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As you asked the question and it was added it to the electrical category I am presuming that you are talking about electrical generation. The prime mover has to be kept at a constant speed. The speed of the prime mover governs the frequency of the voltage generated. As the load increases the engine will start to slow down. The engine's speed governor senses this drop in RPM, hence the drop in frequency, and increases the fuel supply to the engine by advancing the diesel engine's fuel rack. This action increases the engine speed and brings the generated frequency back to the required system frequency.

Also as the load increases, the output voltage will start to decrease. The output voltage is controlled by the generator's voltage regulator. When the decrease in voltage is sensed by the voltage regulator, it increases the generator's field excitation voltage which will bring the voltage back to the required system voltage.


These actions are going on continuously, balancing each other all the time the engine is running and the generator is producing an output voltage.

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βˆ™ 9y ago
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βˆ™ 9y ago

I believe it is related to generator - if the prime mover speed is not constant, the frequency and voltage may not be constant

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βˆ™ 9y ago

I believe it is related to generator - if the prime mover speed isnot constant, the frequency and voltage may not be constant

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Q: Why should a prime mover's speed be kept constant?
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