Author Topic: Transformer mods  (Read 3550 times)

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(unknown)

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Transformer mods
« on: March 10, 2007, 07:04:50 AM »
I have a 3 phase transformer whose secondary windings (neutral is far left wire) and nameplate are pictured below. I would like to rewire the secondary from wye to delta, but I'm confused by the fact there are only 2 coils. I was expecting 3 coils, one per phase. What's the deal?








« Last Edit: March 10, 2007, 07:04:50 AM by (unknown) »

(unknown)

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Re: Transformer mods
« Reply #1 on: March 10, 2007, 12:07:24 AM »
Sorry for the double post. I got a "Bad Response from Server" on my first try and assumed it didn't post.
« Last Edit: March 10, 2007, 12:07:24 AM by (unknown) »

Flux

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Re: Transformer mods
« Reply #2 on: March 10, 2007, 12:19:07 AM »
That's not a conventional 3 phase transformer. It seems to be Scott connected, normally used for 2 to 3 phase conversion. In this case if it is 3 phase only it must be the near equivalent of a star version of open delta.


You won't be able to mess about with it in the normal way.


Flux

« Last Edit: March 10, 2007, 12:19:07 AM by (unknown) »

(unknown)

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Re: Transformer mods
« Reply #3 on: March 10, 2007, 11:37:33 AM »
I generally agree with your observations, but I've never heard of a star version of an open delta before. An "open star" seems like a contradiction in terms.
« Last Edit: March 10, 2007, 11:37:33 AM by (unknown) »

Flux

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Re: Transformer mods
« Reply #4 on: March 10, 2007, 12:20:38 PM »
I was just drawing the analogy that it uses only 2 cores and the 3 phases are not transformed directly but are formed from the vectors.


I wasn't suggesting that you could convert from Scott to open delta, in fact there is not much you can do with it other than use it as it is.


Flux

« Last Edit: March 10, 2007, 12:20:38 PM by (unknown) »