Ukuqhathaniswa Okusebenzayo Kweziguquli Zamanje Zokukala Ngokuqhathaniswa Nokuvikela

Ukunemba kwe-CT yokuvikelaUkunemba kwe-CT yokuvikela akukhona mayelana nokukhokhiswa okunembayo kodwa kumayelana nokusebenza okungabikezelwa ngesikhathi sephutha. Ukunemba kwayo kuchazwa "iphutha eliyinhlanganisela" ekuphindaphindeni okucacisiwe kwamandla ayo amanje alinganiselwe. Isigaba sokuvikela esijwayelekile5P10.Lokhu kuqokwa kuhlukaniswa kanje:

• 5: Iphutha eliyinhlanganisela ngeke lidlule u-5% emkhawulweni wokunemba.
• P: Le ncwadi iyichaza njengesigaba sokuvikela i-CT.
• 10: Lesi Isici Somkhawulo Wokunemba (ALF). Kusho ukuthi i-CT izogcina ukunemba kwayo okucacisiwe kufika izikhathi ezingu-10 zamanje ezilinganiselwe eziyinhloko.

Ngamafuphi, i-5P10 CT iqinisekisa ukuthi uma i-primary current iphinda izikhathi ezingu-10 isilinganiso sayo esivamile, isignali ethunyelwe ku-relay isengaphakathi kwe-5% yenani elifanele, iqinisekisa ukuthi i-relay yenza isinqumo sohambo esilungile.

Umthwalo kanye nesilinganiso se-VA

Umthwaloyisamba somthwalo kagesi oxhunywe kumatheminali esibili e-CT, akalwa nge-Volt-Amperes (VA) noma ohms (Ω). Yonke idivayisi nentambo exhunywe ku-CT inikela kulo mthwalo. Ukweqa umthwalo olinganiselwe we-CT kuzokwehlisa ukunemba kwayo.

Umthwalo ophelele yiisamba sama-impedance azo zonke izingxenyekusekethe yesibili:

• I-CT's own second winding resistance.
• Ukumelana nezintambo zokuhola ezixhuma i-CT kudivayisi.
• Ukuphazamiseka kwangaphakathi kwedivayisi exhunyiwe (imitha noma i-relay).

Ibala Umthwalo Ophelele:Unjiniyela angakwazi ukubala isamba somthwalo esebenzisa ifomula:Umthwalo Ophelele (Ω) = I-CT Winding R (Ω) + Intambo R (Ω) + Idivayisi Z (Ω)Isibonelo, uma i-CT's secondary winding resistance ingu-0.08 Ω, izintambo ezixhumayo zino-0.3 Ω wokumelana, futhi i-relay ine-impedance engu-0.02 Ω, isamba somthwalo wesekethe ngu-0.4 Ω. Leli nani kufanele libe ngaphansi komthwalo olinganiselwe we-CT ukuze isebenze ngendlela efanele.

Ama-CTs okulinganisa ngokuvamile anezilinganiso eziphansi ze-VA (isb, 2.5 VA, 5 VA) ngenxa yokuthi axhumeka kumadivayisi anamandla aphezulu, asebenzisa kancane amamitha ebangeni elifushane. I-Protection CTs idinga izilinganiso ze-VA eziphakeme kakhulu (isb, 15 VA, 30 VA) ngoba kufanele zinikeze amandla anele ukuze zisebenzise amakhoyili anezihibe eziphansi, okusetshenziswa kakhulu kwereyi yokuvikela, evamise ukugijima amakhebula amade kakhulu. Ukufanisa ngokungalungile isilinganiso somthwalo we-CT nomthwalo wesekethe wangempela umthombo ovamile wephutha kuzo zombili izikimu zokulinganisa nokuvikela.

Ukuqonda i-Knee Point Voltage

I-Knee Point Voltage (KPV) iyipharamitha ebalulekile etholakala kuphela kuma-CT okuvikela. Ichaza umkhawulo ongaphezulu wobubanzi bokusebenza obuwusizo be-CT ngaphambi kokuba umnyombo wayo uqale ukugcwala. Leli nani libalulekile ukuze kuqinisekiswe ukuthi i-relay evikelekile ithola isignali ethembekile ngesikhathi sephutha eliphezulu.

Onjiniyela banquma i-KPV ejikeni le-CT le-excitation, elihlela amandla kagesi esibili ajabulisayo ngokumelene nomsinga wesibili ojabulisayo. "Idolo" yiphuzu kuleli jika lapho izakhiwo kazibuthe eziyinhloko zishintsha kakhulu.

