A 3 phase 11 kv,25 mva, 60 Hz salient pole synchronous motor is
running from a...
A 3 phase 11 kv,25 mva, 60 Hz salient pole synchronous motor is
running from a 11 Kv, 60 Hz balanced three phase supply the
meachince reactances are Xd=1.2 pu and Xq=0.6 pu ,neglect the
meachanicalloss and armature copper loss the maximum power input is
obtained with no field excitation determine the power factor of
motor
A 3-phase, 40 MVA, 13.8 kV, 60 Hz, ?-connected alternator
requires field current of 250 A...
A 3-phase, 40 MVA, 13.8 kV, 60 Hz, ?-connected alternator
requires field current of 250 A to produce an open circuit rated
voltage while a field current of 150 A is required to produce short
circuit rated armature current. Neglect armature resistance.
Determine the Synchronous Reactance (Xs).
A three-phase, 9,375 kVA, 13.8 kV, 4-pole, 60 Hz, Y-connected
synchronous generator has a synchronous reactance,...
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,...
Determine the kinetic energy stored by a 300 MVA, 60 Hz, two
pole synchronous generator with...
Determine the kinetic energy stored by a 300 MVA, 60 Hz, two
pole synchronous generator with an inertia constant H of 5.66
MJ/MVA. Assume the machine is running steadily at synchronous speed
with a shaft input of 366000 hp. The electrical power developed
suddenly changes from its normal value to a value of 200 MW. a.
Determine the acceleration or deceleration of the rotor. b. If the
acceleration computed for the generator is constant for a period of
10 cycles,...
A 3-phase, 1.2 MVA, Y-connected, 6.6 KV, 6-poles, 60 HZ,
synchronous generator has a synchronous reactance...
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 75-kW, 440-V, 0.8-PF-leading Y-connected synchronous generator
has an armature resistance of 0.22 Ω and a...
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?
A 20kW. 3-phase, +40 V. 4 pole, delta-connected permanent magnet
synchronous motor has following parameters Xs=5...
A 20kW. 3-phase, +40 V. 4 pole, delta-connected permanent magnet
synchronous motor has following parameters Xs=5 ohm, Rs
negligible rated power factor = 1.0. Machine is
controlled by variable frequency control at a constant (V/f) ratio.
Calculate
(i) Armature current. torque angle and power factor at half full
load torque and 750 rpm.
(ii) armature current, torque angle and power factor at half
full load torque and 1000 rpm.
(iii) The braking torque, torque angle and power factor when
working under...
A 3- phase, 2 pole Y-connected synchronous machines has a
line-line voltage of 6,000V in 60Hz...
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...