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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I've asked this before, but I'm hoping there are others with some field experience that can offer their opinion. I am looking at the DELTA 303 3 phase lightning arrestor. How effective are these at protecting electronic equipment from a *direct* lightning strike. My guess in not that effective.
This begs another question. How do utility companies protect their high voltage transmission lines from lightning strikes? Surely, lightning rods can't work all the time?
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
The main issue with a direct strike, is your sending multiple KA down the line, and even if the arrestor works as it is supposed to, the enormous current in the wiring can induce current and high voltages in nearby electronics.
I recall seeing one story where a church had an old lightning rod, ground wasnt the best on it and lightning hit it one time, arced from the ground wire to an old natual gas line for gas lanterns (no gas in it, it was out of service) but the gas line looped around the sanctuary, and the field setup blew out most the audio equipment and lighting.
By all means put the arrestor in, it may be capable of arresting surges in the power caused by near strikes, and if it saves some equipment even once, it'll probably be worth it.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I once tested a 3P+N surge arrestor in a control panel for a machine by accident, I switched phase 1 and neutral on the main breaker, (stupid french shit puts N terminal in the opposit side of others), but I did not double check it :)
Well, the arrestor worked fine, it was a nice and red unit, and afterwards it was black, blown out but nothing else got damaged.
Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
I saw a special about high voltage transmission lines on the history channel the other day. Many have unshielded wires on the highest point of every tower. These lines protect the current carrying lines below them.. (or so the theory goes). The linemen who work on them say they work well. So well that if there is the threat of lightning within a few miles they halt work because the lightning can go miles on those top conductors before it is shunted to ground.
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lightning strikes
