Date Code 20001006 Setting the Relay 9-35
SEL-351 Instruction Manual
Row Bit Definition
Primary
Application
49
(53)
SAGA
SAGB
SAGC
SAG3P
SWA
SWB
SWC
SW3P
A-phase voltage sag element
B-phase voltage sag element
C-phase voltage sag element
3-phase voltage sag element
A-phase voltage swell element
B-phase voltage swell element
C-phase voltage swell element
3-phase voltage swell element
(only operable in
Firmware
Versions 3
and 4)
** IMPORTANT: See Appendix F for special instructions on setting negative-sequence
overcurrent elements.
*** The Open Command (Relay Word bit OC) and Close Command (Relay Word bit CC) are
no longer embedded in the Trip Logic (see Figure 5.1) and Close Logic (see Figure 6.1),
respectively. See the Note following Figure 5.2 and the Note in the Lockout State
discussion, following Table 6.1, concerning the OC Relay Word bit (OPEN command). See
the Note in the Set Close discussion, following Figure 6.1, concerning the CC Relay Word
bit (CLOSE command).
SETTINGS EXPLANATIONS
Note that most of the settings in the settings sheets that follow include references for additional
information. The following explanations are for settings that do not have reference information
anywhere else in the instruction manual.
Identifier Labels
Refer to Settings Sheet 1 of 23.
The SEL-351 Relay has two identifier labels: the Relay Identifier (RID) and the Terminal Identi-
fier (TID). The Relay Identifier is typically used to identify the relay or the type of protection
scheme. Typical Terminal Identifiers include an abbreviation of the substation name and line
terminal.
The relay tags each report (event report, meter report, etc.) with the Relay Identifier and Terminal
Identifier. This allows you to distinguish the report as one generated for a specific breaker and
substation.
RID and TID settings may include the following characters: 0-9, A-Z, -, /, ., space. These two
settings cannot be made via the front-panel interface.
Courtesy of NationalSwitchgear.com
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