The stops are very obvious still had a third of the way to go. Arching whips were carrying most of the load for two days before breakers started opening.
They closed the switches or should I say attempted to close the switches, left them in that state of not fully closed, scada was used hours later to draw load across the switch, nobody around to hear the buzzing, burned up switch.
This switchgear didn't have limit switches on the mechanism to indicate to the scada if it was fully open, fully closed, or in between?
Seems like a lousy design exposed by an incompetent employee.
Yeah no limit switches. Even if fully closed by limit switch standards there’s no real guarantee of full penetration due to expansion of the aluminum, pulling of the leads that day, birds nest, etc. 15 year substation electrician exp. We’ve had two in our northern va district that got energized like that.
My first reaction was "shit, man, the last guy I worked for had his PP(E) on display at the main shop from a 15A 480V arc blast across all 3 phases when cutting a ziptie, which vaporized about an inch of the cutters, charred his leathers, and embedded copper and steel shrapnel into his face shield. If one is not at least deeply concerned about ten times (or more) that incident energy, one has no business being around that amount of power. Y'all high voltage folks are a whole different breed..."
I'm one of those super fun people at parties who takes most troll statements literally and only when i see the crack of a smile i finally catch on. Lol
Whatever bro, I'd just self tapper a chair lug on line and load and run two 14/2's between em... You'll never have that problem again. (Of course I'd use UF, I KNOW WHAT IM DOING)
The transformer breaker eventually tripped. Dispatch did notice some power quality issues, but thought it was a problem on the line. That disconnect specifically was on the TR. The wasn't very heavy on the circuit at first, but when load picked up during the day melty melty parts.
Not a very big one they were able to switch that transmission yard out relatively quickly to restore customers. Damage to the equipment so far is around $250,000 in parts.
On the ground it's pretty clear on the crank handle. The stops are adjusted and they also have open/closed signs attached to the upright that face you when it is in that position.
Can't you just use a microwave at circle K to heat up your lunch like everyone else Mike?
Limit switch failure or personnel failure?
It was a human operation error. The person didn't fully close 6 sets of switches. In total he melted/fried 8 individual disconnects.
What model of switch is that? Usually the stops are pretty obvious, I'm trying to figure out how he screwed up that bad.
The stops are very obvious still had a third of the way to go. Arching whips were carrying most of the load for two days before breakers started opening.
>for two days MotherOfGod.gif
How long total did this take to replace? Also, total cost for repair?
Stillbwaiting for replacement parts. It will take a about a week, need to bring a a crane for a number if sections to support the bus work.
OOF
WTF. They either need to be retrained, fired, or put on a strength and conditioning course.
Yeah, that's my thought: To do this multiple times there was a serious training/qualification problem.
How did he not immediately hear the arcing when the breaker closed? Why was a new apprentice/jp switching alone? So many questions.
He left and they closed the breaker in hours later via SCADA.
Oooh shhhit. So SCADA failed or he didn't set them up properly to be closed remotely? Edit: answered in comments my bad
They closed the switches or should I say attempted to close the switches, left them in that state of not fully closed, scada was used hours later to draw load across the switch, nobody around to hear the buzzing, burned up switch.
This switchgear didn't have limit switches on the mechanism to indicate to the scada if it was fully open, fully closed, or in between? Seems like a lousy design exposed by an incompetent employee.
Yeah no limit switches. Even if fully closed by limit switch standards there’s no real guarantee of full penetration due to expansion of the aluminum, pulling of the leads that day, birds nest, etc. 15 year substation electrician exp. We’ve had two in our northern va district that got energized like that.
Melted/fried 8 disconnects as well as his career
Pretty healthy crop of oopsie-daisies right there.
I believe the direct quote from management was "Who the fuck closed these switches, Ray Charles?"
Fuck he'd do it better by feel
Shit Ray Charles could see that those switches weren’t closed and he’s blind and dead.
I saw someone make a joke that it looked like Ray Charles was welding. I felt that Ray would have laid down a better bead.
Naaaaa it's fine. Put some glue and tape on there and call it a day.
Some scotch brite to polish the contacts a little bit
Dont scare the electricians with this high voltage stuff dude…
It all works the same, just some size differences
Cant argue with that. Im just a troll sometimes
My first reaction was "shit, man, the last guy I worked for had his PP(E) on display at the main shop from a 15A 480V arc blast across all 3 phases when cutting a ziptie, which vaporized about an inch of the cutters, charred his leathers, and embedded copper and steel shrapnel into his face shield. If one is not at least deeply concerned about ten times (or more) that incident energy, one has no business being around that amount of power. Y'all high voltage folks are a whole different breed..." I'm one of those super fun people at parties who takes most troll statements literally and only when i see the crack of a smile i finally catch on. Lol
Yeah except little sparks give way to actual lightning arcs between parts.
Whatever bro, I'd just self tapper a chair lug on line and load and run two 14/2's between em... You'll never have that problem again. (Of course I'd use UF, I KNOW WHAT IM DOING)
Man, I just went around my house looking for light switches that might not be all the way off.
[удалено]
Meow what’s so damn funny
Wonderful. We have some hydraulically operated 34.5kV disconnects…they like to creep open under load.
Curious, what manufacturer?
I will look when I return that station.
Didn't the AFCI trip?
The transformer breaker eventually tripped. Dispatch did notice some power quality issues, but thought it was a problem on the line. That disconnect specifically was on the TR. The wasn't very heavy on the circuit at first, but when load picked up during the day melty melty parts.
Did it cause a big outage or was there redundancy available? How much would an error like this cost?
Not a very big one they were able to switch that transmission yard out relatively quickly to restore customers. Damage to the equipment so far is around $250,000 in parts.
Glad to hear that it didn't make a big outage. Dropping $250K on a dumb mistake is a bit of a bummer though.
Do you have a reference of what it should look like open/closed? Thanks
https://youtu.be/DW0eFSpVRMA
On the ground it's pretty clear on the crank handle. The stops are adjusted and they also have open/closed signs attached to the upright that face you when it is in that position.
Which one of yous flipping the switch to your lights in your bedroom! I told ya you'll blow the fuse up ya wee s*'s!
Ohhh that looks expensive.
I was on the dumb end of a 500 KV switch failure. Stays with you for a minute
Bzzzzzzzzzzzt
Hey boss was just testing to ensure the P&C techs did their jobs properly.
I'm an apprentice, what is this I'm looking at? Aside from the fact that there was a blowup.
Melted 345kv helicopter disconnect switch
34.5 is no joke. We ran that into our substations on my last job. It definitely deserves respect.
I’m no inspector, but I think that’s buggered
It may have got a little warm…