Electric Machine
A 3-phase, 2300 V, 1000 kVA, 50 Hz, star connected synchronous generator has the following parameters:
p.f.= 0.8 Leading, Poles = 2, Ra / phase = 0.15 Ω, Xs / phase = 1.1 Ω,
PF&W = 24 kW, PCORE = 18 kW, VF = 200 V, IF = 10 A, R F = 20 – 200 Ω
Compute: a) Generated voltage b) Prime mover output c) % age voltage regulation
Approximate power of generator e) Phasor diagram
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A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole,
Y-connected synchronous generator has a synchronous reactance of
XS=0.016 Ω and an armature resistance of RA=0.016 Ω. At rated
conditions the core losses are 7 kW. Friction losses and field
winding losses are 8 kW. Suppose the machine is connected to an
infinite bus (hence the terminal voltage is fixed) and it is
running at the rated conditions.
a) What is the rotor speed in rpm?
b) Calculate the...
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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...
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