Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

Page: 354 / 706

8.34
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Breaker Monitor, Metering, and Load Profile Functions
Load Profile Report (Available in Firmware Versions 6 and 7)
Labels are entered into the setting, 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 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. 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.
MWHAO, MWHBO, MWHCO Phase megaWATT hours out (wye-connected only)
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 dis-
play 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