Dab tsi yog qhov inrush tam sim no ntawm transformer
Transformer excitation inrush tam sim no, tsuas yog mloog lub npe xav tias nyuaj heev, nws muaj lwm lub npe "kaw inrush tam sim no", yog lub transformer nyob rau hauv lub tsis muaj-load kaw lub sij hawm, uas yog, cia li pib ua hauj lwm los yog reconnect rau lub hwj chim mov, nws winding mam li nco dheev ua ib tug loj tam sim no phenomenon. Hauv cov ntsiab lus nrov, ib yam li cov cuab yeej siv hluav taws xob siab hauv peb lub tsev (xws li cov tshuab cua txias) thaum pib, vim tias cov khoom siv xws li coils thiab hlau nplaum hauv cov khoom siv yuav tsum tau ceev kom ncav cuag lub xeev ua hauj lwm, nws yuav siv sij hawm ntau heev tam sim no. . Transformer inrush tam sim no yog ib txoj hauv kev zoo sib xws, tab sis tshwm sim hauv cov tub ntxhais thiab winding ntawm transformer. Qhov tam sim no yog qhov tshwj xeeb tam sim no tshwm sim nyob rau theem pib ntawm kev ua haujlwm transformer.
Ua rau ntawm transformer excitation inrush tam sim no
Cov flux residual yog superimposed nrog cov ua haujlwm flux
Peb paub hais tias lub transformer core nws tus kheej yog sib nqus conductive, thiab muaj ib tug hysteresis cov cuab yeej nyob rau hauv cov khoom tseem ceeb, uas yog, nyob rau hauv qhov kev txiav txim ntawm alternating magnetic teb, cov txheej txheem ntawm magnetization thiab demagnetization yuav tshwm sim nyob rau hauv lub core. Ua ntej lub transformer yuav muab tso rau hauv lub lag luam, tej zaum yuav muaj residual magnetic flux nyob rau hauv nws cov tub ntxhais. Dab tsi yog residual flux?
Residual magnetic flux yog hais txog cov seem sib nqus flux nyob rau hauv lub transformer core thiab coil tom qab AC fais fab mov cuam tshuam. Qhov no yog vim hais tias thaum lub transformer ua hauj lwm ib txwm, cov tub ntxhais yuav magnetized, thiab thaum lub hwj chim raug txiav tawm, lub magnetization yuav tsis tam sim ntawd ploj, tab sis yuav khaws ib feem ntawm cov magnetic flux.
Thaum lub transformer muab tso rau hauv lub lag luam, lub magnetic flux generated los ntawm kev khiav hauj lwm voltage thiab cov seem sib nqus flux nyob rau hauv cov tub ntxhais yog nyob rau hauv tib txoj kev, thiab ob yuav superimposed, uas ua rau tag nrho cov sib nqus flux deb tshaj lub saturated magnetic flux ntawm. lub hauv paus.
Core saturation
Yog tias tag nrho cov sib nqus flux tom qab stacking tshaj qhov siab tshaj plaws uas cov tub ntxhais tuaj yeem tiv taus (saturation magnetic flux), cov tub ntxhais yuav zoo li "tag nrho" thiab tsis tuaj yeem nqus cov hlau nplaum ntxiv. Lub sijhawm no, qhov tam sim no loj heev yuav raug tsim tawm, uas yog, excitation inrush tam sim no.
Qhov loj ntawm qhov excitation inrush tam sim no kuj muaj feem xyuam rau lub hwj chim mov voltage thiab thawj theem Lub kaum sab xis ntawm kev kaw, cov tub ntxhais flux tus nqi thiab cov kev taw qhia remanent ua ntej kaw, qhov sib npaug impedance tus nqi ntawm lub kaw lus thiab cov theem lub kaum sab xis, txoj kab hluav taws xob hom. lub transformer winding thiab qhov nruab nrab point grounding hom, cov yam ntxwv magnetization thiab hysteresis yam ntxwv ntawm cov khoom tseem ceeb, cov tub ntxhais qauv hom, thiab cov txheej txheem sib dhos theem.
