10.12
SEL-751 Relay Instruction Manual Date Code 20170927
Analyzing Events
Event Reporting
Other figures help in understanding the information available in the event
report current columns:
➤ Figure 10.4 shows how event report current column data relate
to the actual sampled current waveform and rms current values.
➤ Figure 10.5 shows how you can convert event report current
column data to phasor rms current values.
Example 15-Cycle Event Report
The following example of a standard 15-cycle event report in Figure 10.3 also
corresponds to the example SER report in Figure 10.17.
In Figure 10.3, an arrow (
>) in the column following the VDC 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 VDC column identifies the row
with the maximum phase current. The SEL-751 calculates maximum phase
current from the row identified with the asterisk and the row one quarter-cycle
previous (see Figure 10.4 and Figure 10.5). 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.
Figure 10.4 and Figure 10.5 look in detail at one cycle of A-phase current
(channel IA) identified in Figure 10.3. Figure 10.4 shows how the event report
ac current column data relate to the actual sampled waveform and rms values.
Figure 10.5 shows how you can convert the event report current column data
to phasor rms values. Voltages processing occurs similarly.
In Figure 10.4, note that you can use any two rows of current data from the
event report in Figure 10.3, 1/4 cycle apart, to calculate rms current values.
=>>EVE <Enter>
SEL-751 Date: 03/11/2015 Time: 14:16:39.043
Date and Time of Event
FEEDER RELAY
Serial Number=000000000000000
FID=SEL-751-X272-V0-Z006002-D20150103 CID=05A2
Firmware and Checksum Identifier
55555 55
a
8 O
11111 00 1 I u
A N n t
Currents (A Pri) Voltages (V Pri) B Q 1 13
a
Replaced with 67 (directional
overcurrent) when setting
EDIR := Y or AUTO
IA IB IC IN IG VAB VBC VCA VS VDC CPNGQ PG 2 2
Optional 2 AVI/4 AFDI Card Required
[1]
-1739 467 1277 -0.0 4.2 -7429 -3317 10679 -7178 48 33... F. . . .3
449 -1735 1256 0.0 -30.0 7994 -10399 2259 8071 48 33... F. . . .3
1741 -468 -1279 0.0 -6.0 7421 3323 -10681 7173 48 33... F. . . .3
-454 1736 -1258 0.0 24.0 -7999 10395 -2255 -8080 48 33... F. . . .3
[2]
-1742 466 1278 -0.0 1.8 -7418 -3332 10679 -7171 48 33... F. . . .3
454 -1737 1258 -0.0 -25.2 7999 -10397 2246 8084 48 33... F. . . .3
1738 -465 -1283 0.0 -10.2 7412 3334 -10685 7162 48 33... F. . . .3
-456 1736 -1259 0.0 20.4 -8006 10391 -2243 -8087 48 33... F. . . .3
One Cycle of Data
[3]
-1737 461 1283 0.0 7.2 -7409 -3341 10685 -7160 48 33... F. . . .3
455 -1737 1258 -0.0 -24.0 8010 -10393 2236 8089 48 33... F. . . .3
1735 -460 -1284 -0.0 -9.6 7402 3346 -10688 7153 48 33... F. . . .3
-456 1736 -1259 0.0 20.4 -8015 10388 -2232 -8095 48 33... F. . . .3
Figure 10.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution
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