1. Teeb meem posing
Kev tiv thaiv tam sim no transformer (TA) feem ntau yog siv ua ke nrog cov khoom siv tiv thaiv relay los muab lub teeb liab rau lub relay ntaus ntawv txiav tawm qhov txhaum Circuit Court thiab tiv thaiv kev nyab xeeb ntawm lub zog hluav taws xob nyob rau hauv cov xwm txheej ntawm luv Circuit Court overload lossis lwm yam txhaum. hauv kab. Nws cov kev ua haujlwm yog txawv kiag li ntawm kev ntsuas transformers, uas tsuas yog yuav tsum muaj qhov tseeb tsim nyog nyob rau hauv qhov kev ua haujlwm ib txwm muaj ntawm ib qho tam sim no. Thaum dhau los ntawm qhov yuam kev luv luv tam sim no, nws cia siab tias lub transformer yuav saturate sai li sai tau los tiv thaiv lub ntsuas ntsuas los ntawm kev puas tsuaj los ntawm qhov luv-circuit tam sim no. Tus qub tsuas yog pib ua haujlwm thaum tam sim no ob peb zaug lossis kaum tawm lub sijhawm siab dua li qub, thiab nws qhov tsis raug (tam sim no thiab theem tsis raug) yuav tsum nyob rau hauv qhov kev ua yuam kev nkhaus. Thaum ntsuam xyuas ob qho kev ua yuam kev tam sim no thiab theem sib txawv ib txhij, kev sib xyaw ua haujlwm raug siv.
Thaum cov thawj tam sim no i1 ntawm kev tiv thaiv TA me me, qhov thib ob tam sim no i2 hloov linearly; Thaum i1 nce mus rau ib theem, qhov sib nqus ntom ntom hauv cov tub ntxhais transformer yog siab heev. Vim lub nonlinearity ntawm ferromagnetic cov ntaub ntawv, lub excitation tam sim no i0 muaj cov ntsiab lus siab ntawm kev txiav txim siab harmonics, nrog ib tug taw tes waveform uas nyob deb ntawm ib tug sine yoj. Txawm hais tias il yog ib qho zoo tagnrho sine yoj, i2 tsis yog sinusoidal.
Tsis yog sinusoidal wavelets tsis tuaj yeem txheeb xyuas siv phasor daim duab thiab yuav tsum tau siv cov kev ua yuam kev sib xyaw (kev tsom xam), uas ua rau muaj kev nce sai hauv i0, sib npaug rau qee qhov i1 tsis tau hloov mus rau hauv i2, thiab i2 thiab i1 tsis muaj. ntev hloov proportionally, yog li nce TA yuam kev.
Thaum muaj kev cuam tshuam luv luv tshwm sim hauv lub zog hluav taws xob thiab ua rau muaj kev tiv thaiv kev tiv thaiv, qhov luv-circuit tam sim no kuv loj heev, feem ntau yog ntau tshaj 10 npaug ntawm qhov ntsuas tam sim no, uas ua rau muaj kev ua yuam kev thiab ua rau muaj kev phom sij thiab kev xaiv ntawm cov cuab yeej tiv thaiv.
Tsis tas li ntawd, nyob rau hauv txoj cai, TA nws tus kheej yog ib tug tshwj xeeb transformer, thiab transformers muaj qhov yuav tsum tau ua hauj lwm ntawm rated load. Yog li ntawd, yog hais tias lub load nyob rau hauv lub thib ob sab ntawm TA tshaj nws rated thib ob load tus nqi, nws kuj yuav ua rau kom nws yuam kev.
2. Cov tswv yim daws teeb meem
Raws li tau hais los saum toj no, TA qhov yuam kev yog qhov yuav tsum tau zam, thiab nws qhov loj me yog cuam tshuam nrog cov yam ntxwv ntawm TA hlau core thiab sab nraud load.
Txhawm rau tswj qhov kev ua yuam kev no, nws yog ib qho tsim nyog los tswj qhov kev sib raug zoo ntawm qhov siab tshaj plaws kuv ntawm qhov chaw ntawm TA, qhov piv ntawm qhov tam sim no mus rau qhov ntsuas i1, qhov ntsuas tam sim no, thiab qhov ntsuas thib ob. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum nkag siab meej txog cov ntsiab lus ntawm qhov raug theem thiab nws cov kev cuam tshuam qhov tseeb theem txwv, ntsuas qhov ntsuas tam sim no, thiab ntsuas qhov ntsuas. Yuav kom daws tau qhov teeb meem no, nws yog ib qho tsim nyog los xaiv qhov tsim nyog qhov tseeb raws li qhov tseeb ntawm qhov chaw substation.
