Question

A synchronous generator 480-V, 50-Hz, Y-connected, six-pole has a power rating of 50 kVA at pf 0.8 lagging. The synchronous Reactance Generator is 1.0 Ω per-phase. This Generator is connected to the 45 kW steam turbine. The friction loss and the core generators are respectively 1.5 kW and 1.0 kW.

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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,...

The 400 V, 50 kVA, 0.8 power factor leading delta connected
synchronous motor has synchronous reactance of 3-ohm, resistance
neglected. It is supplying a 12-kW load with initial power factor
of 0.86 lagging. The windage and friction losses are 2.0 kW and the
core losses are 1.5 kW. Determine
(a) the motor efficiency; the line current; armature current;
and excitation voltage.
(b) If the flux of the motor is increased by 20 percent
determine the excitation voltage; armature current; and...

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...

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...

A 42 kVA three-phase synchronous generator with line voltage
4.16 kV at a frequency of 60 Hz, is connected in star
configuration. The generator has a winding whose armature
resistance is 0.8 Ω and a synchronous reactance of 7.4 Ω, both per
phase. Determine the voltage regulation when the power factor is
0.600 lagging.

A 50-Hz, two-pole, 825 kVA, 2300 V, three-phase synchronous
machine has a synchronous reactance of 7.47 and achieves rated
open-circuit terminal voltage at a field current of 147 A.
c. For a constant load power of 700 kW, write a MATLAB script to
plot the terminal current as a function of field current. For your
plot, let the field current vary between a minimum value
corresponding to a machine loading of 825 kVA, leading power
factor, and a maximum value...

A 75-kW, 440-V, 0.8-PF-leading Y-connected synchronous generator
has an armature resistance of 0.22 Ω and a synchronous reactance of
3.0 Ω. Its efficiency at full load is 89% (1 Hp=746 watt).
(a) What is the line current of the generator at rated
conditions?
(b) What is the internal generated voltage EA of this motor at
rated conditions?

(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 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...

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