Pole Mount Distribution Transformer Design

S

slither

Guest
Hi everyone,

I'm currently trying to design a 20kVA (11kV - 230V) pole moun
distribution transformer for a project. I'm having some difficultie
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in th
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round o
square) of my winding materials (primary and secondary) should be? Finally
how much insulation should be placed between the winding layers?

Overall, i'm not really sure how to match my transformers application wit
suitable materials.



Any help would be very much appreciated. Or references to catalogues woul
be useful.


Thanks in advance
slither



---------------------------------------
Posted through http://www.Electronics-Related.com
 
On Mon, 17 May 2010 07:07:30 -0500, "slither"
<zxc981@n_o_s_p_a_m.hotmail.com> wrote:

Hi everyone,

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project. I'm having some difficulties
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in the
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round or
square) of my winding materials (primary and secondary) should be? Finally,
how much insulation should be placed between the winding layers?

Overall, i'm not really sure how to match my transformers application with
suitable materials.



Any help would be very much appreciated. Or references to catalogues would
be useful.
Click to expand...
---
http://www.youtube.com/watch?v=fzbQjd_Oo4Q
 
On May 17, 8:07 am, "slither" <zxc981@n_o_s_p_a_m.hotmail.com> wrote:
Hi everyone,

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project. I'm having some difficulties
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in the
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round or
square) of my winding materials (primary and secondary) should be? Finally,
how much insulation should be placed between the winding layers?

Overall, i'm not really sure how to match my transformers application with
suitable materials.

Any help would be very much appreciated. Or references to catalogues would
be useful.

Thanks in advance
slither

---------------------------------------        
Posted throughhttp://www.Electronics-Related.com
Click to expand...
It sounds like something I'd try and buy from someone who knew what
they were doing. Why do you need to make it yourself?

George H.
 
slither wrote:
Hi everyone,

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project. I'm having some difficulties
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in the
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round or
square) of my winding materials (primary and secondary) should be? Finally,
how much insulation should be placed between the winding layers?

Overall, i'm not really sure how to match my transformers application with
suitable materials.

Any help would be very much appreciated. Or references to catalogues would
be useful.
Click to expand...
Please tell me that this is a student project, and your design will
never hang on the pole outside my house!

And folks wonder why we need licensed engineers.

Start with a good Electric Machines text, like "Electric Machines:
Steady-State Theory and Dynamic Performance", M. S. Sarma, (C) William C
Brown, 1986. It goes into the trade-offs between iron, iron sizes,
wire, etc. Then get yourself a book that's _just_ about designing
heavy-iron transformers.

The get yourself about five to ten years of experience in industry,
helping to design these things, particularly in analyzing ones that have
come back to the factory after incidents. Once you've spent some
serious career time analyzing why the melt/burn/explode, then you'll be
ready to set out and design one.

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
 
"slither"
Hi everyone,

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project.
Click to expand...

** Wrong newsgroup - pal !!!!!!!!!!!!!!!!!!!!!

You need: "alt. suicidal.lunatics "




.... Phil
 
On 2010-05-17, slither <zxc981@n_o_s_p_a_m.hotmail.com> wrote:
Hi everyone,

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project. I'm having some difficulties
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in the
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round or
square) of my winding materials (primary and secondary) should be? Finally,
how much insulation should be placed between the winding layers?
Click to expand...
Sure sounds like a homework question.

Overall, i'm not really sure how to match my transformers application with
suitable materials.
Click to expand...
pick some figures and run the math see how much you loose in resistive
losses, eddy currents, and the like.

adjust the figures, repeat.


--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
 
On May 17, 5:07 am, "slither" <zxc981@n_o_s_p_a_m.hotmail.com> wrote:

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project. I'm having some difficulties
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in the
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round or
square) of my winding materials (primary and secondary) should be? Finally,
how much insulation should be placed between the winding layers?
Click to expand...
This is going to take some research into the economics. Your best
core design depends on the relative cost of lost energy and the
best specialty materials. You'll make a cost-amortization
calculation.

The design of pole pig transformers includes cooling oil and
enclosures, mechanical mount provisions, bird-tolerance, weather
resistance, transient overvoltage and overload tolerance, etc.

Looking up steel formulations for the magnetic properties will only
give
you an idealized (fully-annealed unstressed) sample's properties, NOT
the full as-manufactured performance of the finished product.

The stuff between windings is only PARTLY insulation; it's also
mechanical
stress relief.

Really designing one of these for mass-production is a daunting task.
Have fun!
 
whit3rd <whit3rd@gmail.com> wrote:
On May 17, 5:07?am, "slither" <zxc981@n_o_s_p_a_m.hotmail.com> wrote:

I'm currently trying to design a 20kVA (11kV - 230V) pole mount
distribution transformer for a project. I'm having some difficulties
deciding which core material and winding materials to use for the design.

How do i know what type of cold rolled grain oriented steel to use in the
core and what thickness the laminations should be?

How do i know what the thickness and type (Aluminium,copper, round or
square) of my winding materials (primary and secondary) should be? Finally,
how much insulation should be placed between the winding layers?
Click to expand...
If you check a catalog or actually open such a transformer up you'll find

aluminum primary, aluminum secondary would from flat straps, a step-lap
core and insulation made of transformer paper, probably epoxy cured and
then the tank filled with oil for cooling and insulation.

some places might still use copper, but it costs more so utilities don't
care for that.

distribution transformers are designed to be efficient and to not rip into
pieces if they experience a fault. the magnemotive forces can be quite
high in such large devices.
 
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