Re: [TCML] Ammeter on three phase supply

[Tyler <tyler.c.c@xxxxxxxxx>]

If the generator is implemented in 3-phase delta configuration and you
measure the current through all three wires, it has to be zero and you'll
get no measurement. Kirchoff's current law requires this to be the case
because charge must be conserved. If it is in Y-configuration and you
measure the current through the three phases but not the center tap, it is
possible that it could read the current, but more details would be needed as
to the circuit because if both positive and negative voltage is being
sourced at a current simultaneously, it would not show the correct current.

You could use three current transformers, take the absolute value of each
signal, and sum them. This would be the actual current in both delta and y
configurations.

Tyler


On Thu, Sep 15, 2011 at 9:20 AM, Phil Tuck <phil@xxxxxxxxxxx> wrote:

> All,
>
> I have acquired a three-phase 250v alternator that has had its three phase
> output split to provide three single phase outlets of 240v each.
>
> If I put the three live wires through a current transformer, would it give
> a
> reading of the total current the alternator is giving out? In other words
> if
> each phase has a [say] 10 amp load, will the ammeter read the total
> alternator output of 30 amps, or would I need three separate CT's and three
> ammeters?  (I suspect the latter unfortunately)
>
>
>
> Regards
>
> Phil Tuck
>
>
>
> www.hvtesla.com
>
>
>
>
>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla