Power Transformer Vector Group Test

Can you send me a mail thro this forum's mailbox - intimating your mail IDZ so that I can send you a complete write up on Vector Groups & its testing? I am unable to load diagrams in thie forum.

Hi, Suvo Nababarsha 1417. I've a practical way to check the vector group of a transformer. Consider Primary side phases as R, Y and B and corresponding secondary phases are r, y and b.

1. Short R-r by a copper wire.

2. Now apply 415 V(increase the voltage gradually to limit the current) in between R-Y-B.

3. Now measure voltage as below-

For DY11- V_By= V_Bb and V_Yy<V_Yb

For DY1- V_Yy= V_{Yb and} V_Bb<V_By

Y-Y or D-D grouping can be detected easily.

ealish macher dam kato ekhon?

Shuvo nobobarso.Thank you for your answer and cooperation.Can we do this by shorting any other terminals.In that case what will be the condition for being Dyn11 &

Dyn1.

apni elish mach pachondo koren.elish mach er dam per kg tay Tk. 500-600 hobey dhakai.

I've given you the example by considering R phase as reference. You can do it by considering any other phase as reference and then you have to measure voltages as I mentioned earlier, but the suffix and prefix of the equations will be different.

As Samad vai told, never apply the voltage in LV winding.

Amader ekhane elish Rs400 taka per Kg.

Thanks for your reply.

Could you please explain this with diagram if we short R-c for Dyn1

hi i am ali khani from iran

please explane me how to test victor group trans test in ynd11 and ynd1 and ynd5 and dyn1

thanks

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Dear Sidhu

pl. re-check the conditions with vector representation.

I believe the conditions for DY1 and DY11 are interchanged.

For DY1, VBb=VBy and VYy < VYb

For Dy11, VYy=VYb and VBb<VYb.

Biren

For Dyn11

V(Bb)<V(BY) &

V(bY)=V(yY)

You can download image files...

Just supporting Sidhu16:

See this link. It has many testing for transformer, including the vector group (Dy11 and Dy1) testing that Sidhu16 mentioned.

http://electricalandelectronics.org/2008/09/21/power-transformers/ (section 2.4.9: Phasor Group Testing)

Caution: Never apply voltage to the low voltage side.

Shidhu: Apni Bangla Janen?

- MS

Thanks for your nice answer.

Insallah! are Samad vai, apni to Bangali. Ami o Bangali.

When I get praise from you and you support any of my comment then it work as boost up for me.

Thanx a lot.

Sidhu

dear electrical expert can u tell me how to perform the vector group test ,,,i mean how u can get the conditions for different vector groups...i.e dyn11 or dyn1 ...

my mail id is shailesh0508@hotmail.com