380v vs 240v power

[Peter]

>>> Another nice feature of 3 phase is constant power, no matter the phase
>>> angle.
>>
>> IANAPG (I am not a power guy), but:
>>
>> Phase angle between voltage and current? Isn't that the power factor? PF
>> is a huge issue in industry.
>
> Sorry about not being clearer.  In single phase 60 Hz power, there are
> 120 power peaks per second or 2 per cycle, when the voltage and current
> are maximum (assuming non-reactive load).  With 3 phase, the power is
> constant throughout the cycle, with no peaks.

In 2-phase quadrature power you have the exact same result. That is not 
the reason why 3-ph is better. The reason is copper line weight per unit 
length and power transmitted is maximum, for a given voltage, and it is 
much easier to generate high power dc from it (especially with 19th 
century equipment).

IANAPG too,
Peter
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