Date Code 20011112
Line Current Differential, Distance, Out-of-Step, Overcurrent,
3-25
Voltage, Synchronism Check, and Frequency Elements
SEL-311L Instruction Manual
Tapped-Load Residual Ground Inst. Overcurrent Element Settings
Pickup:
T50GP
OFF, 0.5–100.0 A, sec. (5 A nominal)
OFF, 0.1–20.0 A, sec. (1 A nominal)
Steady-State Pickup Accuracy:
±0.05 A and ±4% of setting (5 A nominal)
±0.01 A and ±4% of setting (1 A nominal)
Transient Overreach:
<5% of pickup
Time Delay:
T50GD
0.0–16000 cycles
Timer Accuracy:
±0.25 cycle and ±0.1% of setting
Tapped-Load Negative-Sequence Time-Overcurrent Element Settings
Pickup:
T51QP
OFF, 0.50–16 A, sec. (5 A nominal)
OFF, 0.1–3.2 A, sec. (1 A nominal)
Steady-State Pickup Accuracy:
±0.05 A and ±4% of setting (5 A nominal)
±0.01 A and ±4% of setting (1 A nominal)
Curve:
T51QC
U1–U5, C1–C5
Time Dial:
T51QTD
0.50–15.00
1
EM Reset Delay:
T51QRS
Y, N
Curve Timing Accuracy:
±1.50 cycles and ±5% of curve time for
current between 2 and 30 multiples of
pickup
1
If 51QC is a C curve, this range is 0.05–1.0.
Tapped-Load Negative-Sequence Inst. Overcurrent Element Settings
Pickup:
T50QP
OFF, 0.5–100.0 A, sec. (5 A nominal)
OFF, 0.1–20.0 A, sec. (1 A nominal)
Steady-State Pickup Accuracy:
±0.05 A and ±4% of setting (5 A nominal)
±0.01 A and ±4% of setting (1 A nominal)
Transient Overreach:
<5% of pickup
Time Delay:
T50QD
0.0–16000 cycles
Timer Accuracy:
±0.25 cycle and ±0.1% of setting
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