9.18
SEL-351A Relay Instruction Manual Date Code 20080213
Setting the Relay
Relay Word Bits (Used in SEL
OGIC Control Equations)
Table 9.6 Relay Word Bit Definitions for SEL-351A (Sheet 1 of 16)
Row Bit Definition Primary Application
2 50A1 Level 1 A-phase instantaneous overcurrent element
(A-phase current above pickup setting 50P1P; see Figure 3.1)
Tripping, Control
50B1 Level 1 B-phase instantaneous overcurrent element
(B-phase current above pickup setting 50P1P; see Figure 3.1)
50C1 Level 1 C-phase instantaneous overcurrent element
(C-phase current above pickup setting 50P1P; see Figure 3.1)
50A2 Level 2 A-phase instantaneous overcurrent element
(A-phase current above pickup setting 50P2P; see Figure 3.1)
50B2 Level 2 B-phase instantaneous overcurrent element
(B-phase current above pickup setting 50P2P; see Figure 3.1)
50C2 Level 2 C-phase instantaneous overcurrent element
(C-phase current above pickup setting 50P2P; see Figure 3.1)
50A3 Level 3 A-phase instantaneous overcurrent element
(A-phase current above pickup setting 50P3P; see Figure 3.1)
50B3 Level 3 B-phase instantaneous overcurrent element
(B-phase current above pickup setting 50P3P; see Figure 3.1)
3 50C3 Level 3 C-phase instantaneous overcurrent element
(C-phase current above pickup setting 50P3P; see Figure 3.1)
50A4 Level 4 A-phase instantaneous overcurrent element
(A-phase current above pickup setting 50P4P; see Figure 3.1)
50B4 Level 4 B-phase instantaneous overcurrent element
(B-phase current above pickup setting 50P4P; see Figure 3.1)
50C4 Level 4 C-phase instantaneous overcurrent element
(C-phase current above pickup setting 50P4P; see Figure 3.1)
50AB1 Level 1 AB-phase-to-phase instantaneous overcurrent element
(AB-phase-to-phase current above pickup setting 50PP1P; see Figure 3.7)
50BC1 Level 1 BC-phase-to-phase instantaneous overcurrent element
(BC-phase-to-phase current above pickup setting 50PP1P; see Figure 3.7)
50CA1 Level 1 CA-phase-to-phase instantaneous overcurrent element
(CA-phase-to-phase current above pickup setting 50PP1P; see Figure 3.7)
50AB2 Level 2 AB-phase-to-phase instantaneous overcurrent element
(AB-phase-to-phase current above pickup setting 50PP2P; see Figure 3.7)
4 50BC2 Level 2 BC-phase-to-phase instantaneous overcurrent element
(BC-phase-to-phase current above pickup setting 50PP2P; see Figure 3.7)
50CA2 Level 2 CA-phase-to-phase instantaneous overcurrent element
(CA-phase-to-phase current above pickup setting 50PP2P; see Figure 3.7)
50AB3 Level 3 AB-phase-to-phase instantaneous overcurrent element
(AB-phase-to-phase current above pickup setting 50PP3P; see Figure 3.7)
50BC3 Level 3 BC-phase-to-phase instantaneous overcurrent element
(BC-phase-to-phase current above pickup setting 50PP3P; see Figure 3.7)
50CA3 Level 3 CA-phase-to-phase instantaneous overcurrent element
(CA-phase-to-phase current above pickup setting 50PP3P; see Figure 3.7)
50AB4 Level 4 AB-phase-to-phase instantaneous overcurrent element
(AB-phase-to-phase current above pickup setting 50PP4P; see Figure 3.7)
50BC4 Level 4 BC-phase-to-phase instantaneous overcurrent element
(BC-phase-to-phase current above pickup setting 50PP4P; see Figure 3.7)
50CA4 Level 4 CA-phase-to-phase instantaneous overcurrent element
(CA-phase-to-phase current above pickup setting 50PP4P; see Figure 3.7)
Courtesy of NationalSwitchgear.com
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