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Re: MOT Caps DC Limit

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Ted,
I have a DC supply that uses MOT caps for filtering.  I limit the DC voltage
across any cap to 1.4 times the AC voltage rating.  Since MOT caps are so
cheap (less than $2 each, free if you are a good scrounger), there is no
point in overvolting them.  Better to spend an extra few dollars than have
one explode and spray oil over everything, and/or short and take out your
diode strings.
--Steve Y.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, July 16, 2005 11:29 PM
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
>
>
>
>