Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

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SEL-701-1 Monitor
Date Code 20011009
Event Analysis
Event Reports
8.8
Retrieving Event Reports
Use the serial port EVENT command to retrieve event reports. There are several
options for customizing the report format. The general command format is shown in
Table 8.2 . Table 8.3 lists example EVE commands.
The SEL-701-1 Monitor also provides a facility to allow you to download event
report data using Modbus
â
protocol and the rear-panel serial port. For more
information, see Appendix C: Modbus® RTU Communications Protocol .
Event Report Data Column Definitions
The event report data is arranged in columns and rows. Each column includes a
single type of data such as A-phase current samples or the state of two output contacts.
Each row displays the measurements and results of a single instant in time. Event
reports you view using the
EVENT command contain four samples per power system
cycle. In event reports, time runs down the page; first occurrences are shown at the top
of the page, final conditions at the bottom. Events contain 4 cycles of pretrigger data
and 11 cycles of posttrigger data to show the motor and system conditions before,
during, and after the fault. Definitions and descriptions of the event report data
columns are shown in
Table 8.4 and Table 8.5 .
Table 8.2 Event Commands
Event n R
Where:
n
Event number (1-13). Defaults to 1 if not listed, where 1 is the
most recent event. If you request an event that does not exist, the
relay responds "Invalid Event."
R
Specifies the unfiltered (raw) event report. Displays 16 samples
per cycle.
Table 8.3 EVE Command Options
Serial Port
Command
Description
EVE Display the most recent event report at 1/4-cycle resolution.
EVE 2 Display the second event report at 1/4-cycle resolution.
EVE R Display most recent report at 1/16-cycle resolution; analog data
are not digitally filtered (raw).