Date Code 20011026 Specifications 2-49
SEL-321/321-1 Instruction Manual
TECHNICAL SPECIFICATIONS (5 A NOMINAL RELAY)
General Element Ranges and Accuracy
Phase Mho
Distance
Secondary Reach Setting Range:
0.05 - 64 Ω at the line angle
Ground
Mho Distance
Secondary Reach Setting Range:
│k
01
│ and │k
0
│ setting range*:
Angle k
01
and k
0
setting range*:
0.05 - 64 Ω at the line angle
0 - 4
±180° in 0.1° steps
* Note: Same setting applies to Quadrilateral Ground Distance.
Quadrilateral
Distance
Secondary Reactive Reach:
Secondary Resistive Reach:
Nonhomogeneous Factor (T, degrees):
0.05 - 64 Ω
0.05 - 50 Ω
±20° in 0.1° steps
Out-of-Step
Distance
Secondary Reactance Setting Range:
Secondary Resistance Setting Range:
±96 Ω
±70 Ω
Load
Encroachment
Detection
Secondary Impedance Setting Range:
Forward Load Angle Setting (in degrees):
Reverse Load Angle Setting (in degrees):
0.05 - 64 Ω
-90° to +90°
+90° to 270°
Distance Element
Accuracy
Secondary Steady-State Error:
±5% of set reach ±0.01 Ω at line angle (LA) for V > 5 V and I > 2 A
±10% of set reach ±0.01 Ω at LA for 1 V < V < 5 V and 1 A < I < 2 A
Transient Overreach Error:
±5% of set reach, plus steady-state error
Negative-Sequence
Directional
Element
Secondary Positive-Sequence Current Restraint Range:
Secondary Forward Directional Current Supervision:
Secondary Reverse Directional Current Supervision:
Secondary Forward Directional Impedance Setting:
Secondary Reverse Directional Impedance Setting:
0.02 - 0.5
0.25 - 5 A
0.25 - 5 A
±64 Ω
±64 Ω
Supervisory
Overcurrent
Phase
Secondary Pickup Setting Range:
• Supervises ground distance
0.5 - 100 A, ±0.05 A, ±3% of setting
Phase-to-Phase Secondary Pickup Setting Range:
• Supervises phase distance
1.0 - 170 A, ±0.05 A, ±3% of setting
Positive-Sequence Secondary Pickup Setting Range:
• Supervises OOS logic
1.0 - 100 A, ±0.05 A, ±3% of setting
Residual Secondary Pickup Setting Range:
Transient Overreach:
• Supervises ground distance
0.5 - 100 A, ±0.05 A, ±3% of setting
±5% of pickup
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