Three single-phase transformers, each rated 1 0 MVA , 66 . 4 / 12 . 5 kV , 6 0 Hz , with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are V-connected and their terminals are directly connected to a 115-kV three-phase bus. The secondary terminals are all shorted together. Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are (a) Y-connected and (b) Δ- connected.
Three single-phase transformers, each rated 1 0 MVA , 66 . 4 / 12 . 5 kV , 6 0 Hz , with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are V-connected and their terminals are directly connected to a 115-kV three-phase bus. The secondary terminals are all shorted together. Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are (a) Y-connected and (b) Δ- connected.
Solution Summary: The author calculates the value of current going in the system using power rating and line to line voltage of each transformer.
Three single-phase transformers, each rated
1
0
MVA
,
66
.
4
/
12
.
5 kV
,
6
0
Hz
,
with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are V-connected and their terminals are directly connected to a 115-kV three-phase bus. The secondary terminals are all shorted together. Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are (a) Y-connected and (b)
Δ-
connected.
The signal x(t) is band-limited to 40 Hz and is modulated with a 320 Hz carrier, which generates y(t). This signal is then processed by a quadratic-law device that produces the output g(t) = y²(t).
a) What is the minimum sampling rate for x(t) that avoids aliasing?b) What is the minimum sampling rate for y(t) that avoids aliasing?c) What is the minimum sampling rate for g(t) that avoids aliasing?
1) Applying the bit mask to toggle the bits in positions 0 through 3 of the register AL, while passing through the bits in positions 7 through 4.What is the binary value of the AL after performing the following two instructions?MOV AL, 10111011 B;XOR AL, mask;
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