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Pole mount XFMR #139258
10/25/03 09:00 PM
10/25/03 09:00 PM
R
ryanjuk  Offline OP
Member
Joined: Oct 2003
Posts: 25
N/A
Hello,

I just found this picture on my computer, didn't know if you'd be interested in it, so I'll post it anyway.

[Linked Image]

I found it behind a high-school in my area.

I believe that is 11kV coming in from the right, correct?

What are the cables on the left hand side doing?

Three phases + Neutral, and?

Thanks,
Bye [Linked Image]

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Re: Pole mount XFMR #139259
10/25/03 09:07 PM
10/25/03 09:07 PM
R
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
What a great name you have!!!!!


Ryan Jackson,
Salt Lake City
Re: Pole mount XFMR #139260
10/25/03 09:17 PM
10/25/03 09:17 PM
R
ryanjuk  Offline OP
Member
Joined: Oct 2003
Posts: 25
N/A
[Linked Image]

Re: Pole mount XFMR #139261
10/26/03 03:12 AM
10/26/03 03:12 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
ryanjuk,
Welcome to ECN!.
That's a good pic.
My best guess would be that it's a Pilot wire for the Hot Water Ripple control or for controlling Street-Lighting

Re: Pole mount XFMR #139262
10/26/03 10:06 AM
10/26/03 10:06 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Hi Ryan, and welcome to ECN.

Yes, that looks like 11kV coming in at the top. There are clearly two sets of fuse cut-outs on the secondary side. I would guess that those on the right-hand pole go to an underground feeder.

The 5th-wire arrangement used to be employed here in the past for street lighting. There may be a few places still using the system, but it's been a long time since I've seen it. Some old poles still have the fifth bracket/insulator on them, but in most cases the extra conductor was removed many years ago.

Whereabouts in Britain is this photo from?\

Re: Pole mount XFMR #139263
10/26/03 06:21 PM
10/26/03 06:21 PM
R
ryanjuk  Offline OP
Member
Joined: Oct 2003
Posts: 25
N/A
The photo is from Southern Scotland [Linked Image]

If it were for street-lighting, would the 5th wire just become live when it got dark?

Re: Pole mount XFMR #139264
10/26/03 07:11 PM
10/26/03 07:11 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Ryan,
Yes this is correct,
Most street lighting systems are either controlled by a Photocell or by Electronic timer. [Linked Image]

Re: Pole mount XFMR #139265
10/26/03 10:39 PM
10/26/03 10:39 PM
G
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
OK, I hate to throw "stuff" in the game...... or maybe I don't. [Linked Image]

If I saw that in this country, I'd be thinking 5 wire/2phase, did they ever USE that across the pond?????

Re: Pole mount XFMR #139266
10/26/03 10:47 PM
10/26/03 10:47 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
George,
Just trying to think.
How would that be configured?. [Linked Image]

Re: Pole mount XFMR #139267
10/27/03 02:04 PM
10/27/03 02:04 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
I'd be thinking 5 wire/2phase, did they ever USE that across the pond?????

I can't say it was never used in public distribution, but if it was it must have been confined to the early days.

LV distribution standardized pretty early on with 3-wire DC and 4-wire 3-phase wye AC.

Ryan,
If you're in the area, can you see if there is anything actually connected to that fifth (bottom) wire on the pole?

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