Chav Kawm Qhov Tseeb ntawm CTs: Tshawb Nrhiav Kev Ntsuas thiab Kev Ntsuas Cov Qauv
Tam sim no transformers (CTs) yog cov khoom tseem ceeb hauv kev tiv thaiv hluav taws xob thiab kev saib xyuas. Lawv yog lub luag hauj lwm rau muab ib tug proportional tam sim no tso zis rau cov kev tiv thaiv relays, ua rau nws muaj peev xwm mus ntes tej yam txhaum los yog txawv txav nyob rau hauv lub hwj chim system. Txawm li cas los xij, qhov tseeb ntawm CTs yog qhov tseem ceeb los xyuas kom meej tias kev ua haujlwm raug ntawm kev tiv thaiv relays.
CT qhov tseeb yog txiav txim los ntawm nws cov ntaub ntawv pov thawj qhov tseeb uas raug ntaus rau ntawm daim ntawv teev npe. Piv txwv li, CT qhov tseeb chav kawm ntawm 0.3 txhais tau tias CT yog
certified kom muaj tseeb nyob rau hauv 0.3% ntawm nws rated piv tus nqi rau ib tug thawj tam sim no ntawm 100 feem pua ntawm cov rated ratio.
CT nrog qhov ntsuas qhov sib piv ntawm 200/ 5 nrog chav kawm raug ntawm 0.3 yuav ua haujlwm li ntawm 0.45% ntawm nws qhov ntsuas tus nqi piv rau thawj qhov tam sim no ntawm
100 amps piv txwv li rau thawj qhov tam sim no ntawm 100A nws tau lees paub los tsim cov tam sim no theem nrab ntawm 2.489 amps thiab 2.511 amps.
Qhov tseeb yog teev raws li % hnub nyoog ntawm ntau yam thiab muab rau lub nra hnyav tshaj plaws raws li tau hais hauv VA. Tag nrho lub nra muaj xws li cov tswv yim tiv thaiv ntawm lub 'meter' thiab lub voj tsis kam ntawm cov hlau thiab kev sib txuas ntawm CT thiab lub 'meter'. Piv txwv: Burden {{0}} 0 VA. Qhov siab tshaj qhov poob siab=2.0 VA / 5 Amps=0.400 Volts.
Maximum Resistance=Voltage / Tam sim no=04 00 Volts / 5 Amps=0.080 Ohms.
Yog hais tias input tsis kam ntawm 'meter' yog {{0}}.010Ω, ces 0.070Ω tso cai rau lub voj tsis kam ntawm cov hlau, thiab kev sib txuas ntawm CT thiab meter.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov tseeb ntawm CTs tuaj yeem cuam tshuam los ntawm ntau yam, xws li CT qhov kub thiab txias, qhov zaus ntawm cov khoom siv tam sim no, thiab qhov zoo ntawm cov rwb thaiv tsev winding. Yog li ntawd, calibration tsis tu ncua thiab kev saib xyuas ntawm CTs yog tsim nyog los xyuas kom meej lawv qhov tseeb.
