ABB RELION 620 Series Technical Manual page 492

Hide thumbs Also See for RELION 620 Series:

Table of Contents

Protection functions

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

Activation of BLK_EF output (indication that fault is located opposite

to the set operate direction)

MFADPSDE provides selective directional earth-fault protection for high-impedance

earthed networks, that is, for compensated, unearthed and high resistance earthed

1MRS757644 F

Technical Manual

Show Quick Links

Table of Contents