Distance Relay Settings
GARD 8000 Distance Relay
RFL Electronics Inc.
7.4.5
MISC. CURRENT ELEMENTS
Description Range
Units
Step
Default
46 Open phase enable
Enables the Broken Conductor (open phase) function
No - Yes
-
1
No
46 Pickup
Pickup setting for broken conductor function. The Pickup level
is set as I
2
/I
1
, the ratio of negative sequence and
positive sequence current.
0.05 - 0.4
I2/I1
0.01
0.05
46 Time delay
Time delay for trip for broken conductor
0.05 - 300
s
0.01
0.05
46 Minimum load
Sets minimum load level for the broken conductor function.
If the positive sequence current is below this level, the broken
conductor function is blocked.
0.10 - 5
A
0.01
0.5
Forward Supervision 1-Ph
Minimum operating current for forward phase-
ground impedance zone operation
0.20 - 7.5
A
0.01
1
Forward Supervision 2-Ph
Minimum operating current for forward phase-
phase and three-phase impedance zone operation
0.20 - 7.5
A
0.01
1
Reverse Supervision 1-Ph
Minimum operating current for reverse phase-ground
impedance zone operation. When using Zone 4 reverse
looking for directional comparison blocking (DCB) pilot
schemes, the reverse sensitivity should be set higher (lower
setting of the current supervision element) than the forward
elements to ensure proper coordination.
0.20 - 7.5
A
0.01
1
Reverse Supervision 2-Ph
Minimum operating current for forward phase-phase and
three-phase impedance zone operation. When using Zone
4 reverse looking for directional comparison blocking (DCB)
pilot schemes, the reverse sensitivity should be set higher
(lower setting of the current supervision element) than the
forward elements to ensure proper coordination.
0.20 - 7.5
A
0.01
1
49 Thermal image enable
Enables the thermal image function
No - Yes
-
1
No
49 Heating constant
Heating constant for the line.
0.50 - 300
min
0.01
0.50
49 Cooling constant
Cooling constant for the line.
0.50 - 300
min
0.01
0.50
49 Maximum sustained current
Maximum allowed continuous load current on the line
1 - 12.5
A
0.5
5
49 Alarm Level
Thermal image alarm level
50 - 100
%
1
50
49 Thermal memory enable
If thermal memory is set to Yes, the function retains
the last calculated thermal level in memory and uses
this as start level when the GARD 8000 is put back
into service.
No - Yes
-
1
No
49 Reset threshold
Thermal image reset level in % of alarm level.
50 - 100
%
1
80
July 21, 2009
7-23
973.334.3100
