Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Manhattan Partial Blackout 2
- Thread starter Mbrooke
- Start date
Palletjack
Electrical
Wow, that’s a lot of information to digest. I’m not going to read through it...
I did look on google, and while I’m not familiar with all the stations and their locations, I did see a couple and saw breakers on the ground. Some had SF6 interrupters, as indicated in your last pictures.
I’m really not familiar with what happened, but here’s a question. Some years back the north had a large power outage. It was started by a tree trimming crew, I believe. They knocked out a feeder, another breaker failed in a station, taking that station out. Stations in parallel now are asked to take on additional load instantaneously. Can’t handle it, causing 50, 51 and 81 relays to open circuits. Something like this prompt this change?
I did look on google, and while I’m not familiar with all the stations and their locations, I did see a couple and saw breakers on the ground. Some had SF6 interrupters, as indicated in your last pictures.
I’m really not familiar with what happened, but here’s a question. Some years back the north had a large power outage. It was started by a tree trimming crew, I believe. They knocked out a feeder, another breaker failed in a station, taking that station out. Stations in parallel now are asked to take on additional load instantaneously. Can’t handle it, causing 50, 51 and 81 relays to open circuits. Something like this prompt this change?
- Thread starter
- #42
To sum it up the West 65th street outage should not have spread (resulted in 5 138kv feeders going down) even if all 5 or 10 transformer protection relays at 65th called for trafos shutting down.
Take a screen pic of those stations, I can immediately tell you what is what.
What prompted circuit switchers being installed at Con Edison area substations was a fire at the Seaport substation in 1990. The transformers could not be shut down without de-energize all 5 138kv supply feeds. Unfortunately when those were de-energized, so was the trade center substation which also takes taps off those 5 feeders.
August 14, 2003 was a bit different. In simple terms several 345kv lines tripped out causing other lines to sag into untrimmed trees also tripping out. The remaining lines began to take on the work of the missing lines, and since more amps = more heat, those lines also sagged and tripped. Voltage in the Ohio area began to fall from all the missing equipment causing generators to shut down. The depressed pocket pulled power from its surroundings causing those to overload and further trip lines and generators. Eventually it triggered a domino effect which spread throughout the North East and Canada.
Take a screen pic of those stations, I can immediately tell you what is what.
What prompted circuit switchers being installed at Con Edison area substations was a fire at the Seaport substation in 1990. The transformers could not be shut down without de-energize all 5 138kv supply feeds. Unfortunately when those were de-energized, so was the trade center substation which also takes taps off those 5 feeders.
August 14, 2003 was a bit different. In simple terms several 345kv lines tripped out causing other lines to sag into untrimmed trees also tripping out. The remaining lines began to take on the work of the missing lines, and since more amps = more heat, those lines also sagged and tripped. Voltage in the Ohio area began to fall from all the missing equipment causing generators to shut down. The depressed pocket pulled power from its surroundings causing those to overload and further trip lines and generators. Eventually it triggered a domino effect which spread throughout the North East and Canada.
- Thread starter
- #43
Old thread- but thought I would add this to the archived history. West 65th st in an old Russian Engineering book. Note that are some translation errors and age based discrepancies.
- Thread starter
- #44
Much thanks to another member for posting this thread:
From David's link, [highlight #FCE94F]a PDF on what caused the West Side Outage[/highlight]:
Much simpler than I previously assumed- just a few missing wires. I'm relived to be honest.
You were correct, One of the Five is what I call a "hot spare" as mentioned by the NERC PDF regarding the incident.
From David's link, [highlight #FCE94F]a PDF on what caused the West Side Outage[/highlight]:
Much simpler than I previously assumed- just a few missing wires. I'm relived to be honest.
Pallet Jack said:
You were correct, One of the Five is what I call a "hot spare" as mentioned by the NERC PDF regarding the incident.
- Thread starter
- #45
Lastly while this thread is closed:
A PDF on what caused the [highlight #EDD400]Astoria Blue Light event[/highlight]:
Sadly, it was not a special at K-Mart like I had originally hoped.![[sad]](/data/assets/smilies/sad.gif "[sad] [sad]")
A PDF on what caused the [highlight #EDD400]Astoria Blue Light event[/highlight]:
Sadly, it was not a special at K-Mart like I had originally hoped.
- Thread starter
- #47
- Thread starter
- #49
NERC released a report. It looks like EM relays were involved and missing wires in the CT circuits.
From what I gather it looks like 65th st did not have circuit switchers installed at the time of the incident which would have greatly "contained" the outages. Either that the trip signal spread further than it should have but nothing is mentioned in the NERC report in regards to circuit switchers.
From what I gather it looks like 65th st did not have circuit switchers installed at the time of the incident which would have greatly "contained" the outages. Either that the trip signal spread further than it should have but nothing is mentioned in the NERC report in regards to circuit switchers.
- Status
Similar threads
- Question
- Locked
- Question
- Locked
- Question
- Locked
- Question