Electrical Engineering › Section M · Transformers and polyphase systems › Topic M.6
Polyphase systems and the three-phase generator
Nearly every power station generates three sinusoidal voltages at once, spaced a third of a cycle apart. This topic shows how a generator produces them, why three phases beat one, and how the three voltages always add to zero.
In this topic
- From one phase to several
- Why three phases?
- Inside the generator
- Frequency, poles and speed
- Worked example: poles and speed
- The three voltages and the ABC sequence
- Worked example: the instantaneous sum is zero
- Phasors that close a triangle
- Constant power from three phases
- Common mistakes to avoid
- Key takeaways
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