List-Post: emc-pstc@listserv.ieee.org
Date: 11 Jul 96 20:21:26 EDT
From: Egon H. Varju 73132.2...@compuserve.com
To: INTERNET:jeich...@statpower.com jeich...@statpower.com
Cc: IEEE emc-p...@ieee.org
Subject: Re: Transformer requirements in IEC950
Hi Jim,
1. To the best of my knowledge, you would
Hi Jim,
1. To the best of my knowledge, you would have great difficulties convincing ALL
the agencies that any form of varnish impregnation reliably complies with Clause
2.9.7. This is not to say that the concept is invalid; it's just that many
agencies are not convinced ...
2. On the other
Thanks all for the replies.
The one point of contention seems to be in what ways varnish impregnation is
helpful. I think there are three aspects to this question:
1. Varnish as electrical insulation: Rich gives good reasons why varnish
is not suitable as electrical insulation for safety
Date: Mon, 8 Jul 1996 08:55:39 -0700
From: Rich Nute ri...@sdd.hp.com
To: jeich...@statpower.com
Subject: Re: Transformer requirements in IEC950
Cc: emc-p...@ieee.org
Jim Eichner asks several questions about transformer insulations.
4. Does our varnish impregnation help us in any way
Jim Eichner asks several questions about transformer insulations.
1. Is a ferrite core considered conductive since it measures several
thousands of ohms?
Consider that:
Conductors are never zero ohms, but approach zero.
Insulators are never infinite ohms, but
jeich...@statpower.com wrote:
I have some questions that are probably old hat to some of you but have me
running in circles! I would take these to my TUV contact, but its a
holiday south of the 49th! Any help would be appreciated.
The discussion relates to a high-frequency switching
I have some questions that are probably old hat to some of you but have me
running in circles! I would take these to my TUV contact, but its a
holiday south of the 49th! Any help would be appreciated.
The discussion relates to a high-frequency switching transformer with a
primary (mains)
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