Re: coax (grounding shield & AC?)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "M G" <gt4awd@xxxxxxxxx>

Can the Blumlein effect create problems on a smaller power level. For 
instance my 9kv 30ma NST? I would assume that quiet large coax cable 
would be used on a PIG setup, and of course a PIG is capable of 
moving a lot more amperage. Also, does the effect only apply to coax 
being used in Tesla Coil conditions or generally any current passing 
through a coax cable?
Thanks,
Matt G.


---------[ Received Mail Content ]----------

Subject : Re: coax (grounding shield & AC?)

Date : Fri, 04 May 2007 16:14:12 -0600

From : "Tesla list" <tesla@xxxxxxxxxx>

To : tesla@xxxxxxxxxx



Original poster: "Gerry Reynolds"!



Hi Matt,



What Dr R is getting at is the "Blumlein" effect. I have tried to

research this and believe it is a transmission line phenomenum when

improperly terminated. I dont know this definitively but believe its

possible to figure it out if someone would be willing to create the

effect. Presumably one would use a PIG and have a safety gap from

each HV bushing to ground to protect the PIG from damage. The

setting of the safety gap would be larger than usual so one would be

fairly certain that any firing was due to the effect and not to the

the voltages created by the TC. If we can find a volunteer, maybe Dr

R can help that person create the effect based on his

experience. Just an idea :-))



Gerry R.





>Original poster: "M G"

>

>"Don't run it with AC with ! the grounded shield on it."

>

>Hi, just wondering why it is not good to use the coax with grounded

>shield on for AC? I use coax for high voltage wire on my jacobs

>ladder. I did notice that if the grounding shield was left normal by

>the high voltage terminals of the NST it would pick up some of the

>electricity. A small, weak, arc on the other end of the shield would

>jump to anything conductive, such as your hand. Cutting the

>shield/coil of wire off about 1" from the terminals stopped the

>problem though. Is this the reason, or something else?

>Thanks,

>Matt G.
















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