P.3.314
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
87L Channel Recorder
To help SEL in troubleshooting channel issues, the relay includes a channel
recorder. Channel records contain 80 ms of pretrigger data and 40 ms of post-
trigger data of raw serial data that appeared at the TX and RX terminals of the
relay communications channel(s).
The channel recorder becomes operational once the 87L port setting E87CH is
specified as serial (2SS, 2SD, 3SS, or 3SM). In the case of two-terminal, dual-
channel applications (2SD) both ports are recorded.
When the channel recording is operational, the relay buffers unencoded
transmit and receive binary channel data from each enabled serial channel.
Upon a rising edge of Relay Word bit 87CHTRG, the relay creates files with
the stored data for each enabled channel in the COMMS directory. The
COMMS directory is a separate directory that contains only channel recording
information data files. The relay is capable of storing 150 channel recording
files.
Names of the recording files have the following format:
YYMMDD,HHmmSSsss,0,CHLn,dd.87L
where,
YYMMDD,HHmmSSsss corresponds to the trigger time (UTC).
➤ YY is the last two digits of the year (00–99)
➤ MM is the month (01–12)
➤ DD is the day (01–31)
➤ HH is the hour (00–23)
➤ mm is the minute (00–59)
➤ SS is the second (00–59)
➤ sss is the nearest millisecond
CHLndd represents the channel and direction from which the data were
recorded.
➤ n is the channel (1 or 2)
➤ dd is the direction of the data stream with respect to the local
relay (TX or RX)
Following are examples of the file names for Channel 1 and Channel 2
recording files.
The channel recorder file for Channel 1 in the transmit direction (outgoing
data) is as follows:
120607,212815442,0,CHL1,TX.87L
The channel recorder file for Channel 2 in the receive direction (incoming
data) is as follows:
120607,212815442,0,CHL2,RX.87L
The following is an example of the entry necessary for retrieving the example
Channel 1 recording file for the transmit direction:
FILE READ COMMS 120607,212815442,0,CHL1,TX.87L
The default setting for the 87L channel recorder trigger, 87CHTRG, is set to
87LSP (see 87L Watchdog Monitor for more details). You can add other
triggers, but SEL recommends that you do not remove the 87LSP Relay Word
bit from the trigger equation. The 87LSP Relay Word bit is specifically
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