Xaiv cov kab hluav taws xob uas tsim nyog tshaj plaws rau kev xa hluav taws xob yog qhov tseem ceeb los xyuas kom meej tias lub tshuab hluav taws xob ua haujlwm tau zoo thiab nyab xeeb. Muaj ntau yam tseem ceeb uas yuav tsum tau xav txog thaum xaiv cov cables. Cov no muaj xws li kev khiav hauj lwm voltage, kev khiav hauj lwm zaus, rwb thaiv tsev theem, cross-section cheeb tsam (mm2), tus neeg xyuas pib hom, core tooj, nruab nrab thiab earthing cable, thiab derating yam.
Thawj qhov yuav tsum tau xav txog yog qhov ua haujlwm voltage. Qhov no yog qhov voltage uas lub cable yuav ua haujlwm, thiab nws yog ib qho tseem ceeb uas yuav tau xaiv ib lub cable uas ntsuas rau qhov voltage ntawm qhov system. Qhov ntsuas hluav taws xob yuav tsum sib npaug los yog ntau dua qhov siab tshaj plaws ntawm qhov system.
Qhov tseem ceeb tom ntej yog kev khiav hauj lwm zaus. Qhov no yog qhov zaus ntawm lub cable yuav nqa lub zog, thiab nws tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cable. Ntau hom cables yog tsim los rau ntau zaus, yog li nws yog ib qho tseem ceeb uas yuav tau xaiv txoj cai cable rau qhov zaus ntawm qhov system.
Rwb thaiv tsev theem kuj tseem ceeb heev rau kev txiav txim siab thaum xaiv ib lub cable rau lub hwj chim. Qhov ntsuas hluav taws xob ntawm cov kab hluav taws xob yuav tsum sib npaug los yog ntau dua qhov ntsuas hluav taws xob ntawm qhov system. Qhov no yuav xyuas kom meej tias lub cable muaj peev xwm nqa tau lub zog yam tsis muaj kev pheej hmoo ntawm hluav taws xob arcing lossis tawg.
Qhov chaw hla ntu (mm2) ntawm cable yuav tsum tau txiav txim siab. Qhov chaw hla ntu txiav txim siab lub peev xwm nqa tam sim no ntawm lub cable. Lub cable yuav tsum tau qhov loj me los tswj qhov siab tshaj plaws tam sim no uas yuav ntws los ntawm nws. Ib lub cable uas me me dhau rau qhov load tam sim no tuaj yeem overheat thiab ua rau hluav taws kub.
Tus neeg xyuas pib yog hais txog cov khoom siv rau cov khoom siv hluav taws xob cable. Feem ntau hom conductors yog tooj liab thiab txhuas. Copper paub txog nws cov conductivity siab, thaum txhuas yog pheej yig dua thiab hnav. Kev xaiv ntawm tus neeg xyuas pib yog nyob ntawm ntau yam, xws li qhov kev ncua deb ntawm lub cable khiav, theem voltage, thiab load yuav tsum.
Tus naj npawb tseem ceeb yog hais txog tus naj npawb ntawm cov conductors hauv lub cable. Cov naj npawb tseem ceeb tshaj plaws yog ib leeg-core, ob-core, thiab peb-core. Ib leeg-tub ntxhais cables yog siv rau high-voltage fais fab kis, thaum ob thiab peb-core cables yog siv rau qis voltage theem. Xaiv tus naj npawb tsim nyog nyob ntawm seb lub zog yuav tsum tau ua, qib voltage, thiab tus naj npawb ntawm cov theem cuam tshuam.
Cov kab nruab nrab thiab hauv av yog qhov tseem ceeb rau kev nyab xeeb hluav taws xob xa mus. Lub nruab nrab cable muab txoj hauv kev rov qab los rau tam sim no, thaum earthing cables tiv thaiv lub cev los ntawm qhov hluav taws xob ntau dhau thiab tam sim no. Hom nruab nrab thiab earthing cable yuav tsum nyob ntawm qhov system qhov voltage, hom earthing system siv, thiab hom kev tiv thaiv kev ua haujlwm.
Derating yam xa mus rau qhov kev hloov kho rau lub cable lub peev xwm nqa tam sim no raws li ib puag ncig thiab kev teeb tsa. Cov yam ntxwv xws li kub ambient kub, underground installation, thiab cable bundling yuav cuam tshuam rau lub cable kev khiav hauj lwm kub thiab, yog li, nws muaj peev xwm nqa tam sim no. Kev xaiv ntawm cable loj hais txog qhov derating yam tseem ceeb los xyuas kom meej tias lub cable ua haujlwm zoo thiab nyob rau hauv nws cov kev txwv tsim.