Q1. a) Explain why it is necessary to have reverse power protection for alternators intended for operation. (8)
b) (i) Sketch a reverse power trip. (4)
(ii) Briefly explain the principle on which the operation of this power trip is based and how tripping is activated. (4)
Q2. A. Describe a brush less alternator with a.c. exciter static A.V.R. (8) B. State the output voltage characteristics for this type of machine. (8)
Q3. Which of the following devices will prevent a DC generator from becoming motorized? (8)
a) Over current relay.
b) Motorization trip.
c) Reverse power relay.
d) Reverse current relay.
(b) Give a detailed explanations as to why other options were not considered. (8)
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