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#139258 - 10/25/03 07:00 PM Pole mount XFMR
ryanjuk Offline
Member
Registered: 10/05/03
Posts: 25
Loc: 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.



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
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#139259 - 10/25/03 07:07 PM Re: Pole mount XFMR
Ryan_J Offline
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Registered: 08/19/03
Posts: 1374
Loc: West Jordan, Utah, USA
What a great name you have!!!!!
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#139260 - 10/25/03 07:17 PM Re: Pole mount XFMR
ryanjuk Offline
Member
Registered: 10/05/03
Posts: 25
Loc: N/A
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#139261 - 10/26/03 01:12 AM Re: Pole mount XFMR
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: 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
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#139262 - 10/26/03 07:06 AM Re: Pole mount XFMR
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: 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?\
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#139263 - 10/26/03 03:21 PM Re: Pole mount XFMR
ryanjuk Offline
Member
Registered: 10/05/03
Posts: 25
Loc: N/A
The photo is from Southern Scotland

If it were for street-lighting, would the 5th wire just become live when it got dark?
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#139264 - 10/26/03 04:11 PM Re: Pole mount XFMR
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Ryan,
Yes this is correct,
Most street lighting systems are either controlled by a Photocell or by Electronic timer.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
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#139265 - 10/26/03 07:39 PM Re: Pole mount XFMR
George Corron Offline
Member
Registered: 05/16/01
Posts: 717
Loc: Lorton, Va USA
OK, I hate to throw "stuff" in the game...... or maybe I don't.

If I saw that in this country, I'd be thinking 5 wire/2phase, did they ever USE that across the pond?????
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#139266 - 10/26/03 07:47 PM Re: Pole mount XFMR
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
George,
Just trying to think.
How would that be configured?.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
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#139267 - 10/27/03 11:04 AM Re: Pole mount XFMR
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: 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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