Kev ntsuas lub zog zoo yog qhov voltage thiab zaus.Voltage imbalance cuam tshuam rau lub zog zoo.Qhov nce, txo lossis theem poob ntawm theem voltage yuav cuam tshuam rau kev ua haujlwm nyab xeeb ntawm cov khoom siv hluav taws xob thiab cov neeg siv hluav taws xob zoo rau qhov sib txawv.Muaj ntau ntau qhov laj thawj rau qhov tsis sib xws ntawm qhov kev them nyiaj.Tsab ntawv xov xwm no qhia txog rau qhov ua rau muaj qhov tsis sib xws yog txheeb xyuas kom meej, thiab cov xwm txheej sib txawv tau txheeb xyuas thiab daws nrog.
Ntsiab lus: them nyiaj system voltage;tsis sib npaug;tsom xam thiab ua
ua
1 Lub cim ntawm voltage unbalance
1.1 Lub hauv av capacitance ntawm theem voltage unbalanced network tshwm sim los ntawm qhov tsis tsim nyog them nyiaj kawm ntawv thiab tag nrho cov arc suppression coils nyob rau hauv cov nyiaj them system tsim ib tug series resonant Circuit Court nrog asymmetric voltage UHC raws li lub hwj chim mov, thiab qhov nruab nrab point displacement voltage yog:
UN=[uo/(P+jd)] · Ux
Nyob rau hauv cov mis: uo yog asymmetry degree ntawm lub network, ib tug system them nyiaj kawm ntawv: d yog lub damping tus nqi ntawm lub network, uas yog kwv yees li sib npaug zos rau 5%;U yog qhov system fais fab mov theem voltage.Nws tuaj yeem pom los ntawm cov qauv saum toj no tias qhov me me ntawm cov nyiaj them poob haujlwm, qhov siab dua qhov nruab nrab point voltage.Txhawm rau kom tsis txhob muaj qhov nruab nrab ntawm qhov hluav taws xob los ntawm qhov siab dhau thaum lub sijhawm ua haujlwm ib txwm ua, cov nyiaj them rov qab thiab cov nyiaj nyob ze yuav tsum tau zam thaum lub sijhawm ua haujlwm, tab sis nyob rau hauv cov xwm txheej zoo li cas los xij, nws feem ntau tshwm sim: ① Cov nyiaj them poob haujlwm tsawg dhau, vim yog qhov ua tau zoo. capacitor tam sim no thiab inductance tam sim no ntawm arc suppression coil IL = Uφ / 2πfL vim qhov kev hloov pauv ntawm kev khiav hauj lwm voltage thiab lub voj voog, ob qho tib si IC thiab IL tuaj yeem hloov pauv, yog li hloov pauv cov nyiaj laus degree.Lub kaw lus mus los yog tsim cov nyiaj them rov qab.② Lub hwj chim ntawm cov kab yog nres.Thaum tus neeg teb xov tooj kho lub arc suppression coil, nws yuam kev tso tus kais hloov pauv hauv txoj haujlwm tsis tsim nyog, ua rau pom tseeb qhov nruab nrab ntawm qhov hloov pauv, thiab tom qab ntawd qhov tshwm sim ntawm theem voltage imbalance.③Nyob rau hauv daim phiaj hluav taws xob tsis tau them nyiaj, qee zaum vim muaj kab tsis zoo, lossis hluav taws xob tsis zoo vim muaj kev txwv tsis pub siv hluav taws xob thiab kev saib xyuas, lossis vim tias txoj kab tau muab tso rau hauv lub zog hluav taws xob ntau dhau, yuav muaj nyob ze lossis tsim cov nyiaj them rov qab, ua rau nyob rau hauv nruab nrab loj.Qhov taw tes yog hloov chaw, thiab theem voltage unbalance tshwm sim.
1.2 Qhov tsis sib xws ntawm qhov hluav taws xob tshwm sim los ntawm PT disconnection ntawm qhov ntsuas hluav taws xob Cov yam ntxwv ntawm qhov tsis sib xws ntawm qhov hluav taws xob tshwm sim los ntawm PT thib ob fuse tshuab thiab thawj riam hloov tsis zoo los yog tsis ua haujlwm puv;Cov teeb liab hauv av tuaj yeem tshwm sim (PT thawj qhov kev cuam tshuam), ua rau qhov ntsuas qhov hluav taws xob ntawm qhov kev sib txuas yog qhov tsawg heev lossis tsis muaj qhov taw qhia, tab sis tsis muaj qhov hluav taws xob nce siab, thiab qhov tshwm sim no tsuas yog tshwm sim hauv qee qhov hloov pauv.
