Schweitzer Engineering Laboratories SEL-351A - Figure 3.3 Levels 1 through 4 Phase Instantaneous;Definite-Time Overcurrent Elements (with Directional Control Option) (Not in SEL-351 A-1)

3.4
SEL-351A Relay Instruction Manual Date Code 20080213
Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Instantaneous/Definite-Time Overcurrent Elements
q From Figure 3.1; w from Figure 4.24.
Figure 3.3 Levels 1 Through 4 Phase Instantaneous/Definite-Time
Overcurrent Elements (With Directional Control Option) (Not in SEL-351A-1)
Directional Control Option (Not in SEL-351A-1)
The phase instantaneous overcurrent element Relay Word bit outputs in
Figure 3.1 (50P1, 50P2, 50P3, and 50P4) are inputs into the phase
instantaneous/definite-time overcurrent element logic in Figure 3.3.
Enabled
Levels
67P1
67P1T
q
50P1
67P1TC
SELOGIC
Setting
67P1D
0
Directional Control
(asserted to logical 1
continuously if E32 = N)
SEL
OGIC
Torque Control
w
(Level 1)
Level 1
(Setting
E5OP
≥
1)
Directional Control
(asserted to logical 1
continuously if E32 = N)
SELOGIC
Torque Control
67P3
67P3T
q
50P3
Relay
Word
Bit
67P3TC
SELOGIC
Setting
67P3D
0
w
(Level 3)
Level 3
(Setting
E5OP ≥ 3)
Directional Control
(asserted to logical 1
continuously if E32 = N)
SELOGIC
Torque Control
67P4
67P4T
q 50P4
Relay
Word
Bit
67P4TC
SELOGIC
Setting
67P4D
0
w
(Level 4)
Level 4
(Setting
E5OP ≥ 4)
Relay
Word
Bits
Relay
Word
Bit
67P2
67P2T
q
50P2
67P2TC
SELOGIC
Setting
67P2D
0
Directional Control
(asserted to logical 1
continuously if E32 = N)
SEL
OGIC
Torque Control
w
(Level 2)
Level 2
(Setting
E5OP ≥ 2)
Relay
Word
Bit
Courtesy of NationalSwitchgear.com