Schweitzer Engineering Laboratories SEL-311C - Synchrophasor-Level Accuracy in Event Reports; Table 12.2 Example EVE Commands

12.7
Date Code 20060320 Instruction Manual SEL-311C Relay
Standard Event Reports and SER
Standard 15/30/60/180-Cycle Event Reports
Table 12.2 presents example uses of the EVE command.
If an event report is requested that does not exist, the relay responds
Invalid
Event.
Synchrophasor-Level
Accuracy in Event
Reports
The SEL-311C provides the option to display event report data aligned to a
high-accuracy time source by adding the P parameter. The header indicates the
availability of a high-accuracy time source by displaying the status of Relay
Word bit TSOK. The
Time: value in the header includes three additional
digits. These represent 100 µs, 10 µs, and 1 µs. The 1 µs digit is always
displayed as zero. The
Time: value contains the time stamp of the analog
value associated with the trigger point. Furthermore, the
FREQ column in the
analog section of the report is replaced by a
DT column. DT means “Difference
Time.” It represents the difference time in units of microseconds from another
row. The trigger point shall have a DT value of 0000 because the trigger time
corresponds to the time displayed in the event report header. The DT value for
rows preceding the trigger point is referenced to the following row (so they
increment backwards in time). The DT value for rows following the trigger
point is referenced to the previous row (so they increment forwards in time). If
TSOK = logical 0, this event report display option is not available.
Figure 12.2 shows how an event report is modified with the P parameter.
M Specifies only that the communication elements section of
the event is displayed.
P Precise to synchrophasor level accuracy for signal content
at nominal frequency. This option is available when
TSOK = logical 1. The P option implies R as only raw
analog data is available with this accuracy. When M or D
are specified with P, then the P option is ignored since it
only pertains to analog data.
Table 12.2 Example EVE Commands
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 S16 L10 Display 10 cycles of the most recent report at 1/16-cycle resolution.
EVE C 2 Display the second report in
Compressed ASCII format at 1/4-cycle resolution.
EVE L Display most recent report at 1/16-cycle resolution.
EVE R Display most recent report at
1/16-cycle resolution; analog and digital data are unfiltered (raw).
EVE 2 D L10 Display 10 cycles of the protection and control
elements section of the second event report at 1/4-cycle resolution.
EVE 2 A R S4 Display the unfiltered analog section
of the second event report at 1/4-cycle resolution.