Zero sequence network of Wye grounded-Wye ungrounded

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wbuaklee

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I read text books concerning zero sequence network of transformer which having different winding connections but I confuse in some configurations because those books are conflict.
From attached file,compare configuration 2 with f and 5 with g,
Could you please me guide me which one should be used?

Attached file download link:
http://www.zidoupload.com/f-VuyUs6PM
 
OOOk, Eventhough I do not know Hindi but I downloaded your file like a blind.

It is good to attach your fine instead of given link

I read it, Now

Comparing configuration 2 with f has no problem and they are the same. Just in f part two has a connection H with Zt and in part three it is by mistake a little space shown but note it is not open. they are connected.


Comparing configuration 5 and g there is a little bit difference. configuration g is absolutely correct and configuration 5 has a problem in 5 in part 3 the P point should not be connected to Zt.


I have attached your file for others to check and express their idea
 
I see things opposite from Hamedullah. If you put circuit f in a series sequence network to calculate 1? fault on the grounded wye primary of the transformer, the connection from H to No will short out the system zero-sequence impedance. I don't think this is correct. There should be no connection, 2 is correct.

I think 5 and g are functionally the same because if you use the circuit in a network, any connection would be to either H or L, and neither has a connection to No.

See http://www.geindustrial.com/publibrary/checkout/38652.30055.7762.44019/generic/GET-3388B.pdf for a discussion of wye connected windings.
 
jghrist said:
I see things opposite from Hamedullah. If you put circuit f in a series sequence network to calculate 1? fault on the grounded wye primary of the transformer, the connection from H to No will short out the system zero-sequence impedance. I don't think this is correct. There should be no connection, 2 is correct.

I think 5 and g are functionally the same because if you use the circuit in a network, any connection would be to either H or L, and neither has a connection to No.
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I agree. The diagrams are correct as shown and are functionally the same. f has a gap and the connection in 5 stays.
 
So, I know that their functionality is the same when combining into sequence network for fault analysis.But I'd like to know the concept behind them why their drawing is different.
 
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