Omega Owners Forum
Chat Area => General Discussion Area => Topic started by: Kevin Wood on 08 October 2007, 14:03:50
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http://s25.photobucket.com/albums/c51/covercloud/?action=view¤t=dc5dc6bf.flv :o
Now, I'm pretty comfortable around things electrical but that even made my flesh creep!
Kevin
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bugger that for lark :o
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no thanks :-/ not for me
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Not a job for a hotdog :o
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Ops.. :o :o What job is that..
I wouldnt do that for any money ! :-?
little mistake and your a cooked meat in burger king..
High voltages tend to pass from the surface of skin..Years ago when father was young burned the hands with high voltage..
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Rubbish player - reset itself half way through and lost what I had already downloaded!!!!
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Awesome. :D
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:o :o :o
Heights and high voltage cables............not on your nelly!!
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beats selling [size=18]FRIES[/size]!!!
;D
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lol.
ask yourself his - How is it that birds can sit on electric power cables without frying themselves?
;)
the same applies for the guy who is on the cables ;)
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Rubbish player - reset itself half way through and lost what I had already downloaded!!!!
worked fine here....
interesting job that....
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sod that for a laugh me and heights dont go and mix electric cables nahhhhhhh
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:)Worked ok here too. A challenging career methinks!
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lol.
ask yourself his - How is it that birds can sit on electric power cables without frying themselves?
;)
the same applies for the guy who is on the cables ;)
There was something about this on Discovery channel or National Geographic a couple of weeks ago and the guys wear special clothing that is more conductive than human flesh and as electricity always takes the shortest path, it travels over the outside of the fabric and never makes contact with the wearer.
As for the little dicky birds, my guess would be that they're not earthed while on the wires therefore they don't complete a circuit
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bet it's not as much fun when wet ... water a little bit more conductive than air ... plus those helicopter pilots gotta to be good to maintain a distance from those cables that the guy can climb on and off them, it's a bit different to dropping someone off on land ... as for the birds, yes they're insulated ... until they move along the line and reach the insulators at which point they get bbq'd ;D
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I was a linesman in the late 70's and can tell you some stories that would make your flesh creep :o
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Shocking, don't do hight's. :o
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The HT I can cope with (have live wired HT before)....the heights I could not do!
I like the way they attach a lead first to equalise the helicopter and wire potentials, nothing to worry about on the the electrocution sides of things as long as there is no route to true earth (which there isnt that high up).
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I bet that helicopter's not fly-by-wire though :o
The potential for upsetting electronics on board must be quite high.
Kevin
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I bet that helicopter's not fly-by-wire though :o
The potential for upsetting electronics on board must be quite high.
Kevin
No....it would need to pass radiated immunity testing as part of the approvals and EMC testing so why would it worry about the spark (RF generated) and HT field....
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Due to design restraints, all helicopters are fly by wire. They have three basic flight controls, the collective, cyclic and anti torque pedals. the collective is like a kind of handbrake thing and is raised or lowered to alter the pitch of all rotor blades collectively (hence the name) used to control lift. The cyclic is the stick that the pilot uses to control the bank and pitch of the aircraft. The anti torque pedals compensate for the twisting effect of the main rotor disc.
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I fancy having a go at that, technically its interesting and challenging and on a fine day the views would be great. Not so sure about doing it on a wet cold day in winter though.
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I was a linesman in the late 70's and can tell you some stories that would make your flesh creep :o
Do it! ::)
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I was a linesman in the late 70's and can tell you some stories that would make your flesh creep :o
dodgy offside calls! always make my flesh creep! ;) ;D
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I was a linesman in the late 70's and can tell you some stories that would make your flesh creep :o
Do it! ::)
Okey dokey hears one. I was working at Fiddlers Ferry power station, we were working on the insulation pots that carry the powerlines.these pots are suspended on large concreate A frames about sixty feet high. To aid access the company hired a large cherry picker which we used as a work platform. We raised the cherry picker and were working away when a CEGB employee shouted up to us pointing at the elbow of the machine. unknown to us as we manouvered the lift part of it had strayed into the next section which was LIVE! carrying 415,000 volts :o :o :o The arm was about 20 feet away from the line, and when you consider that at those voltages electricity can arc 15 feet another few feet and we would have been toast :o
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I heard a few horror stories from some guys I used to work with who install broadcast transmitters. Apparently one guy was working (alone) :o on a transmitter which had 2 3 phase feeds from separate parts of the grid. One supply failed and in the process of switching it over to the other supply he managed to connect both supplies with the consequence that he was trying to supply a small town in Wales using switchgear that was designed to operate a TV transmitter.
It was the last mistake he made, sadly.
