Tam sim no transformer saturation yog ib yam mob uas cov hlau nplaum ntawm CT mus txog nws qhov siab tshaj plaws flux muaj peev xwm thiab tsis tuaj yeem hloov pauv cov thawj tam sim no mus rau theem nrab. Thaum saturation tshwm sim, CT tso zis tsis raug rov tsim dua thawj cov nthwv dej tam sim no, ua rau cuam tshuam cov teeb liab thib ob, ntsuas qhov yuam kev, thiab muaj peev xwm ua haujlwm tsis zoo ntawm kev tiv thaiv relays. Kev nkag siab txog kev saturation yog ib qho tseem ceeb rau kev xaiv CT thiab kev tsim qauv, tshwj xeeb tshaj yog rau kev tiv thaiv cov ntawv thov uas qhov kev txhaum tam sim no tuaj yeem ua tau ntau zaus ntawm tus nqi ntsuas.
Qhov laj thawj tseem ceeb ntawm saturation yog tus cwj pwm sib nqus ntawm CT core khoom. Tam sim no transformers ua hauj lwm nyob rau hauv lub hauv paus ntsiab lus hais tias lub alternating thawj tam sim no induces ib tug alternating magnetic flux nyob rau hauv cov tub ntxhais, uas nyob rau hauv lem induces ib tug thib ob voltage thiab tam sim no. Qhov kev sib raug zoo no yog linear ntev npaum li cov tub ntxhais flux tseem qis dua qib saturation ntawm cov khoom tseem ceeb. Txawm li cas los xij, tag nrho cov khoom siv hlau nplaum muaj qhov ua kom tsis muaj zog- nqa lub peev xwm. Thaum cov flux tshaj qhov theem no, cov tub ntxhais tau hais tias yuav saturated, thiab cov kab sib txuas ntawm thawj thiab theem nrab tam sim no tawg.
Ntau yam tuaj yeem ua rau CT saturation. Feem ntau yog vim li cas yog qhov tseem ceeb tshaj tam sim no, xws li thaum muaj teeb meem txhaum cai. Thaum lub sijhawm ua haujlwm siab tam sim no, CT tus yam ntxwv ua haujlwm yuav raug cuam tshuam, tsim kev ua haujlwm tsis zoo ntawm cov khoom siv tiv thaiv. Thaum cov thawj tam sim no tshaj qhov CT qhov raug txwv, cov tub ntxhais saturates thiab theem nrab tam sim no waveform yuav distorted. Qhov loj ntawm qhov txhaum tam sim no, DC tivthaiv ntawm qhov txhaum tam sim no, thawj lub sijhawm tsis tu ncua, thiab cov dej ntws tsis tu ncua hauv cov tub ntxhais hlau tag nrho ua rau saturation.
DC tivthaiv ntawm qhov txhaum tam sim no ua lub luag haujlwm tseem ceeb hauv kev saturation. Kev txhaum tam sim no hauv cov tshuab hluav taws xob feem ntau muaj cov DC decaying offset uas tuaj yeem tsav lub CT core mus rau hauv saturation sai dua li AC tivthaiv ib leeg. Qhov kev tsis ncaj ncees DC no tuaj yeem ua kom nrawm nrawm ntawm kev tiv thaiv CTs los ntawm ob peb milliseconds thiab nce kev hloov pauv ntawm kev ntsuas CTs. Cov nyhuv yog tshaj tawm hauv cov tshuab nrog lub sijhawm ntev, xws li cov khoom siv loj inductive lossis cov kab sib kis ntev.
Remanent flux nyob rau hauv CT core yog lwm qhov ua tau zoo. Thaum CT cuam tshuam thaum lub sijhawm ua txhaum, cov tub ntxhais yuav khaws cov khoom seem sib nqus uas tuaj yeem ua tau zoo ib yam li cov flux uas ua los ntawm qhov txhaum tom ntej. Qhov dej ntws tsis tu ncua no txo cov flux headroom muaj ua ntej saturation, zoo txo qhov CT qhov chaw pib saturation. Qhov tshwm sim no tshwj xeeb yog teeb meem hauv kev tiv thaiv kev sib txawv uas ntau CTs yuav tsum ua haujlwm hauv kev sib koom tes.
