Current calculation

[solomon]

I have a 3phase 4 wire installation , when i measured the phase current using a clamp-on meter, the Red phase has 218A,Yellow has 215A and Blue has 256A, what is the total current drawn from my generator?
Also what is the current of the nuetral line?

 

[charlie b]

I calculate the neutral current at 39.5 amps. The formula:
Neutral = square root of (A*A + B*B + C*C - A*B - A*C - B*C)

There is no such thing as a total current for any three phase system. The phrase has no meaning. You can find the average, if you wish. I come up with 230 amps.

 

[Smart $]

The formula Charlie used for neutral current is only accurate if all three phase currents have identical power factors.

 

[GoldDigger]

Although there is no such thing as total current, there are both total power (kW) and total volt-amps (kVA).
And once you have either of those you can calculate an equivalent balanced three phase current that gives the same number.
For watts it is pretty simple. For VA, not quite, especially if different phase loads have different power factors.

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