An auxiliary engine exhibits a tendency to hunt to such an extent that the engine speed variation prohibits the connection of the machine to the switchboard.
a) Discuss the possible causes of hunting.(8)
b) Explain how the problem of hunting can be rectified.(8)
Reference Answer
### Definition of Hunting Hunting is an undesirable condition where the engine speed oscillates continuously above and below the set speed. This instability is typically caused by the governor over-correcting for speed changes. When severe, as described in the question, it prevents the safe synchronization and connection of the alternator to the main switchboard, as the fluctuating frequency would cause large synchronizing currents, potentially leading to a reverse power trip or severe damage to the alternator and prime mover. ### a) Possible Causes of Hunting The causes of hunting can be systematically categorized into three main areas: the governing system, the fuel system, and engine mechanical faults.
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