Schweitzer Engineering Laboratories SEL-421-4 - Table 6.36 Automatically Calculated;Hidden Settings; Table 6.37 Relay Configuration (Group); Table 6.38 Out-Of-Step Tripping;Blocking

6.136
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
Out-of-Step Logic Application Examples
Example Completed
This completes the application example that describes setting the SEL-421 for
out-of-step tripping. Analyze your particular power system to determine the
appropriate settings for your application.
Relay Settings
Table 6.36 lists the settings that the relay automatically calculates and hides when
you set EADVS to N.
Table 6.37 and Table 6 .38 list the protective relay settings available in this example.
Table 6.36 Automatically Calculated/Hidden Settings
Setting Prompt Default Setting
X1B7 Zone 7 Reactance—Bottom (–0.05 to –140  secondary) X1B7 = –X1T7
X1B6 Zone 6 Reactance—Bottom (–0.05 to –140  secondary) X1B6 = –X1T6
R1L7 Zone 7 Resistance—Left (–0.05 to –140  secondary) R1L7 = –R1R7
R1L6 Zone 6 Resistance—Left (–0.05 to –140  secondary) R1L6 = –R1R6
50ABCP Positive-Sequence Current Supervision
(1.00–100 A secondary)
50ABCP = 0.2 • I
NOM
50QUBP Negative-Sequence Current Supervision
(OFF, 0.50–100 A secondary)
OFF
UBD Negative-Sequence Current Unblock Delay
(0.500–120 cycles)
0.500
UBOSBF Out-of-Step Angle Unblock Rate (1–10) 4
Table 6.37 Relay Configuration (Group)
Setting Prompt Entry
EOOS Out-of-Step Y
EADVS Advanced Settings (Y, N) N
Table 6.38 Out-of-Step Tripping/Blocking (Sheet 1 of 2)
Setting Prompt Entry
OOSB1 Block Zone 1 (Y, N) Y
OOSB2 Block Zone 2 (Y, N) Y
OOSB3 Block Zone 3 (Y, N) N
OSBD Out-of-Step Block Time Delay (0.500–8000 cycles) 1.500
OSBLTCH Latch Out-of-Step Blocking (Y, N) Y
EOOST Out-of-Step Tripping (N, I, O) O
OSTD Out-of-Step Trip Delay (0.500–8000 cycles) 0.875
X1T7 Zone 7 Reactance—Top (0.05 to 140  secondary) 96.00
X1T6 Zone 6 Reactance—Top (0.05 to 140  secondary) 95.00
R1R7 Zone 7 Resistance—Right (0.05 to 140  secondary) 15.53
R1R6 Zone 6 Resistance—Right (0.05 to 140  secondary) 5.87
X1B7 Zone 7 Reactance—Bottom (–0.05 to –140  secondary) –96.00
X1B6 Zone 6 Reactance—Bottom (–0.05 to –140  secondary) –95.00
R1L7 Zone 7 Resistance—Left (–0.05 to –140  secondary) –15.53