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Thread Number: 91562
/ Tag: Other Home Products or Autos
Miracle- Power Reamained On In Part Of Venice |
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| Post# 1160817 10/1/2022 at 14:57 (431 days old) by chetlaham (United States) | ||
This video raised my mood giving me hope and inspiration. Despite the aftermath destruction power remained on at 0:14, 0:32, 0:49, 0:54, and 1:14 in this small portion on Venice Florida. There is something about the hinged globe coming undone on a street light while still being lit. I wish all power systems behaved like this during storms. This has been my dream for sometime and I hope to one day see service continuity being the norm rather than an exception.
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Post# 1160818 , Reply# 1 10/1/2022 at 15:03 (431 days old) by Tomturbomatic  (Beltsville, MD) |
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The Weather Channel ground crew showed that downtown Sarasota development on the air during the storm. It is a newer development with underground electric service. | ||
| Post# 1160819 , Reply# 2 10/1/2022 at 15:28 (431 days old) by chetlaham (United States) | ||
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| Post# 1160890 , Reply# 4 10/2/2022 at 07:24 (431 days old) by neptunebob (Pittsburgh, PA) | ||
Rex, if power lines are all underground and the waterproofing has a leak and there is a flood isn't it possible to short out the circuit and electrocute anyone nearby? I would also wonder if it might be harder for a utility to do a "black start" from no electricity at all, as some Florida utilities might have to do.
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Post# 1161205 , Reply# 7 10/5/2022 at 22:30 (427 days old) by SudsMaster (SF Bay Area, California) |
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 In this part of California, we don't get hurricanes, or even tornadoes.
We can get earthquakes, but those are few and far between, at least the Big Ones. And unlike hurricanes, they are far more difficult to predict. Some might argue, impossible to predict. The best we can do is to reinforce our buildings, bridges, freeway overpasses, etc.
Baby quakes don't count.
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| Post# 1161268 , Reply# 8 10/7/2022 at 04:01 (426 days old) by chetlaham (United States) | ||
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Underground fed by Overhead
For rural and for most suburban circuits-yes.
But you can, and do have cases where the main feeder from the substation is underground all the way up to the pad mounted transformer serving the customer. Basically you've got a 750MCM EPR 600 amp back bone feeding into PMH pad mounted switches where the circuit is then fused down to 200 amps. From there 4/0 AL URD loops in and out of pad mounted transformers. Simple, elegant and easy to restore service if a cable burns up. Here is what I have in mind, see schematic on page 9: www.sandc.com/globalasset... Auto source transfer for the primary feeder: www.sandc.com/globalasset...
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| Post# 1161269 , Reply# 9 10/7/2022 at 04:26 (426 days old) by chetlaham (United States) | ||
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@neptunebob: The 13800 volt cables have a bare copper screen around them.
www.southwire.com/wire-ca... The idea is that if the primary insulation (#3) fails, it will instantly arc to the neutral conductor. The impedance (combined electrical admittance) of the hot and neutral conductors are selected so that a fault will cause 1000s of amps of current to flow which will blow the upstream fuse or trip a breaker in a matters of a few cycles. (About 1/60th of a second). That is fast! This immediately removes any potential danger while indicating that the circuit had an insulation breakdown. Further, automatic switching can isolate the faulted cable and restore power via unaffected portions of the system. I have an entire underground system planned out for the United States- if people could just understand what underground distribution can bring to civilization overhead would disappear in 7-10 days. Regarding blackstart in Florida I don't think the transmission system to the North of the Hurricane was effected, so they can route power south as transmission lines are brought back into service. Either way, in my world, all generating plants have blackstart system with N-2 redundancy. :) | ||
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