12-24 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006
SEL-351 Instruction Manual
The relay adds a message to the SER to indicate power up or settings change (to active setting
group) conditions:
Relay newly powered up or settings changed
Each entry in the SER includes SER row number, date, time, element name, and element state.
Making SER Trigger Settings
Enter up to 24 element names in each of the SER settings via the SET R command. See Table 9.3
for references to valid relay element (Relay Word bit) names. See the SET R command in
Table 9.1 and corresponding Settings Sheet 19 of 22 at the end of Section 9: Setting the Relay.
Use either spaces or commas to delimit the elements. For example, if you enter setting SER1 as:
SER1 = 51P,51G 51PT,,51GT , 50P1, , 50P2
The relay displays the setting as:
SER1 = 51P 51G 51PT 51GT 50P1 50P2
The relay can monitor up to 72 elements in the SER (24 in each of SER1, SER2, and SER3).
Make Sequential Events Recorder (SER) Settings With Care
The relay triggers a row in the Sequential Events Recorder (SER) event report for any change of
state in any one of the elements listed in the SER1, SER2, or SER3 trigger settings. Nonvolatile
memory is used to store the latest 512 rows of the SER event report so they can be retained during
power loss. The nonvolatile memory is rated for a finite number of "writes." Exceeding the limit
can result in an EEPROM self-test failure. An average of four state changes per minute can be
made for a 25-year relay service life.
Retrieving SER Reports
The relay saves the latest 512 rows of the SER in nonvolatile memory. Row 1 is the most recently
triggered row, and row 512 is the oldest. View the SER report by date or SER row number as
outlined in the examples below.
Example SER
Serial Port
Commands Format
SER If SER is entered with no numbers following it, all available rows are
displayed (up to row number 512). They display with the oldest row at
the beginning (top) of the report and the latest row (row 1) at the end
(bottom) of the report. Chronological progression through the report is
down the page and in descending row number.
SER 17 If SER is entered with a single number following it (17 in this example),
the first 17 rows are displayed, if they exist. They display with the oldest
row (row 17) at the beginning (top) of the report and the latest row (row
Courtesy of NationalSwitchgear.com
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