Question

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.

Answer #1

A 1200 kVA, 2.3 kV, 3-phase, star - connected alternator has a
resistance of 0.401 /phase and a synchronous reactance of 3.21
/phase. If the generator is supplying a load at a power factor of
0.8 lagging and at rated KVA, calculate the change in line voltage
at the output terminals of the generator if the load is suddenly
disconnected. Assume the speed and the excitation current is to
remain unchanged.

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 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 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.
Question : Draw a Capability curves!

A 125 MVA 11 kV three phase 50 Hz synchronous generator has a
synchronous reactance of 1.33 p.u. The generator achieves rated
open circuit voltage at a field current of 325 A. The generator is
connected to a network with an equivalent line-line voltage of 11
kV and an equivalent impedance of 0.17 pu on the generator base.
The generator is loaded to a real power of 110 MW.
a- Find the generated voltage Eaf in p.u. such that the...

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...

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 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 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) A three phase transformer rated at 30 MVA 10 kV(Δ)/1 kV(Y) is
supplying a load at the low voltage side. The load absorbs 5 MVA,
0.7 power factor lagging at line to line voltage 0.9 kV. The
transformer has an equivalent reactance 0.05 Ω/phase. Assuming 10
MVA and 1 kV as base value, draw the per unit diagram for the
system. Find the Line to Line voltage at the primary side of the
transformer.
b) A three-phase synchronous generator...

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