Re: Carbon Monoxide warnings - keep generators outside 20ft away from doors and windows
On 9/1/21 15:07, Haudy Kazemi via NANOG wrote: Several articles have mentioned 8 transmission lines were lost to the hurricane (a single big event event). A casual reader might think 8 lines would offer an 8-way level of redundancy. My WAG is the reality of load vs capacity is more like a N-1 or N-2 redundancy, but that's really just a WAG. It is unclear to me if all 8 lines were damaged by the storm, or if some failed/tripped when loads shifted onto the remaining lines after the first failure occurred (cascading failure). Does anyone know, or has anyone seen, details? Several pictures showing massive steel "cat-style" towers on the ground, as well as news reports that eight transmission lines are down. Also saw a report that they will be isolating the storm area from the grid and bringing in temporary power plant(s), restoring critical load first. -- Jay Hennigan - j...@west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV
Re: Carbon Monoxide warnings - keep generators outside 20ft away from doors and windows
Several articles have mentioned 8 transmission lines were lost to the hurricane (a single big event event). A casual reader might think 8 lines would offer an 8-way level of redundancy. My WAG is the reality of load vs capacity is more like a N-1 or N-2 redundancy, but that's really just a WAG. It is unclear to me if all 8 lines were damaged by the storm, or if some failed/tripped when loads shifted onto the remaining lines after the first failure occurred (cascading failure). Does anyone know, or has anyone seen, details? On Wed, Sep 1, 2021, 16:12 Sean Donelan wrote: > One person has died and at least 27 people are being treated for carbon > monoxide poisoning from portable generators. > > Officials are reminding people to operate portable generators only > outside, 20 feet away from homes, doors and windows. Not in carports, > garages, basements. > > To restore power, Entergy has "islanded" (disconnected) the City of New > Orleans from the regional grid and started a local power plant. The > transmission lines were toppled during the storm, but the cables were > still connected to the terminals. Islanding the city makes sense, but I > don't remember a power company islanding large parts of the grid before. > Public officials are now saying it may be 30+ days to fully restore power. > > Entergy has implemented restoration priority, which means hospitals, > public safety and critical infrastructure will be restored first. Along > with some incidental customers on the same circuits. > > > Customers out of service > > Louisiana - 987,588 > Mississippi - 31,516 > Florida - 21,867 > California - 21,339 > Pennsylvania - 10,415 > > Reminder, Puerto Rico still has not fully recovered from hurricanes in > 2017. Puerto Rico still has rolling blackouts. And yes, Puerto Rico is > an island, so its electric grid is naturally an island. > > The major wireless providers have activated their open roaming agreements, > allowing customers to roam on any working infrastructure from other > service providers. They are also waiving overages and many other feeds in > the affected region. Check your service provider's website for details. > > AT says 82 percent of its network in service in Louisiana. > > First responders say the AT FIRSTNET failed (again) during the > hurricane. > > T-Mobile says 70 percent of its network in service in Louisiana. > > Verizon says it has "gaps in coverage" but its network remains resilient. > I don't know what that means. > > I haven't found reports from cable companies in the region. >
Carbon Monoxide warnings - keep generators outside 20ft away from doors and windows
One person has died and at least 27 people are being treated for carbon monoxide poisoning from portable generators. Officials are reminding people to operate portable generators only outside, 20 feet away from homes, doors and windows. Not in carports, garages, basements. To restore power, Entergy has "islanded" (disconnected) the City of New Orleans from the regional grid and started a local power plant. The transmission lines were toppled during the storm, but the cables were still connected to the terminals. Islanding the city makes sense, but I don't remember a power company islanding large parts of the grid before. Public officials are now saying it may be 30+ days to fully restore power. Entergy has implemented restoration priority, which means hospitals, public safety and critical infrastructure will be restored first. Along with some incidental customers on the same circuits. Customers out of service Louisiana - 987,588 Mississippi - 31,516 Florida - 21,867 California - 21,339 Pennsylvania - 10,415 Reminder, Puerto Rico still has not fully recovered from hurricanes in 2017. Puerto Rico still has rolling blackouts. And yes, Puerto Rico is an island, so its electric grid is naturally an island. The major wireless providers have activated their open roaming agreements, allowing customers to roam on any working infrastructure from other service providers. They are also waiving overages and many other feeds in the affected region. Check your service provider's website for details. AT says 82 percent of its network in service in Louisiana. First responders say the AT FIRSTNET failed (again) during the hurricane. T-Mobile says 70 percent of its network in service in Louisiana. Verizon says it has "gaps in coverage" but its network remains resilient. I don't know what that means. I haven't found reports from cable companies in the region.
