Sel 551 - Table 7.2 Standard Event Report Current Columns

7.5
Date Code 20110408 Instruction Manual SEL-551 Relay
Standard Event Reports and SER
Standard 15-Cycle Event Reports
The EVENT serial port commands can be entered with only the first three
letters of the word EVENT. For example, the second most recent 1/8-cycle
resolution event report can be retrieved by entering command:
=>EVE L 2 <Enter>
Clearing Standard
Event Report Buffer
The HIS C command clears the event summaries and corresponding full-
length standard event reports from nonvolatile memory. See the HIS
Command (History) on page 5.13 for more information.
Standard Event
Report Column
Definitions
Refer to the example event report in Figure 7.2 to view event report columns.
This example event report displays rows of information each 1/8 cycle and
was retrieved with the EVENT L n command.
The columns contain current, element, input, and output information. The
current columns show currents in primary amperes. The other columns show a
number, letter, or symbol to indicate the condition of the elements, inputs, and
outputs.
Current Columns
The current columns show sampled current (after filtering) in primary
amperes. The columns are shown in Table 7.2.
Note that the current values change from plus to minus (–) values in
Figure 7.2, indicating the sinusoidal nature of the waveforms.
Other figures help in understanding the information available in the event
report current columns:
Figure 7.3 shows how event report current column data relate to the actual
sampled current waveform and rms current values.
Figure 7.4 shows how event report current column data can be converted
to phasor rms current values.
Table 7.2 Standard Event Report Current Columns
Column Heading Definition
IA
Current measured by channel IA
IB
Current measured by channel IB
IC
Current measured by channel IC
IN
Current measured by channel IN
IG
Calculated residual current (calculated from channels IA, IB,
and IC; IG = IA + IB + IC, vectorially added together)