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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
"And how do DC fields induce fluorescent lamp tubes to glow?
"
Fluorescent lamps work on DC too. There even was a Rectified Fourescent, With an anode and filament/cathode, but it vanished about 70 years ago. I've worked on units that use banks of DC UV tubes:Polarity had to be flipped from time to time to even out cathanode wear
RF here means rectified fluorescent not radio frequency.
Registered Member #3108
Joined: Thu Aug 12 2010, 05:37PM
Location: Worthing, England
Posts: 72
Wow, that is amazing. I'v always wondered if corona could be seen emitting from transmission lines - Ill have to keep a look out for this phenomenon as winter is right around the corner!
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You'll be lucky if you see it in England. The highest transmission voltage we use in the UK is 400kV, and that's for the "Supergrid". 275 and under is much more common.
In a 3-phase AC system, the voltage is quoted between lines. To get the voltage from line to ground, you have to divide by the square root of three, so 400kV lines are 230kV to ground. The lines are far enough apart that it's the voltage to ground that matters for corona purposes.
I have heard a lot of noise from 132kV lines on the coast. The insulators get encrusted in salt and sizzle away nicely. (Not "nicely" from the point of view of the power company, of course.) But looking at them at night, I couldn't see anything.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I've stood 30 feet under the power lines coming out of tonowanda coal building. I'm not sure what the voltage was, but I could hear the crackling corona quite loudly and it was also pulsating at 60hz. I could also feel the field via the hairs on my arm. It was quite scary actually. I imagine they must glow like neon at night.
For those that want to determin the voltage/current: 3x 3" thick Al lines, 6 feet apart, hung from 3' insulators.
Registered Member #3040
Joined: Tue Jul 27 2010, 03:15PM
Location: South of London. UK
Posts: 237
Steve McConner wrote ...
You'll be lucky if you see it in England. The highest transmission voltage we use in the UK is 400kV, and that's for the "Supergrid". 275 and under is much more common.
Pop quiz, I once stood about 2 feet away from an energised supergrid line without any special protective precautions. It was quite warm. Where was I ?
Registered Member #3040
Joined: Tue Jul 27 2010, 03:15PM
Location: South of London. UK
Posts: 237
Grenadier wrote ...
Wow, that's pretty cool.
A little OT, but once I heard of a guy who got free power by running lines // to the transmision lines on his property. They induced current in his lines, and since they did not cross nor contact the transmission lines it was completley legal. Smart man.
Some years ago a farmer in the UK buried a coil in a field under a transmission line and got prosecuted for stealing power. Smart lawmakers
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Corona on 750KV transmission line
