Schweitzer Engineering Laboratories SEL-421-4 - Table 5.55 Phase Overcurrent Element Settings; Table 5.56 Negative-Sequence Overcurrent Element Settings

5.94
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Instantaneous Line Overcurrent Elements
Each of the instantaneous directional elements includes a torque control setting
(67PnTC, 67QnTC, 67GnTC, where n = 1–4) to supervise the element operation.
The enable settings (E50P, E50Q, E50G) control how many of each type of
instantaneous/definite-time overcurrent elements are available. For example, if
E50P := 2, only 50P1, 67P1, 67P1T, 50P2, 67P2, and 67P2T are processed. The
remaining phase instantaneous/definite-time overcurrent elements (n = 3–4) are
defeated, and the output Relay Word bits are forced to logical 0.
Table 5.55 Phase Overcurrent Element Settings
Setting Prompt Range Default (5 A)
Phase Instantaneous Overcurrent Elements
E50P Phase Inst./Def.-Time O/C Elements N, 1–4 1
50P1P Level 1 Pickup (A) OFF, (0.05–20) • I
NOM
10.00
50P2P Level 2 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
50P3P Level 3 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
50P4P Level 4 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
Phase Definite-Time Overcurrent Elements
67P1D Level 1 Time Delay (cycles) 0.000–16000 0.000
67P2D Level 2 Time Delay (cycles) 0.000–16000 0.000
67P3D Level 3 Time Delay (cycles) 0.000–16000 0.000
67P4D Level 4 Time Delay (cycles) 0.000–16000 0.000
67P1TC Level 1 Torque Control SEL
OGIC Equation 1
67P2TC Level 2 Torque Control SEL
OGIC Equation 1
67P3TC Level 3 Torque Control SEL
OGIC Equation 1
67P4TC Level 4 Torque Control SEL
OGIC Equation 1
Table 5.56 Negative-Sequence Overcurrent Element Settings
Setting Prompt Range
Default
(5 A)
Negative-Sequence Instantaneous Overcurrent Elements
E50Q Neg.-Seq. Inst./Def.-Time O/C Elements N, 1–4 N
50Q1P Level 1 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
50Q2P Level 2 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
50Q3P Level 3 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
50Q4P Level 4 Pickup (A) OFF, (0.05–20) • I
NOM
OFF
Negative-Sequence Definite-Time Overcurrent Elements
67Q1D Level 1 Time Delay (cycles) 0.000–16000 0.000
67Q2D Level 2 Time Delay (cycles) 0.000–16000 0.000
67Q3D Level 3 Time Delay (cycles) 0.000–16000 0.000
67Q4D Level 4 Time Delay (cycles) 0.000–16000 0.000
67Q1TC Level 1 Torque Control SEL
OGIC Equation 1
67Q2TC Level 2 Torque Control SEL
OGIC Equation 1
67Q3TC Level 3 Torque Control SEL
OGIC Equation 1
67Q4TC Level 4 Torque Control SEL
OGIC Equation 1