Re: Utility Jacobs Ladder!
Posted by Bert Hickman on 12/27/2007, 9:15 pm, in reply to "Utility Jacobs Ladder!"
--Previous Message-- |
: Hi Bert,
: I don't know if you allow youtube links to be pasted on your message
: board, but if so, get a load of this one! It is an actual Jacob's ladder
: behind someone's house on a fallen line, probably going up one phase and a
: ground line. You can see and hear the arc as it climbs, extinguishes and
: restarts and climbs again, over and over. Finally it climbs a bit too high
: and hits another phase, there is a brighter arc and a much louder
: arc-sound and spark-shower before an upstream recloser does its thing. It
: then restarts a few seconds later. And if you don't allow these links, at
: least check it out yourself! I have never seen a super high-amperage
: ladder like this one.
: I have been exploring youtube for utility disasters and have found lots!
: This is the neat thing about video cameras everywhere and youtube to show
: them! One was taken by Silverbrook Highschool students as a violent arcing
: fault destroys the substation behind the school. Another, taken from a
: highrise looking down on a large substation (looks like 230kV) There is a
: very large arc (like your 500kV video on this site) on what looks like one
: phase of an open disconnect. This looks to be a much brighter, hotter arc
: than the 500kV one. Another neat Jacob's ladder video is what looks to be
: a tall, pole mounted set of disconnects, on a 45kV line. The disconnects
: are open, however the bottom phase has a persistant arc between the open
: switch elements. It starts, is pushed out by the wind, and becomes long,
: maybe about ten to fifteen feet long, then extinguishes and starts again,
: over and over. Finally you see it rise straight up to the phase above it.
: There is a violent, blinding blue vertical arc as it comes in contact with
: the above phase, a super-loud, jagged arc sound and a shower of sparks. An
: upstream recloser extinguishes the arc and remains open, finishing the
: video. Yet another horrfying video is what looks to be a 440 volt cabinet.
: Two workers are working on something within the open doors of the cabinet,
: when suddenly, there is a violent arc which throws both the men back, and
: one of them is on fire!!! Happily the guy on fire is able to rip off the
: burning clothes and he appears to be shaken, but alright.
: One of my favorites is a TV camera crew interviewing a policeman in an
: ice-covered neighborhood. While the cop is talking and just behind him,
: you can see an ice-covered treelimb slowly swing down, and suddenly there
: is an incredibly violent, bright blue-green, loud phase-to phase arc and
: he jumps like he was shot!! It is followed by three more faults down the
: line in quick succession. NEAT stuff!
: I also found a video that looks to be another angle of your 230kV
: disconnects being open. The day is bright and sunny in this video. The
: switches are slowly opened until the three swing rods fall open and there
: are the three long arcs, which extend until one of them hits a neighboring
: phase and it pops out. There must have been a few cameras recording this
: event? I have found many other videos on youtube also, with other utility
: faults and explosions. You should post them on your site!
: Fred Berry
Some of those sound very interesting - if you would, post some of the links for some of these ones you described above!