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Timer
If the detected fault direction is opposite to the set directional mode and GFC release
is active,
BLK_EF
output is activated once
Start delay time
has elapsed. Reset timer
is activated at the falling edge of General Fault Criterion release, that is, when zero-
sequence voltage falls below
Voltage start value
. BLK_EF is reset once the reset delay
time elapses. Activation of the
BLOCK
input deactivates the
BLK_EF
output and
resets Timer.
GUID-7A52B88C-FBA7-435E-B967-0C7079EF92F6 V1 EN
Figure 204:
Activation of BLK_EF output (indication that fault is located opposite
to the set operate direction)
4.2.7.5
Application
MFADPSDE provides selective directional earth-fault protection for high-impedance
earthed networks, that is, for compensated, unearthed and high resistance earthed
1MRS758755 A
Section 4
Protection functions
REC615 and RER615
391
Technical Manual
Summary of Contents for RELION Series
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