1-18 Introduction and Specifications Date Code 20001006
SEL-351 Instruction Manual
Time-Overcurrent Elements
Pickup Range: 0.50 - 16.00 A, 0.01 A steps (5 A nominal)
0.10 - 3.20 A, 0.01 A steps (1 A nominal)
0.005 - 0.160 A, 0.001 A steps (0.05 A nominal
channel IN current input)
Steady-State Pickup Accuracy:
±0.05 A and ±3% of setting (5 A nominal)
±0.01 A and ±3% of setting (1 A nominal)
±1 mA and ±5% of setting (0.05 A nominal
channel IN current input)
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 Ranges: 0.00 - 150.00 V, 0.01 V steps (various elements)
{150 V voltage inputs}
0.00 - 300.00 V, 0.01 V steps (various elements)
{300V voltage inputs}
0.00 - 260.00 V, 0.01 V steps (phase-to-phase
elements) {150 V voltage inputs}
0.00 - 520.00 V, 0.01 V steps (phase-to-phase
elements) {300 V voltage inputs}
Steady-State Pickup Accuracy: ±1 V and ±5% of setting {150 V voltage inputs}
±2 V and ±5% of setting {300 V voltage inputs}
Transient Overreach: ±5% of pickup
Synchronism-Check Elements
Slip Frequency Pickup Range: 0.005 - 0.500 Hz, 0.001 Hz steps
Slip Frequency Pickup Accuracy: ±0.003 Hz
Phase Angle Range: 0 - 80°, 1° steps
Phase Angle Accuracy:
±4°
Courtesy of NationalSwitchgear.com
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