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

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

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

(OP)

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=3...

http://files.engineering.com/getfile.aspx?folder=d...

Thanks

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

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.

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

(OP)
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 ?

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

(OP)
ReallY Thank You , I understand now ..


Thanks muchly.

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