9.8
SEL-787 Relay Instruction Manual Date Code 20150130
Analyzing Events
Event Reporting
Table 9.2 summarizes the analog event report columns.
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 analog event report current column data
relate to the actual sampled current waveform and rms current
values.
➤ Figure 9.5 shows how analog event report current column data
can be converted to phasor rms current values.
Example 15-Cycle
Event Report
The following example of a standard analog 15-cycle event report in
Figure 9.3 also corresponds to the example SER report in Figure 9.8.
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 VCA 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
Table 9.2 Analog Event Report Columns Definitions
Column
Heading
Column
Symbols
Description
IAW1
Current measured by channel IA, Winding 1 (primary A)
IBW1
Current measured by channel IB, Winding 1 (primary A)
ICW1
Current measured by channel IC, Winding 1 (primary A)
IGW1
Residual current (IAW1 + IBW1 + ICW1, primary A),
displayed only when no voltages are shown
IAW2
Current measured by channel IA, Winding 2 (primary A)
IBW2
Current measured by channel IB, Winding 2 (primary A)
ICW2
Current measured by channel IC, Winding 2 (primary A)
IGW2
Residual current (IAW2 + IBW2 + ICW2, primary A),
displayed only when no voltages are shown
IN
Current measured by channel IN (primary A) when neutral
CT is present
VAN or VAB Voltage measured by channel VAN or VAB (primary V),
requires voltage input
VBN or VBC Voltage measured by channel VBN or VBC (primary V),
requires voltage input
VCN or VCA Voltage measured by channel VCN or VCA calculated from
VAB and VBC (primary V), requires voltage input
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
To Next Page
Loading...
