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# A 13 kV, 40-MVA, 0.8-power-factor-lagging, 60-Hz, 8-poles Y-connected synchronous generator has a synchronous reactance of 2.5 2 and an armature resistance of 0.2 2. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a de voltage of 120 V, and the maximum field current is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A.

1. Draw the open circuit characteristics [OCC] for this generator. Assume that this

characteristics is represented by the following relation:

2. Draw the short circuit characteristics [SCC] for this generator. Assume that this characteristics is represented by the following relation:

I(If) = 35If,

3. Draw the synchronous impedance (Xs) of this generator as a function of the armature current.

4. Draw the per phase equivalent circuit of the 3-Phase synchronous generator.

5. Draw the terminal voltage (V₁) versus the armature current (1) of this generator up to the rated load current for the following cases [One graph]:

A. Rated MVA with 0.8-PF-lagging load.

6. Draw the voltage regulation (VR) versus the armature current (I) of this generator up to the rated load current for the following cases [One graph]:

A. Rated MVA with 0.8-PF-lagging load.