PRODUCTION OF ELECTRICAL ENERGY Questions

Electrical and Electronic Engineering - EEE

Semester: First Semester

Level: 300

Year: 2018

QUESTION I (17 points)

A three-phase, 13.2 kV, 60 Hz, 50 MVA, wye-connected cylindrical-rotor synchronous

generator has an armature reactance of 2.19 Ω per phase. The leakage reactance is 0.137

times the armature reactance. The armature resistance is small enough to be negligible. Also

ignore the saturation. Assume that the generator delivers full-load current at the rated voltage

and 0.8 lagging power factor. Determine the following:

1. The synchronous reactance in ohms per phase (1 pt)

2. The rated load current (4 pts)

3. The air gap voltage (4 pts)

4. The internal generated voltage (4 pts)

5. The power angle (1 pt)

6. The voltage regulation (3 pts)

QUESTION II (13 points)

A three-phase, 100 hp, 60 Hz, 480 V', four-pole, wye-connected, cylindrical- rotor

synchronous motor has an armature resistance of 0.15 Ω and a synchronous reactance of 2 Ω

per phase, respectively. At the rated load and a leading power factor of 0.8, the motor

efficiency is 0.95. Determine the following:

1. The internal generated voltage (6 pts)

2. The torque angle 5 (2 pts)

3. The maximum torque (5 pts)

UNIVERSITY OF BAMENDA

COLLEGE OF TECHNOLOGY

CONTINUOUS ASSESSMENT / PRODUCTION OF

ELECTRICAL ENERGY

Code:EEEP3109 / Time: 2h Pr NFAH / FOTSO

Raoul

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