Sel 551 - Example Standard 15-Cycle Event Report

7.11
Date Code 20110408 Instruction Manual SEL-551 Relay
Standard Event Reports and SER
Example Standard 15-Cycle Event Report
If Y is entered, the relay clears the SER event reports from nonvolatile
memory. If
N is entered, no reports are cleared, and the relay responds:
Canceled
SER Event Report
Column Definitions
Refer to the example SER event report in Figure 7.5 to view SER event report
columns. Note in Figure 7.5 that a row in the SER event report is actually two
lines long; the first line contains row, date, time, and any written message, and
the second line contains the current and the other relay information.
The column definitions in Table 7.2 and Table 7.3 also apply to the columns of
the SER Event Report. The SER Event Report has a few additional columns:
The SER event report current columns (
IA, IB, IC, IN, and IG) display rms
primary current magnitude values, rather than sampled current values, as the
standard event report current columns do.
Example Standard 15-Cycle Event Report
The following example SEL-551 standard 15-cycle event report in Figure 7.2
also corresponds to the example sequential events recorder (SER) event report
in Figure 7.5. The circled, numbered comments in both these figures are
explained in the text following Figure 7.5.
In Figure 7.2, the arrow (
>) in the column following the IG current 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 IG current column identifies the
row with the maximum phase current. The maximum phase current is
calculated from the row identified with the asterisk and the row one quarter-
cycle previous (see Figure 7.3). These currents are listed at the end of the
example event report. If the trigger row (
>) and the maximum phase current
row (
*) are the same row, the * symbol takes precedence and is displayed.
Column Heading Definition
Row SER event report row number (1–512)
Date Date that the SER event report row was triggered
Time Time (24-hour time) that the SER event report row was triggered