[Amps] Bleeder Resistor Inquiry

[aborg]

Joe,

  The bleeder is a Ohmite L225J100K. 
Thanks too all who have replied, keep the info comming
I love the info.
73's
****************************************************
--- "Joe Subich, K4IK" <k4ik at subich.com> wrote:
> 
> Mike, 
> 
> Your bleeder resistor is too small.  
> 
> 4000 volt transformer with fullwave bridge should 
> produce at least 5600 volts no load. 
> 
> 5600 volts across 100K -> 56 ma 
> 
> 56 ma * 56 ma * 100K = 313.6 watts 
> 313.6 watts >> 225 watts 
> 
> At a minimum, you need either: (1) a pair of those
> resistors 
> in series, (2) a 200 K 225 watt bleeder or (3) a
> 100K 500 watt 
> bleeder.  Even then, you will be not have a lot of
> safety 
> factor and probably need to provide cooling for the
> bleeder. 
> Safer yet would be a (series) string of four 50 K
> 225 watt 
> bleeders.  
> 
> Finally, is the resistor rated for > 5 KV?  Most are
> not.  
> 
> 73, 
> 
>    ... Joe, K4IK 
>  
> 
> 
> 
> > -----Original Message-----
> > From: amps-bounces at contesting.com 
> > [mailto:amps-bounces at contesting.com] On Behalf Of
> aborg
> > Sent: Sunday, April 24, 2005 9:44 AM
> > To: Amps Amps
> > Subject: [Amps] Bleeder Resistor Inquiry
> > 
> > 
> > I am currenty building a HV Power Supply using a
> > 4800vac pole pig, 40uF 5kv oil filled cap , 10kv
> PIV
> > rectifier board, 20 amp variac and a 100k 225watt
> > bleeder.
> > 
> > The initial power up started well without the
> bleeder
> > connected to the circuit after 30 min burn-in no
> > problems. Discharged the circuit and added the
> 100k
> > bleeder and 5 mins the bleeder starts to smell and
> the
> > exterior paint starts to bubble. Shut it down and
> > examined the circuit, all seem accurate. 
> > 
> > Question : Is my bleeder to small ?
> > 
> > P.S. : The variac was set at 4KV at all times.
> > 
> > Mike-KK4MS
> > a_borg at yahoo.com
> > 
> 
> 

Mike-KK4MS
a_borg at yahoo.com

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