Rau TA siv rau kev tiv thaiv, qib raug yog nominal raws li qhov feem pua ntawm qhov siab tshaj plaws tso cai ua yuam kev nyob rau hauv qhov ntsuas qhov tseeb txwv i1, ua raws li tsab ntawv "P" qhia txog kev tiv thaiv. Nws yog qhov tseeb manually teev qhov yuam kev theem yuav tsum tau rau TA manufacturing. Qhov tseeb txwv coefficient yog hais txog qhov piv ntawm i1max uas tuaj yeem ua tau raws li qhov yuav tsum tau ua yuam kev sib xyaw rau qhov ntsuas i1. Qhov ntsuas tam sim no yog hais txog qhov piv ntawm qhov ntsuas i1 rau i2. Qhov ntsuas load yog tus nqi thauj khoom thib ob siv los txiav txim siab qhov tseeb ntawm qhov hloov pauv.
Nyob rau hauv thawj lub teb chaws tus qauv "Tam sim no Transformer" (GBl208-75), nws tau teev tseg tias qhov tseeb ntawm TA tiv thaiv yog B thiab D. Thaum xaiv qhov raug theem ntawm TA rau kev tiv thaiv, 10% kev ua yuam kev nkhaus yuav tsum yog txheeb xyuas kom ntseeg tau tias qhov kev ua yuam kev tam sim no tsis pub dhau tus nqi teev thaum lub sijhawm luv luv. Tam sim no, tus tshiab version qhia qhov tseeb theem ntawm 5P thiab 10P, raws li, qhia txog qhov kev ua yuam kev sib xyaw ntawm 5% thiab 10% ntawm qhov ntsuas qhov raug txwv i1; Tus txheej txheem tus nqi ntawm nws qhov raug txwv coefficient suav nrog 5, 10, 15, 20, 30, thiab lwm yam, qhia tias nyob rau hauv luv luv-circuit faults, yog hais tias ntau yam ntawm luv luv Circuit Court tam sim no kuv piv rau qhov ntsuas i1 tsawg dua qhov no. tus nqi, qhov yuam kev yog tswj nyob rau hauv qhov tseeb theem ntau.
Yog li ntawd, ob qho kev txiav txim siab tuaj yeem kos: 1) Thaum xaiv qhov raug theem ntawm TA rau kev tiv thaiv, qhov raug txwv coefficient yuav tsum raug xaiv tib lub sijhawm, xws li 5P20 thiab 1200/5A, uas txhais tau hais tias thaum kuv tsis tshaj 20. lub sij hawm qhov ntsuas i1, piv txwv li tsis ntau tshaj 20 × 1200=24 kA, qhov kev ua yuam kev tsis ntau tshaj 5%; 2) Los ntawm kev xaiv ob qho kev qhia, qhov ntsuas tam sim no tuaj yeem txiav txim siab raws li qhov muab ilmax, tus nqi thauj khoom thib ob, thiab 10% yuam kev nkhaus los txiav txim qhov txwv coefficient; Qhov tseeb txwv coefficient kuj tuaj yeem raug xaiv raws li qhov muab i1max, ntsuas tam sim no piv, thiab 10% kev ua yuam kev nkhaus, thiab cov qhab nia nruab nrab thiab cov kab hluav taws xob thib ob tuaj yeem xaiv raws li 10% yuam kev nkhaus.
Thaum lub sijhawm ua haujlwm tsis tu ncua, qhov kev thauj khoom thib ob ntawm TA yuav tsum ua tau raws li qhov yuav tsum tau ua ntawm 10% kev ua yuam kev nkhaus. Ntev npaum li qhov tseeb qhov nruab nrab ntawm TA tsawg dua qhov kev tso cai los ntawm 10% kev ua yuam kev nkhaus, qhov ntsuas qhov yuam kev yuav tsum nyob rau hauv 10%. Qhov loj dua qhov thib ob load, nws yooj yim dua rau cov tub ntxhais hlau kom saturate.
