Re: De-Rating '400hz' Variacs

In a message dated 96-05-14 00:28:38 EDT, you write:

>I asked the same question a while back and got the answer of 60/400 or 18
>  Even so, I bought one and took it apart.  Talk about nicely wound toroidal
>  I took the thing apart with the intention of using the wound cores as
>  I'm going to cover mine in epoxy for insulation.  They should work quite
>well for
>  400Hz and higher frequencies.
>  -- Chip

What was the size of the core that you used? (and variac specs) Did you have
any voltage breakdowns? What value of inductance did you end up with?

I was thinking of using the cores for rf chokes myself!

Kevin M. Conkey

 The size of the three cores are about 5" in diameter, 2" hole, and and 
 about 1.25" thick.  They came off a 10A 400Hz 3 phase variac.  I haven't
 put them in any circuit, so I haven't had any break downs yet :-).
 I have no idea about the inductance.  If you can tell me how to measure
 it using a signal generator, frequency counter, oscilloscope, and/or
 a VOM, I'll try it.