Calculating Three Phase Power for an Asynchronous Motor-Generator

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SUMMARY

The discussion focuses on measuring three-phase power in an asynchronous motor-generator setup, specifically addressing the power readings from Phase 1 (L1) and Phase 3 (L3). The positive power reading in Phase 1 and the negative reading in Phase 3 are attributed to a high power factor (cos φ). Additionally, it is established that each phase contributes one-third of the total power, allowing for the calculation of power in the second phase (L2) based on the known values from L1 and L3.

PREREQUISITES
  • Understanding of three-phase power systems
  • Knowledge of power factor (cos φ) in electrical engineering
  • Familiarity with asynchronous motor-generator operation
  • Experience with power measurement equipment
NEXT STEPS
  • Research methods for calculating three-phase power using voltage and current measurements
  • Learn about power factor correction techniques in motor applications
  • Explore the implications of negative power readings in electrical systems
  • Study the principles of load balancing in three-phase systems
USEFUL FOR

Electrical engineers, technicians working with motor-generators, and professionals involved in power measurement and analysis in three-phase systems.

jimmynora
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Hi

We are measuring 3 Phase Power of an asynchronous Motor-Generator and have equipment installed on Phase 1 (L1) and Phase 3 (L3) to measure the current/voltage/power. I have some questions regarding the results.

Q) Why is the Power of Phase 1 positive and Phase 3 Negative ?

Q) How can I calculate the power of the second phase (L2) from these results?



Thanks
JN
 
Engineering news on Phys.org
1) Because you probably have an high cos \phi
2) Each phase has 1/3 of the total power.
 

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