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7SR242 Duobias Applications Guide Interposing CT Selection Guide Power Transformer Vector Group HV Interposing CT Selection LV Interposing CT Selection Yy0, YNy0, Yyn0, YNyn0, Ydy0, Yndy0, Ydyn0, Yndyn0, Dz0 Ydy0,0q Ydy0,0q Yd1, YNd1 Yd1,-30q Yy0,0q Yd1, YNd1 + Earthing Transformer Yd1,-30q Ydy0,0q Yy2, YNy2, Yyn2 YNyn2, Ydy2, YNdy2, Ydyn2, Yndyn2, Dz2 Ydy2,-60q Ydy0,0q Yd3, YNd3 Yd3,-90q Yy0,0q Yd3, YNd3 + Earthing Transformer Yd3,-90q Ydy0,0q Yy4, YNy4, Yyn4, YNyn4, Ydy4, YNdy4, Ydyn4, Yndyn4, Dz4 Ydy4,-120q Ydy0,0q Yd5, YNd5 Yd5,-150q Yy0,0q Yd5, YNd5 + Earthing Transformer Yd5,-150q Ydy0,0q Yy6, YNy6, Yyn6, YNyn6, Ydy6, YNdy6, Ydyn6, Yndyn6, Dz6 Ydy6,180q Ydy0,0q Yd7, YNd7 Yd7,150q Yy0,0q Yd7, YNd7 + Earthing Transformer Yd7,150q Ydy0,0q Yy8, YNy8, Yyn8, YNyn8, Ydy8, YNdy8, Ydyn8, Yndyn8, Dz8 Ydy8,120q Ydy0,0q Yd9, YNd9 Yd9,90q Yy0,0q Yd9, YNd9 + Earthing Transformer Yd9,90q Ydy0,0q Yy10, Yny10, Yyn10, YNyn10, Ydy10, YNdy10, Ydyn10, Yndyn10, Dz10 Ydy10,60q Ydy0,0q Yd11, Ynd11 Yd11,30q Yy0,0q Yd11, Ynd11 + Earthing Transformer Yd11,30q Ydy0,0q Dy1, Dyn1 Yy0,0q Yd11,30q Dy1, Dyn1 + Earthing Transformer Ydy0,0q Yd11,30q Dy3, Dyn3 Yy0,0q Yd9,90q Dy3, Dyn3 + Earthing Transformer Ydy0,0q Yd9,90q Dy5, Dyn5 Yy0,0q Yd7,150q Dy5, Dyn5 + Earthing Transformer Ydy0,0q Yd7,150q Dy7, Dyn7 Yy0,0q Yd5,-150q Dy7, Dyn7 + Earthing Transformer Ydy0,0q Yd5,-150q Dy9, Dyn9 Yy0,0q Yd3,-90q Dy9, Dyn9 + Earthing Transformer Ydy0,0q Yd3,-90q Dy11, Dyn11 Yy0,0q Yd1,-30q Dy11, Dyn11 + Earthing Transformer Ydy0,0q Yd1,-30q 1. Y or y denotes an unearthed star connection on the HV or LV side of the transformer. 2. YN or yn denotes an earthed star connection on the HV or LV side of the transformer. 3. D or d denotes a delta connection on the HV or LV side of the transformer respectively. 4. Z or z denotes a zigzag connection of the HV or LV side of the transformer respectively ©2010 Siemens Protection Devices Limited Chapter 7 Page 12 of 56
