I-magnetizing inrush current iyenzeka nini kwiziguquli?

Iimeko ze-Magnetizing inrush nazo zenzeka kwi-frequency ephezulu kakhulu kuneesekethe ezimfutshane, ngoko ke le nto ifanele ukuphononongwa.

Qwalasela okwenzekayo xa uqala ukunika amandla isiguquli senqanaba elinye. I-magnetic flux kwi-core ilingana ne-integment ye-voltage excitation.

Ukuba isiphaluka sivaliwe xa i-voltage idlula kwi-zero kwaye i-flux yokuqala i-zero, i-sinusoidal flux iya kupheliswa ngokupheleleyo kwi-zero. Ixabiso eliyincopho logutyulo olupheleleyo lwe-offset luphindwe kabini kwincopho yexabiso le-symmetrical sine wave flux. Ngamanye amazwi, incopho ye-wave ye-offset egcweleyo inokuphantse ibe kabini i-peak flux eqhelekileyo, ehlala yanele ukuqhuba undoqo kwi-saturation.

Okwangoku, ekuphela kwento ethintela imagneti yangoku kukuthintela umoya womoya, okuyimiyalelo yobukhulu obuncinci kunesiqhelo semagnetizing impedance.

Ngoko ke, ngexesha lomjikelo wesiqingatha sokuzaliswa kwe-core, i-current field inkulu kakhulu kunesiqhelo sentsimi yangoku. Ngexesha lomjikelo wesiqingatha esichaseneyo, undoqo awusahluthi kwaye intsimi yangoku iphantse ilingane nesiqhelo sentsimi yangoku.

Imeko igqithise ngakumbi xa kukho i-residual flux kumbindi kwaye isalathiso se-residual flux siyafana nesalathiso se-offset ye-sinusoidal flux wave. Njengoko kubonisiwe kuMfanekiso 2 ngezantsi. Qaphela ukuba i-Figure 1 kunye ne-2 icwangciswe kwimilinganiselo eyahlukeneyo yangoku, ngoko ke incopho yangoku ecetywayo kuMzobo we-2 ngokwenene inkulu kuneyona nto ikhoyo ngoku icwangciswe kwi-Figure 1.

02 Uvuselelo lwexabiso eliphezulu lencopho

Ukufumana incopho yangoku yokushukuma komda kuphela kukusabela kwe-air-core, kulungele ukubala ukunyanzeliswa kokujija usebenzisa iiyunithi ze-cgs:

Apha:

N - inani lekhoyili ejikayo

I-Amt - Indawo ephakathi komlinganiselo we-coil, i-cm2

l - ubude be-axial yekhoyili, cm

L - icoil inductance, μH

I-flux eveliswa yi-inductor φL ilingana ne-residual flux kunye namaxesha e-2 utshintsho oluqhelekileyo lwe-flux thabatha i-saturation flux, ekubeni i-saturation flux isentsimbi. Kodwa i-φL inxulumene ne-inductance kunye neyangoku:

Ke ngoko, i-peak inrush current ibonakaliswa kwinkqubo yeyunithi yecgs ngolu hlobo lulandelayo:

Apha:

Ipeak kwi amps kunye

φr – ukuqukuqela okushiyekileyo

φn - utshintsho oluqhelekileyo lwemagnethi

φs – ukuguquguquka kokuzaliseka

Ukuba bekungekho zichasi kwisekethe, incopho nganye elandelelanayo iya kuba nexabiso elifanayo, kwaye i-inrush yangoku iya kuqhubeka ngokungenammiselo. Nangona kunjalo, phambi kokuchasana kwisekethe, ukuhla kwamandla ombane ngaphaya kokuchasana kuya kuba kukhulu kwaye ukunyuka kwe-flux akufuneki kube phezulu njengomjikelezo wangaphambili.

Okudityanisiweyo kokuhla kwamandla ombane kubonisa ukuncitshiswa komnatha kumbane wemagnethi ofunekayo ukuxhasa umbane osetyenzisiweyo. Ekubeni i-i× R i-voltage drop isoloko ikwicala elinye, umjikelo ngamnye unciphisa i-flux magnetic efunekayo. Xa ixabiso eliphezulu le-magnetic flux liwela ngaphantsi kwexabiso le-saturation ye-core, i-inrush current iyanyamalala. Izinga lokubola alikho i-exponential, nangona lifana ne-exponential decay current.

kubalulekile! Ngeenguqu ezinkulu zamandla, i-inrush yangoku inokuhlala imizuzwana embalwa ngaphambi kokuba iphele.

Ukusabela komgca kunempembelelo yokunciphisa i-peak inrush current ngokudibanisa nje i-inductance kwi-air core inductance ye-winding. Kukho ubudlelwane obuqinisekileyo phakathi kwe-inrush yangoku kunye ne-short-circuit current, njengoko zombini zinxulumene ne-air-core inductance ye-winding.

Khumbula ukuba iisekethe ezimfutshane zikholisa ukutyhala i-flux ngaphandle kwengundoqo.

Umgaqo kabhontsi! Ngokubanzi, umthetho wobhontsi kukuba i-peak magnetizing inrush current ingaphezulu kancinane kwe-90% ye-peak short circuit yangoku. Nangona kunjalo, amandla omagnetic abangelwa yimagnetizing inrush current ahlala emncinci kakhulu kuneshort-circuit force. Ekubeni isigaba ngasinye siqulethe i-winding enye kuphela, akukho kugxothwa kwamagnetic phakathi kwee-windings.

Ingxaki yonke yokuhlalutya i-magnetizing inrush currents iba nzima ngakumbi xa kubandakanyeka abaguquli besigaba sesithathu. Oku kungenxa yokuba ii-angles zesigaba se-excitation voltages zi-120 ° ngaphandle, kukho ukusebenzisana kwangoku kunye nombane phakathi kwezigaba, kwaye izibonda ezintathu zesixhobo sokutshintsha azivalwanga ngokuchanekileyo ngexesha elinye.

Nangona kunjalo, kukhuselekile ukuthetha ukuba i-peak inrush current ye-transformer yesigaba sesithathu isondele kwinqanaba le-short-circuit current.

Enye yezinto ezinomdla kwi-magnetizing inrush currents kukuba kukho umlinganiselo omkhulu we-harmonics kuba imisinga irhoxisiwe ngokupheleleyo. Nkqu ii-harmonics nazo azifane zihlangane kwiisekethe zamandla.

03 Impompo yovelwano

Kukwakho into eyaziwa ngokuba yi-"sympathetic inrush", apho i-transformer ebinikwe amandla ngaphambili ibonisa utshintsho olukhawulezileyo lwangoku xa i-transformer ekufutshane ijika. Ukunyuka kovelwano kubangelwa yinguqu yombane womgca obangelwa yi-inrush current ye-transformer yesibini.

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