Re: Question regarding NST Phasing . . .

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Dan,

If you have a variac and an AC amp meter, you can try this "different" way
that is simple to understand from a theoretical point of view and not much
can go wrong.

Just hook up both NSTs in parallel and feed them a little voltage (like 30
volts) off the variac and note the current they draw.  Then reverse either
the primary or secondary connections and do it again.

The way that draws the smallest current (much less than one amp) is the
correct connection.  That is where both NSTs are working together.  In the
other case, the connections are fighting each other and drawing a whole lot
more current (a few amps at least).

Cheers,

	Terry


At 04:54 PM 9/2/2002 -0400, you wrote:
>Little confused over the phasing regarding NSTs (after reading the pupman
>NST PHASE FAQ)
>
>
>Common sense dictates that the transformers should be wired in parallel in
>identical phase with respect to each other.  Voltage will be the same, but
>current will be double.
>
>Would the following method be correct in determining phase???
>
>1.  Connect both NST's to line voltage.
>
>2.  Ground both NST Center-Taps and Chassis to AC Ground.
>
>This is where I get confused:
>
>Do I now connect only ONE high voltage wire to one end of one transformer
>and then touch to the opposite ends of each NST high voltage output to
>determine phase?  I guess the one end of the
>second NST that produces minimal arc (IN PHASE) is the one i should be
>paralleling with the high voltage wire output leg i have.
>
>Dan
>
>
>
>