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Electric Power Distribution Engineering, 3rd Edition by Turan Gonen

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Appendix A

Impedance Tables for Lines, Transformers, and Underground Cables

Table A.1

Characteristics of Copper Conductors, Hard-Drawn, 97.3% Conductivity

Size of Conductor Circular Mils

AWC or B & S

Number of Strands

Diameter of Individual Strands (in.)

Outside Diameter (in.)

Breaking Strength (lb)

Weight (Ib/mi)

Approx. Current Carrying Capacitya (amps)

Geometric Mean Radius at 60 Cycles (ft)

ra Resistance (Ω/Conductor/mi)

Xa Inductive Reactance (Ω/Conductor/mi) at 1 ft Spacing

X'a Shunt Capacitive Reactance (MΩ · mi/Conductor) at 1 ft Spacing)

25°C (77°F)

50°C (122°F)

DC

25 Cycles

50 Cycles

60 Cycles

DC

25 Cycles

50 Cycles

60 Cycles

25 Cycles

50 Cycles

60 Cycles

25 Cycles

50 Cycles

60 Cycles

1,000,000

37

0.1644

1.151

43,830 ...

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