9.20
SEL-351A Relay Instruction Manual Date Code 20080213
Setting the Relay
Relay Word Bits (Used in SEL
OGIC Control Equations)
8 50P1 Level 1 phase instantaneous overcurrent element
(= 50A1 + 50B1 + 50C1; see Figure 3.1)
Tripping, Testing, Control
50P2 Level 2 phase instantaneous overcurrent element
(= 50A2 + 50B2 + 50C2; see Figure 3.1)
50P3 Level 3 phase instantaneous overcurrent element
(= 50A3 + 50B3 + 50C3; see Figure 3.1)
50P4 Level 4 phase instantaneous overcurrent element
(= 50A4 + 50B4 + 50C4; see Figure 3.1)
50N1 Level 1 neutral-ground instantaneous overcurrent element [neutral-ground
current (channel IN) above pickup setting 50N1P; see Figure 3.8]
50N2 Level 2 neutral-ground instantaneous overcurrent element [neutral-ground
current (channel IN) above pickup setting 50N2P; see Figure 3.8]
50N3 Level 3 neutral-ground instantaneous overcurrent element [neutral-ground
current (channel IN) above pickup setting 50N3P; see Figure 3.8]
50N4 Level 4 neutral-ground instantaneous overcurrent element [neutral-ground
current (channel IN) above pickup setting 50N4P; see Figure 3.8]
967P1
b
Level 1 phase instantaneous overcurrent element
(derived from 50P1; see Figure 3.3)
67P2
b
Level 2 phase instantaneous overcurrent element
(derived from 50P2; see Figure 3.3)
67P3
b
Level 3 phase instantaneous overcurrent element
(derived from 50P3; see Figure 3.3)
67P4
b
Level 4 phase instantaneous overcurrent element
(derived from 50P4; see Figure 3.3)
67N1
b
Level 1 neutral-ground instantaneous overcurrent element
(derived from 50N1; see Figure 3.8)
67N2
b
Level 2 neutral-ground instantaneous overcurrent element
(derived from 50N2; see Figure 3.8)
67N3
b
Level 3 neutral-ground instantaneous overcurrent element
(derived from 50N3; see Figure 3.8)
67N4
b
Level 4 neutral-ground instantaneous overcurrent element
(derived from 50N4; see Figure 3.8)
10 67P1T
b
Level 1 phase definite-time overcurrent element 67P1T timed out
(derived from 67P1; see Figure 3.3)
Tripping
67P2T
b
Level 2 phase definite-time overcurrent element 67P2T timed out (derived
from 67P2; see Figure 3.3)
67P3T
b
Level 3 phase definite-time overcurrent element 67P3T timed out (derived
from 67P3; see Figure 3.3)
67P4T
b
Level 4 phase definite-time overcurrent element 67P4T timed out (derived
from 67P4; see Figure 3.3)
67N1T
b
Level 1 neutral-ground definite-time overcurrent element 67NIT timed
out (derived from 67N1; see Figure 3.8)
67N2T
b
Level 2 neutral-ground definite-time overcurrent element 67N2T timed
out (derived from 67N2; see Figure 3.8)
67N3T
b
Level 3 neutral-ground definite-time overcurrent element 67N3T timed
out (derived from 67N3; see Figure 3.8)
67N4T
b
Level 4 neutral-ground definite-time overcurrent element 67N4T timed
out (derived from 67N4; see Figure 3.8)
Table 9.6 Relay Word Bit Definitions for SEL-351A (Sheet 3 of 16)
Row Bit Definition Primary Application
Courtesy of NationalSwitchgear.com
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