Qhov luv luv -Circuit Impedance Test yog dab tsi?
Qhov luv luv -circuit impedance test yog ib txoj hauv kev tseem ceeb hauv kev sim transformer uas pab txiav txim siab qhov sib npaug impedance thiab tooj liab poob nyob rau hauv cov xwm txheej load. Qhov kev ntsuam xyuas no yog qhov tseem ceeb rau kev ntsuas qhov kev ua haujlwm ntawm lub tshuab hluav taws xob, ua kom muaj kev nyab xeeb, thiab txheeb xyuas nws cov qauv tsim. Qhov luv luv -circuit impedance test ntsuas lub transformer series impedance (suav nrog tiv thaiv thiab reactance) los ntawm kev siv ib tug txo voltage rau ib winding thaum lwm winding yog luv-circuited. Qhov kev sim no feem ntau ua rau qhov qis-voltage sab nrog lub siab-voltage winding shorted, los yog vice versa, nyob ntawm seb muaj cov cuab yeej siv, kom tsis txhob muaj ntau dhau tam sim no lossis kev puas tsuaj.
Lub hom phiaj ntawm Short-Circuit Impedance Test yog dab tsi?
- Txiav txim siab qhov sib npaug series impedance (Zsc) ntawm transformer.
- Ntsuas qhov poob ntawm tooj liab lossis thauj khoom poob ntawm lub transformer ntawm qhov ntsuas tam sim no.
- Xam qhov voltage poob thaum lub sijhawm ua haujlwm puv -load.
- Txheeb xyuas lub transformer lub npe impedance tus nqi.
- Ntsuam xyuas lub transformer sab hauv thiab zoo.
Yuav ua li cas xam qhov luv -circuit impedance (Zsc)
Thaum kuaj, Z% tuaj yeem suav nrog:
Zpu%=(Vm * Ir) / (Vr * Im) * 100
Piv txwv
Rau lub hwj chim transformer nrog cov ntaub ntawv npe nram qab no:
yNyj 0
Rating: 90 MVA
Lub Zog: 132 / 33kV
Rated tam sim no (HV): 393.65 A
Rated tam sim no (LV): 1574.6 A
Nameplate impedance: Z%=22%
Qhov no txhais tau hais tias nyob rau hauv luv luv -circuit tej yam kev mob, rated tam sim no yuav ntws thaum 22% ntawm qhov ntsuas voltage yog siv:
Z%=Vsc / Vr * 100
Yog li ntawm HV sab:
Vsc=Z% * Vr
Nyob rau hauv -site, siv xws li ib tug high voltage yog tsis siv, yog li luv luv - Circuit Court mob yog simulated los ntawm kev siv ib tug tsawg-voltage peb-theem mov (xws li . 400 V) nyob rau sab HV thaum luv luv -circuiting LV sab.
Siv lub npe Z% thiab qhov sib npaug (1), qhov kev cia siab luv luv -circuit tam sim no nyob rau hauv cov xwm txheej no tuaj yeem kwv yees.
Hauv qhov no, ntsuas HV tam sim no thaum lub sijhawm kuaj yog kwv yees li 5 A.
Hloov qhov ntsuas tam sim no rau hauv qhov sib npaug (1), qhov xam ntawm ib qho -unit impedance yuav nyob ze rau lub npe phaj 22%, uas txheeb xyuas qhov hloov pauv impedance.
Nco ntsoov tias qhov kev piav qhia no yog qhov tseeb, thiab muaj cov ntsiab lus ntxiv txog qhov kev xeem uas tsis suav nrog.