II-IEEE C57.13 ejwayelekileinikeza incazelo enembile yaleli phuzu. Ku-CT yomgogodla ongagebekile, iphoyinti ledolo yilapho i-tangent eya kwijika yakha i-engeli engama-degree angu-45 nge-eksisi evundlile. Ku-CT ewumgogodla ovulekile, le engeli ingama-degree angu-30. Leli phuzu elithile libonisa ukuqala kokugcwaliswa kwesikhala.

Uma i-CT isebenza ngaphansi kwe-voltage yephoyinti lamadolo, ingqikithi yayo isesimweni somugqa kazibuthe. Lokhu kuyivumela ukuthi ikhiqize kabusha ngokunembile iphutha lamanje le-relay exhunyiwe. Kodwa-ke, uma i-voltage yesibili idlula i-KPV, umnyombo ungena ekugcwaleni. I-Saturation, evame ukuqhutshwa amaza amakhulu e-AC kanye nama-DC offset ngesikhathi sephutha, kubangela i-CT'sI-magnetizing impedance yehle kakhulu. I-transformer ayisakwazi ukukhombisa ngokwethembeka i-current primary ohlangothini lwayo lwesibili.

Ubudlelwano phakathi kwe-KPV nokuthembeka kokuvikela buqondile futhi bubalulekile:

• Ngaphansi kwephuzu ledolo:I-CT core isebenza ngokulandelana. Inikeza ukumelwa okunembile kwephutha lamanje ku-relay yokuvikela.
• Ngaphezulu kwephoyinti ledolo:Umnyombo uyagcwala. Lokhu kuholela ekwandeni okukhulu kokusebenza kwamagnetizing kwamanje nokungewona umugqa, okusho ukuthi i-CT ayisabonisi ngokunembile iphutha lamanje langempela.
• Umsebenzi wokudlulisa:Ama-relay avikelayo adinga isignali enembile ukuze asebenze kahle. Uma i-CT igcwala ngaphambi kokuba i-relay ikwazi ukwenza isinqumo, i-relay ingase yehluleke ukubona ubukhulu beqiniso bephutha, okuholela ohambweni olubambezelekile noma ukwehluleka ngokuphelele ukusebenza.
• Ukuphepha Kwesistimu:Ngakho-ke, i-voltage yephoyinti ledolo le-CT kumele ibe phezulu ngokwanele kune-voltage yesibili ephezulu elindelwe ngesikhathi sephutha. Lokhu kuqinisekisa ukuthi i-relay ithola isignali ethembekile ukuze kuvikelwe imishini ebizayo.

Onjiniyela babala i-KPV edingekayo ukuze baqinisekise ukuthi i-CT ihlala ingagcwele ngaphansi kwezimo zephutha ezimbi kakhulu. Ifomula eyenziwe lula yalesi sibalo ithi:

I-KPV edingekayo ≥ Uma × (Rct + Rb)

Kuphi:

• If= Iphutha eliphezulu lesibili lamanje (Amps)
• Rct= Ukumelana nokuvunguza kwesibili kwe-CT (Ohms)
• Rb= Umthwalo ophelele we-relay, izintambo, nokuxhumana (Ohms)

Ekugcineni, i-Knee Point Voltage isebenza njengenkomba eyinhloko yekhono le-CT yokuvikela ukwenza umsebenzi wayo wokuphepha ngaphansi kwengcindezi enkulu kagesi.

Ukuqopha Ukuqokwa Kwe-Nameplate Yesiguquli Samanje

I-Current Transformer nameplate iqukethe ikhodi ehlangene echaza amandla ayo okusebenza. Lokhu kuqokwa kwezinhlamvu nezinombolo kuwulimi olufushane lonjiniyela, olucacisa ukunemba kwengxenye, uhlelo lokusebenza, nemikhawulo yokusebenza. Ukuqonda lawa makhodi kubalulekile ekukhetheni idivayisi efanele.

Ukuhumusha Izilinganiso Ze-CT Amakilasi (isb, 0.2, 0.5S, 1)

Amakilasi e-CT yokukala achazwa ngenombolo emele iphutha lephesenti eliphezulu elivumelekile esikhathini samanje esilinganiselwe. Inombolo encane ibonisa izinga eliphezulu lokunemba.

• Ikilasi 1:Ifanele ukulinganisa kwephaneli evamile lapho ukunemba okuphezulu kungabalulekile.
• Ikilasi 0.5:Isetshenziselwa izicelo zokukhokhisa ezohwebo nezimboni.
• Ikilasi 0.2:Iyadingeka ekulinganisweni kwemali engenayo okunembe kakhulu.

Amanye amakilasi afaka uhlamvu 'S'. Igama elithi 'S' ezigabeni ze-CT zokulinganisa ze-IEC, ezifana no-0.2S no-0.5S, libonisa ukunemba okuphezulu. Lesi sigaba esithile ngokuvamile sisetshenziswa ezinhlelweni zokusebenza zokulinganisa amanani lapho izilinganiso ezinembile zibalulekile, ikakhulukazi ekugcineni okuphansi kobubanzi bamanje.

Ukutolika amakilasi e-CT okuvikela (isb, 5P10, 10P20)

Amakilasi e-Protection CT asebenzisa ikhodi enezingxenye ezintathu echaza ukuziphatha kwawo ngesikhathi sephutha. Isibonelo esivamile ngu5P10.

Ukwephula Ikhodi ye-5P10:

• 5: Le nombolo yokuqala iyiphutha elikhulu eliyinhlanganisela ngamaphesenti (5%) emkhawulweni wokunemba.
• P: Uhlamvu 'P' esigabeni esifana nokuthi 5P10 lusho 'Isigaba sokuvikela'. Lokhu kubonisa ukuthi i-CT idizayinelwe ngokuyinhloko ukuvikela izinhlelo zokusebenza ezidluliswayo esikhundleni sokulinganisa okunembile.
• 10: Le nombolo yokugcina i-Accuracy Limit Factor (ALF). Kusho ukuthi i-CT izogcina ukunemba kwayo okucacisiwe kuze kufike lapho kunephutha khona izikhathi ezingu-10 isilinganiso sayo esivamile.

Ngokufanayo, a10P20isigaba CT sinomkhawulo wephutha oyinhlanganisela ongu-10% kanye Nesici Somkhawulo Wokunemba kokuthi20. Esimisweni esifana ne-10P20, inombolo '20' isho isici somkhawulo wokunemba. Lesi sici sibonisa ukuthi iphutha le-transformer lizohlala ngaphakathi kwemikhawulo eyamukelekayo uma yamanje iphinda izikhathi ezingu-20 inani layo elilinganiselwe. Leli khono libalulekile ekuqinisekiseni ukuthi ama-relay okuvikela asebenza ngendlela efanele phakathi nezimo ezinzima zesekethe emfishane.

Umhlahlandlela Wokufaka Isicelo: Ukufanisa i-CT nomsebenzi

Ukukhetha i-Current Transformer efanele akuyona indaba yokukhetha kodwa kuyimfuneko eshiwo uhlelo lokusebenza. I-CT yokulinganisa inikeza ukunemba okudingekayo kokwenziwe kwezezimali, kuyilapho i-CT yokuvikela iletha ukwethembeka okudingekayo ekuphepheni kwempahla. Ukuqonda ukuthi ungalusebenzisa kuphi uhlobo ngalunye kubalulekile ekwakhiweni nasekusebenzeni kwesistimu kagesi ezwakalayo.

Isetshenziswa nini i-CT yokukala

Onjiniyela kufanele basebenzise i-CT yokulinganisa kunoma yiluphi uhlelo lokusebenza lapho ukulandela ngomkhondo okunembile kokusetshenziswa kukagesi kuwumgomo oyinhloko. Lawa madivayisi ayisisekelo sokukhokha okunembile nokuphathwa kwamandla. Umklamo wabo ubeka phambili ukunemba okuphezulu ngaphansi kwezimo ezivamile zomthwalo.

Izinhlelo zokusebenza ezibalulekile zokulinganisa ama-CT zifaka:

• Imali engenayo kanye ne-Tariff Metering: Izinsiza zisebenzisa ama-CT anembe kakhulu (isb, Ikilasi 0.2S, 0.5S) kumakhasimende akhokhayo ezindawo zokuhlala, ezentengiso, nezimboni. Ukunemba kuqinisekisa ukuthengiselana kwezezimali okufanelekile nokulungile.
• I-Energy Management Systems (EMS): Izikhungo zisebenzisa lawa ma-CTs ukuqapha ukusetshenziswa kwamandla kuyo yonke iminyango ehlukene noma izingcezu zamathuluzi. Le datha isiza ukukhomba ukungasebenzi futhi ithuthukise ukusetshenziswa kwamandla.
• Ukuhlaziywa Kwekhwalithi Yamandla: Abahlaziyi bekhwalithi yamandla badinga okokufaka okunembile ukuze kuhlonzwe izinkinga ezifana nama-harmonics nama-voltage sags. Kulezi zilinganiso, ikakhulukazi ezinhlelweni zamandla kagesi aphakathi, impendulo yemvamisa ye-transformer yensimbi ibalulekile. Abahlaziyi besimanje bangase badinge idatha ethembekilekuze kufike ku-9 kHz, ifuna ama-frequency-optimized transformers ukuze ithwebule i-harmonic spectrum.

