Application - ABB RELION Series Technical Manual

1MRS758755 A
4.2.7.5
REC615 and RER615
Technical Manual
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)

Application

MFADPSDE provides selective directional earth-fault protection for high-impedance
earthed networks, that is, for compensated, unearthed and high resistance earthed
Section 4
Protection functions
391