Siemens 7UT51

4
Transformer Differential Protection (87T and 87HS)
7UT51 v3
64 PRIM-2330C
Table 4.3
Events Related to Differential Protection of a Transformer (87T and 87HS)
Configuration Errors
Configuration Error (7UT513 only): Both ground
-
current inputs
are set to monitor the same winding (addresses 7806 and
7807). (With default marshalling, any configuration error will light
LED 14.)
Err 2 CT star 5711 C S
Configuration Error (7UT513 only): The 87T/87HS function is
set to use a measured ground
-
current to correct the
corresponding winding’s zero sequence current, but neither
ground current input has been assigned that winding. (With
default marshalling, any configuration error will light LED 14.)
Err no CTstar 5712 C S
Configuration Events
If the transformer
-
description addresses are changed, the
current
-
matching factors for the phase currents are recalculated
and reported.
k CT 1=
factor
k CT 2= factor
k CT 3= factor
5713
5714
5715
C
C
C
If the transformer
-
description addresses are changed, the
current
-
matching factors for the ground currents being
measured are recalculated and reported.
ksCT 1=
factor
ksCT 2= factor
ksCT 3= factor
5716
5717
5718
C
C
C
Transformer Differential Protection (87T and/or 87HS)
Occurrence
LCD Abbreviation Event Oper Fault In/Out