[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TCML] A couple of questions - bipolar earthing.

My experience is limited, but when I tried grounding either end of my small *horizontal* bipolar coil, the arcing greatly diminished. Does it make a difference that this design is not for two vertical coils linked, but for a single wound, horizontal coil?
The coil in question has two fairly tall terminals ending in small brass balls that I can swing apart or closer together. I use a 7,500 volts 30 mA NST usually and I have never had problems with it not being grounded. 

PBT
----- Original Message ----- From: "Peter Terren" <pterren@xxxxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, February 23, 2011 11:27 AM
Subject: Re: [TCML] A couple of questions - bipolar earthing.



Yes, a bipolar coil does need the base connection earthed.
I have blown a couple of MOT's before I realised this.
While a bipolar coil develops a potential between the two coils there is still a capacitance between each toroid and the ground which will try to get back into your equipment to the base of the TC. An inch or two of spark it might be controllable particularly when there are sparks between the two toroids lower the voltage. But try to run streamers and that will be a different matter. And if the toroid gets close to ground or a grounded object then you are guaranteed a flashover from secondary to primary. 

Peter
tesladownunder.com
----- Original Message ----- From: <mrapol@xxxxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, February 23, 2011 11:20 PM
Subject: Re: [TCML] A couple of questions
A bipolar coil does not need a ground connection. That's one reason I chose to build one as my first coil. 

(mrapol at frontier dot com)

Paul
----- Original Message ----- From: "B McPeak" <bmcpeak363@xxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, February 23, 2011 6:21 AM
Subject: Re: [TCML] A couple of questions



Paul,
Thanks for the help!
One question... I think I saw somewhere that a Bi-polar coil does not need a ground? Or does not need an earth ground? 
Thanks,

On 2/22/2011 9:44 AM, mrapol@xxxxxxxxxxxx wrote:

Modestly I offer:

http://www.instructables.com/id/Tabletop-Tesla-Coil/

A bipolar tabletop model. You can email me with questions too.

Paul


----- Original Message ----- From: "B McPeak" <bmcpeak363@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, February 22, 2011 8:45 AM
Subject: [TCML] A couple of questions



Hello all,
Does anyone know of plans for a tabletop Bi-polar coil? I have found
lots of videos but not a lot of hard or modern info. I have the Boy
Electrician book plans. Suppose it could be modified. I would like to
build one with a cylindrical secondary, not cone shaped.
Also I know this has been asked before. I need to put in a ground rod
for my present coil. My concern is that any practical location is near
the mains ground and copper water lines or the ground cable would be
very long.Any suggestions would be appreciated.
Thanks,
--
Brad McPeak

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla



--
Brad McPeak

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla


_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla




_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla 

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla