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Date Code 990215 Standard Event Reports and SER 12-7
SEL-351P Manual Técnico
Compressed ASCII Event Reports
The SEL-351P provides compressed ASCII event reports to facilitate event report storage and
display. The SEL-2020 Communications Processor and the SEL-5601 Analytic Assistant
software take advantage of the compressed ASCII format. Use the EVE C command or
CEVENT command to display compressed ASCII event reports. See the CEVENT command
discussion in
Appendix E: Compressed ASCII Commands for further information.
Filtered and Unfiltered Event Reports
The SEL-351P samples the basic power system measurands (ac voltage, ac current, and
optoisolated inputs) 16 times per power system cycle. The control filters the measurands to
remove transient signals, operates on the filtered values, and reports them in the event report.
To view the raw inputs to the control, select the unfiltered event report (e.g., EVE R). Use the
unfiltered event reports to observe:
•
Power system harmonics on channels IA, IB, IC, IG, VA, VB, VC, VS
•
Decaying dc offset during fault conditions on IA, IB, IC
•
Optoisolated input contact bounce on channels IN101 through IN106
The filters for ac current and voltage are fixed. You can adjust the optoisolated input debounce
via debounce settings (see Figure 7.1 in
Section 7: Inputs, Outputs, Timers, and Other Control
Logic ).
Raw event reports display one extra cycle of data at the beginning of the report.
Clearing Standard Event Report Buffer
The HIS C command clears the event summaries and corresponding standard event reports from
nonvolatile memory. See
Section 10: Serial Port Communications and Commands for more
information on the HIS (Event Summaries/History) command.
Standard Event Report Column Definitions
Refer to the example event report in Figure SECTION 12: .2 to view event report columns
(
Note : Figure SECTION 12: .2 is on multiple pages). This example event report displays rows
of information each 1/4 cycle retrieved with the EVE command.
The columns contain ac current, ac voltage, frequency, output, input, and protection and control
element information.