Schweitzer Engineering SEL-387-0, Instruction Manual

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Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Section 9
Event Reports and SER
Overview
The SEL-387 Relay offers two styles of event reports:
➤
Standard 15-, 30-, or 60-cycle event reports
➤
Sequential Events Recorder (SER) report
These event reports contain date, time, current, relay element, optoisolated
input, and output contact information.
The relay generates (triggers) standard 15-, 30-, or 60-cycle event reports by
fixed and programmable conditions. These reports show information for 15,
30, or 60 continuous cycles depending on the Global setting LER. The length
of the pre-fault data contained in the event report is determined by the Global
setting PRE. This setting allows for 1 to (LER-1) cycles of pre-fault data in
each event report. The number of event reports stored in nonvolatile memory
depends on the LER setting as follows:
The number of events saved will be fewer if mixed lengths (e.g., LER = 60 for
3 event reports and then changed to LER = 30) are stored together or if the
relay is subjected to frequent power-down/power-up cycles.
If the relay nonvolatile memory is full and another event is triggered, the latest
event report will overwrite the oldest event report, and the oldest event report
will be lost. See
Figure 9.2 for an example standard 15-cycle event report.
The relay adds lines in the Sequential Events Recorder (SER) report by
programmable conditions only. 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 9.8 for an
example SER report.
LER Number of Event Reports Saved
15 8–21
30 12–14
60 7