Siemens 7UT51 Instruction Manual page 64

4
Transformer Differential Protection (87T and 87HS)
Transformer Differential Protection (87T and/or 87HS)
Occurrence
Configuration Errors
Configuration Error (7UT513 only): Both ground
are set to monitor the same winding (addresses 7806 and
7807). (With default marshalling, any configuration error will light
LED 14.)
Configuration Error (7UT513 only): The 87T/87HS function is
set to use a measured ground
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.)
Configuration Events
-
If the transformer description addresses are changed, the
-
current matching factors for the phase currents are recalculated
and reported.
-
If the transformer description addresses are changed, the
-
current matching factors for the ground currents being
measured are recalculated and reported.
Table 4.3 Events Related to Differential Protection of a Transformer (87T and 87HS)
64
-
current inputs
-
current to correct the
LCD Abbreviation Event
Err 2 CT star 5711
Err no CTstar 5712
k CT 1= factor 5713
k CT 2= factor 5714
k CT 3= factor 5715
ksCT 1= factor 5716
ksCT 2= factor 5717
ksCT 3= factor 5718
7UT51 v3
Oper Fault In/Out
C S
C S
C
C
C
C
C
C
PRIM-2330C