Alternator run at zero power factor lagging

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SUMMARY

This discussion centers on the feasibility of operating an alternator at zero power factor lagging, which is characterized by purely inductive behavior. The user attempted to achieve this by shorting the alternator leads but could only shift the phase angle between voltage and current to 45°, despite increasing the excitation current. The conversation highlights the challenges posed by the resistance of the stator winding and the inherent real losses in passive components, suggesting that achieving a purely inductive state may not be possible.

PREREQUISITES
  • Understanding of alternator operation and power factor concepts
  • Knowledge of excitation current and its effects on alternator performance
  • Familiarity with oscilloscopes for measuring voltage and current waveforms
  • Basic principles of inductive and resistive loads in electrical systems
NEXT STEPS
  • Research methods to measure phase angle using oscilloscopes
  • Explore the effects of stator winding resistance on alternator performance
  • Investigate techniques for achieving low power factor operation in alternators
  • Learn about reactive power management in electrical systems
USEFUL FOR

Electrical engineers, power system analysts, and anyone involved in the design or optimization of alternator performance and power factor management.

electricalguy
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Hello, I'm wondering if it's possible to make an alternator run at zero power factor lagging (purely inductive). I was researching this topic and apparently by shorting the leads of the alternator the output will become fully reactive. Yet I've attempted this on a small scale and the most I can get the phase between voltage and current to shift is 45°. I've increased the excitation current without a change in the phase angle. Is there something I'm missing? Is there a way I can make the alternator run purely inductive? I understand lagging power factor is demagnetizing, leading power factor is magnetizing and unity power factor is cross magnetized. Is the issues with the resistance of the stator winding?
 
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In reality - I doubt this is possible with passive components as there will always be real losses.

If you are shorting the output - how are you measuring the voltage in taking the PF?
 
I'm using an oscilliscope to take measurements of the line voltage and the phase current. I used a 14 gauge wire to connect the phases together. I measure the current waveform across the 14 gauge wire. I measure the difference in time between the voltage and current waveforms in milliseconds, then divide by one AC cycle in milliseconds, then multiple by 360 and this gives me the phase angle between the two in degrees.
 

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