Qhov pib ntawm saturation tuaj yeem tshawb pom los ntawm kev soj ntsuam cov excitation tam sim no. CT tus yam ntxwv excitation qhia tau hais tias muaj kev sib raug zoo ntawm kev siv hluav taws xob thiab kev ua kom muaj zog mus txog rau lub hauv caug taw tes, dhau qhov tam sim no nce nrawm nrog me me ntawm qhov voltage. Ib zaug nyob rau hauv cheeb tsam saturated, 10% nce nyob rau hauv daim ntawv thov voltage yuav ua rau ib tug 30% mus rau 50% nce nyob rau hauv lwm yam tam sim no, qhia tias cov tub ntxhais yog tsis muaj peev xwm txhawb ntxiv flux.
Cov teebmeem ntawm saturation ntawm CT kev ua tau zoo yog qhov tseem ceeb. Qhov thib ob tam sim no ua distorted, feem ntau nthuav tawm lub peaked waveform nrog txo qhov chaw piv rau thawj tam sim no. Qhov kev hloov pauv no ua rau qhov ua tau zoo RMS theem nrab tam sim no qis dua li qhov xav tau, ua rau hauv qab - ntsuas ntawm thawj tam sim no. Nyob rau hauv kev tiv thaiv daim ntaub ntawv, qhov distorted thib ob tam sim no yuav ua rau maloperation los yog kev khiav hauj lwm ncua sij hawm ntawm kev tiv thaiv relays. Kev ncua hauv kev ua haujlwm relay tuaj yeem ua rau muaj kev cuam tshuam loj rau kev ruaj ntseg thiab cov khoom siv tiv thaiv.
Kev xaiv cov khoom tseem ceeb plays lub luag haujlwm tseem ceeb hauv kev txiav txim siab cov yam ntxwv saturation. Cov khoom sib nqus sib txawv-xws li silicon steel, ferrite, permalloy, nanocrystalline, thiab amorphous alloys- muaj qhov sib txawv induction qib thiab lwm yam khoom sib nqus. Silicon steel yog cov khoom siv feem ntau siv rau kev tiv thaiv CTs vim nws qhov siab saturation flux ceev, thaum nanocrystalline cov ntaub ntawv muaj ntau dua permeability thiab qis dua. Qhov kev xaiv ntawm cov khoom tseem ceeb muaj xws li kev lag luam tawm - tawm ntawm kev ua haujlwm saturation, nqi, thiab lwm yam.
Kev tiv thaiv saturation yuav tsum tau CT tsim thiab daim ntawv thov. CT lub nra hnyav, cov chav kawm raug, thiab lub hauv caug taw tes voltage yuav tsum raug xaiv los xyuas kom meej tias cov tub ntxhais tseem nyob hauv nws thaj tsam hauv qab qhov siab tshaj plaws uas yuav tsum tau ua txhaum tam sim no. Rau kev tiv thaiv daim ntawv thov, qhov raug txwv qhov tseeb (ALF) qhia txog ntau yam ntawm cov ntsuas thawj tam sim no uas CT tseem yuav tsum tswj hwm nws qhov tseeb. Ib qho CT nrog ALF siab dua tuaj yeem tiv taus qhov cuam tshuam ntau dua yam tsis muaj saturating. Tsis tas li ntawd, txo qis lub nra nruab nrab-los ntawm kev siv qis- cov kab hluav taws xob qis, kev siv xov tooj luv luv, thiab cov kab hluav taws xob txaus txaus- ntu- pab khaws cia CT's flux headroom.
Hauv cov ntsiab lus, CT saturation yog ib qho kev txwv ntawm cov hlau nplaum -cov tub ntxhais tam sim no transformers uas yuav tsum tau ua tib zoo tswj los ntawm kev tsim thiab kev siv. Kev nkag siab txog qhov ua rau, qhov cuam tshuam, thiab kev tiv thaiv ntawm kev saturation yog qhov tseem ceeb rau kev ua kom muaj kev tiv thaiv kev ruaj ntseg thiab ntsuas qhov tseeb hauv cov tshuab hluav taws xob.