Fireballs reported in east Fort Worth
Fireballs reported in east Fort Worth
(OP)
Does anyone know what happened?
There is also a vidio out there of this.
There is also a vidio out there of this.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Fireballs reported in east Fort Worth
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RE: Fireballs reported in east Fort Worth
RE: Fireballs reported in east Fort Worth
It appears that there are several locations where arcs restrike. The primary one being a bit to the left of the center of the picture. But the restrikes appear to occur at several locations over and over. So I'd guess that the initial lightning caused multiple insulator failures. The arcs restrike at the weakened insulators or arresters due to system voltage transients. Transients due possibly to breaker reclosing events or perhaps just another arc down the line clearing and the circuit voltage overshooting upon recovery. Hence the cascading sets of flashes at various locations on the circuit.
RE: Fireballs reported in east Fort Worth
RE: Fireballs reported in east Fort Worth
overcurrent protection due to depressed voltage under arcing conditions.
A case for voltage sensitive overcurrent protection??
RE: Fireballs reported in east Fort Worth
RE: Fireballs reported in east Fort Worth
RE: Fireballs reported in east Fort Worth
(* I read it on the internet.. must be true)
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(2B)+(2B)' ?
RE: Fireballs reported in east Fort Worth
The overall effect it had on me was one of realizing just how interconnected everything is. One initial problem fomented problems over a wider area. I half expected to see it expand in an increasing circle...
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RE: Fireballs reported in east Fort Worth
Ausphil
RE: Fireballs reported in east Fort Worth
Recently in the area south of Houston there were widespread outages in the League City area due to salt build up on the insulators at certain substations. The salt build up was due to the lack of rain that would have otherwise helped keep the insulators washed and clean. After some frantic power washing of the insulators in several key substaions, most of the major industrial plants knocked off were back on line within a day or so.
Obviously I recognize that East Fort Worth is too far from the sea to have a salt build up problem. That said:
Could this have been due to carbon and/or dust (ash) build up on the insulators due to the plethora of wild fires upwind of the area? To me it seems like were that the case, once a single arching event set off a spike or surge, then others on the ragged edge would then 'torch off' as a result.
Could that be what happened here or has my coffee just failed to kick in yet?
rmw
RE: Fireballs reported in east Fort Worth
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(2B)+(2B)' ?
RE: Fireballs reported in east Fort Worth
Something like: An arc at one point pulls the system voltage down. Once the arc clears, the system voltage rebounds. Much like a switching surge, the rebound causes overvoltages which initiate flashovers at other locations. Its possible that there could be a few second delay from the initiation of an arc to the point at which significant power (and an arc visible at some distance) develops.
It could be the reclose time delay as well. The breaker closing can also generate a switching surge.
RE: Fireballs reported in east Fort Worth