P.8.7
Date Code 20151029 Protection Manual SEL-411L Relay
Oscillography, Events, and SER
Oscillography
Oscillography
The relay features the following types of oscillography:
➤ Raw data oscillography—effective sampling rate as fast as
8000 samples/second
➤ Traveling wave data oscillography—sampling rate of 1.5625
MHz
➤ Event report oscillography from filtered data—either
8 samples/cycle or 4 samples/cycle
➤ Event report oscillography from filtered data—20 settable
analog quantities, with a sampling rate of either 8
samples/cycle or 4 samples/cycle.
Use high-resolution raw data oscillography to view transient conditions in the
power system. You can set the relay to report these high-resolution
oscillograms at 8000 samples/second, 4000 samples/second, 2000
samples/second, and 1000 samples/second effective sampling rates. The high-
resolution raw data and traveling wave data oscillograms are available as files
through the use of Ymodem file transfer and FTP (file transfer protocol) in the
binary COMTRADE file format output (IEEE Standard Common Format for
Transient Data Exchange (COMTRADE) for Power Systems, IEEE
C37.111–1999).
The filtered data oscillograms at 8 samples/cycle and 4 samples/cycle give you
accurate information on the relay protection and automation processing
quantities. The relay outputs 8-samples/cycle and 4-samples/cycle filtered
event reports through a terminal or as files in ASCII format, Compressed
ASCII format, and binary FTP and Ymodem file outputs. Figure 8.3 shows a
sample filtered-data oscillogram.
Table 8.2 Event Report Nonvolatile Storage Capability
Event Report Length
Maximum Number of Stored Reports
8 kHz 4 kHz 2 kHz 1 kHz
0.25 seconds 128 170 203 239
0.50 seconds 71 98 123 149
1.0 seconds 37 54 68 84
3.0 seconds 13 19 24 31
6.0 seconds N/A 9 12 16
9.0 seconds N/A N/A 4 6
12.0 seconds N/A N/A N/A 2
To Next Page
Loading...
