Impulse Test ntawm Transformer

Cov kev kawm tseem ceeb:
●Impulse Test ntawm Transformer txhais:Ib qho kev sim impulse ntawm lub transformer xyuas nws lub peev xwm los tiv thaiv high-voltage impulses, kom ntseeg tau tias nws cov rwb thaiv tsev muaj peev xwm tswj tau tam sim ntawd spikes nyob rau hauv voltage.
● Lightning Impulse Test:Qhov kev sim no siv cov hluav taws xob zoo li hluav taws xob los ntsuas kev ntsuas hluav taws xob hluav taws xob, txheeb xyuas qhov tsis muaj zog uas tuaj yeem ua rau tsis ua haujlwm.
●Switching Impulse Test:Qhov kev sim no simulates voltage spikes los ntawm kev hloov ua haujlwm hauv lub network, uas tuaj yeem cuam tshuam kev cuam tshuam ntawm cov hluav taws xob hluav taws xob.
● Impulse Generator:Lub tshuab hluav taws xob impulse, raws li Marx Circuit Court, tsim high-voltage impulses los ntawm kev them nyiaj capacitors nyob rau hauv parallel thiab tso tawm lawv nyob rau hauv series.
● Kev Ntsuas Kev Ua Haujlwm:Cov txheej txheem xeem no suav nrog kev siv cov qauv hluav taws xob hluav taws xob thiab kaw qhov hluav taws xob thiab cov qauv nthwv dej tam sim no txhawm rau txheeb xyuas qhov cuam tshuam tsis raug.
Teeb pom kev zoo yog ib qho tshwm sim hauvcov kab sib kisvim lawv qhov siab. Qhov no xob laim stroke ntawm kabtus thawj cojua rau impulse voltage. Cov khoom siv davhlau ya nyob twg ntawm cov kab sib kis xws lifais fab mov transformerces ntsib qhov xob laim impulse voltages. Ib zaug ntxiv thaum txhua yam kev hloov pauv hauv online hauv qhov system, yuav muaj kev hloov pauv hloov pauv tshwm sim hauv lub network. Qhov loj ntawm qhov hloov pauv impulses yuav yog li 3.5 npaug ntawm qhov system voltage.
Rwb thaiv tsev yog ib qho tseem ceeb rau transformers, raws li tej yam tsis muaj zog yuav ua rau tsis ua hauj lwm. Txhawm rau txheeb xyuas nws cov txiaj ntsig, transformers raug kuaj dielectric. Txawm li cas los xij, lub zog zaus tuaj yeem ntsuas tsis txaus los qhia lub zog dielectric. Yog vim li cas qhov kev ntsuam xyuas impulse, nrog rau kev ntsuas hluav taws xob thiab kev hloov pauv impulse, tau ua
xob laim Impulse
Lub teeb ci impulse yog ib tug ntshiab ntuj phenomenon. Yog li ntawd nws yog ib qho nyuaj heev rau kwv yees qhov tseeb yoj duab ntawm ib qho kev cuam tshuam xob laim. Los ntawm cov ntaub ntawv muab tso ua ke txog ntuj xob laim, nws tuaj yeem txiav txim siab tias qhov kev cuam tshuam ntawm cov kab ke vim yog ntuj xob laim, tuaj yeem sawv cev los ntawm peb qhov yooj yim nthwv dej duab.
●Ntev nthwv dej
● Chop yoj thiab
● Pem hauv ntej nthwv dej
Txawm hais tias qhov tseeb xob laim impulse cuam tshuam yuav tsis muaj raws li peb cov duab tab sis los ntawm kev txhais cov nthwv dej no tuaj yeem tsim kom muaj qhov tsawg kawg nkaus impulse dielectric zog ntawm lub transformer.
Yog hais tias xob laim cuam tshuam mus raws txoj kab sib kis ua ntej mus txog qhovtransformer, nws cov duab nthwv dej yuav dhau los ua nthwv dej. Yog tias flash-over tshwm sim ntawm ib qho twgrwb thaiv tsevtom qab lub nthwv dej siab kawg, nws tuaj yeem dhau los ua lub nthwv dej.
Yog hais tias xob laim stroke ncaj qha hits lub transformer terminals, lub impulsehluav taws xobnce ceev kom txog thaum nws yog relieved los ntawm ib tug flash tshaj. Thaum lub sij hawm ntawm flash-dhau lub voltage mam li nco dheev vau thiab tej zaum yuav ua rau pem hauv ntej ntawm yoj duab.
Cov nyhuv ntawm cov waveforms ntawm lub rwb thaiv tsev transformer yuav txawv ntawm ib leeg. Peb tsis tau mus ntawm no hauv kev sib tham nthuav dav ntawm hom impulse voltage waveforms ua rau hom kev tsis ua haujlwm hauv transformer. Tab sis txawm li cas los xij yuav yog cov duab ntawm xob laim cuam tshuam qhov hluav taws xob nthwv dej, tag nrho cov ntawm lawv tuaj yeem ua rau lub rwb thaiv tsev tsis ua haujlwm hauv lub transformer. Yog liteeb pom kev zoo impulse kuaj ntawm transformeryog ib qho tseem ceeb tshaj plaws hom kev sim ntawm transformer.

