Homework Answers
The conditions for parallel operation and their explanation is given below also phasor diagram and emf calculation.
Add Answer to:
4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
1. A three-phase, 5 kVA, 208 V, four-pole, 60 Hz, wye-connected synchronous machine has...
A three-phase, 5 kVA, 208 V, four-pole, 60 Hz, wye-connected synchronous machine has negligible stator winding resistance and a synchronous reactance of 8 Wper phase. It is operated in parallel with a three-phase, 208 V, 60 Hz power supply.Determine the excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 pf lagging. Draw the phasor diagram
[12 marks] 2.(30 marks] a) Description of Core Loss in synchronous generator. When does the loss ...
[12 marks] 2.(30 marks] a) Description of Core Loss in synchronous generator. When does the loss occur? [6 marks] b) A 3 phase, 2 poles, 4.16 kV, wye-connected synchronous generator with 50 Hz is applied as an emergency power source to supply 500 kW at a power factor of 0.9 lagging. The stator resistance is 0.3 Q/phase. Rotational losses in the machine are estimated to be 15 kW. Determine the required horsepower and torque of the prime mover. [12 marks]...
A 3φ, 14 kV, 10 MVA, 60 Hz, 2-pole. 0.85 PF lagging, wye-connected, synchronous generator has...
A 3φ, 14 kV, 10 MVA, 60 Hz, 2-pole. 0.85 PF lagging, wye-connected, synchronous generator has X-20 Ω per phase and Ra 2 Ω per phase. The generator is connected to an infinite bus (a) (i) Determine the excitation voltage at the rated condition (ii) Draw the phasor diagram for the condition (b) Determine the torque angle at the rated condition (c) If the field current is kept constant, determine the maximum power the generator can supply (d) (i) For...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.5Q/phase and a...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
b) A 1MW, 3300 V, 50 Hz, wye-connected, 3-ф, twenty four-pole, synchronous motor has a synchronous...
b) A 1MW, 3300 V, 50 Hz, wye-connected, 3-ф, twenty four-pole, synchronous motor has a synchronous reactance of 3.24 2 per phase. Assume armature resistance is negligible. This machine is connected to an infinite bus-bars at 3300 V. Its field excitation is adjusted to provide P.F-1 at rated load Calculate: 0 the internal generated voltage EA and armature current la at rated conditions (S marks) ii) the maximum power and torqu e that the motor can deliver with its Ir...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
Problem 2 A 15 HP, 96% efficient, three-phase Wye-connected synchronous motor is connected to a 4...
Problem 2 A 15 HP, 96% efficient, three-phase Wye-connected synchronous motor is connected to a 480 VAC, 60 Hz power supply. The field excitation is set such that the power factor is 0.97 leading. The machine draws 9 kW from the supplv. The per-phase armature reactance is 9500. Find the internally generated voltage, E, Calculate the motor torque angle, δ. Draw the phasor diagram, showing Vn E, XsL, IA ,Θ and δ. a. b. c.
Problem 2 A 15 HP,...
A three-phase synchronous generator with rated data VM = 20 kV, SM = 100 MVA, n...
A three-phase synchronous generator with rated data VM = 20 kV, SM = 100 MVA, n = 500 rpm is driven by a turbine that can provide a maximum of 1.6 MNm. Synchronous reactance, XS = 3Ω / phase. The armature resistance (Ra ) is neglected. In open circuit mode (P = 0), an excitation current of 300 A is required to obtain rated voltage (VM ). The machine should be phased into a strong grid, 3x20 kV, 50 Hz....
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utili...
please show steps. Thank you.
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utility) bus to deliver power to a 2000 kw plant load at 0.866 lagging power factor. The synchronous generator is wye-connected and rated 3750 kva, 13.2 kv, and 0.8 power factor lagging with 1.0 per unit synchronous reactance and negligible armature resistance. 13.2 kVI 60 Hz I infinite bus utility) rated: 3750 kva 0.8 lag load: 2000 kW...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
[12 marks] 2.(30 marks] a) Description of Core Loss in synchronous generator. When does the loss occur? [6 marks] b) A 3 phase, 2 poles, 4.16 kV, wye-connected synchronous generator with 50 Hz is applied as an emergency power source to supply 500 kW at a power factor of 0.9 lagging. The stator resistance is 0.3 Q/phase. Rotational losses in the machine are estimated to be 15 kW. Determine the required horsepower and torque of the prime mover. [12 marks]...
A 3φ, 14 kV, 10 MVA, 60 Hz, 2-pole. 0.85 PF lagging, wye-connected, synchronous generator has X-20 Ω per phase and Ra 2 Ω per phase. The generator is connected to an infinite bus (a) (i) Determine the excitation voltage at the rated condition (ii) Draw the phasor diagram for the condition (b) Determine the torque angle at the rated condition (c) If the field current is kept constant, determine the maximum power the generator can supply (d) (i) For...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
b) A 1MW, 3300 V, 50 Hz, wye-connected, 3-ф, twenty four-pole, synchronous motor has a synchronous reactance of 3.24 2 per phase. Assume armature resistance is negligible. This machine is connected to an infinite bus-bars at 3300 V. Its field excitation is adjusted to provide P.F-1 at rated load Calculate: 0 the internal generated voltage EA and armature current la at rated conditions (S marks) ii) the maximum power and torqu e that the motor can deliver with its Ir...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
Problem 2 A 15 HP, 96% efficient, three-phase Wye-connected synchronous motor is connected to a 480 VAC, 60 Hz power supply. The field excitation is set such that the power factor is 0.97 leading. The machine draws 9 kW from the supplv. The per-phase armature reactance is 9500. Find the internally generated voltage, E, Calculate the motor torque angle, δ. Draw the phasor diagram, showing Vn E, XsL, IA ,Θ and δ. a. b. c.
Problem 2 A 15 HP,...
please show steps. Thank you.
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utility) bus to deliver power to a 2000 kw plant load at 0.866 lagging power factor. The synchronous generator is wye-connected and rated 3750 kva, 13.2 kv, and 0.8 power factor lagging with 1.0 per unit synchronous reactance and negligible armature resistance. 13.2 kVI 60 Hz I infinite bus utility) rated: 3750 kva 0.8 lag load: 2000 kW...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago