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Re: X-ray HV cables
- To: tesla@xxxxxxxxxx
- Subject: Re: X-ray HV cables
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Wed, 02 Nov 2005 08:36:59 -0700
- Delivered-to: chip@pupman.com
- Delivered-to: tesla@pupman.com
- Old-return-path: <vardin@twfpowerelectronics.com>
- Resent-date: Wed, 2 Nov 2005 08:41:29 -0700 (MST)
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Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 11:52 AM 11/1/2005, Tesla list wrote:
Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
I got a 150 KV rated xray HV cable. Per D.C.'s recomendations, I
stripped the outer jacket, removed the braded shield, and cut off
the 'candlestick' ends. I then reterminated to acomadate the
connections as I needed. The outer jacket (what was under the shield
CONDUCTS !! It nicely shorted the hv output of my PT! What's going
on here? Is this normal? I placed the hv leads of a 15kv nst at 2
points on the insulation away from the conductor, and it happilly
arced! Any thoughts would be apreciated.
Most HV cable has a semiconducting layer (or two or three) to even
out the electric field and reduce internal corona. It makes the
effective diameter of the wire larger, and since most of the current
is being carried by the copper core, it doesn't appreciably change the loss.
Mind you, this wouldn't work too well for RF.