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yk
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Join Date: Jun 2011
Location: india/gujrat/Bhuj/atps
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Vector Group of Generating Transformer(G.T.)

10/01/2011 9:38 AM

Hello sirs, my question is that,is there any standard there to select vector group of generating transformer(g.t.)?.i mean we can use Dyn1 instead of Dyn11.

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msamad
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#1

Re: Vector Group of Generating Transformer(G.T.)

10/01/2011 4:39 PM

The answer is 'No' as far as I know.

- MS

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yk
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Location: india/gujrat/Bhuj/atps
Posts: 30
#3
In reply to #1

Re: Vector Group of Generating Transformer(G.T.)

10/02/2011 2:05 PM

thanking u sir . Can u tell me why?.or from where can i get detail abt. that.

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electricalexpert65
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#6
In reply to #3

Re: Vector Group of Generating Transformer(G.T.)

10/03/2011 7:39 AM

Dyn11 means the HV side or the yard side is Delta connected and the LV side or the Generator side is Star connected and the star side neutral is brought out. The LV voltage will be leading the HV voltage by 30 degrees. Whuch means that the HV voltage will "lag" the LV voltage by 30 degrees. This is alright because most of the users would have a step down power transformers at their installation which would be of vector group Dyn 11 (i.e.) HV side or the line side in Delta and the LV side or the load side in Star and the star side neutral brought out. The LV side Voltage would lead the HV Voltage by 30 degrees. This is logical too, as at the generating station a 30 degree lag is created (transmission voltage with respect to the generation voltage) and at the user end 30 degree lead is created; thus, the user voltage is "in phase" with the generator voltage.

If you use Dyn1 at the generating station, then as all the user trafos are Dyn11 too, the net phase shift would be 60 degrees (user end voltage with respect to the generated voltage). So, please don't chnage the vector group at the generating station.
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yk
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Location: india/gujrat/Bhuj/atps
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#7
In reply to #6

Re: Vector Group of Generating Transformer(G.T.)

10/13/2011 3:16 PM

thanking u sir.

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soebfatehi
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#2

Re: Vector Group of Generating Transformer(G.T.)

10/01/2011 10:59 PM

start your journey through . . . . -




http://www.control.com/1026211688/index_html
-
http://cr4.globalspec.com/thread/4934/Types-of-Vector-Groups-for-Transformers
-
http://cr4.globalspec.com/thread/13790
-
http://cr4.globalspec.com/thread/6949
-
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yk
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Location: india/gujrat/Bhuj/atps
Posts: 30
#4
In reply to #2

Re: Vector Group of Generating Transformer(G.T.)

10/02/2011 2:07 PM

thanking u sir.

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electricalexpert65
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#5

Re: Vector Group of Generating Transformer(G.T.)

10/03/2011 7:39 AM

Dyn11 means the HV side or the yard side is Delta connected and the LV side or the Generator side is Star connected and the star side neutral is brought out. The LV voltage will be leading the HV voltage by 30 degrees. Whuch means that the HV voltage will "lag" the LV voltage by 30 degrees. This is alright because most of the users would have a step down power transformers at their installation which would be of vector group Dyn 11 (i.e.) HV side or the line side in Delta and the LV side or the load side in Star and the star side neutral brought out. The LV side Voltage would lead the HV Voltage by 30 degrees. This is logical too, as at the generating station a 30 degree lag is created (transmission voltage with respect to the generation voltage) and at the user end 30 degree lead is created; thus, the user voltage is "in phase" with the generator voltage.

If you use Dyn1 at the generating station, then as all the user trafos are Dyn11 too, the net phase shift would be 60 degrees (user end voltage with respect to the generated voltage). So, please don't chnage the vector group at the generating station.
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