Why do we use 1 phase and 3 phase power supply only and why not other than this?

Forums Common electrical queries Why do we use 1 phase and 3 phase power supply only and why not other than this?

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    imran ahmed
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    Why do only single phase and three phase power supplies are available everywhere? And why not other than this, such as 2 phase or 4 phase supply?

    #250
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    Kiran Daware
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    There are many advantages of using three phase power, such as –

    • Constant Power: Three phase power delivered to a resistive load is perfectly constant at all the times. That means, not even minor fluctuations and vibrations.
      Net power in all three phases,
      P = sin2θ + sin2(θ – 2π/3) + sin2(θ – 4π/3) = 1.5
      Single phase, two phase or four phase system etc. will have a sinusoidal component in the resultant power. Thus, vibrations and fluctuations are introduced.
    • Low neutral current: In case of a balanced system, no neutral current flows, hence no neutral wire is required. With non-linear or unbalanced loads, the neutral current in three phase system is very low. So, size of the neutral conductor is practically reduced.
    • Higher phases will require more number of conductors: Since, three phases can give a constant power, who would you go for higher phases when you will require increased number of conductors for transmission?
    • Easily get single phase supply: Three phase power supply is used for transmission and distribution. It is very easy to obtain single phase supply by taking connection from any one phase and the neutral.
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