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sanjayjssate
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What is Meaning of Dy11y11 Vector Group Transformer?

01/15/2015 3:00 AM

Dear All,

We have transformer of 2MVA which have specification as Dy11y11 vector group. what does it means?

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nikolay
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#1

Re: What is Meaning of Dy11y11 Vector Group Transformer?

01/15/2015 4:37 AM

Are you an electrician or just want to learn about transformers?

Dy11y11 says that you have a transformer with two secondary windings. First (high voltage) winding is delta connection, second and third (low voltage) are star (of Y) connected. 11 means that there is an angle of 330 degree (11x30) between the primary and secondary voltage vectors. no neutral accessible.

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adreasler
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#5
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Re: What is Meaning of Dy11y11 Vector Group Transformer?

01/16/2015 9:30 AM

Good answer, but you left part of it untranslated.

2MVA Means two mega-volt-amps. This needs a little explanation:

First off, transformers are not rated in Watts, since that is a measure of power consumption, generation or dissipation, and a transformer dissipates very little of the power put through it as noise or heat, so transformers use the Volt-Amp to measure maximum power. There are subtle differences between the VA and the Watt, but for this discussion we can consider them roughly interchangeable for the point I'm making.

Secondly, the prefix Mega indicates 10^6, or 1,000,000.

So this transformer is capable of shuffling two million watts of power through it. If you are not a licensed electrician or Electrical Engineer with specific high-voltage and arc-flash training, all that translates into three words: DO. NOT. TOUCH! If you are near that transformer when something goes wrong, there won't be enough of you left to put in an ashtray.

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wareagle
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#2

Re: What is Meaning of Dy11y11 Vector Group Transformer?

01/15/2015 5:19 PM

http://electrical-engineering-portal.com/understanding-vector-group-transformer-1
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HiTekRedNek
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#3

Re: What is Meaning of Dy11y11 Vector Group Transformer?

01/15/2015 11:25 PM

Here is a link that explains transformer designations very well.

http://electrical-engineering-portal.com/understanding-vector-group-transformer-1

A simple Google Search found it quickly.

Is there a lesson here?

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#4

Re: What is Meaning of Dy11y11 Vector Group Transformer?

01/15/2015 11:55 PM

Is there an echo in the room?

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