Transformer Zero Sequence Diagrams on Reference Handbook

[Tater]

Are the transformer zero sequence diagrams/equivalent circuits on Reference Handbook (page 68) specifically, the ungrounded Y - Delta correct?

The diagram should not have the ground drawn on the Y and equivalent circuit shown is not matching up with Figure 6.5 of Graffeo.

 

[speakeelsy PE]

Are the transformer zero sequence diagrams/equivalent circuits on Reference Handbook (page 68) specifically, the ungrounded Y - Delta correct?

The diagram should not have the ground drawn on the Y and equivalent circuit shown is not matching up with Figure 6.5 of Graffeo.

I agree, it shouldn't have the ground in that diagram. Might be because they're referencing the 1982 version of the book.

My Indian edition of Power Systems Analysis by Grainger and Stevenson printed in 2018, had a similar table and the connection diagram has no ground nor arrows in the ungrounded Y, I also checked my Electrical Machinery and Power System Fundamentals by Chapman book, it has an almost identical table with no ground, nor arrows on the ungrounded Y.

 

[Orchid PE]

Yeah, it's probably a copy-and-paste error.