Kevin
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Try anything once.........looks like an interesting job, plenty travel :y
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Try anything once.........looks like an interesting job, plenty travel :y
And it keeps you off the streets. ::)
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Try anything once.........looks like an interesting job, plenty travel :y
And it keeps you off the streets. ::)
Close to the edge though ;D ;D
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Try anything once.........looks like an interesting job, plenty travel :y
And it keeps you off the streets. ::)
Close to the edge though ;D ;D
Interesting job with plenty of highs. ;)
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Bet you would get a buzz from that job ::)
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Try anything once.........looks like an interesting job, plenty travel :y
We used to travel all over the country, with a good bunch of lads, and the pay including danger money was brilliant
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Try anything once.........looks like an interesting job, plenty travel :y
We used to travel all over the country, with a good bunch of lads, and the pay including danger money was brilliant
There was a programme on TV the other day about the training for guys who do recabling work. Apparently, they are changing all the overhead power lines in the UK. They are getting £1000 per week.
Not sure it's enough. :-/
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Definitely not enough for a dangerous job like that. Can earn £1000 a week workingin an office or similar very easily.
Matt
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Try anything once.........looks like an interesting job, plenty travel :y
We used to travel all over the country, with a good bunch of lads, and the pay including danger money was brilliant
There was a programme on TV the other day about the training for guys who do recabling work. Apparently, they are changing all the overhead power lines in the UK. They are getting £1000 per week.
Not sure it's enough. :-/
Yeh saw that, the trollys that are suspended between the pylons are fun, especially when its windy. Its not bad leaving a pylon cos your going downhill its when you have to pull yourself on the uphill run that it gets hard work, good for upper body strength though.
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I can remember many moons ago working for Alstom on commisioning of a static Var compensator in islington. The site was next to a canal and was slightly behind schedule.
The national grid guys insisted on taking possesion for one weekend due to a know Var rise in that area due to maintenance work despite the setup not being finished.
We warned them that they would have to visualy inspect all ground contacts (these are used to ground certain parts of the secondaries to allow safe working) to make sure they were off as the status displays and interlocks had not been completed.
They threw the main breaker without doing this whilst the secondary side of the transformer was grounded by the ground contacts.......there was one hell of a bang and the heat boiled the transformer oil and shot it out the vent into the canal.....it wiped out a large section of London.
We were well rewarded for the extra work though....
Interestingly, I ahev measurede 30+V's between supposidly earthed transformer casings before......but earths are a funny things.
The earth for the 2GW cross channel DC link is about 7 milesaway from the site due to the poor soil!
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They threw the main breaker without doing this whilst the secondary side of the transformer was grounded by the ground contacts.......there was one hell of a bang and the heat boiled the transformer oil and shot it out the vent into the canal.....it wiped out a large section of London.
Umm. :o Makes you think. I've let the smoke out of little components before now. Had a reversed electrolytic explode in my face but this is on a slightly different scale :o
Kevin
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The earth for the 2GW cross channel DC link is about 7 milesaway from the site due to the poor soil!
DC?
what voltage?
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Try anything once.........looks like an interesting job, plenty travel :y
We used to travel all over the country, with a good bunch of lads, and the pay including danger money was brilliant
There was a programme on TV the other day about the training for guys who do recabling work. Apparently, they are changing all the overhead power lines in the UK. They are getting £1000 per week.
Not sure it's enough. :-/
That program was filmed 2 mins from my house, at one point they even drove past the garage we bought the CDX from!
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The earth for the 2GW cross channel DC link is about 7 milesaway from the site due to the poor soil!
DC?
what voltage?
A Bipole setup with + and - 400Kv at 2500 amps down each leg (two cables).....It uses a set of 12 pulse thyristor banks (using a star-start and star delta transformer arrangement to creat a 6 phase supply)
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The earth for the 2GW cross channel DC link is about 7 milesaway from the site due to the poor soil!
DC?
what voltage?
A Bipole setup with + and - 400Kv at 2500 amps down each leg (two cables).....It uses a set of 12 pulse thyristor banks (using a star-start and star delta transformer arrangement to creat a 6 phase supply)
That is weird - didn't realise you could convert from DC to AC at such high loads.
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Yes you can.....but, you need AC to be present on the output (i.e. from a local generator set) in order to get it to work.
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The earth for the 2GW cross channel DC link is about 7 milesaway from the site due to the poor soil!
DC?
what voltage?
A Bipole setup with + and - 400Kv at 2500 amps down each leg (two cables).....It uses a set of 12 pulse thyristor banks (using a star-start and star delta transformer arrangement to creat a 6 phase supply)
:o :o :o
Translations anyone...........
Chav speak i have mastered, this is a different ballgame
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1GW :o :o
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1GW :o :o
Close, but no cigar....+ and -400Kv i.e. a PD of 800Kv at 2500 amps....2GW!
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1GW :o :o
Close, but no cigar....+ and -400Kv i.e. a PD of 800Kv at 2500 amps....2GW!
That is a lot - how thick are the cables?
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Not sure on the cable cross section as I worked on the control systems when we did a refit of the protection scheme in the 90's. They are (were) the single longest un-jointed cables ever made at nearly 45kms long and were rated at 280Kv AC (remember this is an RMS figure so peek its 400KV which is effectively the DC insulation rating)
You can see the Uk end next to the M20 motorway at Sellindge here:
http://www.multimap.com/maps/#t=l&map=51.106,0.97701|17|8&loc=GB:52.47012:-1.50653
The H shape building is where the valve hall is (stacks of air cooled thyristors) with one valve hall for each pole on either side and the control room in the centre.