Transformer zero sequence reactance

[djsw]

Hello,

How to calculate transformer zero sequence impedance (Ohms per phase) for YNzn and ZNzn vector group?

 

[wareagle]

check here

http://www.eng-tips.com/viewthread.cfm?qid=265772&page=1

 

[djsw]

It not help me a lot. So, I need to make calculation of the zero sequence impedance (Ohms per phase) for a few different 3-phase distribution transformer designs: YNzn, ZNyn and ZNzn vector group.

 

[jghrist]

It not help me a lot.

That's because what you are asking has no easy answer. The references sited in the other thread go into the details which are too complicated to go into in a forum such as this and give you a reasonable answer to your very general question. If you have a specific problem with a particular calculation, you might get some help here.

 

[mivey]

Does this help you?:

http://www.basler.com/downloads/ZeroSequenceCircuit.pdf