Date Code 20010719
701 Motor Protection Relay
Event Analysis
Event Reports
9.7
Event Reports
The SEL-701 Relay captures and stores detailed information concerning the relay
measurements, protection element status, and contact input/output status. The relay
stores the 14 most recent event reports in nonvolatile memory. Each report is
numbered; older reports have higher numbers. After the relay 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 relay 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
.
Relay settings.
The following discussion covers these areas:
What causes the relay to save an event report?
How do I retrieve new event data?
What does the event data mean?
SEL-701PC software supports oscillographic event retrieval and analysis. Refer to
the SEL-701PC Help function for more details.
Event Report Triggering
The relay triggers an event report when any of the following occur:
The relay 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 relay 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.
Содержание SEL-701
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