[Amps] HT 57 blocking cap ratings?

[R.Measures]

On Dec 4, 2004, at 12:08 AM, Neil Carr G0JHC wrote:

> I note the HT57 (N750 series 200pf 15KV) has a max current rating on 
> their
> web site of 12amps at 10MHz and 15 amps at 30MHz, data is based on not
> exceeding the max rated 15kv.

Hello, Neil -- The data is based on an allowable rise in temperature 
over ambient.   To calculate the actual  potential across the capacitor 
requires a bit of math.  For example, 200pF has c. 25-ohms of XC at 
30MHz.  Since E = I x R,  E = 15A x 25-ohms = 375V-rms.  Thus, 
exceeding 375V at 30MHz would exceed 15A and overheat the capacitor.
>
> Does than mean their current handling is much great at, for example 
> 4kv? And
> has anyone any data on their current handling rating at 50MHz?

My guess is that the current handling ability at 50MHz is c. 16A.
>
> Any info appreciated.
>
> 73 Neil G0JHC
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org