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Re: MOT Caps DC Limit

Original poster: "Paul Benham" <paulb@xxxxxxxxxxxxxxxxxxxx>

Hi Ted,

I have had good results using MOT caps in a DC power supply.  However I am
not running them at a voltage greater than what they would see in the
microwave oven.

I have used two in series at 6kV without problems and I have balancing
resistors across them.  I have two sets in parallel on a +6kV output and
another 4, two in series, in parallel with another two in series on the -6kV
output.  This gives me a total of around 1uF on each 6kV output.

Cheers,

Paul.



----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, July 17, 2005 6:29 AM
Subject: MOT Caps DC Limit


> Original poster: tesla <tesla@xxxxxxxxxxxxxxx>
>
> Team
> I'm looking to use MOT caps rated around 2300v AC as DC filter caps for a
DC
> based coil.
> You would not believe how hard it is to find  HV caps in NZ of 3uF to 6uF
> 10kv wkg. 5 Yrs ago a glut as old high power TV and MF xmitters changed to
> SS. Mostly dumped or sent back to mfr ( due pcb's)
>
> One that I have notes its Test Voltage was 10kv.
>
> Has anybody experience with just how far I can take a MOT cap in DC filter
> service. My guess is about 6kV DC for short period (1 min or so) is
probably
> OK
>
> FWIW The system is to be 3 MOTS per side rectified for Plus and minus 8kV
> into 50 Hy or so and ASRSG up to 200bps with 90nF of Tank Cap
> Tnx
> Ted L in NZ
>
>
>