Transmisssion Line Resistance

# Transmisssion Line Resistance - Conductors for Transmission...

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300 amp A 2.798 amp mm 2 = Current Density for Copper 4/0 R DC 0.302 = R DC L ρ 50 1.02 A := L 5280 ft = L1 m i := (c) DC-resistance at 50 deg C for conductor of 1 mile assume 2% increase due to spiraling: ρ 50 11.883 cmil ft = ρ 50 ρ Cu.hd 50 241.5 + 20 241.5 + := ρ Cu.hd 10.66 cmil ft := ρ Cu.hd 10.647 cmil ft = ρ Cu.hd 1.77 10 8 ⋅Ω m := ρ T2 ρ T1 T2 T + T1 T + = Unit for ρ = m : m m 2 m () = Units: R L A ρ = (b) Verify DC resistance of 0.302 Ohm/mile at 50 deg C: A 211630 cmil = A1 2 π d 2 2 := d 0.1328 in := (a) Find cross section of Copper 4/0 with 12 strands of 0.1328 in diameter: Example 4.1, Page 174: One circular mil is the area of a circle with 1mil diameter! cmil π 4 mil 2 mil in 1000 π D 2 2 Global Unit Definitions: February-26-2008: Conductors for Transmission Lines:

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Transmisssion Line Resistance - Conductors for Transmission...

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