sau tseg tias thaum siv cov hlau oxide xob laim ntes rau kev tiv thaiv overvoltage, nws cov qauv yuav tsum ua raws li qhov system voltage thiab yuav tsum tau ua kom zoo sib xws nrog cov load inductive lossis capacitor bank peev.
2.4 Kev tiv thaiv inductive A LR overvoltage suppressor muaj xws li series reactance coil (los yog saturated inductor) thiab cov resistor nyob rau hauv parallel yog txuas ntawm lub tshuab nqus tsev Circuit Court breaker thiab lub cev muaj zog fais fab cable los suppress qhov nce steepness thiab ncov tus nqi ntawm lub overvoltage.