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Re: Old Switchgear Photos #104566 03/13/03 11:40 PM
Joined: Aug 2002
Posts: 1,081
T
ThinkGood Offline
Member
Dave:

Thank you for taking the time to photograph as well as write about the old gear. I admire the fact that everyone put their training (and common sense, no doubt) to practical use. What a story!

2017 / 2014 NEC & Related Books and Study Guides
Re: Old Switchgear Photos #104567 03/14/03 03:33 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
WebS — That was a very interesting account and some killer images. Without pictures, many readers would find such a description almost unfathomable. Indeed, a crucial part of energized {or not proven deenergized} electrical-equipment safety is knowing when to “step back.”

By any chance, was this what you found feeding it? ;-)
[Linked Image]
Remember that one from: https://www.electrical-contractor.net/ubb/Forum5/HTML/000253.html ?

Some days when you get out of bed, it’s hard to imagine what’s in store for the day...




[This message has been edited by Bjarney (edited 03-14-2003).]

Re: Old Switchgear Photos #104568 03/14/03 06:31 PM
Joined: Feb 2003
Posts: 138
W
WebSparky Offline
Member
Thanks to all of you for your comments!

Heck, you call that a transformer!
Naaah!
This is a transformer!

[Linked Image]

This is the Y-Delta 11,400V / 250V transformer that supplied the old switchgear. It stands 85" tall and is oval shaped. It's width is 64" and it's depth is 28". This is a view of the load side wires. I'm guessing they are 1500kcmil. type R or RW insulation. You can see the high voltage wires over the top and the white rectagle is the high voltage fuse box. The dark wet looking areas that you see is rain water!



[This message has been edited by WebSparky (edited 03-14-2003).]


Dave
Re: Old Switchgear Photos #104569 03/14/03 06:53 PM
Joined: Feb 2003
Posts: 138
W
WebSparky Offline
Member
And the rating plate.

[Linked Image]


Dave
Re: Old Switchgear Photos #104570 03/14/03 06:55 PM
Joined: Feb 2003
Posts: 138
W
WebSparky Offline
Member
High voltage POCO air splices. Interesting how they enclosed the high voltage switches in a brick free standing enclosure. Last summer after a heavy rain, we opened the door to check what the "sparking noise" was. (notice the black color of the cieling) It looked like the computer generated lightning streaks, light blue color, all over the ceiling and walls, except it was real voltage seeking ground. Smelled like ozone. We closed the door and suggested that the company phone a roofing contractor right away!

[Linked Image]




[This message has been edited by WebSparky (edited 03-14-2003).]


Dave
Re: Old Switchgear Photos #104571 03/14/03 06:59 PM
Joined: Feb 2003
Posts: 138
W
WebSparky Offline
Member
The overhead load side bus system. Notice the 9 wires leaving the building wall through ceramic tubes. Remember, all of this is protected by the high voltage fuses only! From here they run through the air overhead to the next building with the first means of disconnection. They cross a 25' wide driveway/loading dock and at the lowest point of the "sag" they measure 11'! Not bad considering they exit the building at 9"8"!


[Linked Image]


Dave
Re: Old Switchgear Photos #104572 03/14/03 08:32 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
Based on the transformer label with all the secondary bushings {external connections} you should be able to reuse that nice 95-year-old transformer! It looks like it has dual-secondary coils per phase, so it would be Duck Soup to change the existing paralleled 240V-delta arrangement to series for the building’s new-and-improved 480V service. You’ll be an instant hero with all the money you saved! ;-)

Re: Old Switchgear Photos #104573 03/14/03 09:23 PM
Joined: Nov 2001
Posts: 273
C
circuit man Offline
Member
i know of a power plant that has old switch boards similar too this. around he 30's i guess. was used to power a old cotton mill.now powers part of the city. it's a hydro plant. old slow moving gennys. but something to admire in the quality that was put in to it. but not very safe by today's standards.

Re: Old Switchgear Photos #104574 03/14/03 09:28 PM
Joined: Nov 2001
Posts: 273
C
circuit man Offline
Member
hey web sparky, what KVA was this puppy?what did it weigh?like ya said "here's a transformer".GE "we bring good things to life."

Re: Old Switchgear Photos #104575 03/14/03 09:55 PM
Joined: Feb 2003
Posts: 138
W
WebSparky Offline
Member
Bjarney;

You're right. One problem. POCO owns it.
Actually, I'm glad they own it! Really glad.
First one I've seen with this type of windings.......very flexable. One interesting thing I've never noticed or paid attention to before is that the "C" phase windings are shown wound opposite of the other two and the wiring diagram shows the "A" phase is connected the same as the "C" phase. Seems odd. I'm guessing harmonics canceling?

circuit man;
Hummm........I believe it's a 400KVA. Imagine the fault current!

It is certainly the largest one of this type that I've had the pleasure of walking next to.

One thing though...... These vaults always get my full attention when I'm in 'em. I look forward to the time when all of these old POCO vaults are replaced.


Dave
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