Date Code 20011026 Specifications 2-47
SEL-321/321-1 Instruction Manual
TECHNICAL SPECIFICATIONS (1 A NOMINAL RELAY)
General Element Ranges and Accuracy
Phase Mho
Distance
Secondary Reach Setting Range:
0.25 - 320 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*:
0.25 - 320 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):
0.25 - 320 Ω
0.25 - 250 Ω
±20° in 0.1° steps
Out-of-Step
Distance
Secondary Reactance Setting Range:
Secondary Resistance Setting Range:
±480 Ω
±350 Ω
Load
Encroachment
Detection
Secondary Impedance Setting Range:
Forward Load Angle Setting (in degrees):
Reverse Load Angle Setting (in degrees):
0.25 - 320 Ω
-90° to +90°
+90° to 270°
Distance Element
Accuracy
Secondary Steady-State Error:
±5% of set reach ±0.05 Ω at line angle (LA) for V > 5 V and I > 0.4 A
±10% of set reach ±0.05 Ω at LA for 1 V < V < 5 V and 0.2 A < I < 0.4 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
0.05 - 1 A
0.05 - 1 A
±320 Ω
±320 Ω
Supervisory
Overcurrent
Phase
Secondary Pickup Setting Range:
• Supervises ground distance
0.1 - 20 A, ±0.01 A, ±3% of setting
Phase-to-Phase Secondary Pickup Setting Range:
• Supervises phase distance
0.2 - 34 A, ±0.01 A, ±3% of setting
Positive- Sequence Secondary Pickup Setting Range:
• Supervises OOS logic
0.2 - 20 A, ±0.01 A, ±3% of setting
Residual Secondary Pickup Setting Range:
Transient Overreach:
• Supervises ground distance
0.1 - 20 A, ±0.01 A, ±3% of setting
±5% of pickup
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