ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
Under carpet cable?
by HotLine1. 01/15/18 09:57 AM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 18 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
New model transformer #143026
04/24/05 02:40 PM
04/24/05 02:40 PM
P
pauluk  Offline OP
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
I've noticed several new pole-mount transformers in my area of a type rather different to those we've been used to seeing over the years, so it looks as though the PoCo has switched to this type for replacements.

Can anyone identify the make?


[Linked Image]

[Linked Image]

Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Re: New model transformer #143027
04/24/05 03:20 PM
04/24/05 03:20 PM
D
djk  Offline
Member
Joined: Dec 2002
Posts: 1,237
Ireland
Paul,

We've had xformers like that for quite a long time.

I'll see if i can get a picture of an old weather beaten one somewhere.

I think they're made by ABB.

...

They're used for remote small industrial 3-phase drops and also for providing power to small villages (bends in the road with a few houses, a pub, a police station and a post office)

Re: New model transformer #143028
04/24/05 11:49 PM
04/24/05 11:49 PM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
paul or dave

is the transformer connection like delta primary and wye secondary ???


merci , marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: New model transformer #143029
04/25/05 03:57 AM
04/25/05 03:57 AM
P
pauluk  Offline OP
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Marc,

Yes, it's 11kV delta primary, 240/415V wye secondary (or as this is a new xfmr, it may well be that the secondary is designed for the new nominal standard of 230/400V).

There is never a neutral on HV distribution lines in Britain, so all primaries are wired delta.

Re: New model transformer #143030
04/27/05 07:34 PM
04/27/05 07:34 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Paul,
Dave is in fact right about the brand of the transformer.
It is indeed an ABB Oil-filled 317 Series Distribution transformer.
We've actually got a few of these over here, used on Industrial sites.
Just a little note on the use of Star and Delta configurations in Distribution Systems, over here Star is used on the Primary winding in some places in the Network where the Transformer is required to be referenced to Earth.
The Earth is taken from the normal Star-point of the Transformer. [Linked Image]

Re: New model transformer #143031
04/28/05 11:32 AM
04/28/05 11:32 AM
T
Texas_Ranger  Offline
Member
Joined: Dec 2001
Posts: 2,407
Vienna, Austria
At school we were told 10 and 20kV distribution networks in Austria usually have a delta configuration, whereas systems with voltages exceeding 20kV (usually 110kV or 220kv) always have a star configuration. 230/400V supplies are usually star.

Re: New model transformer #143032
04/28/05 05:56 PM
04/28/05 05:56 PM
P
pauluk  Offline OP
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Presumably you mean that the originating windings on the higher voltages are wye (star) configuration but loads are still delta connected. If so, then I wonder if the lower-voltage lines are referenced to ground in any way.

The Cahier Technique paper on MV Distribution Systems has a table showing some of the grouding/neutral methods used, but doesn't include an entry for Austria.

Re: New model transformer #143033
04/29/05 02:31 AM
04/29/05 02:31 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Just an addendum to my original post.
It's interesting to see them spark gaps on the bushing insulators.
We don't use them here on our trannies for some wierd reason.
A very worth-while accessory in my opinion.
And there's more of that funny green wire. [Linked Image]
BTW Paul, what is that wire heading downward at an angle from under the base of the transformer?.
It looks like a stay wire, but it's point of attachment looks too "flimsy" for it to be one.

Re: New model transformer #143034
04/29/05 04:31 PM
04/29/05 04:31 PM
P
pauluk  Offline OP
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Yes, it's a fairly common stay arrangement. You can't actually see the point of attachment in the first photo.

The part of the bracket just visible to the left of the xfmr is a loop through which the wire passes. It's anchored higher up the pole.

Re: New model transformer #143035
04/30/05 10:42 AM
04/30/05 10:42 AM
C
chipmunk  Offline
Member
Joined: Jul 2004
Posts: 144
Southampton, UK
That arrangement is also fairly common in the States and Canada if I remember correctly. The general idea seems to be to allow the stay to be anchored into the ground closer than would otherwise be practical.

Page 1 of 2 1 2

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
BEAMEUP
BEAMEUP
WA
Posts: 27
Joined: December 2004
Show All Member Profiles 
Top Posters(30 Days)
sparky 23
Admin 20
Potseal 13
Popular Topics(Views)
243,527 Are you busy
180,327 Re: Forum
170,819 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 15 (0.004s) Memory: 1.0234 MB (Peak: 1.1986 MB) Zlib enabled. Server Time: 2018-01-17 20:00:31 UTC