If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #1735
Joined: Thu Oct 02 2008, 08:02PM
Location:
Posts: 7
I've read a few threads around here that have mentioned keeping the transformer ungrounded, or grounding, and when they suggest grounding they have varied between grounding to RF ground and mains ground. I'm curious of the advantages each has -- not really sure keeping it unground is an advantage though.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
You have to ground your NST to mains ground. They have 2 secondary coils and lets say the total output is 12kv then each secondary is 6kv. If you dont ground your NST then it may get destroyed and if you touch the case accidentally you will get a nasty shock. The secondary coil has to be grounded to a seperate RF ground because if you ground it to the mans ground, you can destroy other electronics in your house they are connected to that same ground.
Registered Member #1589
Joined: Sun Jul 13 2008, 06:40PM
Location:
Posts: 70
Technically, if you don't have what's called a "Terry Filter" on the secondary side of the NST, you’re going to have a problem with RF noise on your mains, nor would you want to put mains ground to the case due to the same reason. If you do have some form of secondary or primary filter, mains ground will be fine as long as there are no high voltage spikes (ie coil output, unfiltered tank circuit to transformer). I have not had a NST die on me due to an ungrounded case, but I have had a 12/60 die due to it being unfiltered on the secondary side and having the case grounded.
The case is connected to what is a center tapped secondary coil, so electrically it is connected in the middle of the secondary, electrically separating the coils into equally divisible voltage potentials depending on where it's grounded, in this case, it's near middle. If you ground the center, each side has 1/2 voltage potential to ground, and full voltage potential between the two terminals. If you don't ground the center, it has full potential to each other and some to ground (theoretically it’s supposed to be full potential to ground, but one side is floating in this case), if you ground one terminal, the other terminal has full potential to ground. Now, look at it across the coils. The transformer was (theoretically) designed for 6kV across each side of the coil at all times, running constantly, meaning the center is grounded. If you take off the center ground, the coil has 12kV all the way across it. It can’t stand that at a constant rate 24/7, but it can handle it. When it comes to coil use, it can barely handle it if it’s unfiltered.
Bottom line is, filter it if you can. It ultimately determines the life of it while being used for TC use.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
NST Grounding
