Dab tsi yog "Knee Point" thaum kuaj CT?
Xav txog CT zoo li ib daim phuam ntub dej. Thaum xub thawj, nws absorbs dej (voltage) yooj yim. Tab sis thaum kawg, nws tau ntub dej (saturated) thiab tuav tsis tau ntxiv lawm. Lub hauv caug Point yog qhov kev hloov mus rau hauv lub xeev "tag nrho".
Lub tswvyim:
• Ib txwm: Cov tub ntxhais hlau yog "tsis muaj." Voltage nce → me me exciting tam sim no nce.
• Lub hauv caug Point: Cov tub ntxhais hlau yuav luag "tag nrho" ntawm cov hlau nplaum.
• Saturation: Core yog "dhau." Loj loj voltage nce → yuav luag tsis muaj flux ntxiv.
Txuj kev txhais (IEC):
• Lub ntsiab lus uas 10% nce hauv qhov hluav taws xob ua rau 50% nce hauv qhov zoo siab tam sim no.
Vim li cas nws tseem ceeb: Yog tias CT saturates thaum muaj kev txhaum, nws "dag" rau kev tiv thaiv relay. Qhov thib ob tam sim no nres tom qab thawj zaug, thiab tus relay yuav tsis mus.