Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Distribution Transformers

Status
Not open for further replies.

RODALCO

Well-Known Member
As said in the other thread, distribution transformer explosions, i think it is a good idea to keep this topic distribution transformers under a different thread where we also can discuss different power systems as well for people who are interested.

As i promised i would attach some overhead TX's and here they are.
These photo's were taken today.
One taken in Whangaparoa, 50 kVA, (middle 2)
Also a shot of the ddo's ( dominion drop out fuses )
other in New Lynn, Tomo st. 200 kVA with vent pipe ( left )
last one in Titirangi, Mc Eldownie rd, 100 kVA. ( right )

Normal system used in New Zealand is 11 or 22 kV for distribution and 230 / 400 Volts for supply at 50 Herz.
 

Attachments

  • DSC00538a.JPG
    DSC00538a.JPG
    73.8 KB · Views: 289
  • DSC00534a.JPG
    DSC00534a.JPG
    50.9 KB · Views: 266
  • DSC00535a.JPG
    DSC00535a.JPG
    49.4 KB · Views: 249
  • DSC00540a.JPG
    DSC00540a.JPG
    138.8 KB · Views: 249
that last one looks really old! thanks for the pics!
 
Here are two photo's from a new ground mounted transformer on a pad and adjacent to it is a 11 kV ring mains unit ( andelect )
Photo's taken at Whangaparoa road.
This is a 100 kVA TX, supplying power to a couple of houses and streetlighting in the area.
The relays in the grey box are for hotwater and streetlight control.

Any one around the world with interesting transformer set ups, could make a great addition to this interesting topic.
As electronics enthousiasts we rely on electricity, and it is important to know what supplies our workshops.

Looking forward to a discussion or photo's
Raymond
 

Attachments

  • DSC00532a.JPG
    DSC00532a.JPG
    123.7 KB · Views: 692
  • DSC00533a.JPG
    DSC00533a.JPG
    125.1 KB · Views: 238
Very good pics! I find H.V distribution/transformers always an interesting topic. The vent pipe is a little scary-wouldn't want to be standing underneath it if things hotted up!
Cheers,

Grant
 
Transformer cores

Attached are some digital photo's i took from old 35 mm photo's i took when i worked at the WEPB in Henderson, West Auckland, New Zealand.

We converted pole type transformers into ground mounted distribution TX's which involved rewiring the off load tapchanger and LV cables to the bushings.

100 kVA WEPB with copper windings.

500 kVA ECC with copper windings.

200 kVA Tyree with aluminium primary and Al flat strip winding as secundairy.
 

Attachments

  • DSC03046.JPG
    DSC03046.JPG
    140 KB · Views: 418
  • DSC03047.JPG
    DSC03047.JPG
    146.5 KB · Views: 247
  • DSC03049.JPG
    DSC03049.JPG
    138.7 KB · Views: 259
Cooked

This photo is from a "cooked" TX.
It is from another Tyree 200 kVA TX which has been heavily overloaded in an industrial area.
The TX survived but customers were complaining about low voltage.

TX details:
200 kVA
11 kV - 230/400 Volts
I continuous at primairy 11 Ampères per phase.
I continuous at secundairy 278 Ampères per phase.

This TX was replaced with a 500 kVA TX and the daily 8 hour load was 650 Ampères per phase.
That one takes 596 Ampères per phase.
That is well over twice the continuous current the TX is designed for.

The oil is black tar cooked oil.
Normally the oil turns yellowish/brown after years of service but not black.

New insulating and cooling oil is clear with a bluish tinge.
 

Attachments

  • DSC03050.JPG
    DSC03050.JPG
    124.2 KB · Views: 209
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top