Schweitzer Engineering Laboratories SEL-351A, Manual

Page: 479 / 666

12.7
Date Code 20080213
Instruction Manual SEL-351A Relay
Standard Event Reports and SER
Standard 15/30-Cycle Event Reports
If an event report is requested that does not exist, the relay responds:
Invalid Event
Synchrophasor-Level
Accuracy in Event
Reports
The SEL-351A 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 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
μ
s, 10
μ
s, and 1
μ
s. The 1
μ
s 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 display 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 forward 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.
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 V Display the unfiltered analog section of the second event report at
1/4 cycle resolution, with variable scaling of the analog values.
Serial Port
Command
Description
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