Resonant overvoltage yog dab tsi? Wuhan UHV tshwj xeeb hauv kev tsim khoomseries resonant khoom siv, nrog ntau yam khoom xaiv thiab kev kuaj hluav taws xob. Thaum nrhiavseries resonant khoom siv, xaiv Wuhan UHV.
Hauv lub zog hluav taws xob, qee qhov inductive thiab capacitive Cheebtsam tuaj yeem tsim ntau yam oscillation circuits thaum lub sijhawm ua haujlwm lossis tsis ua haujlwm. Hauv qee qhov chaw muaj zog,series resonancephenomena tuaj yeem tshwm sim, ua rau muaj kev cuam tshuam loj heev hauv qee yam ntawm lub cev.
kev faib tawm
(1) Lub linear resonant overvoltage resonant Circuit Court yog tsim los ntawm inductive yam tsis muaj hlau cores (xws li inductance ntawm cov kab sib kis thiab to inductance ntawm transformers) los yog inductive ntsiab nrog hlau cores uas muaj excitation yam ntxwv ze rau linearity (xws li arc suppression coils) thiab capacitive ntsiab nyob rau hauv lub system.
(2) Lub ferromagnetic resonance overvoltage resonance Circuit Court yog tsim los ntawm inductive Cheebtsam nrog hlau cores (xws li tsis muaj -load transformers thiab voltage transformers) thiab capacitive Cheebtsam ntawm lub system. Vim lub saturation tshwm sim ntawm hlau core inductance Cheebtsam, cov inductance tsis nyob rau hauv Circuit Court yog nonlinear. Hom kab hluav taws xob no uas muaj cov khoom siv hluav taws xob tsis muaj hluav taws xob yuav ua rau ferromagnetic resonance thaum qee qhov kev cuam tshuam resonance tau ntsib.
(3) Parameter resonance overvoltage yog tsim los ntawm ib lub voj uas muaj cov khoom siv inductance nrog cov kev hloov pauv ntawm cov inductance tsis sib xws (xws li synchronous reactance ntawm lub tshuab hluav taws xob tseem ceeb uas sib txawv raws sijhawm ntawm Xd thiab Xq) thiab cov khoom siv hluav taws xob (xws li tsis muaj - cov kab). Thaum qhov tsis sib xws, lub zog txuas mus ntxiv mus rau qhov resonance system los ntawm kev hloov pauv hauv inductance, ua rau tsis muaj zog resonance overvoltage.
txwv kev ntsuas
(1) Kev txhim kho synchronicity ntawm kev hloov pauv yog ib qho tseem ceeb vim tias muaj ntau qhov resonant overvoltages tshwm sim nyob rau hauv tsis yog tag nrho cov theem kev khiav hauj lwm. Yog li ntawd, kev txhim kho cov synchronicity ntawm kev hloov pauv thiab tiv thaiv kev ua haujlwm tsis puv theem tuaj yeem tiv thaiv qhov tshwm sim ntawm resonant overvoltages.
(2) Txhim kho me me reactance ntawm qhov nruab nrab ntawm qhov sib npaug siab -voltage reactor tuaj yeem thaiv kev xa tawm ntawm lub zog zaus voltage thiab series resonance thaum lub sijhawm ua haujlwm tsis tiav.
(3) Ua kom puas cov xwm txheej rau lub tshuab hluav taws xob los tsim kom muaj kev zoo siab rau tus kheej thiab tiv thaiv qhov ntsuas tsis zoo resonance overvoltage. Thaum lub kaw lus resonates, nyob rau hauv qhov kev txiav txim ntawm resonance voltage thiab lub hwj chim zaus voltage, qhov sib nqus ceev ntawm PT hlau cores sai sai saturates, thiab lub excitation tam sim no nce sai, uas yuav ua rau hnyav overheating thiab puas rau lub PT winding (tag nrho cov PTs nyob rau hauv tib lub cev raug hem), thiab txawm ua rau lub tsheb loj faults thiab lub zog loj -. Yog li ntawd, yuav ua li cas kom tshem tawm resonance sai sai thaum nws tshwm sim yog tus yuam sij kom ntseeg tau tias kev ua haujlwm zoo ntawm cov khoom siv.
Cov yam ntxwv ntawm cov xwm txheej
Nyob rau hauv qhov nruab nrab tsis muaj zog hluav taws xob, vim yog cov yam ntxwv tsis zoo ntawm cov hluav taws xob hluav taws xob hluav taws xob hluav taws xob hluav taws xob (TVs), resonant overvoltage tshwm sim thaum qhov hluav taws xob hloov pauv ua rau cov reactance nyob rau hauv lub network mus rau hauv lub capacitive reactance. Tshwj xeeb tshaj yog thaum ntsib TVs thiab cov tshuab uas tsis zoo excitation yam ntxwv (nruab mus rau saturation) uas muaj ib zaug xwb -theem rau hauv av flashover los yog grounding, nws yuav ua rau resonance overvoltage. Cov mob me me tuaj yeem ua rau lub fuse ntawm lub TV kom yaj, luv luv ntawm kev tig, lossis tawg; Cov xwm txheej hnyav xws li hluav taws xob ntes hluav taws xob tawg, tsheb npav luv luv, thiab hluav taws xob hluav taws xob uas ua rau muaj kev hem thawj loj rau kev ua haujlwm nyab xeeb ntawm cov tshuab hluav taws xob thiab cov khoom siv hluav taws xob tuaj yeem tshwm sim hauv qhov xwm txheej hnyav.
Resonance ua
Rau peb tam sim no 6kV ungrounded system, lub ntsiab txoj kev yog mus qhib lub arc suppression coil thiab hloov cov kev khiav hauj lwm tsis. Feem ntau, ua kom lub arc suppression coil tuaj yeem tshem tawm resonance. Rau qhov tseem ceeb thiab siab - zaus resonance, tsuav yog lub harmonic eliminator ua haujlwm tau zoo, resonance kuj tuaj yeem raug tshem tawm. Txawm li cas los xij, rau qhov sib faib zaus resonance, uas muaj pes tsawg zaus, lub harmonic eliminator tsis tuaj yeem tshem tawm resonance. Hloov peb -theem symmetrical loads tsis ua haujlwm. Rau cov tshuab tsis muaj arc suppression coils, cov hauv qab no tuaj yeem siv raws li qhov xwm txheej tiag tiag:
1. Kev ua haujlwm ntawm qhov tseem ceeb lossis siab -frequency resonance:
1) Thaum muaj lub capacitor khiav, txiav tawm lub capacitor khiav; Thaum tsis muaj capacitors khiav, muab tso rau hauv ib txheej ntawm capacitors;
2) Thaum cov kev ntsuas saum toj no tsis tuaj yeem tshem tawm cov kev sib raug zoo, txiav tawm tag nrho cov capacitors ntawm lub busbar thiab siv rau kev xa mus rau txiav tawm qee cov feeders, nyiam dua los ntawm kev txiav cov kab ntev ua ntej.
2. Kev tuav ntawm Zaus Division Resonance:
1) Tshem tag nrho cov capacitors ntawm lub busbar;
2) Thaum resonance tsis tuaj yeem raug tshem tawm, siv rau kev xa mus txiav tawm ntawm txoj kab ntawm lub busbar kom txog thaum resonance raug tshem tawm;
3) Yog tias resonance tsis tuaj yeem raug tshem tawm txawm tias tom qab tag nrho cov kab raug txiav tawm, thov rau tus neeg xa khoom kom txiav tawm qhov hloov pauv thiab txiav tawm lub hwj chim rau lub busbar;
4) Restore fais fab mov rau busbar thiab kab.