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: Hi,
: I just found your 'high voltage arcs & sparks' video download section.
: This is utterly incredible and I never thought I would see something like
: this on video. I was lucky enough to experience a 500kV disconnect 'hot'
: open on one phase to an unloaded transformer, in Virginia. This was not a
: rotary switch, but a horizontal-to vertical knife-blade type, simular to
: those on your '345kV' video, but this one has large metal arc 'globes' on
: the end of the blade and on the switch cradle. The resulting arc was much
: like the one you have here on video, but was ungodly loud to experience in
: person. A faulty rotary sf6 puffer switch was to blame, all have been
: replaced. These were the 'old-style' types with the giant beer-keg looking
: barrel atop the long bushing. These are rapidly dissapearing now with the
: event of the new smaller horizontal high pressure bottles. BTW, I notice
: on the main interuptor stacks in a 765kV station 100 miles to my
: southwest, these are 6 in series per phase. IMAGINE watching a 765kV arc!
: I was wondering on the 'second largest jacobs ladder' voltage. Is that
: meant to be 34.5kV? The insulator stack is way too short for 345kV.
: Please feature more of these type videos if you can find them. Also I am
: looking for another utility-made video on a helicopter disaster. I'm told
: it was shown on TV a few years back: it shows the little coptor w/platform
: and lineman in his suit approaching and coupling to a phase of (what was
: said to be 800kV). Everything is OK until the copter gets to close and the
: blades get close to the top mounted ground wires. The full load arc (only
: for a split second because sf6 interuptors upstream instantly killed the
: power) kills the copters pilot, but the poor lineman on the platform was
: the worst, the voltage went directly through him, and I'm told he actually
: exploded into pieces (I assume the amperage caused his body fluids to
: flash to steam) I have never seen this video, but have heard others
: talking about it. Do you know of it?
: And your substation explosion video is amazing. That 'low voltage' side
: arc must have been anywhere from 19.9kV up to 33 or more kV. It is a
: violent & nasty sounding arc, and all the black smoke coming up before
: the transformer let go, must have been the arc working on a circuit
: breaker or small transformer, or something with oil. As I am NOT a
: lineman, but only a 'fan' of ehv/uhv electricity, tell me about the
: 'expulsion fuse' that finally cut off the high-voltage. I would like very
: much to know how it works. I note that it only goes once the transformer's
: oil plume ignites, as fire is a conductor, and it looks like the fire
: actually started away from the arcing fault, nearer to the hV side of the
: station. Wow! Thanks, for any help you can give me here, and KEEP UP the
: good work!
: Fred
:
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