The Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft at 20 ° C and a 60-Hz resistance of 0.0956 ohm per mile at 50 ° C for the all-aluminum Marigold conductor, which has 61 strands and whose size is 1113 kcmil. Assuming an increase in resistance of 2 % for spiraling, calculate and verify the dc resistance. Then calculate the dc resistance at 50 ° C, and determine the percentage increase due to skin effect.
The Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft at 20 ° C and a 60-Hz resistance of 0.0956 ohm per mile at 50 ° C for the all-aluminum Marigold conductor, which has 61 strands and whose size is 1113 kcmil. Assuming an increase in resistance of 2 % for spiraling, calculate and verify the dc resistance. Then calculate the dc resistance at 50 ° C, and determine the percentage increase due to skin effect.
Solution Summary: The author explains the value of dc resistance at 20°C and the percentage increase due to skin effect.
The Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft at
20
°
C
and a 60-Hz resistance of 0.0956 ohm per mile at
50
°
C
for the all-aluminum Marigold conductor, which has 61 strands and whose size is 1113 kcmil. Assuming an increase in resistance of
2
%
for spiraling, calculate and verify the dc resistance. Then calculate the dc resistance at
50
°
C,
and determine the percentage increase due to skin effect.
4. For the periodic signal shown in Fig. 4;
a) Find the exponential Fourier Series for y(t).
b) Use Parseval's Theorem to compute the total power contained in the 4th harmonic and all higher
harmonics.
2+
y(t)
+
-2л
-л
0
2л
Зл
4л
Fig. 4
2. a) Find the Fourier transform of the signal
shown in Fig. 2 and express it in its most
compact form;
b) Find the value of the energy spectral
density at f=1/4.
0
-2
-1
-3.
Fig. 1
g(t)
3
1
2
t-
Fig 2
5. Consider a filter whose transfer function is: H(f) =
-12xfß
(a + jπ f ) ²
(a) show that the filter is non-causal for α = 3, p= -1;
(b) choose alternate values of α, ẞ that result in a causal filter, and demonstrate that your choice
valid.
Chapter 4 Solutions
MindTap Engineering for Glover/Overbye/Sarma's Power System Analysis and Design, 6th Edition, [Instant Access], 1 term (6 months)
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