Dab tsi yog CT thiab PT hauv Substation?
Hav, yog tias koj tau taug kev ncig ib puag ncig lub chaw nres tsheb lossis ua haujlwm hauv lub tshuab hluav taws xob, tej zaum koj tau pom cov qhov siab, insulator - saib tej yam thiab xav tsis thoob tias lawv ua dab tsi tiag. Zoo, ob qho tseem ceeb tshaj plaws yogCT(Tam sim no Transformer) thiabPT(Tej zaum Transformer - tej zaum tib neeg tsuas yog hu nws VT rau Voltage Transformer). Lawv yog cov "qhov muag thiab pob ntseg" ntawm tag nrho cov teeb.
Cov cuab yeej hloov pauv no coj cov vwm - cov tam sim no siab thiab qhov hluav taws xob khiav los ntawm thawj sab - peb tab tom tham txog ntau txhiab amps thiab ntau pua kilovolts - thiab nqis mus rau kev nyab xeeb, qib txheem (xws li 5 A lossis 110 V) kom cov meters, relays, thiab tswj iav tuaj yeem siv cov teeb liab tiag tiag tsis muaj leej twg tau kib lossis cov khoom siv tshuab.
Yog tsis muaj lawv, koj yuav tsis muaj kev nyab xeeb txuas mus rau ib lub 'meter' lossis kev tiv thaiv relay mus rau qhov siab -voltage kab. Nws tsuas yog yuav tsis ua tau ... lossis muaj sia nyob.
1. Yog li, Dab tsi yog Tam Sim No Transformer (CT)?
A CT yog qhov yooj yim zoo nkauj: nws rub lub hauv paus loj tam sim no ntws los ntawm txoj kab hluav taws xob thiab hloov mus rau hauv qhov me me tam sim no - feem ntau yog 1 A lossis 5 A - thaum ua kom siab -voltage sab cais tawm ntawm qhov qis -voltage sab.
Nov yog yam tseem ceeb uas yuav tsum paub:
Nws ib txwm txuas nroghauv series- qhov tam sim no yuav tsum ntws ncaj qha los ntawm nws (feem ntau tus neeg xyuas pib tsuas yog hla ncaj qha los ntawm cov tub ntxhais, yog li thawj zaug yog ib qho tig).
Secondary yog tus qauv: 1 A lossis 5 A.
Piv txwv piv txwv: 2000/5 - lub ntsiab lus 2000 amps thawj muab rau koj 5 amps ntawm theem nrab.
Vim li cas peb xav tau: pub cov ntawv nyeem tam sim no rau lub zog ntsuas hluav taws xob, pab tiv thaiv relays pom qhov tsis raug (overcurrent, sib txawv tiv thaiv, kev ncua deb, koj lub npe), thiab txhawb nqa cov ntaub ntawv tsis raug thiab saib xyuas.
Super ceeb toom kev nyab xeeb: Tsis txhob - puas tau - tawm sab nraud ntawm CT nyob qhib-circuited. Nws tuaj yeem tsim tau ntau txhiab volts thoob plaws cov chaw qhib, ua rau arcing, rwb thaiv tsev tawg, lossis tseem ua rau cov khoom tawg. Cov khoom loj.
2. Thiab Yuav Ua Li Cas Txog Lub Taub Hau Hloov Pauv (PT / VT)?
PT ua haujlwm tib yam tab sis rau qhov hluav taws xob. Nws siv lub zog hluav taws xob siab (11 kV, 110 kV, 220 kV, txawm li cas los xij) thiab xa nws mus rau qee yam kev nyab xeeb xws li 110 V kab - mus rau - kab lossis txog 63.5 V theem - mus rau - nruab nrab.
Quick rundown:
Txuas nrognyob rau hauv parallel- hla cov theem lossis theem - mus rau - hauv av.
Thawj qhov sib tw ntawm kab voltage; theem nrab feem ntau yog 110 V / 100 V kab lossis 63.5 V / 57.7 V theem.
Piv txwv: 110000 / 100 - 110 kV thawj → 100 V theem nrab.
Siv rau: voltage metering, synchro-xyuas ua ntej kaw breakers, over/under{1}}voltage protection, power quality khoom.
Daim ntawv ceeb toom kev nyab xeeb ntawm no: Tsis txhob luv qhov nruab nrab ntawm PT thaum nws muaj zog - koj yuav tau txais tam sim no loj heev, overheating, thiab tej zaum yuav haus luam yeeb lossis hluav taws.
3. Sab nrawm-los ntawm-Side: CT vs PT
Nov yog qhov sib piv yooj yim kom nws ncaj:
| Feature | CT (Tam sim no Transformer) | PT / VT (Tshwj xeeb Transformer) |
|---|---|---|
| Qhov nws ntsuas | Tam sim no | Qhov hluav taws xob |
| Nws txuas li cas | Hauv series (tam sim no ntws los ntawm) | Nyob rau hauv parallel (thov kab) |
| Hom thib ob | 1 A los yog 5 A | 110V, 100V, lossis ~ 63.5V |
| Zoo kawg os... | Secondary yog sab laug qhib → high voltage | Secondary yog luv → loj tam sim no |
| Saturation nyhuv | Messes tiv thaiv raug | Distors qhov voltage waveform |
| Cov chav kawm raug | Kev ntsuas: 0.2S, 0.5S Kev Tiv Thaiv: 5P10, 5P20, PS | Metering: 0.2, 0.5 Kev Tiv Thaiv: 3P, 6P |
| Cov qauv tsim | Qhov txhab, bar, qhov rais, bushing | Electromagnetic los yog Capacitive (CVT rau siab dua voltages) |
Rau txhua yam 110 kV thiab nce, koj yuav pom ntau heevCVTs(Capacitor Voltage Transformers) tsis tu ncua PTs - lawv pheej yig dua thiab tuav cov rwb thaiv tsev zoo dua hauv super- siab -voltage setups.
4. Koj Puas Pom Lawv Nyob Qhov Twg?
CTs pop tuaj zoo nkauj txhua qhov chaw tam sim no xav tau ntsuas: ntawm Circuit Court breakers, ntawm txhua sab ntawm transformers, busbars, feeders, capacitor banks, koj tau txais lub tswv yim.
PTs (los yog CVTs) nyiam zaum ntawm cov tsheb npav, cov kab nkag / tawm, lossis siab -voltage sab ntawm lub ntsiab transformer.
Wrapping It Up
Cov kab hauv qab: CTs muaj kev nyab xeeb txo qis cov dej ntws loj kom peb tuaj yeem ntsuas thiab tiv thaiv kom raug. PTs ua tib yam rau qhov txaus ntshai -high voltages. Ua ke, lawv cia lub substation khiav metering kom raug, khaws kev tiv thaiv txhim khu kev qha, tso cai rau kev nyab xeeb, thiab ua kom synchronization ua tau - tag nrho yam tsis tau nthuav tawm tib neeg lossis iav rau qib tuag.
Yog tias koj xav nkag mus tob rau hauv tej yam xws li cov chav kawm raug, yuav ua li cas xam lub nra, kuaj cov txheej txheem, lossis txawm tias cov kab kos, cia li qhia rau kuv paub - zoo siab mus rau qhov ntawd!
