[AMPS] HV Fusing / Diode Protection

[measures]

>
>I have used the Metal Oxide resistors available in Digi-Key (Panasonic and
>Yageo) for the same purpose.  They are flame retardant and handle high surge
>currents.
>
But not this much surge current. 

>0.82 ohms is listed as a stock value in 2 watt rating.  High voltage may arc
>across the small body when open but that's still preferable to the short
>circuit situation.
>
An arc has only about 20v drop across it.  Thus, in a 2500V circuit,  it 
hardly limits current at all.  A glitch resistor must be robust enough to 
suffer no damage during a major fault.  Thus, the 0.82-ohm, 2w glitch 
resistor is Not good engineering practice.  A 10-ohm 10w ww glass coated 
resistor is much more suitable for glitch R duty.  With more than 3kV, 
place two such resistors in series to distribute the V burden.  

later, Steve
>
>
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>


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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