Daim duab 1
1. Harmonic Excitation Currents: Nyob rau hauv Dyn11-configured transformers, 3rd harmonic excitation currents (qhov twg n yog ib tug zoo integer) circulate nyob rau hauv lub thawj winding txuam nrog cov kev twb kev txuas D, yog li tiv thaiv lawv txhaj rau hauv lub siab-voltage. daim phiaj. Cov yam ntxwv no muaj txiaj ntsig zoo dua hauv kev ua kom muaj kev sib haum xeeb siab dua piv rau cov transformers nrog thawj windings txuas hauv Yyn0 configuration.
2. Zero-Sequence Impedance: Zero-sequence impedance ntawm Dyn11-configured transformers yog ho qis dua li ntawm Yyn0-configured transformers. Cov yam ntxwv no yog qhov zoo rau kev tshem tawm ib theem hauv av txhaum ntawm sab qis-voltage.
3. Ib Theem Ib Theem Unbalanced Loads: Dyn11-configured transformers muaj peev xwm ntau dua nyob rau hauv tuav ib-theem unbalanced loads piv rau Yyno-configured transformers. Rau Yyn0-configured transformers, qhov nruab nrab tam sim no feem ntau tsis pub tshaj 25% ntawm cov ntsuas tam sim no ntawm lawv cov low-voltage windings, whereas Dyn11-configured transformers tuaj yeem zam qhov nruab nrab tam sim no tshaj 75% ntawm lawv. low-voltage winding qhov ntsuas tam sim no.
Hauv cov ntsiab lus, Dyn11 vector pawg transformers ua tau zoo hauv kev txwv qhov kev sib haum xeeb thib peb thiab txo qis qis-ib ntu impedance, yog li nce qhov loj ntawm ib theem hauv av txhaum tam sim no. Qhov no yog qhov tseem ceeb heev rau kev txhim kho qhov rhiab heev ntawm Circuit Court breakers rau ib-theem hauv av txhaum kev ua haujlwm.
[1] Daim duab 1 , IEC 60076-1 © IEC:1993+A1:1999 – 47 –