Siemens Reyrolle 7SR5 - Page 314

Interposing CT Selection Guide – Power Trans-
former Vector Group
W1 ICT Connection W2 ICT Connection
Yd3, YNd3 + Earthing Transformer Yd3,-90° Ydy0,0°
Yy4, YNy4, Yyn4, YNyn4, Ydy4, YNdy4, Ydyn4,
Yndyn4, Dz4
Ydy4,-120° Ydy0,0°
Yd5, YNd5 Yd5,-150° Yy0,0°
Yd5, YNd5 + Earthing Transformer Yd5,-150° Ydy0,0°
Yy6, YNy6, Yyn6, YNyn6, Ydy6, YNdy6, Ydyn6,
Yndyn6, Dz6
Ydy6,180° Ydy0,0°
Yd7, YNd7 Yd7,150° Yy0,0°
Yd7, YNd7 + Earthing Transformer Yd7,150° Ydy0,0°
Yy8, YNy8, Yyn8, YNyn8, Ydy8, YNdy8, Ydyn8,
Yndyn8, Dz8
Ydy8,120° Ydy0,0°
Yd9, YNd9 Yd9,90° Yy0,0°
Yd9, YNd9 + Earthing Transformer Yd9,90° Ydy0,0°
Yy10, Yny10, Yyn10, YNyn10, Ydy10, YNdy10,
Ydyn10, Yndyn10, Dz10
Ydy10,60° Ydy0,0°
Yd11, Ynd11 Yd11,30° Yy0,0°
Yd11, Ynd11 + Earthing Transformer Yd11,30° Ydy0,0°
Dy1, Dyn1 Yy0,0° Yd11,30°
Dy1, Dyn1 + Earthing Transformer Ydy0,0° Yd11,30°
Dy3, Dyn3 Yy0,0° Yd9,90°
Dy3, Dyn3 + Earthing Transformer Ydy0,0° Yd9,90°
Dy5, Dyn5 Yy0,0° Yd7,150°
Dy5, Dyn5 + Earthing Transformer Ydy0,0° Yd7,150°
Dy7, Dyn7 Yy0,0° Yd5,-150°
Dy7, Dyn7 + Earthing Transformer Ydy0,0° Yd5,-150°
Dy9, Dyn9 Yy0,0° Yd3,-90°
Dy9, Dyn9 + Earthing Transformer Ydy0,0° Yd3,-90°
Dy11, Dyn11 Yy0,0° Yd1,-30°
Dy11, Dyn11 + Earthing Transformer Ydy0,0° Yd1,-30°
(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.
Parameter: Gn 87T Common > Wn 87T Zone Inputs
•
Default setting: <all>
This specifies the CT winding inputs used by the differential protection.
Parameter: Gn 87T Common > Wn 87T-HB Select
•
Default setting: Operate
The differential current inrush blocking can be derived from the differential (operate) circuit (87T-HB2) or
measured directly from the line CT inputs (81HB2).
Protection and Automation Functions
5.22 87T Transformer Differential Protection
314 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019