Thaum cable factories txheej txheem thiab tsim thhn xov hlau, lawv kuj faib lawv mus rau ntau yam khoom sib txawv, xws li American standard UL83 thhn hlau thiab Philippine txheem BPS certified thhn hlau. Ntxiv mus, cov cores siv rau txawv thhn cables kuj txawv. Feem ntau, tooj liab thhn hlau siv tau zoo dua thhn txhuas hlau. Tam sim no cia peb saib qhov zoo ntawm tooj liab thhn hlau tshaj thhn txhuas hlau hauv kev siv.
1, Nyob rau hauv cov nqe lus ntawm resistivity, tooj liab thhn hlau yog qis dua thhn txhuas hlau
Ua ntej, lub Hoobkas cable tau qhia peb tias rau hom tooj liab thhn hlau, nws qhov kev tiv thaiv qis dua li ntawm thhn txhuas hlau. Qhov no yog vim thhn txhuas hlau muaj ib tug ntau dua resistivity thaum conducting tshaj tooj liab thhn hlau. Yog li ntawd, tom qab ua thiab tsim rau hauv cable thhn, kuj tseem muaj qhov sib txawv ntawm qhov sib txawv ntawm lawv. Thaum xaiv, nws yog ib qho tseem ceeb uas yuav tau xaiv cov khoom siv tooj liab thhn hlau.
2, Copper thhn hlau muaj ductility zoo dua
Kuj tseem muaj qhov sib txawv ntawm ductility ntawm tooj liab thhn hlau thiab thhn txhuas hlau. Feem ntau, rau hluav taws xob tooj liab, nws cov ductility yog siab dua, feem ntau ncav cuag 30%. Txawm li cas los xij, rau aluminium alloys, ductility feem ntau tsuas yog 18%. Rau thhn loj cables xws li 500 thhn tooj liab hlau, 600 MCM thhn, thiab thhn 250 MCM, qhov ductility yog ntau dua. Yog li tseem muaj qhov sib txawv tseem ceeb ntawm ob qho hauv qhov no.
3, Kev siv zog kuj txawv
Muaj qhov sib txawv tseem ceeb ntawm lub zog ntawm tooj liab thhn hlau thiab thhn txhuas hlau. Nyob rau hauv chav tsev kub, tooj liab muaj zog ntau dua li txhuas, thiab ntawm qhov kub thiab txias, tooj liab muaj zog ntau dua li txhuas. Yog li ntawd, tooj liab cores feem ntau yog siv nyob rau hauv hluav taws xob cables.
Plaub, kev ruaj ntseg thiab qaug zog kuj tseem txawv
Tsis tas li ntawd, cov tuam txhab cable tau hais rau peb tias THHN cables kuj muaj qhov sib txawv tseem ceeb hauv kev ruaj ntseg thiab qaug zog. Tooj liab feem ntau muaj elasticity zoo heev hauv ntau yam thiab tsis yooj yim tawg thaum siv. Txawm li cas los xij, aluminium cores feem ntau tawg vim rov khoov dua. Tsis tas li ntawd, tooj liab cores muaj oxidation zoo heev, tab sis txhuas cores feem ntau raug rau corrosion.
