why electrical power is generated,transmitted and distributed as three phase power?

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  • 7 years ago
    Favorite Answer

    The transmission of power could be achieved by one phase but with three phases it requires fewer conductors. One phase would need a go and a return conductor. The three phase system needs only three "go" conductors. Since the currents are out of phase the current transported by one is returned in the others at every instant. So each conductor serves both as go and return. Moreover with a balanced three phase system, power flow is totally constant in time. It would be fluctuating at 100 Hz in a 50Hz single phase system. Such unsteady power flow and changing magnetic fields would make generator design much more difficult. Large generators would shake themselves to pieces due to the torque vibrations. It would greatly affect shafts and turbines too. So, although most* end consumers see little or no difference, the three phase (balanced) system makes large scale power generation and transmission feasible and greatly enhances its economics

    * Motors do benefit by being of 3 phase design. They start very simply and run extremely smoothly (again due to the constancy of the power supply and torque)!.

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  • BIG Al
    Lv 5
    7 years ago

    Three Phase Power is more efficient because power stations generate power in three phase.

    Therefore it is convenient.

    Is is also more efficient than single phase power because of the way a motor works.

    It is also the way the Grid is set up 3-phase with a ground.

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  • 7 years ago

    BECAUSE, SO FAR IT IS THE BETTER AC POWER SOURCE TO RUN AC MOTOR FOR NOW. WE ALL NEED INDUSTRY TO SUPPORT OUR MODERN LIFE. INDUSTRY NEEDS AC MOTOR TO MANUFACTURE. == T H A T I S W H Y ==

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