Is 3 Phase Power Essential for a Complete Education in Electrical Engineering?

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Discussion Overview

The discussion revolves around the importance of 3 phase power in the education of Electrical Engineering students, particularly focusing on whether it is essential for a comprehensive understanding of the field. Participants explore the relevance of 3 phase power in practical applications, such as motors, and seek resources for further learning on the topic.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses concern that their Electrical Engineering program has not covered 3 phase power, questioning its necessity for a solid education in the field.
  • Another participant asserts that 3 phase power is important, noting that most large motors in buildings operate on a 3 phase basis and that understanding phase relationships is key.
  • A participant seeks clarification on 3 phase power analysis and whether it involves connecting three out-of-phase sources to a node.
  • One participant corrects a previous claim about the phase relationship, stating that in the U.S., the phases are 120 degrees out of phase, not 90 degrees.
  • A later reply elaborates on the operation of 3 phase systems, mentioning Wye and Delta configurations and their relevance to industrial motors.
  • Participants discuss the need for clear resources on 3 phase circuit analysis, indicating a desire for detailed explanations without skipped steps.

Areas of Agreement / Disagreement

Participants generally agree on the importance of 3 phase power in the context of Electrical Engineering, particularly regarding its application in motors. However, there is no consensus on the necessity of covering it in educational programs, as some participants question the adequacy of their current curriculum.

Contextual Notes

Some limitations in the discussion include the lack of specific resources mentioned for studying 3 phase power analysis and the varying levels of familiarity with the topic among participants. The discussion also reflects differing perspectives on educational priorities in Electrical Engineering.

Who May Find This Useful

Electrical Engineering students, educators in engineering programs, and professionals interested in the applications of 3 phase power in industrial settings may find this discussion relevant.

samdunhamss
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Hello, I am an Electrical Engineering student taking my second circuit analysis course. My program is actually very good and they explain things very well. My main concern is that none of my courses have covered or much less mentioned 3 phase power. My first question is simple: Are they skimping out on something that is imperative to a good education in the field of Electrical Engineering? My second question: Is there a good source that explains this concept in a clear and accessible manner?
A little background - I am well versed in calculus and differential equations and have a strong grasp on single phase power analysis. Despite this, I need material that explains the concept in explicit detail, I strongly dislike steps being skipped.

Any and all responses are greatly appreciated.
 
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Of course 3 phase is important, basically every large motor in any building is a 3 phase motor. Elevators, HVAC, etc. If you have a good foundation on AC, all you need to know is the phases lead/lag each other by 90 degrees. Are you asking how a 3 phase motor works? Motors are the main reason you use 3 phase.
 
More than anything I'm curious about three phase power analysis. I knew motors operate on a polyphase basis. I guess I was just curious if there is a good text which covers circuit analysis with three phases? or would it be like have three sources out of phase with one another connected to a node?
 
3 phase in the U.S. operates with the three phases 120 degrees out of phase, not 90.
 
Averagesupernova is 100% correct, my mistake. If you draw out 3 sin waves 120 degrees apart you will see that they would maintain a stable rotation in a motor with poles 120 degrees apart as well.

connecting 3 phases to a node would be Wye operation, you would be well served to study Delta operation also. Industrial motors perform mostly in Delta. A frequency driven or soft start type motor is usually running in Delta. Older contactor run motors usually spin up in wye, then transfer to delta. You probably already knew this, but I figure it's worth mentioning. I wish I could be more help as to a source for analysis.
 

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