9.24
SEL-351A Relay Instruction Manual Date Code 20080213
Setting the Relay
Relay Word Bits (Used in SEL
OGIC Control Equations)
19 59C1 C-phase instantaneous overvoltage element
(C phase voltage above pickup setting 59P1P; see Figure 3.22)
59A2 A-phase instantaneous overvoltage element
(A phase voltage above pickup setting 59P2P; see Figure 3.22)
59B2 B-phase instantaneous overvoltage element
(B phase voltage above pickup setting 59P2P; see Figure 3.22)
59C2 C-phase instantaneous overvoltage element
(C phase voltage above pickup setting 59P2P; see Figure 3.22)
27AB AB-phase-to-phase instantaneous undervoltage element
(AB-phase-to-phase voltage below pickup setting 27PP;
see Figure 3.23 and Figure 3.24)
27BC BC-phase-to-phase instantaneous undervoltage element
(BC-phase-to-phase voltage below pickup setting 27PP;
see Figure 3.23 and Figure 3.24)
27CA CA-phase-to-phase instantaneous undervoltage element
(CA-phase-to-phase voltage below pickup setting 27PP;
see Figure 3.23 and Figure 3.24)
59AB AB-phase-to-phase instantaneous overvoltage element
(AB-phase-to-phase voltage above pickup setting 59PP;
see Figure 3.23 and Figure 3.24)
20 59BC BC-phase-to-phase instantaneous overvoltage element
(BC-phase-to-phase voltage above pickup setting 59PP;
see Figure 3.23 and Figure 3.24)
59CA CA-phase-to-phase instantaneous overvoltage element
(CA-phase-to-phase voltage above pickup setting 59PP;
see Figure 3.23 and Figure 3.24)
59N1 Zero-sequence instantaneous overvoltage element
(zero-sequence voltage above pickup setting 59N1P; see Figure 3.23)
59N2 Zero-sequence instantaneous overvoltage element
(zero-sequence voltage above pickup setting 59N2P; see Figure 3.23)
59Q Negative-sequence instantaneous overvoltage element
(negative-sequence voltage above pickup setting 59QP;
see Figure 3.23 and Figure 3.25)
59V1 Positive-sequence instantaneous overvoltage element (positive-sequence
voltage above pickup setting 59V1P; see Figure 3.23 and Figure 3.25)
27S
b
Channel VS instantaneous undervoltage element
(channel VS voltage below pickup setting 27SP; see Figure 3.26)
59S1
b
Channel VS instantaneous overvoltage element (channel VS voltage
above pickup setting 59S1P; see Figure 3.26)
Table 9.6 Relay Word Bit Definitions for SEL-351A (Sheet 7 of 16)
Row Bit Definition Primary Application
Courtesy of NationalSwitchgear.com
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