Drawing vectors according to the phase

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SUMMARY

This discussion focuses on the method of drawing vectors in the analysis of unbalanced three-phase power systems, specifically addressing the challenges of representing the phase currents Ib and Ic. The user successfully understands how to draw the vector for Ia but struggles with the coefficients and the correct positioning of Ib and Ic. The process involves placing vectors head to tail, starting from the origin, to accurately depict the resultant vector sum. Clarification on the use of subscripts and coefficients is essential for proper vector representation.

PREREQUISITES
  • Understanding of three-phase power systems
  • Familiarity with vector addition techniques
  • Knowledge of phase current notation (Ia, Ib, Ic)
  • Basic grasp of electrical engineering principles
NEXT STEPS
  • Study the principles of vector addition in electrical engineering
  • Learn about the coefficients affecting phase currents in three-phase systems
  • Research graphical methods for representing three-phase power systems
  • Explore software tools for simulating three-phase power analysis
USEFUL FOR

Electrical engineers, students studying power systems, and professionals involved in analyzing unbalanced three-phase power systems will benefit from this discussion.

aruwin
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Hi! Ok, I got another question here. I don't understand how to draw the vectors. This is a method to simplify analysis of unbalanced three-phase power systems but I just don't understand the drawing here. Do you think you can explain how? I understand how to draw the vectors for Ia, but not for Ib and Ic. For Ia it's really easy, just draw all of them according to the phase but for Ib and Ic, they seem a little different. I know it's got something to do with the coefficients in the equation but I don't know how to draw according to that, though.
 

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I am having trouble reading the subscripts - about the only one I can discern for certain is Ia but the drawing is adding (or subtracting) vectors. The vectors to be summed are placed with one starting at the origin and all the others head to tail (the origin of the second vector is at the head of the 1st vector); then a vector drawn from the origin to the head of the last component vector is the sum.
 
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