Question

3) A three-phase, nozzle, 4-pole cylindrical pole synchronous generator feeds a 400 Volt, 50Hz conversion center. The synchronous reactance of the synchronous generator is 0.72 Ove armature resistance is neglected. The relation between the pole voltage E 'induced in the induction of the synchronous generator and the excitation current, is selected as E, = 824. In this working environment of the synchronous generator,

a.) On the consumer screen, find the excitation current (U), load values, internal phase values, the moment induced in the generator (M.), to provide 54 kW active power, 40kVAr inductive reactive power.

b.) Synchronous generator provides 54 kW active power while its constant losses are 6.48 kW and the excitation circuit losses are neglected.

Answer #1

A submarine has a 3-phase, Y-connected, 2- pole, 60Hz
synchronous generator rated to deliver 1687.5 kVA at a FP = 0.8
lagging with a line voltage of 450-V. The machine stator resistance
RS = 0.004 ?. The synchronous reactance is Xs=0.08 ?. The actual
system load on the machine draws 900 kW at FP = 0.6 lagging. Assume
that a voltage regulator has automatically adjusted the field
current so that the terminal voltage is its rated value. Mechanical
losses are...

(360) Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole -connected
synchronous motor has 0.9Ω synchronous reactance. Friction; wind;
core losses and armature resistance are neglected.
a) If the motor is operating under magnitude of phase current
(ia) (180)
Ampere and power factor of 0.6 lagging,
1. Find the input power of motor in hp
2. Find the generated voltage, EA
3. Find the torque and the maximum inducible torque in current
state.
b) If EA is increased by 18% find,...

410 Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole Triangle
connected synchronous motor has 0.9Ω synchronous reactance.
Friction; wind; core losses and armature resistance are
neglected.
a) If the motor is operating under magnitude of phase current
(ia) 230 Ampere and power factor of 0.6 lagging,
1. Find the input power of motor in hp (10p)
2. Find the generated voltage, EA (10p)
3. Find the torque and the maximum inducible torque in current
state. (10p)
b) If EA is...

A 3-phase, 1.2 MVA, Y-connected, 6.6 KV, 6-poles, 60 HZ,
synchronous generator has a synchronous reactance of 30W and
negligible resistance. The generator is connected to an infinite
bus at 6.6 KV and 60 Hz.
a)Determine the excitation voltage (Ea) when the machine is
delivering rated power at o.8 PF lagging.
b)The field excitation current is increased by 10% without
changing the power input from the prime mover. Find the stator
current (Ia), the power factor and the reactive power...

A three-phase, 9,375 kVA, 13.8 kV, 4-pole, 60 Hz, Y-connected
synchronous generator has a synchronous reactance, Xs = 17.9, and
is connected to an infinite bus at rated voltage. If the rotational
and electrical losses are negligivle, what is Ia, Ef, delta, theta,
Tdrive, Phasor diagram, and power flow diagram (label completely
with numerical values for,
A) the machine as a generator; the prime-throttle is opened and
If is adjusted so that the machine delivers rated kVA, 0.8 pf
lagging,...

A three-phase Wye-connected synchronous generator is rated 3600
rpm, 200kVA, 480V, 60 Hz. The generator’s armature winding
resistance is RA = 0.03Ω and the synchronous reactance
XS is 0.25Ω. The rotational losses are 6kW, the core
losses are 4kW, and the stray losses are 1% of the output real
power. The generator is delivering 200kVA power at 0.85 pf lagging
at rated voltage. Taking the phase voltage at the output as a
reference, answer the following questions.
How many poles...

A 3- phase, 2 pole Y-connected synchronous machines has a
line-line voltage of 6,000V in 60Hz power line, has an armature
reactance of 2ohms/ phase and negligible armature resistance.
Compute the following
A) In case of generating action if the line current is 385 A at
a leading power factor of 0.8, the armature voltage per phase is
3464V, Compute the voltage per phase and power angle.
B) Draw the phasor diagram.
C) If the losses in the machine is...

Please be clear in conceot and handwriting, thank
you.
A 20 kVA three-phase synchronous machine is connected to a 480
V, 60 Hz electrical service.
The per-phase armature reactance is 80%. Armature resistance is
negligible, as are all other sources of power loss.
Part A: Motor Configuration
The machine is configured to run as a motor. Its rated mechanical
power is 20 HP and it is 94% efficient.
The motor provides rated output mechanical power.
The excitation is set such...

A balanced, symmetrical, round-rotor, 3-phase, 60 Hz, 2-pole,
100MVA, 13.8kV, synchronous generator is being driven at
synchronous speed. During tests, an IFNL (field current required to
produced rated terminal voltage under open circuit) of 150A and an
IFSC (field current required to produced rated armature current
under short circuit) of 100A were obtained. Use a linear model and
neglect the armature resistance for the following calculations. a)
What field current is needed to maintain rated terminal voltage
when the generator...

A 4- pole, 50 Hz,
Y-connected, 3-phase generator has a phase voltage of 260 V ∠0°, a
synchronous reactance of 0.06 Ω, a stator resistance of 0.003 Ω,
and Lsf= 0.02 H. The generator is directly connected to a balanced
3-phase load that draws 2 MW at a lagging 0.8 power
factor.
Sketch the
equivalent circuit annotating all the components, currents and
voltages on the diagram
Calculate the
3-phase apparent power of the load in rectangular form
Calculate the
generator...

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