Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-31
SEL-351 Instruction Manual
Note: In the DELTA version of the relay, the per-phase energy and power values (both
instantaneous and demand) and 3V0 will not be available. Also the per-phase voltages are
replaced with phase-to-phase voltages (i.e., VAB, VBC, and VCA).
Labels are entered into the setting, either comma or space delimited, but are displayed as space
delimited. Load profiling is disabled if the LDLIST setting is empty (i.e., set to NA or 0), which is
displayed as LDLIST = 0. The load buffer is stored in non-volatile memory and the acquisition is
synchronized to the time of day, with a resolution of ±5 seconds. Changing the LDAR setting may
result in up to two acquisition intervals before resynchronization occurs. If the LDAR setting is
increased, the next acquisition time does not have a complete interval, therefore, no record is saved
until the second acquisition time, which is a complete cycle. When the buffer fills up, newer
records overwrite older records. The SEL-351 is able to store at least 13 days of data at an LDAR
of 5 minutes, if all 15 values are used (some units manufactured prior to 1998 have a reduced
memory capacity). If less than 15 values are specified, the SEL-351 will be able to store more
days of data before data overwrite occurs. Likewise, if the interval is set longer, the SEL-351 will
be able to store more days of data before data overwrite occurs.
The load profile report is retrieved via the LDP command, which has the following format:
LDP [a] [b]
If the command is entered without parameters (i.e., LDP), the relay displays all records in the load
buffer. If the command is entered with a single numeric parameter [a] (i.e., LDP 10), the relay
displays the most recent [a] records in the buffer. If the command is entered with two numeric
parameters [a] [b] (i.e., LDP 10 20), the relay displays load buffer records [a] through [b]. If the
command is entered with a single data parameter [a] (i.e., LDP 7/7/96), the relay displays all load
buffer records for the specified date. If the command is entered with two date parameters [a] [b]
(i.e., LDP 7/7/96 8/8/96), the relay displays all load records occurring from date [a] through date
[b] inclusive.
Example LDP
Serial Port
Commands Format
LDP If LDP is entered with no numbers following it, all available rows are
displayed. They display with the oldest row at the beginning (top) of the
report and the latest row (row 1) at the end (bottom) of the report.
Chronological progression through the report is down the page and in
descending row number.
LDP 17 If LDP is entered with a single number following it (17 in this example),
the first 17 rows are displayed, if they exist. They display with the oldest
row (row 17) at the beginning (top) of the report and the latest row (row
1) at the end (bottom) of the report. Chronological progression through
the report is down the page and in descending row number.
LDP 10 33 If LDP is entered with two numbers following it (10 and 33 in this
example; 10 < 33), all the rows between (and including) rows 10 and 33
are displayed, if they exist. They display with the oldest row (row 33) at
the beginning (top) of the report and the latest row (row 10) at the end
Courtesy of NationalSwitchgear.com
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