Light bulbs keep blowing

I have a question regarding constant blowing of light bulbs.
My friend's father works in an old factory where the electricity is 480
volts stepped down to 120 for the lights. At times the voltage can increase
or decrease due to heavy equipment within the building turning on and off.
It's believed these spikes (and decreases) have contributed to the large
number of blown bulbs (the long factory type light bulbs).
My question is: is there a device that can be placed onto the light bulb
line that will reduce these fluctuations? Say something that would hold the
voltage at 120 during spikes and supply voltage during lower voltages to
reduce the number of bulbs blowing? Also, there are balaces (spelling?) in
these fixtures, so any componenent can't interfere with the balace.
Any discussions would be appreciated. Especially if anyone has theory input
to this problem since it involves many ways to possibly fix the problem.
I'd assume a capacitor will fix the decreased voltages and some sort of
regular to reduce spikes, but would one decide an adequete device and have
it cost effective? A store bought device would be the best solution, so if
anyone knows of one, please let me know.
Thanks in advance!
Reply to
Peter
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A voltage fluctuation is one thing, and if the voltage fluctuates with the load, it is likely related to bonding of the neutral. Spikes are another thing, and most of them are generated by your own equipment starting, stopping, and changing speed. Everybody here probably has a favorite way, or an opinion on dealing with spikes, and possibly sags. I say start with the simplest solution. I have had excellent results using some rather primitive, yet robust equipment manufactured by "Delta Surge Arrestors".
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These guys make surge and lightening arrestors and a bunch of other stuff. Very cheap, very effective, and robust. A good place to start, and to leave in place in conjunction with the more elegant things you might try if these don't cure the problem. I have cured a couple of friend's AC drive problems with some 35.00 parts from these folks. Drives that used to burn out major components up to twice a year are now into their third year without a problem. For a sophisticated "point-of-use" filter, try something that incorporates a combo of gas discharge tubes, chokes, and MOV protection. That about covers the spectrum for high, medium and low level spike shunting. A high quality unit will have all three. It's been a while since I touched on this, so I have no direction for you on that.
Reply to
Long Ranger
try a test. use a device like a Sola power conditioner
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a bank of lights. put all new bulbs in for the test. put all new bulbs in another zone as a control. see which zone has more problems.
some sort of ballast is usually a part of a florescent light fixture.
it is possible that whoever is buying supplies is simply buying the rock bottom cheapest lamp possible then scratching his head wondering why they don't last very long. at one of my facilities the new high efficiency fluorescents don't seem to last long. even the new electronic ballasts fail with annoying regularity.
Reply to
TimPerry
I assume that you mean fluorescent tubes and ballasts?
AFAIK, these things are pretty much unaffected by poor quality supplies - by their very nature they stabilise the voltage across the tube itself. Only if the voltage is dropping low enough to cause the lamp to go out should this affect lamp life, due to increased restarting (IIUC, one start reduces lamp life by about 15 minutes).
Buy better quality tubes, perhaps?
Reply to
no
I noticed from their website they make arrestors for 762 volt service "for 762 Volt Oilfield Applications" I never heard of such service. A while back there was a topic for different types of services available. Here's another one.
It makes sense, sort of, if the 762V is phase-phase, the phase-neutral voltage would be 440 volts. You could use 440 volt delta connected motors or other devices if rewired in a wye configuration.
Not sure why it's not shown as 831 volts (phase-neutral 480V).
Reply to
Michael Moroney
On Thu, 11 Jan 2007 07:49:13 +0000, no Gave us:
I don't see a reason for this to be true, but I suppose it is possible.
We have IR office and even hallway lights that rarely get switched on or off by actual hands. They cycle all the time. Perhaps bulb brand is the culprit.
Reply to
MassiveProng
a new outdoor sign illuminated with 4' fluorescents. the bulbs were not lasting 30 days. a photo controller had been installed an it turned out that passing car and truck headlight at night were turning the sign off and on.... not enough delay i guess. running the lights 7-24 fixed the problem.
web research turns up a variety of articles.
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Reply to
TimPerry
Work out the load and put in a suitably sized UPS this will also provide emergency lighting when you have a power failure
Gavin
Reply to
Gavin Parsons
| "L| |>simplest solution. I have had excellent results using some rather primitive, |>yet robust equipment manufactured by "Delta Surge Arrestors". |>
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These guys make surge and lightening arrestors and |>a bunch of other stuff. Very cheap, very effective, and robust. | | I noticed from their website they make arrestors for 762 volt service | "for 762 Volt Oilfield Applications" I never heard of such service. | A while back there was a topic for different types of services available. | Here's another one. | | It makes sense, sort of, if the 762V is phase-phase, the phase-neutral | voltage would be 440 volts. You could use 440 volt delta connected | motors or other devices if rewired in a wye configuration. | | Not sure why it's not shown as 831 volts (phase-neutral 480V).
Probably for traditional reasons like you see a lot of stuff listed as 440 volts or 460 volts instead of 480 volts.
Reply to
phil-news-nospam
| MassivePr|> On Thu, 11 Jan 2007 07:49:13 +0000, no Gave us: |> |>> (IIUC, |>> one start reduces lamp life by about 15 minutes). |> |> I don't see a reason for this to be true, but I suppose it is |> possible. | | a new outdoor sign illuminated with 4' fluorescents. the bulbs were not | lasting 30 days. a photo controller had been installed an it turned out that | passing car and truck headlight at night were turning the sign off and | on.... not enough delay i guess. running the lights 7-24 fixed the problem.
Point photo sensor straight up from a height with a cone shield.
Or just use a timer and an almanac.
Reply to
phil-news-nospam
Or, really go all out and buy an astronomic timer.
Reply to
Long Ranger

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