Three single-phase two-winding transformers, each rated 3 kVA , 22 0 / 11 0 volts , 6 0 Hz , with a 0.10 per-unit leakage reactance, are connected as a three-phase extended Δ autotransformer bank, as shown in Figure 3.36(c). The low-voltage Δ winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
Three single-phase two-winding transformers, each rated 3 kVA , 22 0 / 11 0 volts , 6 0 Hz , with a 0.10 per-unit leakage reactance, are connected as a three-phase extended Δ autotransformer bank, as shown in Figure 3.36(c). The low-voltage Δ winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
Solution Summary: The author illustrates the positive sequence phasor diagram and proves that high voltage rating is equal to 479.5V.
Three single-phase two-winding transformers, each rated
3 kVA
,
22
0
/
11
0
volts
,
6
0
Hz
,
with a 0.10 per-unit leakage reactance, are connected as a three-phase extended
Δ
autotransformer bank, as shown in Figure 3.36(c). The low-voltage
Δ
winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
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Choose the correct answer:
1. In AM, 50% modulation indicates that
33.3%.11.1%).
of the total transmitted power is in the sidebands (0%,50%
2. To obtain coherent detection in AM receiver, an extra signal is added to the modulated signal, this signal
called
(PLL, IF carrier, pilot carrier, subcarrier).
3. The output spectrum of a
modulator includes upper-side, lower-side frequencies, and the carrier
frequency. (balanced, standard amplitude, SSB, none of the above)
4. When a signal is multiplied by the unit step function,
(the positive time range is suppressed, the
negative frequency range is suppressed, the negative time range is suppressed, the positive frequency range
is suppressed).
5. DSB-LC requires coherent detection at the receiver, if the type of modulation is
modulation, over modulation, critical modulation, none of them).
6. A continuous FT indicates a
7. In VSB transmission
signal. (continuous,…
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Chapter 3 Solutions
MindTap Engineering, 1 term (6 months) Printed Access Card for Glover/Overbye/Sarma's Power System Analysis and Design, 6th
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