Distance Relay Settings
GARD 8000 Distance Relay
RFL Electronics Inc.
July 21, 2009
7-1
973.334.3100
SECTION 7.
DISTANCE RELAY SETTINGS
7.1
GENERAL SETTINGS
Description Range
Units
Step
Default
Enable distance protection
Sets all distance protection module functions ON or OFF
No - Yes
-
1
On
RX Logic Bus Start Bit
Used by system logic. Factory set.
3-511
-
1
300
RX Logic Bus Length
Used by system logic. Factory set.
0-64
-
1
64
TX Logic Bus Start Bit
Used by system logic. Factory set.
3-511
-
1
364
TX Logic Bus Length
Used by system logic. Factory set.
0-64
-
1
64
Active Setting Group
Determines setting group in use by the distance protection
module
Group 1
Group 2
Group 3
Group 4
- 1 Group
4
Line CT ratio
Current transformer ratio for the protected line. For
example, a 2000/5 A CT has the ratio 400.
1 - 3000
-
1
1
Line PT Ratio
Voltage transformer ratio for the protected line. For
example, a 115,000/120 V PT has the ratio 1125.
1 - 10000
-
1
1
Bus PT Ratio
Voltage transformer ratio for a bus voltage used for the
synchro-check function. For example, a 115,000/120 V PT
has the ratio 1125.
1 - 10000
-
1
1
Polarization CT ratio
Current transformer ratio for a CT used for current ground
polarization.
1 - 3000
-
1
1
Parallel line CT Ratio
Current transformer ratio for the CT on a parallel line used
for mutual coupling compensation for the fault locator.
1 - 3000
-
1
1
Excessive Trips
Maximum number of breaker trips during a half hour
interval. Performed by the breaker monitoring function.
1 - 40
-
1
40
I² Sum Alarm
Alarm level for accumulated breaking current.
0 - 99999.99
kA²
0.01
0
I² Dropout Value
The dropout value is used to reset the counter following
breaker maintenance (then set to 0). It can also be set to a
value corresponding to estimated breaking current at the
time GARD 8000 is put into service, enabling a ‘start’ value
for the counter other than 0.
0 - 99999.99
kA²
0.01
0
Capacitive VT
Enable (Yes) or disable (No) the use of CCVT filter for the
distance relay.
No - Yes
-
1
No