1.3 Voltage unbalance them nyiaj los ntawm ib-theem grounding ntawm lub system Thaum lub system yog ib txwm, lub asymmetry yog me me, qhov voltage tsis loj, thiab lub peev xwm ntawm qhov nruab nrab point yog ze rau lub peev xwm ntawm lub ntiaj teb.Thaum cov hlau hauv av tshwm sim ntawm ib qho chaw ntawm ib txoj kab, busbar lossis cov khoom siv nyob, nws yog nyob rau tib lub peev xwm raws li hauv av, thiab tus nqi hluav taws xob ntawm ob theem ib txwm mus rau hauv av nce mus rau theem-rau-theem voltage, ua rau muaj qhov cuam tshuam loj nruab nrab.Kev sib txawv tsis sib xws, ob theem ib txwm voltages nyob ze los yog sib npaug ntawm cov kab hluav taws xob, thiab cov amplitudes yeej zoo ib yam.Cov kev taw qhia ntawm qhov nruab nrab point displacement voltage yog nyob rau tib txoj kab ncaj nraim raws li hauv av theem voltage, thiab cov kev taw qhia yog opposite rau nws.Qhov kev sib raug zoo ntawm phasor yog qhia hauv daim duab 2. qhia.
1.4 Qhov tsis sib xws ntawm qhov hluav taws xob tshwm sim los ntawm ib theem kev cuam tshuam ntawm txoj kab ua rau kev hloov pauv ntawm qhov tsis sib xws hauv lub network tom qab kev sib txuas ib zaug, uas ua rau lub asymmetry nce ntxiv, uas ua rau muaj qhov hloov pauv loj ntawm qhov nruab nrab ntawm qhov nruab nrab. daim phiaj hluav taws xob, ua rau muaj peb theem ntawm qhov system.Unbalanced hauv av voltage.Tom qab qhov kev sib txuas ib zaug ntawm lub kaw lus, qhov kev paub dhau los yog qhov hluav taws xob ntawm qhov kev sib txuas ntawm cov theem txuas ntxiv thiab qhov voltage ntawm ob theem ib txwm txo qis.Txawm li cas los xij, vim qhov sib txawv ntawm txoj hauj lwm ntawm ib-theem disconnection, kev khiav hauj lwm tej yam kev mob thiab influencing yam, cov kev taw qhia thiab qhov loj ntawm qhov nruab nrab point displacement voltage thiab qhov taw qhia ntawm txhua theem-rau-hauv av voltage tsis zoo ib yam;Sib npaug los yog sib npaug, qhov hluav taws xob ntawm cov khoom siv hluav taws xob mus rau hauv av ntawm qhov kev sib txuas ntawm theem txo qis;los yog qhov voltage ntawm ib txwm theem mus rau hauv av txo, thiab qhov voltage ntawm lub disconnected theem thiab lwm yam ib txwm theem mus rau hauv av nce tab sis lub amplitudes tsis sib npaug.
1.5 Voltage unbalance tshwm sim los ntawm inductive coupling ntawm lwm yam kev them nyiaj systems.Ob txoj kab ntawm ob qho kev them nyiaj rau kev xa hluav taws xob sib txuas yog nyob ze thiab cov kab sib txuas tau ntev, los yog thaum lub qhov qhib qhib tau tsim tsa rau tib tus ncej rau thaub qab, ob kab yog txuas nrog hauv cov kab sib txuas los ntawm cov kab sib txuas ntawm cov kab sib txuas.resonant Circuit Court.Phase-to-ground voltage imbalance tshwm sim.
1.6 Theem voltage unbalanced los ntawm resonance overvoltage Ntau yam nonlinear inductive ntsiab nyob rau hauv daim phiaj fais fab, xws li transformers, electromagnetic voltage transformers, thiab lwm yam.Thaum lub tsheb npav khoob raug them, txhua theem ntawm lub tshuab hluav taws xob hluav taws xob hluav taws xob hluav taws xob thiab hauv av capacitance ntawm lub network tsim ib qho kev ywj pheej oscillation Circuit Court, uas yuav ua rau ob-theem voltage nce, ib-theem voltage txo los yog opposite theem voltage imbalance.Qhov no ferromagnetic resonance, Nws tsuas yog tshwm sim ntawm lub tsheb npav nkaus xwb thaum them lub tsheb npav khoob los ntawm lub tshuab hluav taws xob nrog lub zog ntawm lwm qib voltage.Nyob rau hauv ib qho system nrog ib tug voltage theem, qhov teeb meem no tsis muaj nyob rau hauv lub thib ob substation tsheb npav yog them los ntawm lub hwj chim kis tau tus mob lub ntsiab kab.Txhawm rau kom tsis txhob muaj lub tsheb thauj khoom khoob, ib kab ntev yuav tsum tau them ua ke.
