On Nov 20, 2004, at 6:50 AM, Bill Turner wrote:
On Fri, 19 Nov 2004 09:42:43 -0800, R.Measures wrote:
Question: A Hipersil transformer with a combined primary+secondary
winding ESR of 0.144?,, is connected to a FW rectifier/C-filter. If
the transformer is connected to 240Vrms mains with an ESR of 0.127?,
what is the maximum peak inrush current? What would be a suitable
value of step-start R to limit the inrush current to 50A-rms? (--
note -- assume that the Hipersil transformer has virtually zero core
loss)
_________________________________________________________
There is another factor which must be considered: The amount of
capacitance at the output of the full wave rectifier. The
transformer/rectifier will try to charge it to full voltage in the
first half-cycle and that will cause the greatest part of the inrush
current.
The filter stores c. 4500J @9900v.
--
Bill W6WRT
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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