Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

Page: 217 / 452

Date Code 20011009
SEL-701-1 Monitor
Event Analysis
Event Reports
8.7
Event Reports
The SEL-701-1 Monitor captures and stores detailed information concerning the
monitor measurements, protection element status, and contact input/output status. The
monitor stores the 14 most recent event reports in nonvolatile memory. Each report is
numbered; older reports have higher numbers. After the monitor reaches the storage
limit, it discards the oldest report every time it captures a new report.
If you cannot determine the root cause of a monitor trip operation after using the
analysis tools described earlier in this section, analyze the event report associated with
the trip. Each event report contains the following information:
Date and time of the event.
Fifteen (15) cycles of current, voltage, protection element, input, and
output data.
Event summary data, described in History Data & Event Summaries
on page 8.5 .
Monitor settings.
The following discussion covers these areas:
What causes the monitor to save an event report?
How do I retrieve new event data?
What does the event data mean?
Event Report Triggering
The monitor triggers an event report when any of the following occur:
The monitor trips.
A user executes the serial port TRIGGER command or serial port or
front-panel PULSE command or STOP command.
Any of the programmable event triggering conditions occur (see below).
The factory default logic settings include settings that cause the monitor to trigger
an event report when any of the following conditions occur:
Thermal Element Alarm.
Load-Loss Alarm.
Current Unbalance Alarm.
Underpower Element Alarm.
Reactive Power Element Alarm.
Power Factor Element Alarm.
Dropout of any Over- or Underfrequency Element.
If your application requires different performance, you can change these settings
by following the steps described in Appendix B: SELogic® Control Equations and
Monitor Logic .