6.8
SEL-734 Meter Instruction Manual Date Code 20090730
Power Quality and Event Analysis
Sequential Events Recorder (SER) Report
Sequential Events Recorder (SER) Report
See Figure 6.4 for an example SER report.
SER Triggering
The meter triggers (generates) an entry in the SER report for a change of state
of any one of the elements listed in the SER1, SER2, and SER3 trigger
settings. The factory default settings are:
SER1 = NA
SER2 = NA
SER3 = NA
The elements are Meter Word bits referenced in Table 9.3. The meter monitors
each element in the SER lists every processing interval (25 ms). If an element
changes state, the meter time-tags the changes in the SER.
The meter adds a message to the SER to indicate power up, daylight saving
time or other time changes, or settings change conditions:
Meter 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 as many as 24 element names in each of the SER settings via the SET R
command. See Table 9.3 for references to valid Meter element (Meter Word
bit) names. See the SET R command in Tabl e 9.1 and corresponding SEL-734
Settings Sheets at the end of Section 9: Settings. Use commas to delimit the
elements. For example, if you enter setting SER1 as:
SER1 = IN101 SV01 FAULT
The meter displays the setting as:
SER1 = IN101, SV01, FAULT
The meter can monitor as many as 72 elements in the SER (24 in each of
SER1, SER2, and SER3).
Make Sequential
Events Recorder
(SER) Settings
With Care
The meter 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. The meter retains a minimum of 682 of the most recent
SER entries in nonvolatile memory. The meter can hold a maximum of 1365
entries. When the recorder memory reaches 1365 entries and further entries
occur, the oldest 682 memory locations are cleared in a block to make room
for newer entries. Therefore, the apparent SER memory size can vary between
682 and 1365 entries. An average of one state change every three minutes can
occur for a 25-year meter service life.
Courtesy of NationalSwitchgear.com
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