A two-winding single-phase transformer rated 6 0 kVA , 24 0 / 12 00 V , 6 0 Hz , has an efficiency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a 144 0 / 12 00 -V step-down autotransformer in a power distribution system. (a) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two-winding transformer. Assume an ideal transformer. (b) Determine the efficiency of the autotransformer with the kVA loading of part (a) and 0.8 power factor leading.
A two-winding single-phase transformer rated 6 0 kVA , 24 0 / 12 00 V , 6 0 Hz , has an efficiency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a 144 0 / 12 00 -V step-down autotransformer in a power distribution system. (a) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two-winding transformer. Assume an ideal transformer. (b) Determine the efficiency of the autotransformer with the kVA loading of part (a) and 0.8 power factor leading.
A two-winding single-phase transformer rated
6
0
kVA
,
24
0
/
12
00
V
,
6
0
Hz
,
has an efficiency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a
144
0
/
12
00
-V
step-down autotransformer in a power distribution system. (a) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two-winding transformer. Assume an ideal transformer. (b) Determine the efficiency of the autotransformer with the kVA loading of part (a) and 0.8 power factor leading.
3-1) Similar to Lathi & Ding prob. 3.1-1. Use direct integration to find the Fourier transforms of the
signals shown below.
a) g₁(t) = II(t − 2) + 2 exp (−3|t|)
b) g(t) = d(t+2)+3e¯u (t − 2)
3-2)
Lathi & Ding prob. 3.1-5. From the definition in eq. 3.1b, find the inverse Fourier transforms of the
spectra in the figure below.
G(f)
COS лf
10
(a)
G(f) 1
-B
B
(b)
Fundamentals of Energy Systems HW 4 Q2
Chapter 3 Solutions
Power System Analysis and Design (MindTap Course List)
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