How to calculate zero sequence impedance for transformers
How to calculate zero sequence impedance for transformers
(OP)
Hi.
Can anyone advise any litterature explaining how to make an analytical calculation of the zero sequence impedance for different couplings of 3 phase transformers, say Dyn, Zyn,Ynd,YYn.
Best Regards
hhhansen
Can anyone advise any litterature explaining how to make an analytical calculation of the zero sequence impedance for different couplings of 3 phase transformers, say Dyn, Zyn,Ynd,YYn.
Best Regards
hhhansen






RE: How to calculate zero sequence impedance for transformers
RE: How to calculate zero sequence impedance for transformers
RE: How to calculate zero sequence impedance for transformers
RE: How to calculate zero sequence impedance for transformers
Zero sequence impedance is discussed in the book Transformer engineering: design and practice by Kulkarni and Khaparde, for example. See
http://boo
RE: How to calculate zero sequence impedance for transformers
Analytically you can see what impact a particular winding connection will present. For example, if the source winding is delta, if you apply a single phase source to a delta and jumper all the phases together, you have effectively shorted out each delta winding so no current can pass through this winding to the secondary.
If the source winding is a wye or star, then you can apply a single phase source to this connection. By jumpering from phase to phase, you will energize each winding with the same source voltage and you will get current flow to the secondary.
You can look at the T&D Book, Wagner & Evans, Grainger & Stephenson or Charles Gross and others and find the equivalent circuit for a variety of two and three winding transformers. Once you reflect on doing the test with a single phase source, it should make more sense to you.