12.24
SEL-351A Relay Instruction Manual Date Code 20080213
Standard Event Reports and SER
Example Standard 15-Cycle Event Report
Example Standard 15-Cycle Event Report
The following example standard 15-cycle event report in Figure 12.3 (with
wye-connected voltages) also corresponds to the example sequential events
recorder (SER) report in Figure 12.7. The circled numbers in Figure 12.3
correspond to the SER row numbers in Figure 12.7. The row explanations
follow Figure 12.7.
In Figure 12.3, the arrow (
>) in the column following the Freq column
identifies the trigger row. This is the row that corresponds to the
Date and
Time values at the top of the event report.
The asterisk (
*) in the column following the Freq column identifies the row
with the maximum phase current, which is determined from the filtered
values. The maximum phase current is calculated from the row identified with
the asterisk and the row one quarter-cycle previous (see Figure 12.5 and
Figure 12.6). These currents are listed at the end of the event report in the
event summary. If the trigger row (
>) and the maximum phase current row (*)
are the same row, the
* symbol takes precedence.
Since the maximum phase current is determined from the filtered values, the
asterisk (
*) is not displayed in the unfiltered (raw) event report. The asterisk
(
*) is only displayed in the filtered event report.
Courtesy of NationalSwitchgear.com
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