Inothi Ngokukhetha:Lapho ukhetha i-CT yemitha yamandla noma i-analyzer, izici ezimbalwa zibalulekile.

• Ukuhambisana Komphumela: Okukhiphayo kwe-CT (isb, 333mV, 5A) kufanele kufane nezidingo zokufaka zemitha.
• Usayizi Wokulayisha: Ububanzi be-amperage ye-CT kufanele buhambisane nomthwalo olindelekile ukuze kugcinwe ukunemba.
• I-Physical Fit: I-CT kufanele ilingane ngokomzimba eduze kukakhondakta. Amakhoyili e-Flexible Rogowski ayisixazululo esisebenzayo samabhasi amakhulu noma izindawo eziqinile.
• Ukunemba: Ngokukhokhiswa, ukunemba okungu-0.5% noma okungcono kujwayelekile. Ukuze kuqashwe okuvamile, u-1% ungase wanele.

Isetshenziswa nini i-Protection CT

Onjiniyela kufanele basebenzise i-CT yokuvikela noma yikuphi lapho inhloso eyinhloko kuwukuvikela abasebenzi kanye nezisetshenziswa ekugezeni amanzi kanye namaphutha. Lawa ma-CTs aklanyelwe ukuthi aqhubeke esebenza phakathi nemicimbi kagesi eyeqisayo, enikeza isignali ethembekile kudluliselwe okuvikelayo.

Izicelo ezijwayelekile zokuvikela i-CTs zifaka:

• I-Overcurrent kanye ne-Earth Fault Protection: Lawa ma-CTs okuphakelayo amasiginali kuya kuma-relay (njenge-ANSI Device 50/51) athola amaphutha esigaba noma aphansi. I-relay ibe igila i-circuit breaker ukuze ihlukanise iphutha. Ku-switchgear ye-medium-voltage, kusetshenziswa okuzinikelei-zero-sequence CTukuvikela iphutha eliphansi kuvame ukutuswa phezu koxhumano oluyinsalela lweIzigaba ezintathu ze-CTs. Uxhumano oluyinsalela lungaholela ohambweni lwamanga ngenxa yokugcwala kwesikhala ngokungalingani phakathi nokuqaliswa kwemoto noma amaphutha esigaba.
• Ukuvikelwa Okuhlukile: Lolu hlelo luvikela izimpahla ezinkulu njengama-transformer namajeneretha ngokuqhathanisa ama-currents angena futhi aphuma endaweni evikelekile. Idinga amasethi afanayo okuvikela ama-CTs.Ukudluliselwa kwedijithali yesimanjeinganxephezela ukuxhumana okuhlukile kwe-CT (i-Wye noma i-Delta) kanye nokushintsha kwesigaba ngokusebenzisa izilungiselelo zesofthiwe, enikeza ukuguquguquka okuphawulekayo kulezi zinhlelo eziyinkimbinkimbi.
• Ukuvikelwa Kwebanga: Isetshenziswa emigqeni yokudlulisela, lolu hlelo luncike kuma-CTs okuvikela ukukala ukuthintana nephutha. Ukugcwaliswa kwesikhala kwe-CT kungahlanekezela lesi silinganiso, kubangele ukuthi i-relay ingahluleli ngokungeyikho indawo yephutha. Ngakho-ke, i-CT kufanele yakhelwe ukugwema ukugcwaliswa kwesikhala phakathi nesikhathi sokulinganisa.

Ngokusho kwe-ANSI C57.13, i-CT ejwayelekile yokuvikela kufanele imelaneizikhathi ezingu-20umthamo wayo olinganiselwe ngesikhathi sephutha. Lokhu kuqinisekisa ukuthi ingaletha isignali esebenzisekayo ku-relay uma kubaluleke kakhulu.

