Three Phase Generator: Knowledge Sharing

  • Context: Undergrad 
  • Thread starter Thread starter Jozef Trulik
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Discussion Overview

The discussion revolves around the operation of three-phase generators, specifically focusing on the return path of current to the generator and the concept of phasors in three-phase systems. Participants explore different configurations, such as wye and delta connections, and the implications of grounding.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the exact return path of current in a three-phase generator and the meaning of the equation I1 + I2 + I3 = 0.
  • Another participant explains that in a grounded wye-connected system, return current typically flows through the ground in cases of phase unbalance.
  • A follow-up question asks what the return path is when the system is not grounded.
  • It is noted that in a delta arrangement, the absence of a return path can lead to variations in phase voltages, complicating the understanding of the system compared to the wye configuration.
  • A later reply affirms the previous explanation, highlighting the difficulty in visualizing the delta arrangement.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the return path of current in ungrounded systems, indicating multiple competing views and unresolved questions regarding the operation of three-phase generators.

Contextual Notes

Limitations include the lack of clarity on specific conditions under which the return paths operate and the implications of grounding or ungrounding in different configurations.

Jozef Trulik
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Dear all,
please could you share with me your knowledge about three phases generator? I would like to know exactly how current flow back to generator. For example what is exact way of current from generator (1). What line is using as return path for it. And also do not know how it is possible that phasors I1 + I2 + I3 = 0.

Thank you very much.
 

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The center of your wye-connected system is typically grounded, in which case the return current would flow through the ground if there is a phase unbalance.
 
Dear DR.D,
as you wrote: this system is "typically" grounded. But which return path is using when it is not grounded? Thank you
 
In the absence of a return path (which is how a delta arrangement works) any impedance will result in a variation in the voltages in the three phases - the 'ground' will shift away from 0V. It's a bit harder to picture than the wye system.
 
sophiecentaur has given you the correct answer, including the part about "It is a bit harder to picture."
 

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