>
>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
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|