Qhov sib txawv zaus transformer tester yog cov cuab yeej ntsuas qib siab uas siv cov cuab yeej siv hluav taws xob sib txawv thiab cov teeb liab ua cov thev naus laus zis. Los ntawm kev hloov qhov zaus ntawm qhov ntsuas hluav taws xob (feem ntau kho tau nyob rau hauv thaj tsam ntawm 1Hz - 200Hz, nrog 40Hz - 70}Hz yog qhov feem ntau siv), nws ntsuas qhov tseem ceeb tsis xws li qhov sib txawv ntawm qhov sib txawv (kev sib txawv), theem sib txawv (lub kaum sib txawv), excitation yam ntxwv nkhaus, volt -ampere nkhaus yam ntxwv, thiab error kev hloov pauv theem nrab. rau ntawm - qhov chaw sim.
Vim li cas "variable zaus" xav tau? Lub hauv paus ntsiab lus tseem ceeb thiab qhov zoo ntawm qhov sib txawv zaus transformer tester
Txoj kev kuaj ib txwm siv rau transformers siv AC fais fab mov (50/60Hz). Txawm li cas los xij, thaum kuaj loj - muaj peev xwm thiab siab -voltage-theem transformers (tshwj xeeb tshaj yog tiv thaiv CTs) ntawm -site, muaj ob qhov teeb meem loj:
Lub zog muaj peev xwm loj: txhawm rau kuaj cov yam ntxwv ntawm kev ua kom muaj zog, yuav tsum muaj qhov hluav taws xob siab. Yog tias siv 50Hz fais fab mov, cov khoom siv hluav taws xob (voltage regulator, booster) xav tau yuav loj heev thiab tsis tuaj yeem nqa mus rau qhov chaw.
Core saturation: Nyob rau hauv lub zog zaus, cov tub ntxhais yog nquag nkag mus rau qhov chaw saturation, ua rau nws nyuaj rau kev ntsuas tus yam ntxwv nkhaus ua ntej qhov saturation point.
Kev daws raws li kev siv tshuab hloov zaus:
Raws li txoj cai ntawm electromagnetic induction, induced electromotive force E=4.44fNBmS. Raws li qhov xwm txheej uas qhov sib nqus flux ntom ntom Bm tseem nyob tas li, qhov voltage yog ncaj qha proportional rau zaus. Yog li ntawd:
Txo qhov zaus (piv txwv li, mus rau 45 Hz), qhov yuav tsum tau ntsuas qhov ntsuas hluav taws xob rau kev tsim tib lub sib nqus flux kuj yuav txo tau raws li. Qhov no txhais tau hais tias cov khoom siv hluav taws xob me me thiab sib zog tuaj yeem siv los ua kom yooj yim tsim kom muaj qhov ntsuas hluav taws xob txaus txaus ntawm - qhov chaw kom tau txais qhov ua tiav qhov nkhaus mus txog saturation.
Qhov no yog nws qhov tseem ceeb tshaj plaws kom zoo dua: "kev txo qis thiab kev txhawb nqa hluav taws xob", uas ua rau lub cuab yeej txav tau yooj yim thiab ua kom muaj txiaj ntsig zoo.
Lub luag haujlwm tseem ceeb ntawm cov zaus hloov pauv hloov pauv hloov pauv tester
Excitation (volt{0}}ampere) yam ntxwv kuaj:
Qhov no yog qhov tseem ceeb tshaj plaws rau kev tiv thaiv CTs. Los ntawm kev ntsuas thiab teeb tsa qhov voltage-tam sim no nkhaus ntawm qhov thib ob windings, nws muaj peev xwm xam:
Tig point voltage (saturation point): Qhov no yog qhov tseem ceeb rau kev txiav txim siab seb CT puas ua tau raws li 10% lossis 5% yuam kev nkhaus.
