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#Skillclient alt generator full#
#Skillclient alt generator generator#
When the generator operates at a lagging power factor, the voltage drop takes place in both armature resistance and armature reactance. Alternator Operating at lagging Power Factor Thus, an alternator has a small positive voltage regulation when it operates at a unity power factor. The voltage regulation at the unity power factor is Therefore, the terminal voltage is slightly less than the induced EMF of the generator.
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When a generator operates at a unity power factor, the voltage drop takes place in the armature resistance only. Alternator Operating at unity Power Factor And, you will find that the power factor is 0.8 to 0.85(lag) engraved into the nameplate of the generator. Generally, an alternator delivers power to the load that is inductive in nature. On the other hand, the power factor of inductive load and capacitive load is lagging and leading respectively. The power factor of the pure resistive load is unity. The type of load may be a combination of resistive, inductive, and capacitive types. The generator delivers the power to electrical loads, resistive, inductive, and capacitive. How does the regulation depend on the load power factor? However, it is not possible to design an ideal alternator. The ideal generator has zero voltage regulation. It is desirable to have the voltage regulation as much smaller as possible because a higher value of voltage regulation causes lower efficiency and the deterioration of the machine’s performance. The percentage voltage regulation formula is given below,
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Per unit voltage regulation of the alternator is given below. Formula of Voltage Regulation of Alternator Per Unit Voltage Regulation Formula: In other words, the change in the terminal voltage from no-load to rated full load divided by full load rated voltage is called voltage regulation of the alternator. The voltage regulation shows the degree of variation in the terminal voltage of the generator with increased loading. Thus, in this condition, the terminal voltage is equal to the induced EMF. When the generator is at no load, the armature current becomes zero and the armature reaction does not happen. And, this increase in armature current causes a voltage drop in the induced EMF because of the armature reaction and voltage drop in the resistance and reactance of the alternator. Also, the armature current increase with an increase in load. The terminal voltage decreases with an increase in load. The fact is that the terminal voltage does not remain constant on increasing load on the generator. When the generator is at no load, the terminal voltage will be more, it is equal to induced EMF in the armature. The voltage regulation of an alternator or synchronous generator is defined as the change in the terminal voltage of the generator on the application of load when the speed and the field current(excitation) remain constant.