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Distance Relay Setting Examples
GARD 8000 Distance Relay
RFL Electronics Inc.
Description Range
Units
Step
Actual
59-1
Enables trip by Phase Overvoltage, step 1.
Disable -
Enable
- 1
Disable
59-2
Enables trip by Phase Overvoltage, step 2.
Disable -
Enable - 1
Disable
59-3
Enables trip by Phase Overvoltage, step 3.
Disable -
Enable
- 1
Disable
27-1
Enables trip by Phase Undervoltage, step 1.
Disable -
Enable - 1
Disable
27-2
Enables trip by Phase Undervoltage, step 2.
Disable -
Enable
- 1
Disable
27-3
Enables trip by Phase Undervoltage, step 3.
Disable -
Enable - 1
Disable
59G-1
Enables trip by Ground Overvoltage, step 1.
Disable -
Enable
- 1
Disable
59G-2
Enables trip by Ground Overvoltage, step 2.
Disable -
Enable - 1
Disable
81 UNDFREQ1
Enables trip by Underfrequency, step 1.
Disable -
Enable
- 1
Disable
81 UNDFREQ2
Enables trip by Underfrequency, step 2.
Disable -
Enable - 1
Disable
81 UNDFREQ3
Enables trip by Underfrequency, step 3.
Disable -
Enable
- 1
Disable
81 OVERFREQ1
Enables trip by Overfrequency, step 1.
Disable -
Enable
- 1
Disable
81 OVERFREQ2
Enables trip by Overfrequency, step 2.
Disable -
Enable
- 1
Disable
81 OVERFREQ3
Enables trip by Overfrequency, step 3.
Disable -
Enable
- 1
Disable
81 FREQCHG1
Enables trip by Rate-of-change of Frequency, step 1.
Disable -
Enable - 1
Disable
81 FREQCHG2
Enables trip by Rate-of-change of Frequency, step 2.
Disable -
Enable
- 1
Disable
81 FREQCHG3
Enables trip by Rate-of-change of Frequency, step 3.
Disable -
Enable - 1
Disable
8.2.6
REACH SETTINGS
The following is an example of a basic Directional Comparison Scheme with Z1 set to 80% of line
impedance, Z2 set to 120%, Z3 not used and Z4 set to 50% in the reverse direction.
The pilot zone reaches (Z2 forward and Z4 reverse) need to be coordinated with the settings of the
remote relay, and take the line length into consideration.
Short lines may need a larger margin, i.e. Z2 = 150% and Zone 4 = 200%. The increased margin for
Zone 2 will ensure high speed pilot operation for all types of faults on the line. The increased margin
for Zone 4 will ensure high speed blocking of the remote end for faults behind the local terminal.
August 1, 2009
8-19
973.334.3100