A 1,500 kVA, 3-phase alternator is connected to an infinite busbar at constant voltage of 11,000...
- A 1,500 kVA, 3-phase alternator is connected to an infinite busbar at constant voltage of 11,000 volts. The resistance and reactance per phase are 0.10 ohm and 2.4 ohms respectively. Find (a) the maximum external load that the machine can supply when the machine is excited to give an emf of 12,500 volts, (b) the current and pf at the maximum output.
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A 1,500 kVA, 3-phase alternator is connected to an infinite
busbar at constant voltage of 11,000...
1- A 25-kVA, 3-phase, wye-connected, 400-V alternator has a synchronous reactance of 1.6 ohms per phase....
1- A 25-kVA, 3-phase, wye-connected, 400-V alternator has a synchronous reactance of 1.6 ohms per phase. The alternator is to have zero voltage regulation at half-load. Neglecting the armature resistance, find the operating power factor and the developed power 2. A 500-kVA, 3600-V, 3-phase, 60-Hz alternator has an effective armature resistance per phase of 0.40 ohm Mechanical and iron losses is 10 kW, field current at full load unity power factor is 70 A. The exciter voltage is constant at...
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A wye-connected 200 kVA, 440 V, 3-phase alternator yields 150 V between the terminals on short circuit. With the field excitation unchanged, the short circuit current is 300 A. The ohmic resistance of this machine between line terminals is 0.10 ohm and the ratio of the effective to ohmic resistance is 1.25. Calculate the full load terminal voltage of the machine when the excitation is adjusted to yield a no-load of 500 volts between lines and the power factor is...
A 25-kVa, 3 phase , wye connected, 400 V alternatorr has a synchronous reactance of 1.6...
A 25-kVa, 3 phase , wye connected, 400 V alternatorr has a synchronous reactance of 1.6 ohms per phase. the alternator is to have zero voltage at half load. neglecting the armature resistance, find the operating power factor and developed power
A 400 v, 50 Hz, three phase alternator, rated at 75 kVA, is star connected and...
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A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resis...
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2. Two alternators A and B are operating in parallel to supply power to a load 1000 kVA at 0.8 pf laggine alternator A contributes 500 KVA at 0.6 of ageing calculate the real power and power factor o...
2. Two alternators A and B are operating in parallel to supply power to a load 1000 kVA at 0.8 pf laggine alternator A contributes 500 KVA at 0.6 of ageing calculate the real power and power factor of & iS points) 3. A 440 V, 4-pole, 60 Ht, 3-phase wye-connected induction motor runs at 1700 rpm during the normal operation. The motor has the following data; (20 polets X, 1.2 ohms 0.89 ohms X -0.56 ohms Ra 025 ohmg...
A 60 Hz, balanced three-phase source is connected to a balanced load of 2815 kVA at...
A 60 Hz, balanced three-phase source is connected to a balanced load of 2815 kVA at 0.95 pf lagging through a short transmission line with negligible resistance and a series inductive reactance of 13 12. The load is operated at 25 kV. Compute: (a) the line current magnitude (b) the line voltage magnitude at the source (c) the line-to-neutral source voltage (d) the power factor of the source
A 50-kVA, 13,800/208-V, Delta to Wye connected distribution transformer has an equivalent resistance of 3 percent...
A 50-kVA, 13,800/208-V, Delta to Wye connected
distribution transformer has an equivalent resistance of 3 percent
and a reactance of 9 percent per unit.
(a) what's the transformers phase impedance referred to the high
side voltage?
(b) what's the transformers voltage regulation at full load and 0.9
PF leading?
equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resistance and Xs-60/phase at rated terminal voltage The machine first runs as a generator in parallel with 3-phase, 400 V, 50 Hz power supply 111 Determine the generated voltage and torque angle of the machine operating as a generator, delivering rated kVA at 0 9 pf lagging Draw and label the corresponding phasor diagram for this condition 1 12 If the field excitation is increased by 18%...
2. Two alternators A and B are operating in parallel to supply power to a load 1000 kVA at 0.8 pf laggine alternator A contributes 500 KVA at 0.6 of ageing calculate the real power and power factor of & iS points) 3. A 440 V, 4-pole, 60 Ht, 3-phase wye-connected induction motor runs at 1700 rpm during the normal operation. The motor has the following data; (20 polets X, 1.2 ohms 0.89 ohms X -0.56 ohms Ra 025 ohmg...
A 60 Hz, balanced three-phase source is connected to a balanced load of 2815 kVA at 0.95 pf lagging through a short transmission line with negligible resistance and a series inductive reactance of 13 12. The load is operated at 25 kV. Compute: (a) the line current magnitude (b) the line voltage magnitude at the source (c) the line-to-neutral source voltage (d) the power factor of the source
A 50-kVA, 13,800/208-V, Delta to Wye connected
distribution transformer has an equivalent resistance of 3 percent
and a reactance of 9 percent per unit.
(a) what's the transformers phase impedance referred to the high
side voltage?
(b) what's the transformers voltage regulation at full load and 0.9
PF leading?
equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
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