Izindleko Eziphezulu Zokukhetha Okungalungile

Ukusebenzisa uhlobo olungalungile lwe-CT kuyiphutha elibucayi elinemiphumela emibi. Umehluko wokusebenza phakathi kwama-CT wokulinganisa nokuvikela awashintsheki, futhi ukungafani kungaholela emiphumeleni eyingozi nebizayo.

• Ukusebenzisa i-Measurement CT yokuvikela: Leli iphutha eliyingozi kakhulu. I-CT yokulinganisa yakhelwe ukuthi igcwale kuma-overcurrents aphansi ukuvikela imitha. Ngesikhathi sephutha elikhulu, izogcwala cishe ngokushesha. I-CT egcwele izohluleka ukukhiqiza kabusha iphutha eliphezulu lamanje, futhi i-relay evikelayo ngeke ibone ubukhulu bangempela bomcimbi. Lokhu kungaholela ohambweni olubambezelekile noma ukwehluleka ngokuphelele ukusebenza, okuholela ekulimaleni okuyinhlekelele kwemishini, umlilo, kanye nobungozi kubasebenzi. Isibonelo, ukugcwaliswa kwe-CT kungabangela ukudluliswa kokuvikela okuhlukile kwe-transformermaloperate, okuholela ohambweni olungafunwa phakathi nephutha langaphandle.
• Ukusebenzisa i-Protection CT yokukala: Lokhu kukhetha kuholela ekungalungisweni kwezimali. I-CT yokuvikela ayakhelwe ukunemba kumaza okusebenza avamile. Isigaba sayo sokunemba (isb, i-5P10) siqinisekisa ukusebenza ngokuphindaphinda okuphezulu kokulinganisa kwayo, hhayi ekugcineni okuphansi kwesikali lapho amasistimu amaningi asebenza khona. Ukuyisebenzisela ukukhokhisa kungafana nokulinganisa uhlamvu lwesihlabathi ngothi lweyadi. Izindleko zamandla eziwumphumela zizobe zinganembile, okuholela ekulahlekeni kwemali engenayo yensiza noma ukushajwa ngokweqile komthengi.

Isimo Sokwehluleka Okubalulekile:Ezinhlelweni zokuvikela ibanga, ukugcwaliswa kwe-CT kubangela ukuthi i-relay ilinganise aimpedance ephakemekunenani langempela. Lokhu kufinyeza ngempumelelo ukufinyelela kokuvikela kwe-relay. Iphutha okufanele lisulwe ngokushesha lingase libonakale njengephutha elikude, elidala uhambo olubambezelekayo. Lokhu kubambezeleka kwandisa ingcindezi ohlelweni lukagesi futhi kwandisa amathuba omonakalo osabalele.

Ekugcineni, izindleko zokukhethwa kwe-CT okungalungile zidlula kakhulu intengo yengxenye ngokwayo. Ibonakala ekucekeleni phansi kwemishini, isikhathi sokungasebenzi, amarekhodi ezezimali anganembile, kanye nokuphepha okusengozini.

Ingabe I-CT Eyodwa Ingasebenza Kokubili Ukulinganisa Nokuvikela?

Nakuba ama-CT okulinganisa nokuvikela anemiklamo ehlukile, onjiniyela ngezinye izikhathi badinga idivayisi eyodwa ukuze benze imisebenzi yomibili. Lesi sidingo siholele ekuthuthukisweni kwama-transformer ayisipesheli anezinjongo ezimbili, kodwa eza nokuhwebelana okuthile.

I-Dual-Purpose (Class X) CT

Isigaba esikhethekile, esaziwa ngokuthi yi-I-Class X noma i-PS Class Current Transformer, ingasebenza kokubili izindima zokulinganisa nokuvikela. Lawa madivayisi awachazwa ngamakilasi okunemba ajwayelekile afana ne-5P10. Kunalokho, ukusebenza kwabo kucaciswa isethi yamapharamitha angukhiye unjiniyela awasebenzisayo ukuze aqinisekise ukufaneleka kwawo kusikimu esithile sokuvikela.

Ngokwemigomo ye-IEC, ukusebenza kwe-Class X CT kuchazwa ngokuthi:

• Ikalwe okwamanje
• Ijika isilinganiso
• I-Knee point voltage (KPV)
• I-magnetizing current ku-voltage eshiwo
• Ukumelana nokuvunguza kwesibili ku-75°C

Lezi zici zivumela idivayisi ukuthi inikeze ukunemba okuphezulu kokulinganisa ngaphansi kwezimo ezijwayelekile kuyilapho ihlinzeka ngevolthi yephoyinti edolweni ebikezelwayo yokusebenza okuthembekile kokudluliselwa phakathi kwamaphutha. Zivame ukusetshenziswa ezinhlelweni zokuvikela eziphakeme zokuthikamezeka lapho ukusebenza kufanele kwaziwe ngokunembile.