Cov yam ntxwv ntawm transformer excitation inrush tam sim no
Lub ncov loj: lub ncov ntawm qhov excitation inrush tam sim no tuaj yeem ncav cuag 6-8 npaug ntawm qhov ntsuas tam sim no ntawm transformer, lossis ntau dua. Qhov no txhais tau hais tias thaum lub sijhawm hloov pauv hloov pauv, nws yuav muaj kev poob siab tam sim no loj heev.
Ceev attenuation: Txawm hais tias lub ncov ntawm qhov excitation inrush tam sim no loj, nws yuav lwj sai sai. Lub sij hawm attenuation ntawm lub peev xwm loj transformer yuav ntev li ntawm {{0}} vib nas this, thaum lub peev xwm me me yuav siv li 0.2 vib nas this.
Muaj cov khoom sib xyaw: qhov excitation inrush tam sim no tsis tsuas yog muaj cov khoom siv AC tam sim no xwb, tab sis kuj muaj cov khoom siv DC thiab cov khoom sib haum xeeb dua. Cov khoom no cuam tshuam cov waveform ntawm inrush tam sim no.
Kev puas tsuaj ntawm transformer excitation inrush tam sim no
Lub inrush tam sim no yuav ua rau cov tub ntxhais saturation thiab theem nrab voltage tawg ntawm lub transformer, uas yuav ua rau lub deterioration ntawm transformer rwb thaiv tsev kev ua tau zoo thiab tej zaum yuav ua rau cov khoom tsis ua hauj lwm.
Lub inrush tam sim no yuav ua rau lub transformer core kub nce, winding hlau, roj tank phab ntsa thiab lwm yam hlau Cheebtsam ua eddy tam sim no poob, ua rau lub transformer overheating, rwb thaiv tsev laus, cuam tshuam lub transformer lub neej.
High amplitude inrush tam sim no yuav ncaj qha ua rau lub cev puas tsuaj rau lub transformer thiab Circuit Court breaker, thiab tej zaum yuav txawm hlawv cov khoom.
Yuav ua li cas tiv thaiv transformer inrush tam sim no
Kev tshem tawm ntawm inrush tam sim no yog ib qho kev ntsuas tseem ceeb los xyuas kom meej tias kev ua haujlwm ruaj khov ntawm transformers thiab lub zog hluav taws xob. Lub transformer inrush tam sim no tuaj yeem cuam tshuam los ntawm kev ntsuas hauv qab no:
1. Siv lub cev muaj zog:Lub cev muaj zog zoo siab yog ib txoj hauv kev muab lub zog ruaj khov rau lub tshuab hluav taws xob los ntawm nws lub rotor. Vim hais tias lub cev muaj zog excitation muaj lub inertia ntawm lub rotor, qhov nce tus nqi ntawm cov excitation tam sim no yuav qeeb.
2. Ua kom lub zog ua haujlwm ntawm lub transformer:Ua kom qhov tsim nyog tsis kam nyob rau hauv lub excitation Circuit Court ntawm lub transformer tuaj yeem txwv qhov nce ceev ntawm qhov excitation tam sim no.
3. Kev taw qhia ntawm transformer anti-inrush tam sim no ntsuas:los ntawm kev ua kom muaj zog tiv thaiv tam sim no, xws li reactors, capacitors, thiab lwm yam, kom txo tau qhov cuam tshuam ntawm excitation inrush tam sim no ntawm cov cuab yeej, zoo nqus thiab haus inrush tam sim no lub zog, thiab tiv thaiv kev nyab xeeb ntawm transformers thiab fais fab.
4. Kev siv kaw qhov kev tsis ncaj ncees thiab kev hloov pauv remanence offset ib leeg:los ntawm kev tswj cov kev taw qhia thiab qhov loj ntawm kev kaw kev tsis ncaj ncees, kom nws thiab transformer remanence offset ib leeg, zam transformer core saturation, yog li inhibiting tiam ntawm excitation inrush tam sim no.
