P.8.8
SEL-411L Relay Protection Manual Date Code 20151029
Oscillography, Events, and SER
Oscillography
Figure 8.3 Sample Oscillogram
Raw Data
Oscillography
Raw data oscillography produces oscillograms that track power system
anomalies that occur outside relay digital filtering. Raw data oscillography
captures data with content ranging from dc to greater than 3.0 kHz; the –3 dB
point of the single-order low-pass analog input filter is 3.0 kHz (with response
rolling off at –20 dB per decade).
COMTRADE files include all eight Relay Word bits from each row of the
Relay Word that has at least one element included in the event report digital
elements setting.
The relay stores high-resolution raw data oscillography in binary format and
uses COMTRADE file types to output these data:
➤ .HDR—header file
➤ .CFG—configuration file
➤ .DAT—high-resolution raw data file
The .HDR file contains summary information about the event in ASCII
format. The .CFG file is an ASCII configuration file that describes the layout
of the .DAT file. The .DAT file is in binary format and contains the values for
each input channel for each sample in the record. These data conform to the
IEEE C37.111-1999 COMTRADE standard.
.HDR File
The .HDR file contains the summary and relay settings information that
appears in the event report for the data capture (see Event Summary Section of
the Event Report and Settings Section of the Event Report). The settings
portion is in a comma-delimited format as illustrated in Figure 8.4.
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