Schweitzer Engineering Laboratories SEL-701, Instruction Manual

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701 Motor Protection Relay
Date Code 20010719
Event Analysis
Event Reports
9.8
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 &
Relay Logic .
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 9.2 . Table 9.3 lists example EVE commands.
Table 9.2 Event Commands
Table 9.3 EVE Command Options
The SEL-701 Relay 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. Raw event reports and the compressed event format that the SEL-701PC
Table 9.2 Event Commands
Event n R
Where:
n Event number (1–14). 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 9.3 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).