Fomular da kawo kashi na kable na aiki na musamman
Don samun gyara abin da aka yi a kan layi mai kyau, girman layi da kuma amfani, zan iya tabbatar da cewa muke samun hanyar da ke kan layi da ke amfani. Zanen hanyoyin gyaran abin za su taimaka maka a gyara abin da suka gama a cikin masanaolin da suke da layi a ciki. Ba ya kamata ina son ina yi a kan copper ko aluminum conductors.
Gyaran DC / single phase
Abin da aka gyara V a volts (V) yana da muhimmanci a matsayin layi I a amps (A) times 2 times one way wire size length L a feet (ft) times the wire resistance per 1000 feet R a ohms (Ω/kft) divided by 1000:
Vdrop (V) = Iwire (A) × Rwire(Ω)
= Iwire (A) × (2 × L(ft) × Rwire(Ω/kft) / 1000(ft/kft))
Abin da aka gyara V a volts (V) yana da muhimmanci a matsayin layi I a amps (A) times 2 times one way wire length L a meters (m) times the wire resistance per 1000 meters R a ohms (Ω/km) divided by 1000:
Vdrop (V) = Iwire (A) × Rwire(Ω)
= Iwire (A) × (2 × L(m) × Rwire (Ω/km) / 1000(m/km))
Gyaran 3 phase
Abin da aka gyara V a volts (V) yana da muhimmanci a matsayin square root of 3 times the wire current I a amps (A) times one way wire length L a feet (ft) times the wire resistance per 1000 feet R a ohms (Ω/kft) divided by 1000:
Vdrop (V) = √3 × Iwire (A) × Rwire (Ω)
= 1.732 × Iwire (A) × (L(ft) × Rwire (Ω/kft) / 1000(ft/kft))
Abin da aka gyara V a volts (V) yana da muhimmanci a matsayin square root of 3 times the wire current I a amps (A) times one way wire length L a meters (m) times the wire resistance per 1000 meters R a ohms (Ω/km) divided by 1000:
Vdrop (V) = √3 × Iwire (A) × Rwire (Ω)
= 1.732 × Iwire (A) × (L(m) × Rwire (Ω/km) / 1000(m/km))
Gyaran diameter na layi
Diameter na layi n gauge wire dn a inches (in) yana da muhimmanci a matsayin 0.005in times 92 raised to the power of 36 minus gauge number n, divided by 39:
dn (in) = 0.005 in × 92(36-n)/39
Diameter na layi n gauge wire dn a millimeters (mm) yana da muhimmanci a matsayin 0.127mm times 92 raised to the power of 36 minus gauge number n, divided by 39:
dn (mm) = 0.127 mm × 92(36-n)/39
Gyaran cross sectional area na layi
Cross sectional area na layi n gauge An a kilo-circular mils (kcmil) yana da muhimmanci a matsayin 1000 times the square wire diameter d a inches (in):
An (kcmil) = 1000×dn2 = 0.025 in2 × 92(36-n)/19.5
Cross sectional area na layi n gauge An a square inches (in2) yana da muhimmanci a matsayin pi divided by 4 times the square wire diameter d a inches (in):
An (in2) = (π/4)×dn2 = 0.000019635 in2 × 92(36-n)/19.5
Cross sectional area na layi n gauge An a square millimeters (mm2) yana da muhimmanci a matsayin pi divided by 4 times the square wire diameter d a millimeters (mm):
An (mm2) = (π/4)×dn2 = 0.012668 mm2 × 92(36-n)/19.5