Hloov Impulse
Los ntawm cov kev tshawb fawb thiab kev soj ntsuam qhia tau hais tias qhov kev hloov ntawm qhov hluav taws xob los yog hloov impulse yuav muaj lub sijhawm ua ntej ntawm ntau pua microseconds thiab qhov hluav taws xob no yuav raug cuam tshuam ib ntus. Lub IEC - 600060 tau txais kev pom zoo rau lawv qhov kev hloov pauv impulse, lub nthwv dej ntev muaj lub sijhawm ua ntej 250 μs thiab lub sijhawm mus rau ib nrab tus nqi 2500 μs nrog kev zam.
Lub hom phiaj ntawm qhov kev ntsuas hluav taws xob impulse yog los xyuas kom meej tias covtransformerrwb thaiv tsev tiv thaiv xob laim overvoltage uas yuav tshwm sim hauv kev pabcuam.

Lub impulse generator tsim yog raws li Marx Circuit Court. Daim duab kos duab hauv paus yog qhia rau daim duab saum toj no. Lub impulsecapacitorsCs (12 capacitors ntawm 750 ηF) raug them nyob rau hauv parallel los ntawm kev them nyiajresistorsRc (28 kΩ) (siab tshaj plaws tso cai them hluav taws xob 200 kV). Thaum tus nqi them hluav taws xob tau mus txog qhov xav tau, kev tawg ntawm qhov sib txawv F1 yog pib los ntawm kev ua rau sab nraud. Thaum F1 tawg, lub peev xwm ntawm theem hauv qab no (point B thiab C) nce. Vim hais tias cov resistors series Rs yog tsawg-ohmic tus nqi piv nrog cov discharging resistors Rb (4,5 kΩ) thiab them resistor Rc, thiab txij li thaum lub low-ohmic discharging resistor Ra yog sib cais los ntawm lub Circuit Court los ntawm lub auxiliary spark-gap Fal. , qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv F2 nce siab heev thiab kev tawg ntawm F2 tau pib.
Yog li ntawd, lub txim-ntev yog ua rau tawg nyob rau hauv ib theem zuj zus. Yog li ntawd, cov capacitors raug tso tawm nyob rau hauv series-kev twb kev txuas. Lub siab-ohmic tawm resistors Rb yog dimensioned rau switching impulses thiab low-ohmic resistors Ra rau xob laim impulses. Cov resistors Ra yog txuas nrog nyob rau hauv parallel nrog cov resistors Rb, thaum lub auxiliary spark-gaps tawg, nrog ib tug ncua sij hawm ntawm ob peb puas nano-seconds.
Qhov kev npaj no ua kom lub tshuab hluav taws xob ua haujlwm zoo.
Cov duab yoj thiab lub ncov tus nqi ntawm lub impulse voltage yog ntsuas los ntawm ib qho Impulse Analyzing System (DIAS 733) uas txuas nrogvoltage divider. Qhov yuav tsum tau muaj qhov hluav taws xob yog tau los ntawm kev xaiv tus naj npawb tsim nyog ntawm cov theem sib txuas thiab los ntawm kev hloov kho qhov them nqi hluav taws xob. Txhawm rau kom tau txais qhov tsim nyog tso tawm hluav taws xob sib txuas lossis sib txuas sib txuas ntawm lub tshuab hluav taws xob tuaj yeem siv. Nyob rau hauv cov ntaub ntawv no, ib co ntawm cov capacitors txuas nyob rau hauv parallel thaum lub sij hawm tso tawm.
Qhov xav tau impulse zoo yog tau los ntawm cov kev xaiv tsim nyog ntawm cov series thiab tawm resistors ntawm lub tshuab hluav taws xob.
Lub sij hawm pem hauv ntej tuaj yeem xam kwv yees li ntawm qhov sib npaug:
Rau R1 >> R2 thiab Cg >> C (15.1)
Tt = .RC123
thiab ib nrab sij hawm mus rau ib nrab nqi los ntawm qhov sib npaug
T ≈ 0,7.RC
Nyob rau hauv kev xyaum, lub xeem Circuit Court yog dimensioned raws li kev paub.

