I
ItsASecretDummy
- Jan 1, 1970
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Several hundreths of seconds or possibly 30-60 cycles. no big deal. Colour
of arc depends on the material and temperature involved. AC flashes, even
at light current are not necessarily blue- I have seen many that aren't.
Streamer flashover as an insulator starts to break down is generally
bluish but once a solid arc is established, it is yellow. Blue for
ionization but yellow for follow current in a plasma.
Reverbatory spasm results-why? 100-120Hz pulses- the body won't spasm at
that rate-particularly above "let-go" .
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Possibly -it was a conjecture- neither of us know. However, I have known of
a case where a person in contact with a line did cause tripping and repeated
reclosure. He ended up on the ground with the wire on top of him (7200V) The
interval between reclosures was longer and the current was not enough to
kill him or render him unconcious but did do terrible damage. Rubber boots
burnt through at the ankles, holes in his back -he lived as a basket case.
All due to a combination of drunken bravado and stupidity.
The reclosure conjecture came about from the dead time betweeen pops.
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True but this doesn't mean that some kind of recloser system isn't in use.
Again no information
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His hand was not far enough away between the pops for a 1.5KV arc to
extinguish. I have pulled arcs of 1/2 to 1 inch at 5-10A at 120V. where AC
simply produces a minor spark at the same voltage and current. The current
would have been far less than that but DC arcs are recalcritant . Yes, 25KV
would have arced to him but it is not possible to see if there was a pre-arc
but it was possible to see that it was out momentarily
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Actually, I can't argue with that - which then points to AC.
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And the last of the 1.5KV DC was supposed to be phased out about 7 years
ago.
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Questionable - the video doesn't give the detail well enough to say. As for
a big platform - please note the station building in the background
Agreed- we don't have any information as to where and when, nor, in
particular the actual voltage involved.
So we can both conjecture and blow smoke.
It probably was the 25kV AC then, as I thought they still had both types
of service from the discussions I was reading.
It sure demonstrated what the word power means.