If two alternators are operating in parallel, what will change if each alternator's field excitation is changed in opposite directions (one alternator's field current increasing, while the other is decreasing)?
• Effect of field excitation on alternator terminal voltage and power factor • Difference between active (real) power and reactive power sharing when generators are in parallel • Role of speed/governor vs excitation in controlling generator outputs
• When two alternators are in parallel and you change only the field currents (not the governors), which quantity are you actually controlling: voltage, frequency, or something else? • Which type of power (active vs reactive) is mainly influenced by field excitation and power factor? • Does changing excitation in opposite directions make sense for changing frequency, or does that more directly affect how the load’s reactive component is shared between machines?
• Confirm that frequency and phase sequence are primarily controlled by prime mover speed and connection, not excitation • Recall that active (real) power sharing is mainly adjusted with governor/speed setting, not field current • Verify that changing field excitation alters terminal voltage and reactive power flow between paralleled alternators
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