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.
INCOMING
INRUSH
ID> BLOCKEDID> BLOCKED
BLKD2H_LOC
RED 615RED 615
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
Type Default Description
I3P SIGNAL - Three-phase currents
BLOCK BOOLEAN 0=False Signal for blocking
the function
Table continues on the next page
1MRS759142 F Protection functions
REX640
Technical Manual
675
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