Kev tiv thaiv tam sim no transformer yog tam sim no transformer tshwj xeeb tsim los muab cov cim tam sim no raug rau kev tiv thaiv relays thaum muaj xwm txheej. Tsis zoo li metering CTs, uas yog qhov tseem ceeb ntawm qhov tseeb ntawm cov khoom thauj tam sim no, kev tiv thaiv CTs yog tsim los tswj cov teeb liab kev ncaj ncees thiab linearity ntawm cov tam sim no siab heev -feem ntau ntau zaus cov ntsuas thawj tam sim no -kom ntseeg tau tias kev tiv thaiv relays tuaj yeem ntseeg tau thiab teb rau qhov tsis raug.
Lub ntsiab lus ntawm kev tiv thaiv CT yog nws lub peev xwm kom nyob twj ywm thiab muaj tseeb thaum lub sijhawm ua txhaum. Thaum lub caij luv luv lossis hauv av txhaum tshwm sim, thawj qhov tam sim no tuaj yeem nce mus rau 10, 20, lossis txawm tias 40 npaug ntawm qhov ntsuas tam sim no. Kev tiv thaiv CT yuav tsum muaj peev xwm rov tsim dua qhov kev ua txhaum tam sim no ncaj ncees nyob rau hauv lub voj voog thib ob kom cov kev tiv thaiv relay tuaj yeem txiav txim siab seb puas yuav mus rau lub Circuit Court breaker. Yog hais tias CT saturates ntxov ntxov, qhov thib ob tam sim no yuav distorted, thiab relay yuav tsis ua hauj lwm los yog tej zaum yuav ua hauj lwm tsis raug.
Kev tiv thaiv CTs raug cais los ntawm cov chav kawm raug xws li 5P, 10P, thiab lawv qhov txawv, qhov "P" sawv cev rau kev tiv thaiv. Ib qho kev xaiv zoo li 5P20 qhia tias CT muaj qhov yuam kev ntau tshaj plaws ntawm 5% ntawm 20 npaug ntawm qhov ntsuas thawj tam sim no. Cov chav kawm raug muaj xws li 5P10, 5P20, 5P30, 10P10, thiab 10P20. Thawj tus lej sawv cev rau qhov feem pua ua yuam kev ntau tshaj plaws ntawm qhov raug txwv thawj zaug tam sim no, thiab tus lej thib ob sawv cev rau qhov raug txwv qhov tseeb -qhov ntau ntawm cov ntsuas tam sim no uas tau lees paub qhov tseeb.
Kev tiv thaiv CTs yog siv nyob rau hauv ntau yam kev tiv thaiv relaying schemes, nrog rau kev tiv thaiv overcurrent, kev tiv thaiv sib txawv, kev tiv thaiv nyob deb, thiab tiv thaiv lub ntiaj teb txhaum. Lawv muaj nyob rau hauv switchgear, lub chaw tswj lub cev muaj zog, substations, thiab muaj hwj chim systems nyob qhov twg cov kev tiv thaiv relays yog siv los mus ntes thiab cais faults. Kev ntseeg tau ntawm tag nrho cov txheej txheem tiv thaiv yog nyob ntawm CT lub peev xwm los muab cov ntaub ntawv raug tam sim no thaum muaj teeb meem txhaum cai.
Thaum xaiv ib qho kev tiv thaiv CT, engineers yuav tsum xav txog qhov siab tshaj plaws tam sim no uas lub kaw lus tuaj yeem xa thiab xaiv CT nrog qhov raug txwv tsis pub txaus los npog qhov tam sim no. Lub CT lub nra yuav tsum tau muab tso rau hauv kev sib txuas nrog relay thiab xaim kom ntseeg tau tias kev ua tau zoo. Tsis tas li ntawd, CT yuav tsum muaj peev xwm tiv taus cov thermal thiab mechanical stresses ntawm txhaum tam sim no yam tsis muaj kev puas tsuaj. Rau cov phiaj xwm kev tiv thaiv sib txawv, cov yam ntxwv sib luag CT yog qhov tseem ceeb los xyuas kom meej tias cov kev tiv thaiv relay tsis ua haujlwm ntawm qhov tsis sib xws tam sim no.
Hauv cov ntsiab lus, kev tiv thaiv tam sim no transformer yog ib qho tseem ceeb hauv kev tiv thaiv hluav taws xob. Nws muaj peev xwm tswj tau qhov tseeb thiab linearity thaum lub sij hawm siab - tam sim no qhov teeb meem yog qhov tseem ceeb rau kev ua haujlwm txhim khu kev qha ntawm kev tiv thaiv relays thiab kev nyab xeeb ntawm cov hluav taws xob.