Re: Oil Filled Capacitors
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I am not really a high voltage power supply !!
I am a high voltage power supply engineer. I work for CPI designing power supplies for Medical X-ray generators. These are up to 100kW, 150kV and 1000mA.
Some of my work can be seen at www.cpii.com/cmp
These incidently use resonant technology.
I learned about the corona effects from a company called ASC. This company was TRW. They make and have made many custom capacitors for HP, Tek, Varian, Fluke etc. They are generally white wrap and fill construction.
They explained the corona effects in capacitors to me. They have an application note at:
Wima built their capacitors with two sections in series to help with the self-healing properties. When one of the sections arcs the other still presents impedance.
ASC has built some snubber capacitors for me that have four sections in series to obtain an a.c. rating of 800 v rms. The dc. rating of these was 1600 v.
As someone pointed out the corona arises because the electric field is not uniform in the area of a void or mismatched dielectric constants.
These comments on capacitors also apply to high voltage transformers. This why vacumn impregnating is used.
I have done some work with solid dielectric materials, potting, matching the dielectrics and preventing voids is quite a challenge.
P.S. just got home from the Rochester Hamfest with a pile of 7K plugins to work on.
---------- Original Message ----------------------------------
From: "Miroslav Pokorni" <mpokorni2000@...>
Reply-To: "Miroslav Pokorni" <mpokorni2000@...>
Date: Fri, 30 May 2003 02:42:39 -0700
I guess, it does not help, but then everything has a resonant frequency. The