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 #1132
Joined: Mon Nov 19 2007, 06:15PM
Location: Slovenia
Posts: 84
Dago wrote ...
I'm sorry but it doesnt work this way. If a lamp goes open circuit how is it going to suddenly get 14kV over it when loaded it has 110V over it?
Its simple. Current stops on all of the other lamps so that means the voltage drop on all lamps falls to 0.So if nobody is droping any voltage that means the burned out bulb gets all of it.Hmmm wouldnt mind seing what happends to that bulb hehe
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Current stops on all of the other lamps so that means the voltage drop on all lamps falls to 0.So if nobody is droping any voltage that means the burned out bulb gets all of it.Hmmm wouldnt mind seing what happends to that bulb hehe
There used to be some areas that ran street lamps like that, with a non-standard several kV across 20 or so in series. It's not done now, because of the high level of insulation required, and because now they are all paralleled across the ubiquitous standard supply. Each lamp had an "antifuse" across it, consisting of a very thin shim of insulation between two wires, that would punch through if the lamp failed open.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I believe that the street lights are like that in front of my house, when we were digging for a driveway the bobcat only found a single wire for the streetlight. The scary part was that when they found it they didn't realise that it had some insane voltage on it, so they were yanking it around to get it out of the piece of pipe it was in... Luckily we called the city later that day and they came to move their junction over so that the construction could continue before one of the workers decided to cut into it...
As to what would happen when one bulb failed in a string like you propose I wouldn't expect too horrible of a failure. The filament would vaporise, and the ark would reform inside the bulb, slowly melting the glass till it cracked, then if you were luckly even in air there would be enough voltage to continue arking from the inside of the bulb until the user decided to turn off the pig...
Registered Member #1034
Joined: Sat Sept 29 2007, 12:50PM
Location: Chillicothe, Ohio
Posts: 154
Could anyone try out what would happend if that antifuse was not there?
Ok, I tried hooking up a dead light bulb to a 7200 ac voltage source that is ballasted to keep the current down to one amp. This picture was taken almost immediately after the power was turned on. I didn't want to leave it on too long because I was afraid it would burn up the light socket. (see post below for picture)
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
By the look of the pic, the arc just arced across where the electrodes come into the glass. I had a similar result, but the glass to very hot very quickly.
Registered Member #1132
Joined: Mon Nov 19 2007, 06:15PM
Location: Slovenia
Posts: 84
How about burning out a good bulb with high voltage. That would need one big supply. The idea is the filament would draw out the arc inside.Meaby it can be done to a very weak bulb.
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.
I obtained a pole pig
