Re: Primary Coil...
Subject: Re: Primary Coil...
From: nikki-at-fastlane-dot-net (Bert Pool)
Date: Tue, 13 Feb 1996 19:34:28 -0500
>Received: from fastlane-dot-net (fastlane-dot-net [22.214.171.124]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with ESMTP id SAA16166 for <tesla-at-grendel.objinc-dot-com>; Tue, 13 Feb 1996 18:32:46 -0700
[snip a section describing different primary coil materials]
>In my primaries I've use heavy-PVC sleeved Copper water pipe, but on future
>primarieswill change to a HDPE sleeving. 'Poly pipe' micro-irrigation tube
>is a verycheap sleeving material. Plastic sleevings are not as beautifull as
>bare copper, but Ive never had a 'flashover' since.
Telephone companies place huge (over 3 inch diameter) cables in underground
conduits. Much of this cable is pressurized with dry nitrogen. The
nitrogen is supplied to the cable through "air pipe". Air pipe is a
polyethyelene covered thin aluminum tube. It has about the same flexibility
as large garden water hose. The diameter is about 1 inch, and since most of
the current we deal with is skin effect, tubing works quite well. I have
used this air pipe to make a big primary and it worked very well - the poly
covering helps reduce flashovers and corona loss. Telephone companies (or
their contractors) will often replace thousands of feet of this air pipe and
just throw the old away. Make friends with a telephone company splicer or