ross the conductor cross section is nonuniform and is a function of the ac free

Question

ross the conductor cross section is nonuniform and is a function of the ac free enon, known as the skin effect, causes the ac resistance to be greater than 60 Hz, the ac resistance of a transmission-line conductor may be 5 to 10 percent sistance. perature dependence of resistance is quantified by the relation TI)] Ril1 a(72 nd R2 are the resistances at temperatures and T2, respectively, and a is calle coefficient of resistance. The resistivities and temperature coefficients of several m Table 3-1. TABLE 1 Resistivities and Temperature Coenicients of Resistance Resistivity p at 20C Temperature coefficient Material a at 20°C, Aluminum 2.83 0.0039 Brass 6.4-8.4 0.0020 Copper Hard-drawn 1.77 0.00382 Annealed 1.72 0.00393 10.0 0.0050 Silver 1.59 0.0038 12-88 0.001-0.005 Long transmission lines may involve shunt resistances (or conductances in addition to series 26

Explanation / Answer

R2=R1(1+a(T2-T1))

25*1.1=25*(1+a(50-15))

0.1/35=a

30=25*(1+a(T2-15))

0.2/a=T2-15

70+15=T2

T2=85 Celcius

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