2 Kev txiav txim thiab kev kho ntawm ntau yam voltage imbalances nyob rau hauv lub system ua hauj lwm
Thaum lub sij hawm voltage unbalance tshwm sim nyob rau hauv lub system ua hauj lwm, feem ntau ntawm lawv yog nrog los ntawm grounding signals, tab sis qhov voltage unbalance tsis yog tag nrho cov grounded, yog li cov kab yuav tsum tsis txhob xaiv blindly, thiab yuav tsum tau soj ntsuam thiab txiav txim los ntawm cov nram qab no yam:
2.1 Nrhiav qhov ua rau ntawm qhov tsis sib npaug ntawm theem voltage
2.1.1 Yog hais tias qhov hluav taws xob tsis sib npaug yog txwv rau ib qho kev soj ntsuam thiab tsis muaj qhov hluav taws xob nce theem, ua rau tus neeg siv tsis muaj theem poob teb, chav tsev PT Circuit Court raug txiav.Lub sijhawm no, tsuas yog xav txog seb qhov kev tiv thaiv ntawm cov khoom siv hluav taws xob puas tuaj yeem ua haujlwm tsis zoo thiab cuam tshuam rau kev ntsuas.Txawm hais tias qhov ua rau tsis muaj qhov sib npaug yog vim qhov tsis sib npaug ntawm cov khoom sib txuas ntawm lub ntsiab Circuit Court, uas ua rau cov zaub tsis sib npaug, thiab seb nws yog tshwm sim los ntawm qhov tsis ua haujlwm ntawm lub vijtsam.
2.1.1 Yog hais tias qhov hluav taws xob tsis sib npaug tshwm sim ntawm txhua qhov ntsuas hluav taws xob hauv qhov system tib lub sijhawm, qhov ntsuas hluav taws xob ntawm txhua qhov ntsuas yuav tsum raug kuaj xyuas.Qhov tsis sib npaug ntawm qhov hluav taws xob yog qhov pom tseeb, thiab muaj cov theem txo qis thiab nce qib, thiab cov lus qhia ntawm txhua qhov ntsuas qhov ntsuas hluav taws xob yog qhov zoo ib yam.Qhov xwm txheej uas ua rau qhov txawv txav voltage kuj tseem tshwj xeeb heev xws li kev sib cuag tsis zoo ntawm busbar voltage transformer.Nws kuj tseem ua tau tias ob peb yam sib xyaw ua ke.Yog tias qhov laj thawj ntawm qhov txawv txav tsis tuaj yeem pom, qhov txawv txav yuav tsum tau muab tshem tawm ntawm kev ua haujlwm thiab xa mus rau cov neeg ua haujlwm saib xyuas kev ua haujlwm.Raws li ib tug dispatcher thiab tus neeg teb xov tooj, nws yog txaus los txiav txim seb qhov ua rau ntawm qhov txawv txav nyob rau hauv lub busbar voltage hloov thiab cov nram qab no circuits, thiab restore lub system voltage mus li qub.Cov laj thawj yuav yog:
①Cov nyiaj them poob haujlwm tsis tsim nyog, lossis kev hloov kho thiab kev ua haujlwm ntawm arc suppression coil tsis raug.
② Nyob rau hauv-compensated system, muaj kab sib tsoo mus ncig nrog qhov sib npaug.
③Thaum lub load tsawg, qhov zaus thiab voltage hloov tau zoo heev.
4. Tom qab kev sib tsoo tsis sib xws xws li hauv av tshwm sim hauv lwm qhov kev them nyiaj, qhov nruab nrab ntawm qhov kev hloov pauv ntawm qhov system yog tshwm sim, thiab qhov tsis sib xws ntawm qhov hluav taws xob los ntawm qhov teeb meem them nyiaj yuav tsum tau kho.Kev them nyiaj degree yuav tsum tau kho.
