1.12
SEL-311C Relay Instruction Manual Date Code 20060320
Introduction and Specifications
Specifications
Currents (0.50–1.25 A; 45–65 Hz)
(5 A nominal)
(0.10–0.25 A; 45–65 Hz)
(1 A nominal)
Magnitudes: ±4%
Angles: ±1.5° @ 25°C
±2.0° over the full temperature range
Currents (1.25–7.50 A; 45–65 Hz)
(5 A nominal)
(0.25–2.50 A; 45–65 Hz)
(1 A nominal)
Magnitudes: ±2%
Angles: ±1.0° @ 25°C
±1.5° over the full temperature range
Substation Battery Voltage Monitor Specifications
Pickup Range: 20–300 Vdc, 1 Vdc steps
Pickup Accuracy: ±2% ±2 V of setting
Timer Specifications
Reclosing Relay Pickup: 0.00–999,999.00 cycles,
0.25-cycle steps
Other Timers: 0.00–16,000.00 cycles, 0.25-cycle steps
Pickup/
Dropout Accuracy for
All Timers: ±0.25 cycle and ±0.1% of setting
Mho Phase Distance Elements
Zones 1–4 Impedance Reach
Setting Range: OFF, 0.05 to 64 Ω sec, 0.01 Ω steps
(5 A nominal)
OFF, 0.25 to 320 Ω sec, 0.01 Ω steps
(1 A nominal)
Minimum sensitivity is controlled by
the pickup of the supervising phase-
to-phase overcurrent elements for
each zone.
Accuracy: ±5% of setting at line angle
for 30 ≤ SIR ≤ 60
±3% of setting at line angle
for SIR < 30
Transient Overreach: < 5% of setting plus steady-state
accuracy
Zones 1–4 Phase-to-Phase Current Fault Detectors (FD)
Setting Range: 0.5–170.00 A
P-P
secondary,
0.01 A steps (5 A nominal)
0.1–34.00 A
P-P
secondary,
0.01 A steps (1 A nominal)
Accuracy: ±0.05 A and ±3% of setting
(5 A nominal)
±0.01 A and ±3% of setting
(1 A nominal)
Transient Overreach: < 5% of pickup
Maximum Operating
Time:
See pickup and reset time curves in
Figure 3.20 and Figure 3.21.
Mho and Quadrilateral Ground Distance Element
Zones 1–4 Impedance Reach
Mho Element Reach: OFF, 0.05 to 64 Ω sec, 0.01 Ω steps
(5 A nominal)
OFF, 0.25 to 320 Ω sec, 0.01 Ω steps
(1 A nominal)
Quadrilateral Reactance
Reach:
OFF, 0.05 to 64 Ω sec, 0.01 Ω steps
(5 A nominal)
OFF, 0.25 to 320 Ω sec, 0.01 Ω steps
(1 A nominal)
Quadrilateral Resistance
Reach:
OFF, 0.05 to 50 Ω sec, 0.01 Ω steps
(5 A nominal)
OFF, 0.25 to 250 Ω sec, 0.01 Ω steps
(1 A nominal)
Minimum sensitivity is controlled by
the pickup of the supervising phase
and residual overcurrent elements for
each zone.
Accuracy: ± 5% of setting at line angle
for 30 ≤ SIR ≤ 60
±3% of setting at line angle
for SIR < 30
Transient Overreach: <5% of setting plus steady-state
accuracy
Zones 1–4 Phase and Residual Current Fault Detectors (FD)
Setting Range: 0.5–100.00 A secondary, 0.01 A steps
(5 A nominal)
0.1–20.00 A secondary, 0.01 A steps
(1 A nominal)
Accuracy: ± 0.05 A and ±3% of setting
(5 A nominal)
±0.01 A and ±3% of setting
(1 A nominal)
Transient Overreach: <5% of pickup
Max. Operating Time: See pickup and reset time curves in
Figure 3.20 and Figure 3.21.
Instantaneous/Definite-Time Overcurrent Elements
Pickup Range: OFF, 0.25–100.00 A, 0.01 A steps
(5 A nominal)
OFF, 0.05–20.00 A, 0.01 A steps
(1 A nominal)
Steady-State Pickup
Accuracy:
±0.05 A and ±3% of setting
(5 A nominal)
±0.01 A and ±3% of setting
(1 A nominal)
Transient Overreach: <5% of pickup
Time Delay: 0.00–16,000.00 cycles, 0.25-cycle steps
Timer Accuracy: ±0.25 cycle and ±0.1% of setting
Maximum Operating
Time:
See pickup and reset time curves in
Figure 3.20 and Figure 3.21.
Time Overcurrent Elements
Pickup Range: OFF, 0.25–16.00 A, 0.01 A steps
(5 A nominal)
OFF, 0.05–3.20 A, 0.01 A steps
(1 A nominal)
Steady-State Pickup
Accuracy:
±0.05 A and ±3% of setting
(5 A nominal)
±0.01 A and ±3% of setting
(1 A nominal)
Time Dial Range: 0.50–15.00, 0.01 steps (US)
0.05–1.00, 0.01 steps (IEC)
Curve Timing Accuracy: ±1.50 cycles and ±4% of curve time for
current between 2 and 30 multiples of
pickup
Under- and Overvoltage Elements
Pickup Range: OFF, 0.00–150.00 V, 0.01 V steps
(various elements)
OFF, 0.00–260.00 V, 0.01 V steps
(phase-to-phase elements)
Steady-State Pickup
Accuracy:
±1 V and ±5% of setting
Transient Overreach: <5% of pickup
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