RE: [TCML] Calculating transformer output at lower voltages

["Phil Tuck" <phil@xxxxxxxxxxx>]

Surely this supposes the wire gauges are the same, which they aren't 

Regards
Phil Tuck

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Reverend Fuzzy
Sent: 07 June 2012 18:28
To: 'Tesla Coil Mailing List'
Subject: RE: [TCML] Calculating transformer output at lower voltages

Since I also have no high voltage meter,  I figured out an easy way to use
my multi-meter in the ohms, then volts AC scales....

TRx = Rs/Rp

We can then use the tested ohms ratio (TRx:1) to calculate the voltage
coming out of the secondary, when a specified test voltage is applied.

Hypothetical value example...
Secondary measures 1250 ohms
Primary measures 10 ohms.

Ratio (as per above math): 125:1  (125 is now our multiplier)

120v in X 125 = 15,000v out (normal NST)
4v in X 125 = 500v out (within the range of most multi-meters)

I even threw together a small Windows application to do the math for you.

See also:
 http://www.msbministries.org/blog/2011/11/17/new-software-transtest/

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of mrapol@xxxxxxxxxxxx
> Sent: June 07, 2012 8:30 AM
> To: Tesla Coil Mailing List
> Subject: [TCML] Calculating transformer output at lower voltages
> 
> I know the usual formula Vs/Vp = Ns/Np for calculating transformer
voltages,
> but I have a problem in that I am dealing with a sealed NST and don't know
> the number of secondary or primary turns. What I am trying to do is
> calculate the output of a 12kV NST when it's getting less than 110 volts
> input. For example, if I feed the NST 30 volts AC, what does it put out?
Is
> there any way to figure this out without a high voltage meter (which I
don't
> have) and without knowing the number of primary or secondary turns?

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