Rau qhov tsis sib xws ntawm qhov hluav taws xob tshwm sim los ntawm kev poob ntawm cov kab hluav taws xob hauv kev ua haujlwm tsis tau them nyiaj, nws yog qhov yuav tsum tau sim hloov cov nyiaj them poob haujlwm thiab kho lub arc suppression coil.Thaum lub load nyob rau hauv lub network yog nyob rau hauv ib tug trough, qhov voltage unbalance tshwm sim thaum lub voj voog thiab voltage nce, thiab arc suppression coil tuaj yeem hloov kho tom qab qhov tsis sib npaug ploj lawm.Raws li ib tug dispatcher, koj yuav tsum paub cov yam ntxwv no kom raug txiav txim thiab sai sai nrog ntau yam txawv txav uas yuav tshwm sim thaum lub sijhawm ua haujlwm.Kev txiav txim siab ntawm ib qho tshwj xeeb yog qhov yooj yim, thiab kev txiav txim siab thiab kev ua haujlwm ntawm qhov tsis sib xws ntawm qhov voltage tshwm sim los ntawm kev ua txhaum ntawm ob lossis ntau qhov xwm txheej yog qhov nyuaj.Piv txwv li, ib-theem grounding los yog resonance feem ntau yog nrog high-voltage fuse tshuab thiab low-voltage fuse tshuab.Thaum lub high-voltage fuse tsis yog tag nrho tshuab, seb lub grounding teeb liab raug xa los yog tsis nyob ntawm qhov thib ob qhov hluav taws xob teeb tsa tus nqi ntawm cov teeb liab grounding thiab degree ntawm tshuab fuse.Kev txiav txim siab los ntawm kev ua haujlwm tiag tiag, thaum qhov hluav taws xob tsis zoo, lub voj voog thib ob feem ntau txawv txav.Nyob rau lub sijhawm no, txawm hais tias qhov voltage thiab grounding signals raug xa tawm, tus nqi siv tsis loj.Nws yog ib qho tseem ceeb tshwj xeeb kom paub txog txoj cai ntawm kev tshawb nrhiav thiab daws qhov txawv txav tsis zoo.
2.2 Kev txiav txim qhov ua rau raws li qhov loj ntawm cov theem voltage unbalance.Piv txwv li, qhov tsis sib haum xeeb theem loj tshwm sim nyob rau hauv txhua lub chaw nres tsheb thaum lub sijhawm ua haujlwm ntawm lub kaw lus, qhia tias muaj ib theem av lossis ib-theem disconnection hauv cov kab tseem ceeb hauv lub network, thiab txhua qhov ntsuas hluav taws xob yuav tsum tau tshawb xyuas sai.Raws li qhov ntsuas voltage ntawm txhua theem, ua qhov kev txiav txim siab.Yog hais tias nws yog ib qho yooj yim ib-theem grounding, koj tuaj yeem xaiv txoj kab los tshawb nrhiav raws li cov kab lus teev tseg.Xaiv thawj zaug los ntawm lub qhov hluav taws xob ntawm lub chaw nres tsheb fais fab, uas yog, tom qab xaiv lub pob zeb hauv av raws li lub hauv paus ntsiab lus ntawm "hauv paus ua ntej, tom qab ntawd taw qhia", thiab tom qab ntawd xaiv cov av hauv cov ntu.
2.3 Kev txiav txim siab vim li cas raws li kev hloov pauv ntawm cov khoom siv hauv lub cev ① Ib qho kev txawv txav tshwm sim nyob rau hauv qee theem ntawm peb theem winding ntawm lub transformer, thiab lub asymmetric fais fab mov voltage yog xa.② Cov kab sib kis tau ntev, ntu ntu ntawm tus neeg xyuas pib tsis sib xws, thiab qhov impedance thiab voltage poob yog qhov sib txawv, ua rau muaj qhov tsis sib npaug ntawm txhua theem.③ Lub hwj chim thiab teeb pom kev zoo sib xyaw thiab sib koom, thiab muaj ntau qhov kev thauj khoom ib-theem, xws li cov khoom siv hauv tsev, cov tshuab hluav taws xob, cov tshuab vuam, thiab lwm yam yog cov concentrated rau ib lossis ob theem, uas ua rau tsis sib npaug ntawm lub zog thauj khoom ntawm txhua qhov theem, ua rau lub hwj chim mov voltage thiab tam sim no inconsistent.tshuav nyiaj li cas.
Piv txwv li, nyob rau hauv lub lag luam ntawm lub me me tam sim no grounding system (pab system) grounded los ntawm lub arc suppression coil, theem voltage unbalance phenomenon tshwm sim nyob rau hauv lub sij hawm mus rau lub sij hawm, thiab vim txawv yog vim li cas, cov degree thiab cov yam ntxwv ntawm lub unbalance. txawv.Tab sis qhov teeb meem dav dav yog tias daim phiaj hluav taws xob tau khiav hauv lub xeev tsis zoo, thiab qhov nce, txo lossis theem poob ntawm theem voltage yuav cuam tshuam rau kev nyab xeeb ntawm cov khoom siv hluav taws xob thiab cov neeg siv khoom ntau ntau.
Post lub sij hawm: Aug-29-2022