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function is blocked and the timers are reset. In the "Block TRIP output" mode, the function
operates normally but the
TRIP
output is not activated.
Timer
If the detected fault direction is opposite to the set directional mode and GFC release is
active,
BLK_EF
output is activated once
Pickup 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 pickup value
. BLK_EF is reset once the reset delay time
elapses. Activation of the
BLOCK
input deactivates the
BLK_EF
output and resets Timer.
GFC
release
Reset
timer
BLK_EF
Pickupt
delay
time
Pickup
delay
time
Reset
delay
time
Reset
delay
time
IG
VG
GUID-A2A55E4C-395C-43BB-A942-2991EA37E3A4 V1 EN
Figure 219:
Activation of BLK_EF output (indication that fault is located opposite to
the set operate direction)
Section 4
1MAC059074-MB A
Protection functions
456
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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