Sel 751A - Example 15-Cycle Event Report

9.9
Date Code 20100129 Instruction Manual SEL-751A Relay
Analyzing Events
Event Reporting
Note that the ac values change from plus to minus (–) values in Figure 9.3,
indicating the sinusoidal nature of the waveforms.
Other figures help in understanding the information available in the event
report current columns:
➤ Figure 9.4 shows how event report current column data relate
to the actual sampled current waveform and rms current values.
➤ Figure 9.5 shows how event report current column data can be
converted to phasor rms current values.
Example 15-Cycle
Event Report
The following example of a standard 15-cycle event report in Figure 9.3 also
corresponds to the example SER report in Figure 9.6.
In Figure 9.3, an arrow (
>) in the column following the VCA column would
identify the “trigger” row. This is the row that corresponds to the
Date and
Time values at the top of the event report.
The asterisk (
*) in the column following the DC column identifies the row with
the maximum phase current. The maximum phase current is calculated from
the row identified with the asterisk and the row one quarter-cycle previous
(see Figure 9.4 and Figure 9.5). These currents are listed at the end of the
event report in the event summary. If the trigger row (
>) and the maximum
phase current row (
*) are the same row, the * symbol takes precedence.
RTD Oth (SEL-2600
RTD Module or RTD
card required)
a
o
O
OTHALRM AND NOT OTHTRIP
OTHTRIP
RTD Amb (SEL-2600
RTD Module or RTD
card required)
a
a
A
AMBALRM AND NOT AMBTRIP
AMBTRIP
RTD In
a
1
RTDIN
In 12
1
2
b
IN101 AND NOT IN102
NOT IN101 AND IN102
IN101 AND IN102
Out 12
1
2
b
OUT101 AND NOT OUT102
NOT OUT101 AND OUT102
OUT101 AND OUT102
Out 3
3
OUT103
a
These quantities are not displayed when the relay has the voltage card option with VS (sync
voltage) and VDC (battery voltage) inputs.
Table 9.3 Output, Input, Protection, and Control Element Event Report
Columns (Sheet 2 of 2)
Column Heading
Column
Symbols
Description