Schweitzer Engineering Laboratories SEL-321 - Computer Event Report; Interpretation of Quarter-Cycle Voltage and Current Data; Long Event Report; MIRRORED BITS Display Event Report

4-4 Event Reporting Date Code 20011026
SEL-321/321-1 Instruction Manual
LONG EVENT REPORT
The long event report is output in response to the EVENT x L command. The Header, Summary
and Settings sections of the long report are identical to the default report. The event report body
differs as follows:
The "L" format option increases the event report resolution to 16 samples/cycle. The bodies of
the 4 and 16 samples/cycle reports differ as follows:
• The 16 samples/cycle report has four times as many data rows (total of 11 cycles ⋅ 16
rows/cycle = 176 rows).
• The element and contact input and output columns are sampled every 1/8-cycle, and
displayed in 1/16-cycle format. If an element asserts for 1/8-cycle, it would indicate
assertion for two rows in the long event report.
COMPUTER EVENT REPORT
Generate the computer event report using the EVENT x C command. This format provides
complete relay element data by attaching a hexadecimal representation of the relay elements on a
per processing interval basis. This report is an 11-cycle duration, 16 samples/cycle report. All
inputs, outputs, and relay elements are shown in the computer event report.
UNFILTERED EVENT REPORT
Generate the unfiltered event report using the EVENT x U command. These reports are identical
to the EVE C event report, except that the analog data are not digitally filtered. Use the
unfiltered event report in computer analysis of data.
MIRRORED BITS™ DISPLAY EVENT REPORT
Generate an event report where TMB1...TMB8 replaces OUT1...OUT8 and RMB1...RMB8
replaces IN1...IN8 by appending any of the event report commands listed above with a space M.
With the exception of the display of the first eight inputs and outputs, the remainder of the M
form of the event report is identical.
INTERPRETATION OF QUARTER-CYCLE VOLTAGE AND CURRENT DATA
The relay uses secondary quantities presented to the input terminals of the relay. One line of
data is displayed for each quarter-cycle. Voltages and currents are shown in primary quantities.
The value in each column of the default event report is calculated and scaled as follows:
I
R
Calculated I
R
value, multiplied by CTR from group active at time of trigger.
I
A
, I
B
, I
C
Sampled, filtered value, multiplied by CTR from group active at time of trigger.
V
A
, V
B
, V
C
Sampled, filtered value, multiplied by PTR from group active at time of trigger.