ABB RELION REX640 Technical Manual page 675

1MRS759142 F
current includes high order harmonic components which can be detected and used
as the blocking criteria for the stabilized stage. The inrush detection information is
changed between two ends so that fast and safe blocking of the stabilized stage
can be issued on both ends.
BLKD2H_LOC
Figure 385: Blocking of line differential functions during detected transformer start-
up current
If the protection stage is allowed to start during the inrush situation, the time delay
can be selected so that the stabilized stage does not operate in the inrush situation.
4.3.1.8 Signals
LNPLDF Input signals
Table 647: LNPLDF Input signals
Name
I3P
BLOCK
Table continues on the next page
REX640
Technical Manual
ID> BLOCKED
RED 615
INRUSH
Type
SIGNAL
BOOLEAN
Protection functions
Default Description
- Three-phase currents
0=False Signal for blocking
the function
ID> BLOCKED
RED 615
675