fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
http://www.fark.com/vidplayer/7407308
Notice the green tinge to the light when the copper vaporizes!
Notice the green tinge to the light when the copper vaporizes!
I wonder what caused the explosion?
I didn't see any dimming before it happened. And of course the usual why didn't the OCPDs keep the sub station from blowing up?
Utility transformers usually contain oil. Oil usually starts a fire and burns for an extended time, when transformers truly explode.An arc flash is an explosive event, but many will incorrectly say that a transformer exploded, when it did not.
Utility transformers usually contain oil. Oil usually starts a fire and burns for an extended time, when transformers truly explode.
The bright flash of light and then nothing, is more indicative of the conductors feeding the transformer 'exploding' as they are shorted.
I didn't think about the oil. Just how often does a transformer get hot enough to burn the oil? Don't they generally provide overcurrent protection making this somewhat unlikely?
John Miksad, Con Ed?s senior vice president of electric operations, sat down with The Wall Street Journal on Tuesday WSJ:
What is the single most challenging logistical task facing Con Ed?
The biggest single issue is the equipment explosion?and the resulting problem
that affected our 13th Street substation. We are in there now. We?re pumping
water out of there. And that is a common theme in a lot of this.
All of that is going to start with getting water out of our system. It?s not
only in the way of our access ? it?s also submerged some of our equipment.
We?ve got ? whatever it is ? two, four, six, eight feet of water that?s
sitting there with our equipment under it?We have folks pumping water and then
trying to get in. I think they may even have rowboats in there.
WSJ Do we have a better sense of what caused the
substation explosion?
We do not. We could not get access last night because of the water?.I think
it?s probably most likely flying debris.
Did something actually explode or was this just a major arc flash incident?
All we see in the video is the flash, and have no idea what actually happened.
An arc flash is an explosive event, but many will incorrectly say that a transformer exploded, when it did not.
The news media seems to call every electrical equipment faluire a transformer explosion. During the coverage of Sandy a tree branch shorted across 2 phases on a utlity pole near a reporter. The reporter stated "a transformer just exploded" Live shots during the storm were showing bright blue flashes in the horizion one after the other in variuos states, the anchor man's explanation was that those were transformers exploding all over the towns because they had enough from the storm:lol:
Looks like we need millions of pole top units and substation transformers. Nothing like media "experts" spreading disinformation. And everyone trusts these people to give the truth.:rant:
Exactly why I asked. I can only assume that the video was a substation incident, as I can not tell what it is from the distance in that video.
Based on what I saw Im willing to guess that a part of the 115kv or 23kv (or which ever volage is used) buss or switchgear shorted out. It doesnt look like a transformer explosion because there would be smoke and fire from the oil in the vault transformer. I dont know anything about Con-eds system so I can only guess what failed and why.
I know United Illuminating had to shut down 3 substations in bridgeport ( 2 on Congress street and one in the poquonock section) at the height of the storm due to flooding concerns. CL&P had to build a concrete barrier around a Stamford substation at the south end in 90mph gusts.
If a substation gets flooded while energized the loses are much higher than when de-energized and unfortunetly Con-eds was energized.
The substation is fed by at least 2 345 or 375KV underground, oil-filled cables. They could probably supply enough energy to do significant damage. As I understand it it served 250,000 customers. They were flooded several feet above their design depth. Which would make me think that bushings were partially submerged and probably arced over. With the control wiring flooded out (and breakers not opening), it could be damaged transformers.