Re: Insulation of HBT s

• To: tesla-at-pupman-dot-com
• Subject: Re: Insulation of HBT s
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Wed, 07 Oct 1998 21:40:15 -0600
• Approved: terryf-at-verinet-dot-com

Hi Reinhard,
              I think that might have been me?

> Original Poster: RWB355-at-aol-dot-com=20
> 
> Hi All,
> 
> Someone wrote he wouldn=B4t use PE for insualtion because it would melt.
> 
> I sort of have to agree/disagree with this. First of all PE only melts at
> temperatures above 100=B0C. If your xformer gets hotter than this, you wi=
> ll
> start cooking the Formvar on the wire. I think a safe xformer temp would =
> be
> around 75=B0C.

I wouldn't use formvar if I was paid. The only stuff I look at is 
modern stuff like polyesterimide (polythermaleze). Formvar has a 
habit of cracking off wire all on its own as it ages. I have rewound 
a number of transformers with formvar coated wire.  If you want to 
get the most from a transformer for short periods, significant 
temperature rise is quite tolerable. It also makes the coil setup 
rather portable. I still wouldn't use PE, especially between the 
primary and the core. Look at what real manufaturers use. :)

Malcolm

>  My insulation scheme is paper-PE-paper. This helps the oil wick up and s=
> ort
> of protects the PE from coming into direct contact with the windings shou=
> ld
> they get hot.
> 
> 
> Coiler greets from germany,
> Reinhard
> 
> 
> 

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