8.35
Date Code 20080103 Instruction Manual SEL-351S Relay
Breaker Monitor, Metering, and Load Profile Functions
Load Profile Report (Available in Firmware Versions 6 and 7)
Labels are entered into the setting as either comma or space delimited, but are
displayed as comma 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 nonvolatile 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 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 relay is able to store at least 13
days of data at a LDAR of five minutes, if all 15 values are used. If less than
15 values are specified, the relay will be able to store more days of data before
data over-write occurs. Likewise, if the interval is set longer, the relay will be
able to store more days of data before data over-write 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.
MWH3O Three-phase megaWATT hours out
MVRHAI, MVRHBI, MVRHCI Phase megaVAR hours in (wye connected only)
MVRH3I Three-phase megaVAR hours in
MVRHAO, MVRHBO,
MVRHCO
Phase megaVAR hours out (wye connected only)
MVRH3O Three-phase megaVAR hours out
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.
Label Quantity Recorded
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