Date Code 20011009
SEL-701-1 Monitor
Event Analysis
History Data & Event Summaries
8.5
History Data & Event Summaries
Each time the SEL-701-1 Monitor trips, and in response to other selected
conditions, the monitor captures motor current, voltage (if included), RTD (if
included), protection element, contact input, and contact output information. This
collection of data is called an event report and is described in detail in
The monitor stores the 13 most recent event reports and their summaries in
nonvolatile memory. These reports are numbered 1 through 13, older reports having
higher numbers. When the monitor stores a new report, it discards the oldest report if
13 reports are already in memory.
The monitor also stores an event summary associated with each event report. Each
event summary contains selected data acquired at the instant the monitor tripped or at
the instant the event was triggered if a trip did not occur during the event. Use the
summary data to help discern the cause of monitor trip operations before you review
the full event report.
View the present collection of event summaries using the front-panel History Data
menu selection or the serial port
HISTORY
command. Each event summary contains:
The type of event, from the list of event type strings in
Appendix C: Modbus® RTU Communications Protocol
.
The event number, date, and time.
The system frequency.
The % Thermal Capacity used.
The % Unbalance Current.
The magnitudes of the phase, neutral, residual, and negative-sequence
currents.
The temperatures of the hottest winding, bearing, ambient, and other
RTDs, if included.
The magnitudes of the phase-to-phase voltages, if included.
The magnitudes of the real power, reactive power, and power factor, if
voltages are included.
The following table provides a list of event triggering commands and their
equivalent names reported in the Event/History reports. For example, if the event is
stored in response to execution of the serial port
TRIGGER
command, the
Event/History report will list the event type as TRIG.
Содержание SEL-701-1
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