Question

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, determine the change in the power angle in that period. c. The rpm at the end of 10 cycles.

Answer #1

A two-pole Y-connected generator rated at 13.8 kV, 20 MVA, 0.8
p.f. leading is running at 1800 rpm. The generator has a
synchronous reac- tance of 8 Ω per phase (at 60 Hz) and a
negligible armature resistance per phase. The generator is operated
in parallel with an interconnected power network. Compute the
following:
(i) What is the torque angle of the generator at rated
conditions?
(ii) How many MW of power this generator can deliver?

A 54-slot stator of a synchronous generator is wound for
three-phase, 50-Hz, 6-pole applications. Determine (a) the number
of coils in a phase group, (b) the slots per pole, (c) the slot
span,(d) the coil span, and (e) the speed at which the rotor must
be rotated.

A three-phase 55 Hz, 500 MVAR, 11.8-kV, 6 pole steam turbine
generating unit has an H constant of 5 p.u. Determine a)
synchronous mechanical and electrical angular frequencies, b)
Consider the damping is ignored and the initial rotor angular
position is 30 degrees. Find the electrical and mechanical rotor
angular position in radians after three cycles if the mechanical
power is 1 p.u. and the generator rotates at synchronous speed. C)
The unit is operating at Pm=1 and the synchronous...

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 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 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 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...

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