[time-nuts] No more 60Hz, How do I discipline 120VAC 60Hz from a UPS

[J. Forster]

Filament transformers do not saturate at normal input voltages. They only
saturate if the peak flux, integral of VdT, exceeds the acceptable value
for the core.

What does limit the current is the voltage sag due to the properly scaled
sum of primary and secondary leakage inductance plus resistance.

-John

'===============

[snip]

> The author didn't say as much, but I wonder if transformers sold as
> 'filament' transformers were designed to saturate intentionally, to limit
> the inrush current they would otherwise apply to cold heaters.  I would
> expect modern transformers to work better, just because their
> manufacturers
> are more concerned with minimizing losses than they were back in the day.
>
> -- john, KE5FX
>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-
>> bounces at febo.com] On Behalf Of Neville Michie
>> Sent: Saturday, June 25, 2011 5:03 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] No more 60Hz, How do I discipline 120VAC 60Hz
>> from a UPS
>>
>>
>> An interesting question about making a 50/60 hertz source,
>> Does a 120 to 12 volt transformer have enough inductance to use as a
>> 12 to 120 volt transformer?
>> Remember, the inductance is proportional to the square of the no of
>> turns, where as voltage is proportional.
>> cheers,
>> Neville Michie
>>
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