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 #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
So I got myself a slightly used a Westinghouse PT-15, 1750VA rated 120:1 PT from a large transformer supplier. $250 each - I was surprised at the weight of the unit in comparison to the smaller sized GE one - only 85lbs. Westinghouse unit is 100lbs.... and its a monster.
I did a test on the transformer at 7.5 kVA tonight and was pleasantly surprised to find a mere 3 degree change in core temperature after 10 minutes of abuse. I'm very impressed! I can't wait to power up my Tesla Coil with this monster :)
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Great! Would love to see a pic! Coincidentally, there's a guy selling 1750VA Westinghouse PTs on eBay right now. He's in OR, and...yikes!!...wants $500 US each for them! $250 CAN is still a lot of $$, but unless they're being junked it's a fair price.
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
Well Mr.Holmes.... Boundary Electric in Grand Forks BC has great deals on PT units... they have 20:1, 80:1, 120:1, 180:1.... and lots of bizarre units too...
Hey, they are good people to deal with, and they are right on the US border!
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
This transformer operates much like a 5 kVA PIG unit.... identical winding configuration and secondary resistance (1.4 kOhm)
These trannies pulled 75-80A on 120V --- 8-9 kVA! The arc is pretty nice --- very snappy and quite loud. The transformer never broke a sweat after a few minutes like this. So short runs aren't an issue at high kVA. PT-15s are technically able to run continuous for 2-2.5 kVA, so I could easily expect 5-6 minute runs at 7.5kVA without worry.... and if I had two trannies I could easily series them too. The plate says these units can hold 34.5kV for 1 minute without flashover --- they can hold double their voltage indefinitely and that was tested by the transformer shop a number of years ago - according to a technican who spent years around Westinghouse products!
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
I just deleted 3 posts in this thread due to breakage of rule II E. :
Make sure each post has a point. Unless you're in the chatting board, there's no need for a one-liner post that doesn't have any real content. Save the one-liners and offhanded comments for private messages.
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.
My new PT: 14.4kV Westinghouse