Kev Ua Haujlwm ntawm Impulse Test
Qhov kev sim yog ua nrog tus qauv xob laim impulses ntawm qhov tsis zoo polarity. Lub sij hawm pem hauv ntej (T1) thiab lub sij hawm mus rau ib nrab-tus nqi (T2) yog txhais raws li tus qauv.
Standard xob laim impulse
Pem hauv ntej lub sij hawm T1 = 1.2 μs ± 30%
Lub sij hawm mus rau ib nrab-tus nqi T2 = 50 μs ± 20%

Hauv kev xyaum, cov duab impulse yuav txawv ntawm tus qauv impulse thaum kuaj qis-voltage windings ntawm siab ntsuas lub zog thiab windings ntawm siab input capacitance. Qhov kev ntsuam xyuas impulse yog ua nrog qhov tsis zoo polarity voltages kom tsis txhob cuam tshuam flash overs nyob rau hauv lub rwb thaiv tsev sab nraud thiab kuaj Circuit Court. Kev hloov kho Waveform yog tsim nyog rau feem ntau cov khoom kuaj. Cov kev paub dhau los ntawm cov txiaj ntsig ntawm kev sim ntawm cov khoom sib xws lossis kev suav ua ntej ua ntej tuaj yeem muab kev taw qhia rau kev xaiv cov khoom siv rau lub yoj shaping circuit.
Qhov kev sim ua ntu muaj ib qho kev siv impulse (RW) ntawm 75% ntawm tag nrho cov amplitude ua raws li cov lus teev tseg ntawm cov ntawv thov hluav taws xob ntawm tag nrho amplitude (FW) (raws li IEC 60076-3 peb lub zog tag nrho). Cov khoom siv rau voltage thiabtam sim noCov ntaubntawv povthawj siv muaj xws li digital transient recorder, monitor, computer, plotter thiab printer. Cov ntaub ntawv kaw tseg ntawm ob theem tuaj yeem muab piv ncaj qha rau kev qhia tsis ua haujlwm. Rau regulating transformers ib theem yog sim nrog lub on-load kais changer teem rau qhov ntsuashluav taws xobthiab ob theem lwm yam raug sim nyob rau hauv txhua txoj hauj lwm huab.

Kev sib txuas ntawm Impulse Test
Tag nrho cov kev ntsuam xyuas dielectric xyuas cov rwb thaiv tsev theem ntawm txoj haujlwm. Impulse generator yog siv los tsim cov lus teev tseghluav taws xobimpulse nthwv dej ntawm 1.2/50 micro vib nas this yoj. Ib tug impulse ntawm ib tug txohluav taws xobnruab nrab ntawm 50 mus rau 75% ntawm tag nrho cov kev xeem voltage thiab tom qab peb impulses ntawm tag nrho cov voltage.

Rau ibpeb theem transformer, impulse yog nqa tawm ntawm tag nrho peb theem nyob rau hauv succession.
Qhov hluav taws xob yog siv rau ntawm txhua qhov ntawm kab davhlau ya nyob twg nyob rau hauv succession, ua kom lwm yam terminals earthed.
Cov duab tam sim no thiab qhov hluav taws xob yoj tau raug kaw rau ntawm oscilloscope thiab txhua qhov kev cuam tshuam hauv cov duab yoj yog cov qauv rau kev ua tsis tiav.