>At 06:48 AM 7/21/2001 -0700, you wrote:
>
>> >
>>Steve -
>> >
>>3. there should be a 10 - 15 ohm, 10w vitreous-enamel (glass) coated
>>resistor in series with the HV+. A ceramic block type power resistor
>>should not be used.
>>
>
>Why not the ceramic (cement) type Rich ? Reliability ? Shrapnel if an
>event occurs ?
>
>Tnx....Phil
>
/\ To be successful, a glitch resistor must not break down internally
during a major fault. If it does, a metal-vapour arc takes place -
which limits the V-drop across the resistor to c. 20v instead of the
needed several kV. Thus, the desired ability to limit current to a
finite value is lost. Shrapnel and internal breakdown are problems with
ceramic-type resistors. To find out if a glitch resistor is up to the
task at hand, (Note: the meters and their shunts should be protected
with suitable glitch-diodes). short the anode supply to ground with a
large plastic handle screwdriver. If there is a loud noise, the circuit
breaker opens, there is no sign of damage, and the ohms are unchanged,
the glitch resistor did its job.
cheers, Phil.
>
>
>>- R. L. Measures, 805.386.3734,AG6K, 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
>
>
>
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
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