ABB REL 501-C1 2.5 Technical Reference Manual page 97

General fault criteria (GFC)
Table 97: Setting parameters for the underimpedance operating mode (I
5 for I = 5A)
r
Parameter Range
Operation Z< Off/On
ARGLd 5-45
Step: 1
RLd 0.10-400.00
Step: 0.01
X1RvPP 0.10-400.00
Step: 0.01
X1FwPP 0.10-400.00
Step: 0.01
RFPP 0.10-400.00
Step: 0.01
X1RvPE 0.1-400.00
Step: 0.01
X1FwPE 0.1-400.00
Step: 0.01
X0FwPE 0.1-1200.00
Step: 0.01
X0RvPE 0.1-1200.00
Step: 0.01
RFPE 0.1-400.00
Step: 0.01
Default Unit Description
Off - Operation of underimpedance based
GFC measurement enabled or disabled
25 degrees Load angle determining the load imped-
ance area
50 ohm/loop Limitation of resistive reach within the
load impedance area
50 ohm/phas Positive sequence reactive reach in
e reverse direction for phase-to-phase
faults
50 ohm/phas Positive sequence reactive reach in for-
e ward direction for phase-to-phase faults
50 ohm/loop Resistive reach (forward and reverse) for
phase-to-phase measurement
50 ohm/phas Positive sequence reactive reach in
e reverse direction for phase-to-earth faults
50 ohm/phas Positive sequence reactive reach in for-
e ward direction for phase-to-earth faults
50 ohm/phas Zero sequence reactance of reach in for-
e ward direction for phase-to-earth faults
50 ohm/phas Zero sequence reactance of reach in
e reverse direction for phase-to-earth faults
50 ohm/loop Resistive reach (forward and reverse) for
phase-to-earth measurement
Chapter 4
Line distance
= 1A, divide by
r
85