Three single-phase two-winding transformers, each rated 25MVA , 54 . 2 / 5 . 42 kV , are connected to form a three-phase Y-Δ bank with a balanced Y-connected resistive load of 0 .6 Ω per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance R L in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.
Three single-phase two-winding transformers, each rated 25MVA , 54 . 2 / 5 . 42 kV , are connected to form a three-phase Y-Δ bank with a balanced Y-connected resistive load of 0 .6 Ω per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance R L in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.
Three single-phase two-winding transformers, each rated
25MVA
,
54
.
2
/
5
.
42
kV
,
are connected to form a three-phase
Y-Δ
bank with a balanced Y-connected resistive load of
0
.6
Ω
per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance
R
L
in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.
5. Determine the CT convolutions for the signals below. Sketch the signal that flips and on same plot the
one that is not flipped. Do this for each overlap case. Clearly indicate all overlap cases and the integral
limits. Finally, using the left squiggly bracket notation, show the output for each case versus time.
(c) 4
x(t)
2
1
2(t) 4
x(t) 4
0123
et 20
x(t)
(4) 4
(a)
+(1)
24
T
0123
(b)
T
(f)
1
2-2
0123
(c)
(f)
0123
(d)
(1) A
t
1(8)
4,121
-101
3
(e)
Solve by pen and paper not using chatgpt or AI
Find the current io, and the voltage vo in the circuit in Figure 4. Answer: ἱο = 1.799 Α, νο = 17.99 V.
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