ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
UL 508A SPACING
by ale348 - 03/29/24 01:09 AM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (ale348), 302 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rating: 5
Page 3 of 3 1 2 3
#152744 11/30/06 11:08 AM
Joined: Aug 2001
Posts: 7,520
P
Member
I don't know how I missed these threads first time around, but better late than never!

What sort of supply arrangements and loads were/are employed on this sort of installation in terms of voltages?

Would it be all 120V lamps or would some of the larger floods be 240V? 120/208V 3-phase supply, or a 3-wire 120/240V? Or even a 4-wire delta?

#152745 12/01/06 02:39 AM
Joined: Oct 2004
Posts: 806
Member
Hi Paul:

Glad you got to see these to. [Linked Image]

All of the lamps are 120 volts, IIRC there are no 240 volt loads served by either this board or its mate on the stage.

The supply is also IIRC 3 phase delta. (The poco here in So Cal which also serves the island had a huge love affair with delta, even using it extensively at the distribution level, 4-34.5 Kv.)

As I'd mentioned, I had a chance to see the main vault room. The main switchgear was mostly modern circuit breakers, adapted to an original bus structure from the old gear. It not only gave me the "willies" being in the same room, but the heat coming from it was considerable. [Linked Image]

The transformers serving the building were benind a concrete dividing wall, with "Pillbox embrasures" (6x12 inch slots) so I could peek in there too. 34.5kV incoming, a trio of individual submersible type transformers wired with what looked like XLPE concentric cable primary and three large (500Kcmil?) secondary per leg.

The interior of the vault showed extensive blackening from a secondary cable fire and the failure of the original oil filled transformer some years ago.

If I can get to the vault again on my next trip, I'll try to get pics.


Stupid should be painful.
Joined: Oct 2004
Posts: 806
Member
Bumped up to tie in with the "What was this DC generator for?" thread...


Stupid should be painful.
Joined: Oct 2004
Posts: 806
Member
Bumped up because it's been over 8 years for this thread..:)


Stupid should be painful.
Page 3 of 3 1 2 3

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5