Schweitzer Engineering Laboratories SEL-351A - Page 331

9.21
Date Code 20080213 Instruction Manual SEL-351A Relay
Setting the Relay
Relay Word Bits (Used in SEL
OGIC Control Equations)
11 50G1 Level 1 residual-ground instantaneous overcurrent element (residual-
ground current above pickup setting 50G1P; see Figure 3.10)
Tripping, Testing, Control
50G2 Level 2 residual-ground instantaneous overcurrent element (residual-
ground current above pickup setting 50G2P; see Figure 3.10)
50G3 Level 3 residual-ground instantaneous overcurrent element (residual-
ground current above pickup setting 50G3P; see Figure 3.10)
50G4 Level 4 residual-ground instantaneous overcurrent element (residual-
ground current above pickup setting 50G4P; see Figure 3.10)
50Q1
a
Level 1 negative-sequence instantaneous overcurrent element (negative-
sequence current above pickup setting 50Q1P; see Figure 3.12)
Testing, Control
50Q2
a
Level 2 negative-sequence instantaneous overcurrent element (negative-
sequence current above pickup setting 50Q2P; see Figure 3.12)
50Q3
a
Level 3 negative-sequence instantaneous overcurrent element (negative-
sequence current above pickup setting 50Q3P; see Figure 3.12)
50Q4
a
Level 4 negative-sequence instantaneous overcurrent element (negative-
sequence current above pickup setting 50Q4P; see Figure 3.12)
12 67G1
b
Level 1 residual-ground instantaneous overcurrent element
(derived from 50G1; see Figure 3.10)
Tripping, Testing, Control
67G2
b
Level 2 residual-ground instantaneous overcurrent element
(derived from 50G2; see Figure 3.10)
67G3
b
Level 3 residual-ground instantaneous overcurrent element
(derived from 50G3; see Figure 3.10)
67G4
b
Level 4 residual-ground instantaneous overcurrent element
(derived from 50G4; see Figure 3.10)
67Q1
a
,
b
Level 1 negative-sequence instantaneous overcurrent element
(derived from 50Q1; see Figure 3.12)
Testing, Control
67Q2
a, b
Level 2 negative-sequence instantaneous overcurrent element
(derived from 50Q2; see Figure 3.12)
67Q3
a
,
b
Level 3 negative-sequence instantaneous overcurrent element
(derived from 50Q3; see Figure 3.12)
67Q4
a
,
b
Level 4 negative-sequence instantaneous overcurrent element
(derived from 50Q4; see Figure 3.12)
13 67G1T
b
Level 1 residual-ground definite-time overcurrent element 67G1T timed
out (derived from 67G1; see Figure 3.10)
Tripping
67G2T
b
Level 2 residual-ground definite-time overcurrent element 67G2T timed
out (derived from 67G2; see Figure 3.10)
67G3T
b
Level 3 residual-ground definite-time overcurrent element 67G3T timed
out (derived from 67G3; see Figure 3.10)
67G4T
b
Level 4 residual-ground definite-time overcurrent element 67G4T timed
out (derived from 67G4; see Figure 3.10)
67Q1T
a
,
b
Level 1 negative-sequence definite-time overcurrent element 67Q1T
timed out (derived from 67Q1; see Figure 3.12)
67Q2T
a
,
b
Level 2 negative-sequence definite-time overcurrent element 67Q2T
timed out (derived from 67Q2; see Figure 3.12)
67Q3T
a
,
b
Level 3 negative-sequence definite-time overcurrent element 67Q3T
timed out (derived from 67Q3; see Figure 3.12)
67Q4T
a
,
b
Level 4 negative-sequence definite-time overcurrent element 67Q4T
timed out (derived from 67Q4; see Figure 3.12)
Table 9.6 Relay Word Bit Definitions for SEL-351A (Sheet 4 of 16)
Row Bit Definition Primary Application
Courtesy of NationalSwitchgear.com