Date Code 20011026 Applications 5-29
SEL-321/321-1 Instruction Manual
SETTINGS SHEET Page 3 OF 10
FOR THE SEL-321/321-1 RELAY Date
(5 A
NOMINAL RELAY)
Out-of-Step Blocking and Tripping Settings
Enable OOS: (Y/N) EOOS = N
OOSB Enable: Block Zone 1: (Y/N) OOSB1 =
Block Zone 2: (Y/N) OOSB2 =
Block Zone 3: (Y/N) OOSB3 =
Block Zone 4: (Y/N) OOSB4 =
Out-of-Step Block Time Delay (TDPU): (0.5 - 8000 cycles) OSBD =
Enable OOST: (I/O/N) EOOST =
Out-of-Step TOWI Time Delay (TDPU): (0.5 - 8000 cycles) OSTD =
Zone 5 Reactive Reach: Top: (0 to ±96 Ω sec.) X1T5 =
Bottom: (0 to ±96 Ω sec.) X1B5 =
Zone 5 Resistive Reach: Right: (0 to ±70 Ω sec.) R1R5 =
Left: (0 to ±70 Ω sec.) R1L5 =
Zone 6 Reactive Reach: Top: (0 to ±96 Ω sec.) X1T6 =
Bottom: (0 to ±96 Ω sec.) X1B6 =
Zone 6 Resistive Reach: Right: (0 to ±70 Ω sec.) R1R6 =
Left: (0 to ±70 Ω sec.) R1L6 =
Zone 6 Positive-Sequence Overcurrent Supervision: (1 - 100 amps sec., I1) 50ABC =
Load-Encroachment Settings
Enable Load-Encroachment: (Y/N) ELE = Y
Load Impedance: Forward: (0.05 - 64 Ω sec.) ZLF = 9.22
Reverse: (0.05 - 64 Ω sec.) ZLR = 9.22
Load Angle: Positive Forward: (-90° to +90°) PLAF = 30
Negative Forward: (-90° to +90°) NLAF = -30
Positive Reverse: (+90° to +270°) PLAR = 150
Negative Reverse: (+90° to +270°) NLAR = 210
Negative-Sequence Directional Element Settings
Forward Directional Z2 Threshold: (±64 Ω sec.) Z2F = 0.77
Forward Directional Current Threshold: (0.25 - 5 amps sec., 3I2) 50QF = 0.50
Reverse Directional Z2 Threshold: (±64 Ω sec.) Z2R = 5.45
Reverse Directional Current Threshold: (0.25 - 5 amps sec., 3I2) 50QR = 0.50
Positive-Sequence Current Restraint Factor: (0.02 - 0.5 unitless) a2 = 0.07
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