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  3. a synchronous generator has parameters as shown in

A synchronous generator has parameters as shown in table below. 1. Voltage Rating 30 kV, 3-phase 5. Frequency 50 Hz 2. Power Rating 50 MVA 6. Rotor Round 3. Synchronous Reactance, XS 7...

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Electrical Engineering

A synchronous generator has parametersas shown in table below.

1.

Voltage Rating

30 kV, 3-phase

5.

Frequency

50 Hz

2.

Power Rating

50 MVA

6.

Rotor

Round

3.

SynchronousReactance,

XS

7 Ω /phase

7.

Connection

STAR

4.

Armature resistance,Ra

1.5 Ω /phase

8.

Excitation Type

Permanent Magnet

  1. An inductive load of 30MW at 0.8 power factorat rated terminal voltage is connected to the synchronous generatorto an infinite bus. Determine the excitation voltage perphase and its corresponding power angle.Sketch a phasor diagram for this condition.?
  2. With reference to (a), without losing synchronism, what will bethe maximum power the generator will be
    able to deliver? Also, determine the armaturecurrent at this condition.?
  3. Turbine torque is reduced until generator output is 15MW whileexcitation is held constant as in (a) above,
    determine the power angle, armature current, and powerfactor.?
  4. If now the load has changed to a rated powerat rated voltage load, with a leading power factorof 0.8,
    determine the percentage voltage regulation ofthis generator.?

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