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[AMPS] Vacuum Variable voltage rateing

To: <amps@contesting.com>
Subject: [AMPS] Vacuum Variable voltage rateing
From: 2@vc.net (measures)
Date: Thu, 12 Apr 2001 08:53:07 -0700
>
>    Looking at Jenning's  data on Vacuum Variable capacitors I noticed that 
>the
>voltage rating on the capacitor is the Test Voltage and the working voltage 
>is less.
>For example a 3000volt cap   Cxxx-300-3  has a test peak voltage rating of 
>3Kv and a working peak voltage rating
>of 1.8KV.  A 5Kv one has working voltage of 3KV and a 7.5 has working peak 
>voltage of 5KV.
>    So if I am running a 4-1000A  with 5K plate resistance and 1500 watts out
>the RMS Plate voltage would be 2740 Vrms or 3872V peak.  I can't use a 
>3000V cap based on those
>figures but must use at least a 7.5KV cap.
>    So what gives. I expect most of us are pushing these caps beyond their 
>working voltage limits.
>
?  DC is normally used to test vacuum  caps. Withstanding (breakdown) 
potential decreases as freq. increases.   At 30MHz, a 60% derating is 
commonly used.  

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


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