Txhawm rau kom paub meej tias lub cev thiab cov yam ntxwv hluav taws xob ntawm qhov tam sim no transformer ntsia hauv lub installation. Xyuas kom lub CT txuas nrog lub kaw lus kom zoo nyob rau hauv txhua yam (thawj thiab theem nrab).
TSEEM CEEB:
Rwb thaiv tsev tester
Polarity tester
Digital low ohmmeter
Tam sim no qhov chaw, multimeter
Variac, kauj ruam-up transformer (0-2kv)
Thawj qhov kev txhaj tshuaj tam sim no
INSULATION RESISTANCE TEST:
Qhov voltage yuav tsum tau siv nruab nrab ntawm
- Pem hauv ntej mus rau theem nrab ntxiv hauv av (them thaum lub sij hawm hloov pauv hloov).
- Secondary rau lub hauv paus ntxiv rau hauv av.
- Secondary core mus rau core.
.
POLARITY TEST:
Kev xeem polarity yog kom paub meej tias cov cim polarity ntawm CT thawj thiab theem nrab thiab xyuas kom meej tias nws yog txuam nrog kev kos duab. Ntau dua puas tau muab ib lub tswv yim, yuav ua li cas txuas cov neeg thib ob los ua kev tiv thaiv (xws li kev taw qhia, qhov sib txawv)
thiab metering ua haujlwm kom raug.
Cais CT thib ob los ntawm kev thauj khoom thiab ua ib qho kev sib txuas hauv Circuit Court raws li qhia hauv Kaw thiab qhib lub roj teeb hloov txuas rau ntawm thawj. Saib lub pointer txav +ve kev taw qhia thaum kaw thiab -ve kev taw qhia thaum qhib rau qhov tseeb polarity.
BURDEN TEST: (YOG TEST)
Kev ntsuas lub nra hnyav yog txhawm rau xyuas kom lub nra txuas nrog CT nyob rau hauv lub nra hnyav, txheeb xyuas ntawm daim ntawv teev npe. Txhaj cov ntsuas theem nrab tam sim no ntawm CT, los ntawm CT terminals mus rau sab load los ntawm kev cais cov CT theem nrab nrog tag nrho cov kev txuas txuas thiab saib xyuas qhov hluav taws xob poob hla cov ntsiab lus txhaj tshuaj. Lub nra VA tuaj yeem xam raws li, Burden VA=Voltage drop x rated CT sec. Tam sim no. txwv:
Lub nra hnyav yuav tsum tsawg dua tus nqi CT lub nra.
Lus Cim: Lub ammeter selector hloov yuav tsum nyob rau theem ntawm qhov kev xeem. High-impedance relays yuav tsum luv luv thaum lub sij hawm xeem.
MAGNETIZATION CURVE TEST: (Yeem TEST)
Mag. Curve test yog kom paub meej tias cov yam ntxwv magnetization ntawm CT nrog cov ntawv teev npe.
Qhov kev ntsuam xyuas no yuav tsum tau ua ua ntej qhov ntsuas qhov sib piv thiab tom qab qhov kev ntsuam xyuas theem nrab thiab cov polarity, vim cov hlau nplaum seem tshuav nyob hauv cov tub ntxhais vim qhov kev xeem DC (polarity, tsis kam), uas ua rau muaj qhov yuam kev ntxiv hauv qhov kev xeem piv. Cov ntsuas siv rau qhov ntsuas no yuav tsum muaj qhov ntsuas RMS tiag.
Kev sib txuas hauv Circuit Court yuav tsum tau ua raws li qhia Lub hauv paus yuav tsum qhib thaum lub sijhawm kuaj.
Demagnetization:
Ua ntej pib qhov kev ntsuam xyuas demagnetize cov tub ntxhais los ntawm Txhaj voltage ntawm cov terminals theem nrab thiab nce mus txog qhov twg muaj kev nce ntxiv hauv tam sim no nrog rau qhov me me voltage increment. Tam sim no pib txo qhov voltage mus rau xoom, tus nqi ntawm qhov nce.
Kev xeem Magnetization:
Tam sim no nce qhov voltage thiab saib xyuas qhov excitation tam sim no mus txog rau CT mus txog ze qhov chaw saturation. Sau qhov kev nyeem ntawv ntawm voltage thiab tam sim no
ntawm ob peb lub ntsiab lus. Npaj qhov nkhaus thiab ntsuas Vk thiab Img los ntawm daim duab.
TURNS RATIO TEST: (Yeem)
Qhov kev sim no yog los xyuas kom meej qhov sib piv ntawm CT ntawm txhua tus kais dej. Kev sib txuas hauv Circuit Court yuav tsum ua raws li qhia hauv daim duab 6.4. Thawj qhov tam sim no ntawm qhov tsawg kawg nkaus ntawm 25% qhov ntsuas thawj tam sim no yuav tsum tau txhaj rau thawj sab ntawm CT nrog cov theem nrab luv luv thiab qhov thib ob tam sim no tuaj yeem ntsuas & kaw rau txhua qhov cores. Txwv: Qhov tau txais qhov sib piv yuav tsum sib phim nrog cov ntawv teev npe piv.
PRIMARY INJECTION TEST:
Qhov kev ntsuam xyuas no yog los xyuas kom meej cov CT circuits raug txuas nrog cov cores uas muaj kev hwm thiab tsis muaj kev sib xyaw ua ke hauv Circuit Court (theem kev txheeb xyuas).
kev sib txuas yuav tsum tau ua raws li qhia hauv daim duab 6.4. Ib qho taw qhia hauv av yuav tsum raug txheeb xyuas rau CT circuits, ua ntej pib qhov kev xeem no.
Txhaj 25% ntawm qhov ntsuas thawj tam sim no ntawm ib theem thiab lub ntiaj teb nrog tag nrho cov khoom sib txuas. Ntsuas theem nrab tam sim no ntawm txhua lub ntsiab lus ntawm CT circuits. Nws yuav tsum ua rau lwm theem.