T60 Overall(Block Diff) Protection Relay , Angle Winding Respect to ? 1

[rayas91]

Hi frineds ,

I m starter for testing T60 relay.And I m not sure about setting of winding angles.I couldnt understand how to set.

I drawed it , can you explain that what angles should be set and why ?

Files are on attchment.

http://files.engineering.com/getfile.aspx?folder=3f1a90a4-719d-49fd-9892-bb6e9c644b97&file=t60.PNG

http://files.engineering.com/getfil...-5c46-41b9-ae54-c74502aa16b7&file=drawing.png

Thanks

 

[stevenal]

YnD11 means the secondary delta leads the primary wye by 30 degrees (11:00 on the clock face when the primary is at 12:00). Since you are using the delta winding as the reference, the wye winding lags by 30. Suggest using -30 for winding 2. This assumes your bushings are conventionally connected and the CTs are wye connected.

 

[rayas91]

thanks stevenal, But I mean that I cant understand how ct polarity affects angles.

Can you give a clear example with CTs,like my drawing ?

 

[stevenal]

http://files.engineering.com/downlo...d39d-414a-b983-285d04819735&file=3phXfmrs.pdf

 

[rayas91]

ReallY Thank You , I understand now ..


Thanks muchly.