Qhov Tseeb Limiting Factor (ALF): Ntsuam xyuas seb CT puas tuaj yeem xa cov teeb liab tau raug thaum lub sijhawm luv luv -circuit txhaum yam tsis muaj saturation.
Secondary txwv voltage: Txheeb xyuas seb qhov kev ua tau zoo ntawm CT puas ua tau raws li qhov yuav tsum tau muaj ntawm kev tiv thaiv.
Kev ntsuas qhov sib piv thiab polarity:
Tsis siv neeg ntsuas qhov hloov pauv qhov tseeb thiab sib piv nrog daim ntawv teev npe.
Xyuas seb qhov polarity puas yog (tsis zoo polarity lossis polarity zoo).
Qhov sib txawv thiab qhov sib txawv ntawm qhov ntsuas:
Qhov no yog qhov kev xeem tseem ceeb rau kev ntsuas ntawm CT / PT. Nws ntsuas qhov kev ua yuam kev sib piv thiab theem kev ua yuam kev ntawm qhov tseeb thib ob tam sim no / qhov hluav taws xob thiab tus nqi zoo tagnrho, thiab txiav txim siab seb nws puas ua tau raws li qhov tseeb xws li 0.2S, 0.5, 5P, thiab 10P.
Cia li xam thiab npaj 10% yuam kev nkhaus:
Cov cuab yeej tuaj yeem suav thiab kos 10% kev ua yuam kev nkhaus ntawm CT raws li cov ntaub ntawv excitation yam ntxwv, thiab ncaj qha txiav txim seb qhov yuam kev ntawm CT tshaj tus qauv nyob rau hauv ntau yam luv luv - Circuit Court tam sim no.
Kev ntsuas ntawm DC tsis kam ntawm theem nrab winding:
Tshawb xyuas qhov kev sib txuas zoo ntawm cov xov hlau winding, nrog rau cov xov hlau tawg lossis inter-tig luv circuits.
Demagnetization muaj nuj nqi:
Tom qab kev sim lossis thaum muaj kev ua haujlwm tsis zoo, CT core tuaj yeem khaws cov hlau nplaum seem, uas tuaj yeem cuam tshuam kev ua haujlwm. Qhov ntsuas tau tuaj yeem ua demagnetization.
Load (impedance) xeem:
Ntsuas qhov tseeb load ntawm qhov thib ob Circuit Court ntawm lub transformer, thiab txiav txim seb nws tshaj nws rated load.
Daim ntawv thov scenarios ntawm zaus hloov pauv transformer tester
Relay tiv thaiv kev lees paub thiab pov thawj:
Xyuas seb lub ncov voltage thiab 10% yuam kev nkhaus ntawm lub tshiab ntsia los yog overhauled tiv thaiv CT ua tau raws li qhov yuav tsum tau ntawm kev sib txawv tiv thaiv, overcurrent tiv thaiv, thiab lwm yam ntawm cov kab los yog lub ntsiab transformer.
Kev ntsuas ntsuas:
Ua qhov piv txwv thiab theem sib txawv ntawm CT / PT siv rau kev ntsuas ntawm lub 关口 lossis rau lub hom phiaj tseem ceeb ntawm kev them nqi, kom ntseeg tau tias muaj kev ncaj ncees thiab raug ntawm kev lag luam kev sib haum xeeb.
Kev kuaj tiv thaiv:
Tsis tu ncua xyuas cov yam ntxwv hloov pauv ntawm kev khiav hauj lwm transformers los tiv thaiv kev tiv thaiv maloperation los yog tsis ua hauj lwm vim CT saturation.
Fault Diagnosis:
Thaum muaj kev tiv thaiv malfunction tshwm sim, xyuas seb qhov kev ua tau zoo ntawm cov CT cuam tshuam puas tau los yog ua kom txaus.
Engineering commissioning thiab xa mus: Cov khoom tseem ceeb rau kev sim rau cov chaw tshiab lossis kho dua tshiab.
