Schweitzer Engineering Laboratories SEL-351A - Table 12.2 Standard Event Report Current, Voltage, and Frequency Columns

12.9
Date Code 20080213 Instruction Manual SEL-351A Relay
Standard Event Reports and SER
Standard 15/30-Cycle Event Reports
➤ Optoisolated input contact bounce on channels IN101–IN106
NOTE: VDC is not available in the
SEL-351A-1.
➤ Transients on the station dc battery channel Vdc (power input
terminals Z25 and Z26)
The filters for ac current and voltage and station battery are fixed. You can
adjust the optoisolated input debounce via debounce settings (see Figure 7.1).
Raw event reports display one extra cycle of data at the beginning of the
report.
Unfiltered Event Reports With PTCONN = DELTA
When global setting PTCONN = DELTA, the raw event report voltage
columns reflect the signals applied to relay terminals VA-N, VB-N, VC-N, even
though the relay is configured for an open-delta PT connection (see
Figure 2.24). If the relay is properly wired, the value shown in column
VB
should be at or near 0 kV, because input terminal VB is tied to terminal N.
Column
VA should reflect power system voltage V
AB
, and column VC should
reflect power system voltage V
CB
(or –V
BC
).
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 12.3 to view event report columns
This example event report displays rows of information each 1/4 cycle and
was retrieved with the EVE command.
The columns contain ac current, ac voltage, station dc battery voltage,
frequency, output, input, and protection and control element information.
NOTE: Figure 12.3 is on multiple
pages.
Current, Voltage, and Frequency Columns
Table 12.2 summarizes the event report current, voltage, and frequency
columns.
Table 12.2 Standard Event Report Current, Voltage, and Frequency Columns
(Sheet 1 of 2)
Column
Heading
Definition
IA
Current measured by channel IA (primary A)
IB
Current measured by channel IB (primary A)
IC
Current measured by channel IC (primary A)
IN
Current measured by channel IN (primary A)
IG
Calculated residual current IG = 3I
0
= IA + IB + IC (primary A)
VA
Voltage measured by channel VA (primary kV, PTCONN = WYE)
a
VB
Voltage measured by channel VB (primary kV, PTCONN = WYE)
a
VC
Voltage measured by channel VC (primary kV, PTCONN = WYE)
a
VAB
Power system phase-to-phase voltage V
AB
(primary kV, PTCONN = DELTA)
b
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