2-48 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
Directional
Time-Overcurrent
Selectable Curve Shape: Moderately inverse (US) or Longtime Standby (IEC)
Inverse (US) or Standard Inverse (IEC)
Very Inverse (US or IEC)
Extremely Inverse (US or IEC)
Phase Pickup setting range: 0.1 A - 3.4 A, ±0.05 A, ±3% of setting
Neg.-Seq. Pickup setting range: 0.1 A - 3.2 A, ±0.05 A, ±3% of setting
Residual Pickup setting range: 0.1 A - 3.2 A, ±0.05 A, ±3% of setting
Time Dial setting range: 0.5 - 15 in 0.01 steps (US)
0.05 - 1 in 0.01 steps (IEC)
Timing: ±4% and ±1.5 cycles for current magnitudes between 2 and 20 multiples of
pickup.
Nondirectional
Residual/Neg.-Seq.
Overcurrent
Secondary Pickup setting range: 0.05 - 16 A, ±0.01 A, ±3% of setting
Transient Overreach: ±5% of pickup
Overvoltage
Pickup: 0 - 150 V, ±5% of setting, ±1 V
Transient Overreach: ±5% of pickup
Undervoltage
Pickup: 0 - 100 V, ±5% of setting, ±1 V
Transient Overreach: ±5% of pickup
Miscellaneous
Timers
Step Distance
Time Delay: 0 - 2000 cycles
Communications Scheme
Time Delay: 0 - 2000 cycles
DCB Carrier Coordination
Time Delay: 0 - 60 cycles
Short Delay
Time Delay: 0 - 2000 cycles
Long Delay
Time Delay: 0 - 8000 cycles
Loss-of-Potential Set
Time Delay: 1 - 60 cycles
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