Dielectric absorption xeem
Hauv kev sim dielectric-absorption, ib qho hluav taws xob muab los ntawm qhov chaw muaj peev xwm tsis tu ncua yog siv thoob plaws lub rwb thaiv tsev. Qhov ntsuas hluav taws xob siv tau yuav tsum tau kos npe yog tias siab dua qhov kev ntsuas hluav taws xob tiv thaiv kom tau txais kev ntsuas tam sim no. Qhov chaw muaj peev xwm tuaj yeem yog meg-ohmmeter, raws li tau piav qhia saum toj no, lossis lub zog hluav taws xob siab nrog lub ammeter qhia tias tam sim no raug kos los ntawm cov qauv hauv qab kev sim. Qhov hluav taws xob yog siv rau lub sijhawm ncua sijhawm, los ntawm 5 mus rau 15 feeb, thiab cov ntawv nyeem ib ntus raug coj los ntawm cov rwb thaiv tsev los yog cov dej xau tam sim no.
Cov ntaub ntawv ntsuam xyuas raug soj ntsuam los ntawm lub hauv paus hais tias yog tias rwb thaiv tsev nyob rau hauv qhov zoo, nws qhov kev pom tseeb ntawm kev rwb thaiv tsev yuav nce ntxiv thaum qhov kev ntsuam xyuas nce. Tsis zoo li kev ntsuas hluav taws xob tiv thaiv hluav taws xob, qhov ntsuas qhov ntsuas dielectric absorption yog ywj siab ntawm qhov ntim thiab qhov ntsuas kub ntawm rwb thaiv tsev nyob rau hauv kev sim. Rau qhov kev ntsuam xyuas dielectric absorption, cov txiaj ntsig tau sau tseg ntawm txhua lub sijhawm ib feeb yog npaj rau ntawm daim ntawv teev npe nrog cov kev sib koom ua ke rau kev tawm tsam piv rau lub sijhawm. Txoj kab nqes ntawm qhov tshwm sim nkhaus muab ib qho kev qhia zoo ntawm kev rwb thaiv tsev. Ib qho kev rwb thaiv tsev zoo yuav muaj txoj kab nqes uas yog txoj kab ncaj nraim nce nrog rau lub sijhawm. Cov yam ntxwv txoj kab nqes ntawm ib qho kev rwb thaiv tsev tsis zoo yuav yog qhov nkhaus uas flattens tawm nrog rau lub sijhawm.
Kev ntsuas polarization index
Lub polarization Performance index yog ib daim ntawv thov tshwj xeeb ntawm dielectric absorption test. Qhov Performance index yog qhov piv ntawm rwb thaiv tsev tiv thaiv ntawm ob lub sij hawm sib txawv tom qab daim ntawv thov voltage, feem ntau cov rwb thaiv tsev tsis kam ntawm 10 feeb rau cov rwb thaiv tsev ntawm 1 feeb. Kev siv cov kev ntsuas polarization-index feem ntau yog nyob rau hauv lub tshuab tig, cables, thiab transformers. Ib qho polarization Performance index tsawg dua 1.0 qhia
tias cov cuab yeej xav tau kev saib xyuas ua ntej muab tso rau hauv kev pabcuam. Cov ntaub ntawv muaj nyob rau hauv polarization indexes rau ntau yam khoom siv nrog rau hauv cov lus 1-2. Kev lees txais kev kuaj xyuas tshwj xeeb rau Cov Hluav Taws Xob Hluav Taws Xob thiab Cov Khoom Siv Hluav Taws Xob thiab Cov Txheej Txheem NETA 1999 thiab Kev Pom Zoo rau Kev Ntsuas Hluav Taws Xob Hluav Taws Xob ntawm Rotating Machinery (IEEE Std. 43-2000) yog cov ntaub ntawv muaj nyob rau hauv polarization indexes rau ntau hom khoom siv. Qhov ntsuas polarization ntsuas yuav kav ntev li 10 feeb. Cov rwb thaiv tsev tiv thaiv tau kaw tom qab 1 feeb, tom qab ntawd rov qab 10 feeb. Lub polarization Performance index yog qhov quotient ntawm 10-feeb thiab 1-feeb nyeem ntawv raws li qhia hauv kab zauv hauv qab no:
PI=RIO/R, (dimensionless) Qhov twg:
PI=polarization index
R=tsis kam.
Rau polarization indexes nyob rau hauv transformers, tus nqi txais yuav yog 2 los yog siab dua, qhov tseem ceeb ntawm 2 thiab 1 qhia tau hais tias marginal mob, thiab qhov tseem ceeb hauv qab 1 qhia qhov tsis zoo. Tom qab kev nyeem ntawv rwb thaiv tsev tiv thaiv tau ua tiav, qhov ntsuas qhov ntsuas hluav taws xob rov qab mus rau xoom thiab cov rwb thaiv tsev raug tso tawm.