7.39
Date Code 20170927 Instruction Manual SEL-751 Relay
Communications
Communications Protocols
IIR filtering process from the short-term histogram. The long-term histogram
therefore adapts to the feeder ambient load conditions and increases the
overall HIF detection security.
IDENTIFICATION Command
Use the ID command (see Table 7.24) to extract device identification codes.
INI HIF Command
The INI HIF command (see Table 7.25) is used to restart the 24 -hour tuning
process used in high-impedance fault detection. This command is only
available when the relay supports HIF detection and EHIF is not set to N. If
you issue the INI HIF commands, the relay prompts,
Initiate HIF 24-
hour tuning (Y/N)?
If you answer Y <Enter>, the relay initiates the tuning
process.
IRIG Command
Use the IRIG command to direct the relay to read the demodulated IRIG-B
time code at the serial port or IRIG-B input (see Table 7.26).
To force the relay to synchronize to IRIG-B, enter the following command:
If the relay successfully synchronizes to IRIG-B, it sends the following header
and access level prompt:
If no IRIG-B code is present at the serial port input or if the code cannot be
read successfully, the relay responds with
IRIG-B DATA ERROR.
Table 7.24 IDENTIFICATION Command
Command Description Access Level
ID Returns a list of device identification codes. 0
Table 7.25 INI HIF Command
Command Description Access Level
INI HIF Initiates the 24 -hour tuning process used in high-
impedance fault detection.
2
Ta b l e 7. 26 I R I Co m m an d
Command Description Access Level
IRIG Forces synchronization of internal control clock to
IRIG-B time-code input.
1
=>IRI <Enter>
SEL-751 Date: 12/10/2010 Time: 08:56:03.190
FEEDER RELAY Time Source: external
=>
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