Imikhawulo Engokoqobo kanye Nokuhwebelana

Ngaphandle kokuba khona kwe-Class X CTs, ukusebenzisa idivayisi eyodwa kukho kokubili ukulinganisa nokuvikela kuvame ukugwenywa. Le misebenzi emibili inezidingo ezingqubuzanayo.

I-CT yokulinganisa yakhelwe ukuthi igcwale kusenesikhathi ukuze ivikele amamitha azwelayo. Aukuvikela CT yakhelweukumelana nokugcwala ukuze uqinisekise ukuthi i-relay ingathola iphutha. I-CT enezinjongo ezimbili kufanele ivumelane phakathi kwalezi zinhloso ezimbili eziphikisanayo.

Lokhu kuvumelana kusho ukuthi i-CT enezinjongo ezimbili ingase ingenzi noma yimuphi umsebenzi kanye neyunithi ezinikele. Umklamo uba yinkimbinkimbi futhi ubiza kakhulu. Ezinhlelweni eziningi, ukufaka ama-CT amabili ahlukene, ayisipesheli—eyokumitha kanye neyokuvikela—kuyisixazululo esithembeke kakhulu nesingabizi kakhulu. Le ndlela iqinisekisa ukuthi kokubiliuhlelo lokukhokhafuthi uhlelo lokuphepha lusebenza ngaphandle kokuyekethisa.

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Ukukhetha phakathiama-CT wokulinganisa nokuvikelakuyisinqumo esicacile esisekelwe ekubekeni kuqala umsebenzi. Enye ihlinzeka ngokunemba kwenkokhelo, kanti enye iqinisekisa ukwethembeka ngesikhathi sephutha. Ukukhetha uhlobo olulungile akuxoxiswana ngakho mayelana nokuphepha kwesistimu, ukunemba kwezimali, nokuphila isikhathi eside kwemishini. Onjiniyela kufanele ngaso sonke isikhathi babhekise iziqondiso ze-CT ngezidingo zedivayisi exhunyiwe.

Auhlu lokugcina lokuqinisekisakuhlanganisa:

1. Nquma Okuyisisekelo Kwamanje: Qondanisa isilinganiso se-CT nomthwalo omkhulu.
2. Bala Umthwalo: Fingqa umthwalo wazo zonke izingxenye ezixhunyiwe.
3. Qinisekisa Ikilasi Lokunemba: Khetha ikilasi elilungile lokulinganisa noma ukuvikela.

FAQ

Kwenzekani uma isekethe yesibili ye-CT ishiywa ivuliwe?

Isekhethi yesibili evulekile idala i-voltage ephezulu eyingozi. Umsinga oyinhloko uba wamanje ozibuthe, ugcwale umnyombo. Lesi simo singabhubhisa i-CT futhi sidale ingozi enkulu yokushaqeka.

Ukuphepha Kuqala:Hlale ufinyeza amatheminali esibili ngaphambi kokunqamula noma iyiphi insimbi kusekethe.

Onjiniyela basikhetha kanjani isilinganiso esifanele se-CT?

Onjiniyela bakhetha isilinganiso lapho isilinganiso esiphezulu esivamile sesistimu siseduze nesilinganiso esiyinhloko se-CT. Lokhu kukhetha kuqinisekisa ukuthi i-CT isebenza ngaphakathi kwebanga elinembile kakhulu. Isibonelo, umthwalo we-90A usebenza kahle nge-100:5A CT.

Kungani i-CT yokukala ingaphephile ukuze ivikeleke?

I-CT yokukala igcwala ngokushesha phakathi nephutha. Ayikwazi ukubika iphutha langempela kwi-relay evikelayo. I-relay ibe ihluleka ukukhuba isinqamuli, okuholela ekucekeleni phansi kwemishini kanye nezingozi ezinkulu zokuphepha.

Ingabe i-CT eyodwa ingasebenza kokubili ukulinganisa nokuvikela?

I-Special Class X CTs ingasebenza zombili izindima, kodwa ukwakheka kwawo kuwukuyekethisa. Ukuze uthole ukuphepha okuphelele nokunemba, onjiniyela ngokuvamile bafaka ama-CT amabili ahlukene, azinikele—eyodwa yokulinganisa neyokuvikela.