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 #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
The proper way would be to use a buck transformer on primary of your first NST. If your line is 240V then you'd need a 48V buck transformer, with current equal ti input current of your nst.
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Tom Williamson wrote ...
What you want is not parrallel your thinking of series parrallel only ups the current your trying to up both the current and the voltage
The NST's provide 12kV and 15kV across their outputs respectively, and both are 60 mA. I'm looking for 120 mA at 12-15 kV. So I want parallel, since I want more current without any change in voltage.
@ Marko: A buck transformer sounds like the best idea. That will bring the big NST down to 12 kV, correct?
I only have a 500VA variac, but I changed the fuse to a 5A one, so technically it can run one NST, but I don't want to overload it.
Registered Member #4052
Joined: Thu Aug 11 2011, 04:43AM
Location: IN ,USA
Posts: 69
If you put them in parallel you would get 12KV at 120mA. However the lower voltage one would suffer. I read somewhere that even though you would only get 12KV the insulation on both transformers still has to deal with 15KV, because the difference in voltage is shorted into the lower voltage transformer.
I think that lowering the input voltage on the 15KV transformer probably is your best option. If you are worried about you variac you could probably just make your own step down transformer out of a MOT or something similar.
Registered Member #4078
Joined: Tue Aug 30 2011, 12:53PM
Location: Sydney, Australia
Posts: 19
I think it depends on how you're using them. Remember that an NST's output voltage will drop a fair bit under load, so if you are using them in a way that loads them from the start, you can probably get away with it.
I have a pair in parallel that arent exactly matched (My HV probe shows a KV or so difference), but they dont have a problem at all in parallel. The extra stresses induced are no more than 10% either side of their ratings, which should be survivable.
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.
Slightly dissimilar NSTs - Parallel??
