Nyob rau hauv peb theem plaub hlau system, yog hais tias tag nrho symmetrical peb-theem load (yog hais tias impedance daim duab peb sab yog congruent daim duab peb sab los piav qhia qhov xwm ntawm impedance thiab tib qhov loj), xoom kab dispensable, piv txwv li tag nrho symmetrical, peb-theem asynchronous lub cev muaj zog , peb-theem winding kev twb kev txuas mus rau hauv lub hnub qub, txawm nyob rau hauv lub tsis muaj lub xoom kab, kuj yuav tau txais peb-theem symmetrical peb-theem winding voltage, hluav taws xob muaj nuj nqi ua hauj lwm li niaj zaus.
Tab sis rau cov tsev kawm ntawv, cov tsev, khw muag khoom thiab cov koom haum mus rau ib theem kev thauj khoom - raws li cov neeg siv, xoom kab tau ua lub luag haujlwm tseem ceeb. Txawm hais tias kev tsim thiab kev teeb tsa ntawm cov khoom siv hluav taws xob hauv cov chaw no yuav tsum ua rau ob-theem thauj khoom ze rau qhov sib npaug kom deb li deb tau, tab sis qhov tsis txaus ntseeg no yog qhov tseeb, qhov sib npaug tsuas yog txheeb ze, thiab hloov txhua lub sijhawm.
Hauv qhov no, yog tias txoj kab xoom cuam tshuam, qhov nruab nrab ntawm qhov muaj peev xwm ntawm peb-theem load yuav hloov. Cov txiaj ntsig ncaj qha ntawm qhov nruab nrab ntawm qhov muaj peev xwm hloov chaw yog qhov tsis txaus ntseeg peb-theem voltage, qee theem voltage yuav zoo heev tshaj qhov ntsuas hluav taws xob ntawm cov khoom siv hluav taws xob (hauv qhov xwm txheej hnyav yuav ze rau 380V), lub teeb yuav hlawv cov khoom siv hluav taws xob, hnyav yuav ua rau hluav taws kub thiab lwm yam. xwm txheej loj; Thiab qee qhov hluav taws xob theem qis dua qhov ntsuas hluav taws xob ntawm cov khoom siv hluav taws xob (hauv qhov xwm txheej hnyav yuav nyob ze rau 0V), lub teeb yuav ua rau cov khoom siv hluav taws xob tsis tuaj yeem ua haujlwm, hnyav tseem yuav hlawv cov khoom siv hluav taws xob (vim tias qhov hluav taws xob tsawg dhau, cua txias, tshuab ntxhua khaub ncaws thiab khoom siv tub yees hauv lub cev muaj zog tsis tuaj yeem pib, yuav kub hnyiab tau ntev). Txij li thaum peb-theem load hloov randomly, yog li qhov voltage imbalance.
Tsis tas li ntawd, yog tias qee cov khoom siv hluav taws xob siv xoom tiv thaiv (lub plhaub txuas nrog xoom kab), xoom kab cuam tshuam, yuav poob xoom tiv thaiv, tej zaum yuav muaj hluav taws xob poob siab. Yog li cov kab xoom yog qhov tseem ceeb heev hauv peb - theem plaub - xaim system.
Yog li ntawd, txoj kab xoom yog xaiv tau rau peb-theem hluav taws xob uas nws vector sum yog xoom txhua lub sijhawm. Tab sis nyob rau hauv peb-theem plaub-xaim fais fab mov system, vim hais tias ntawm lub hav zoov ntawm ob qhov sib txawv voltages, kab voltage (380V) thiab theem voltage (220V), yog li nws yog tsis yooj yim sua kom ua tiav lub meej symmetry ntawm peb-theem load, uas. yog tus xoom kab plays lub luag haujlwm tseem ceeb.