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Old 01-07-2017, 09:19 PM   #1
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Default Transformer Replacement

35kv to 480/277V 5000 kva, 36,000 lbs,

11.5 hours in the cold and snow I am beat.
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Old 01-07-2017, 09:25 PM   #2
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Wow. That is really cool! Really cold looking too!
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Old 01-07-2017, 09:34 PM   #3
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Cha-ching.

And the ex ain't getting none of it.....
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Old 01-07-2017, 09:38 PM   #4
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Thats a long day in the cold! Don't really miss those days!
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Old 01-07-2017, 10:19 PM   #5
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Not exactly a wall-wart.
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Old 01-07-2017, 10:21 PM   #6
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How did it burn up?
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Old 01-07-2017, 10:59 PM   #7
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Hurray for outdoor MV dry-types, the dumbest idea ever. I hope they at least opted for encapsulated windings on the replacement.
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Old 01-08-2017, 08:59 AM   #8
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Hurray for outdoor MV dry-types, the dumbest idea ever. I hope they at least opted for encapsulated windings on the replacement.
I agree as has everyone that has been involved with this project. The new transformer is a cast coil.

Placing them on the roof was not all that brilliant considering there is all kinds of open space on this property.
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Old 01-08-2017, 09:08 AM   #9
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How did it burn up?

During the blizzard last winter, the transformer failed, the possible reasons

35 years old
dry type out doors
possible snow getting into the cabinet
The fire pump blew-up during the blizzard, there was no reason the fire pump should have been running.
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Old 01-08-2017, 09:14 AM   #10
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Quote:
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During the blizzard last winter, the transformer failed, .
and they waited till this winter to replace it?
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Old 01-08-2017, 09:15 AM   #11
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Nice job, awesome cranes (love to hear what they cost). Too much time outside in the cold for my liking nowadays. Carhartt's and coffee days.
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Old 01-08-2017, 09:33 AM   #12
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Quote:
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35kv to 480/277V 5000 kva, 36,000 lbs,

11.5 hours in the cold and snow I am beat.
We changed out a cast/coil like that and let the transfer company dispose of it for the scrap weight.
We found that shipping it out cost more than what it was worth to anyone at the time.
Ours was an indoor unit substation, the transfer company received it, brought it to the site, removed the old one, replaced the new one and hauled off the old one.
All we had to do was determ and re-terminate.
Did you scrap the old one?
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Old 01-08-2017, 09:59 AM   #13
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Transformer eh? Is that an Autobot or Decepticon?
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Old 01-08-2017, 10:11 AM   #14
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Transformer eh? Is that an Autobot or Decepticon?
Autoinstantdepositicon!
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Old 01-08-2017, 11:10 AM   #15
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We changed out a cast/coil like that and let the transfer company dispose of it for the scrap weight.
We found that shipping it out cost more than what it was worth to anyone at the time.
Ours was an indoor unit substation, the transfer company received it, brought it to the site, removed the old one, replaced the new one and hauled off the old one.
All we had to do was determ and re-terminate.
Did you scrap the old one?

We are the GC, hired a rigger he handled everything except disconnecting, reconnecting, testing, customer was responsible for the roofing .

Took this long to work out all the details. Building was for sale, owner was subdividing their company.

Had a similar job last year from start to completion 12 weeks. In that job the original contractor used cable tie, sticky backs to run control wires over the 34 KV terms. During summer the sticky backs came loose and the conductors fell on the HV terms....KA_BOOM
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Old 01-08-2017, 12:56 PM   #16
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Had a similar job last year from start to completion 12 weeks. In that job the original contractor used cable tie, sticky backs to run control wires over the 34 KV terms. During summer the sticky backs came loose and the conductors fell on the HV terms....KA_BOOM
There's a name for a guy that does that kind of work.
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Old 01-08-2017, 01:41 PM   #17
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Brian at least you had a crane to lift it and folks who knew how to hook it up.

A few years ago we had a plant outage to upscale our main transformer. It fell in the middle of a POCO strike but the rep. said no problem. They show up with a zillion trucks, workers and a crane. So we pulled the plug and went for it, as about 100 of us standing by with our fingers crossed.

Only one POCO had used gloves, boots and hardhat, which made me very nervous.
Everybody else was office staff!

Well the crane couldn't lift the transformer but we had a "good ole boy" with a crane working in the back of the plant. One of the "crew" was a VP, with a checkbook. So, bubba did the lift, grinning all the time.

Well once The POCO was done we had to have the two new automatic power transfer switches checked out by a factory rep. He showed up without hardhat, safety glasses, boots or tools or test equipment.

He said he had been doing this so long he didn't need a torque wrench and could he borrow a megger?

Leaving it in it's cardboard box he placed it on the buss work. After a few minutes he declared that our new wiring was bad and had to be replaced. Well we had (8) 500mMCMs/per phase & (8) more 500MCM for the neutral in direct buried for 250 ft and we had to tear it all up.

I noticed where he placed the megger and asked him to please take it off the buss work, and check again. Everything then rung out OK. Without even a "sorry" he blessed the installation and jumped on a plane headed north.
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Old 01-08-2017, 03:37 PM   #18
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Jesus, that's seriously painful to read.

We had one of our competitors tell a customer that they had a ground in a 30MW 13.8kV generator stator and it needed a rewind. Thankfully the customer asked for a second opinion:

The dumbasses had meggered it with all the leads connected. Well, yeah, when you're tied to a distribution bus with two wye connected power transformers and a half dozen grounded PTs, your megger is gonna find a "ground fault."

I hate button-pushers: You can buy the fanciest equipment in existence but if you have no idea what you're doing, that gear is worthless.
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Old 01-08-2017, 05:02 PM   #19
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I bet your client was pretty happy they called you
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Old 01-08-2017, 05:15 PM   #20
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Quote:
Originally Posted by Semi-Ret Electrician View Post

He said he had been doing this so long he didn't need a torque wrench and could he borrow a megger?

Leaving it in it's cardboard box he placed it on the buss work. After a few minutes he declared that our new wiring was bad and had to be replaced. Well we had (8) 500mMCMs/per phase & (8) more 500MCM for the neutral in direct buried for 250 ft and we had to tear it all up.

I noticed where he placed the megger and asked him to please take it off the buss work, and check again. Everything then rung out OK. Without even a "sorry" he blessed the installation and jumped on a plane headed north.
Quote:
Originally Posted by Big John View Post
Jesus, that's seriously painful to read.

We had one of our competitors tell a customer that they had a ground in a 30MW 13.8kV generator stator and it needed a rewind. Thankfully the customer asked for a second opinion:

The dumbasses had meggered it with all the leads connected. Well, yeah, when you're tied to a distribution bus with two wye connected power transformers and a half dozen grounded PTs, your megger is gonna find a "ground fault."

I hate button-pushers: You can buy the fanciest equipment in existence but if you have no idea what you're doing, that gear is worthless.
Unfortunately they walk among us, self proclaimed experts. The over paid under experienced 'tech reps'. I haven't met many that knew there a-hole from a gopher hole.
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