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 #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
For practical purposes, winding without impregnation or with just a coat or spray of alkid vernish, as spar clear transparent :
-- using 0.2mm kraft paper between layers, max voltage between two sequencial layers are limeted to 500V
-- using 0.1mm polyester (Mylar) film between layers, max voltage between two sequencial layers are limited to 1100V
- Using 0.2mm polyester between layers, max voltage 1600V,
The insulaton has to be extended 3-4mm in excess of the layer lenght, to create a shirt between the layers (the crepage is about 300V/mm)
Without more info from your trafo is impossible to help. Provide complete data and pictures about your trafo. ---define the secondary voiltage ---define the number of sercondary turns --- define the secondary wuire diameter, ---- sketch of your trafo core and DIMENSIONS
Thanks for the information, do you know where can I get 0.2mm polyester sheet? I'm also trying to get 50KV secondary, wire is 38awg, and I can do about 200 turns per layer, and the core is 81-33-16
Registered Member #3700
Joined: Sat Feb 19 2011, 12:59PM
Location:
Posts: 107
Andre; 1- wire #38 is very ard to work, evem for experieced coilers. I might suggest you not go over #28AWG wire.
2 -0.2mm polyester or mylar film you will get at a workshop that repair small tranformers and rewind motors and generators It is cheap, about US$2 for a 900mmx120mm sheet. If you core is smaller than 50mmx50mm , use 2 sheets of 0.1 to compose a 0.2mm thick. Emgineering drawings use Mylar paper, maybe you can buy the Mylar at art supply store. A preliminar test may be tone using kraft paper pre impregnated with alkid vernish.
By the way.... ---define the number of sercondary turns ---post a sketch of your trafo core and DIMENSIONS
Andre; 1- wire #38 is very ard to work, evem for experieced coilers. I might suggest you not go over #28AWG wire.
2 -0.2mm polyester or mylar film you will get at a workshop that repair small tranformers and rewind motors and generators It is cheap, about US$2 for a 900mmx120mm sheet. If you core is smaller than 50mmx50mm , use 2 sheets of 0.1 to compose a 0.2mm thick. Emgineering drawings use Mylar paper, maybe you can buy the Mylar at art supply store. A preliminar test may be tone using kraft paper pre impregnated with alkid vernish.
By the way.... ---define the number of sercondary turns ---post a sketch of your trafo core and DIMENSIONS
Thanks for the info Tony, I will try that, so far I got to 20KV I'm trying to get to 40KV I had try to stack them together the 2 20KV coils but that didnt work so I had starte a new thread on it , so I'm going to see if I can build a 40KV coil with mylar film, I'm no experience winding coil but I had successfully winded a few coils with 38AWG and got to 20KV with it :)
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Andre wrote ...
I'm curious about your transformer, what calculations did you do to come up with those numbers?also are you using anything as reference?
simple math. I don't know will it going to work. All i know i have Half bridge current mode SMPS to drive transformers, i have 160V voltage swing. since i need 20V/T primary simply 160/20=8T Same for secondary. Resistance will be low for 30KV (~500R secondary resistance ,so 66mA for 2KW should give 2W , no problem) Only consideration i have is resonance, it will lower my V/T ratio, i guess i should use resonance in my favor to get more V/T. Time will tell am i right... In picture was old idea for 60KV transformer, but core is to big, i can get same power for smaller size.
I tried to stack them together, the way you are showing in the picture but somehow it does not work, please post pictures when you get it working, I will like to see this is my design:
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.
transformer width
