Vim li cas voltage transformers nthuav tawm ferroresonance?

Nyob rau hauv ib txwm muaj xwm txheej, cov tub ntxhais ntawm ib qho hluav taws xob transformer yog unsaturated, thiab coil inductive reactance ntau dua li cov kab capacitive reactance, yog li ferroresonance yuav tsis tshwm sim. Txawm li cas los xij, thaum qhov kev ua txhaum ploj mus, lossis thaum lub busbar unloaded txuas nrog, txoj kab yog grounded, los yog xob laim tawg, peb -theem tej zaum yuav hloov, thiab inrush tam sim no ntawm lub capacitor ntws los ntawm lubvoltage transformercoil. Tam sim no ntawmvoltage transformernce, ua rau lub kauj kom saturate thiab tus nqi inductance yuav txo tau sai. Thaum Xl=1/Xc, ferroresonance tshwm sim.

voltage transformers

Daim duab saum toj no qhia txog cov kab hluav taws xob hluav taws xob txuas hluav taws xob, qhov twg L yog qhov sib nqus inductance ntawm lub ntsuas hluav taws xob, L0 yog lub busbar - rau - hauv av inductance, thiab C0 yog lub busbar - mus - av capacitance.

Yog li ntawd, thaum ib tug busbar raug kaw nyob rau hauv ib tug ob chav busbar kev twb kev txuas, yog hais tias lub busbar Circuit Court breaker muaj resonance tej yam kev mob, lub thawj cais hloov ntawm lub busbar transformer yuav tsum tau qhib ua ntej, thiab ces lub Circuit Court breaker yuav tsum tau qhib los tiv thaiv lub ferromagnetic resonance ntawm lub tsheb npav khi hloov lub disconnect capacitance thiab lub busbar transformer.

Yog vim li cas rau Ferromagnetic Resonance nyob rau hauv Voltage Transformers

Nyob rau hauv ungrounded neutral systems, ferroresonant phenomenon nyob rau hauvvoltage transformers(PTs) feem ntau muaj feem cuam tshuam nrog cov yam ntxwv tsis muaj kab inductance ntawm covvoltage transformerthiab LC Circuit Court tsim los ntawm qhov system capacitance. Cov hauv qab no yog cov lus piav qhia ntxaws:

Nonlinear Inductance Yam ntxwv ntawm Voltage Transformers

Nyob rau hauv ib txwm ua hauj lwm, lub magnetization nkhaus ntawm lubvoltage transformercore yog nyob rau hauv cov kab tawm, thiab tus nqi inductance tseem nyob ruaj khov. Txawm li cas los xij, thaum qee qhov kev cuam tshuam tshwm sim hauv lub cev, xws li ib qho - theem hauv av txhaum, qhov voltage ntawm lub faulty theem txo qis, thaum lub voltage ntawm qhov tsis yog -faulty theem nce, ua rau cov tub ntxhais saturation. Tom qab cov tub ntxhais saturation, tus nqi inductance ntawm lub voltage transformer txo nrog nce tam sim no, nthuav tawm cov yam ntxwv uas tsis yog-linear inductance.

Capacitors thiab Nonlinear Inductance tsim ib qho Resonant Circuit Court

Nyob rau hauv ungrounded nruab nrab systems, muaj faib capacitance ntawm tus neeg xyuas pib thiab hauv av, thiab stray capacitance ntawm theem ntawm busbar thiab kab. Cov capacitances, nrog rau cov inductance ntawm lubvoltage transformer, tsim ib qho LC resonant circuit. Thaum lubJDZW-35 voltage transformercore saturates, qhov kev hloov ntawm nws tus nqi inductance ua rau muaj kev hloov pauv hauv lub ntuj zaus ntawm lub voj voog. Thaum qhov zaus ntawm cov khoom siv hluav taws xob sib npaug los yog ze rau lub ntuj zaus ntawm LC Circuit Court, ferromagnetic resonance yuav zoo siab.