Transformer Vector Group

Please explain why the details of this test cannot be found in the transformer manufacturer's erection and commissioning instructions for site personnel to follow.

sir

already the manufacturer already tested that transformer but he given only values of what ever he tested. for me my client wants to re test again and i want know about vector group

If you go through the forum threads for the last 30days or so you will find the answer.

Plese hire an authorised and licenced Electrical Engineer and he will carryout the above tests on your behalf.

more information refer tneb handbook for testing will guide u for all type of vector diagram or otherwise send u ur mail id i will send it.......

thank you sir. my mail id is [removed]

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I have sent you my ID but I didn't get your reply

I have authored & published a technical article on this topic of transformer vector group in Electrical India Magazine. Pl. send me your mail ID thro this forum's mailbox so that I can mail you the same.

Now, coming to your question, it need not be 1U & 2u (and NOT U1 & U2 as mentioned by you) which should be shorted always for vector group tetsing It can be any HV terminal to any LV Terminal shorting. Only thing is for the short made, you have to crate appropriate vector equations and verify them by testing.

The second part of your question: Again, it is not magnetic current balance test but only a magnetic balance test. This is done by keeping the Trf. LV Side open and then applying a low voltage to the HV Side. (Please never do the reverse). Then measure the voltages at the LV side. For a given winding arrangement, you can crate balance equations and verify the same from the measurements.

thank you sir. my mail id is [removed]

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Pl. send mail ID thro the forum's mailbox. Else, if you post it directly here, it would get deleted automatically as per the rules of the forum. I have already mailed the write-up to panban who had mailed me his ID.