Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER
SEL-351 Instruction Manual
12-1
SECTION 12: STANDARD EVENT REPORTS, SAG/SWELL/
INTERRUPTION REPORT, AND SER
INTRODUCTION
The SEL-351 Relay offers two styles of event reports:
• Standard 15/30-cycle event reports.
• Sequential events recorder (SER) report.
Resolution: 1 ms
Accuracy: +1/4 cycle
These event reports contain date, time, current, voltage, frequency, relay element, optoisolated
input, output contact, and fault location information.
The relay generates (triggers) standard 15/30-cycle event reports by fixed and programmable
conditions. These reports show information for 15 or 30 continuous cycles. The relay stores the
most recent event report data in nonvolatile memory. See Table 12.1 for the minimum number of
events stored, which depends on the LER setting (see the following subsection), and the firmware
version of the relay (see Table 1.2). If the event memory is full and more reports are triggered, the
latest event report overwrites the oldest event report. See Figure 12.2 for an example standard 15-
cycle event report.
Table 12.1: Minimum Event Report Capacity in Nonvolatile Memory
Firmware Version LER = 15 Cycles LER = 30 Cycles
0, 1, or 2 30 15
3 or 4 14 7
The relay adds lines in the sequential events recorder (SER) report for a change of state of a
programmable condition. The SER lists date and time-stamped lines of information each time a
programmed condition changes state. The relay stores the latest 512 lines of the SER report in
nonvolatile memory. If the report fills up, newer rows overwrite the oldest rows in the report. See
Figure 12.5 for an example SER report.
STANDARD 15/30-CYCLE EVENT REPORTS
See Figure 12.2 for an example event report (Note: Figure 12.2 is on multiple pages).
Event Report Length (Settings LER and PRE)
The SEL-351 Relay provides user-programmable event report length and prefault length. Event
report length is either 15 or 30 cycles. Prefault length ranges from 1 to 29 cycles. Prefault length
is the first part of the event report that precedes the event report triggering point.
Courtesy of NationalSwitchgear.com
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