P.3.328
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Protection Application Examples
k0A1 := –6.579 Zone 1 ZSC Factor Angle (–179.99–180°)
Distance Element Common Time Delay
Zone 1 is set to trip with no intentional time delay. Zone 2 will trip after 20
cycles, thereby allowing remote protections to clear faults beyond the remote
terminal.
Z1D := 0 Zone 1 Time Delay (OFF, 0.000–16000 cycles)
Z2D := 20 Zone 1 Time Delay (OFF, 0.000–16000 cycles)
Out-of-Step Blocking
Out-of-step blocking is necessary to ensure that the distance elements do not
misoperate during a power swing. Refer to the OOS Application Example for
details on setting criteria.
We would have the following at both terminals:
OOSB1 := Y Block Zone 1 (Y, N)
OOSB2 := N Block Zone 2 (Y, N)
OOSB3 := N Block Zone 3 (Y, N)
OSBLTCH := Y Latch Out-of-Step Blocking (Y, N)
EOOST := N Out-of-Step Tripping (N, I, O)
50ABCP := 1.00 Positive-Sequence Current
Supervision(1.00–100 A secondary)
50QUBP := OFF Negative-Sequence Current Supervision
(OFF, 0.50–100 A secondary)
UBD := 0.500 Negative-Sequence Current Unblock Delay
(0.500–120 cycles)
UBOSBF := 4 Out-of-Step Angle Unblock Rate (1–10)
50Q1P := 1.0 Level Pickup (OFF, 0.25–0100 A sec.)
67Q1D := 0.5 Level 1 Time Delay (0.000–16000 cycles)
67Q1TC := 1 Level 1 Torque Control (SEL
OGIC control equation)
We would have the following at Relay S:
OSBD := 3.1 Out-of-Step Block Time Delay (0.500–8000 cycles)
X1T7 := 10.20 Zone 7 Reactance-Top (0.05–96 secondary)
X1T6 := 2.41 Zone 6 Reactance-Top (0.05–96 secondary)
R1R7 := 8.98 Zone 7 Resistance-Right (0.05–70 secondary)
R1R6 := 1.21 Zone 6 Resistance-Right (0.05–70 secondary)
We would have the following at Relay R:
OSBD := 3.3 Out-of-Step Block Time Delay (0.500–8000 cycles)
X1T7 := 12.73 Zone 7 Reactance-Top (0.05–96 secondary)
X1T6 := 3.01 Zone 6 Reactance-Top (0.05–96 secondary)
R1R7 := 11.23 Zone 7 Resistance-Right (0.05–70 secondary)
R1R6 := 1.51 Zone 6 Resistance-Right (0.05–70 secondary)
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