5.11
Date Code 20100129 Instruction Manual SEL-751A Relay
Metering and Monitoring
Load Profiling
Load Profiling
The SEL-751A includes a load profiling function. The relay automatically
records selected quantities into nonvolatile memory every 5, 10, 15, 30, or 60
minutes, depending on the LDAR load profile report setting (see Load Profile
Settings on page 4.124). Choose which analog quantities you want to monitor
from the analog quantities listed in Appendix K: Analog Quantities. Set these
quantities into the LDLIST load profile list report setting.
The relay memory can hold data for 4,000 time-stamped entries. For example,
if you chose to monitor 10 values at a rate of every 15 minutes, you could
store 41.67 days worth of data.
Download the load rate profile data using the serial port LDP command
described in LDP Command (Load Profile Report) on page 7.30. Figure 5.14
shows an example LDP serial port command response.
=>LDP <Enter>
SEL-751A Date: 02/21/2007 Time: 13:07:02
FEEDER RELAY Time Source: Internal
# DATE TIME IAV VAVE P PF
20 02/21/2007 11:31:24.468 277.636 13823.97 5908.951 0.889
19 02/21/2007 11:36:24.301 278.050 13824.34 5920.197 0.889
18 02/21/2007 11:41:24.035 278.012 13819.86 5920.606 0.890
17 02/21/2007 11:46:24.623 277.661 13824.90 5912.636 0.889
16 02/21/2007 11:51:24.885 278.072 13821.30 5922.041 0.890
15 02/21/2007 11:56:23.873 277.917 13821.33 5914.892 0.889
14 02/21/2007 12:01:23.923 277.630 13821.01 5907.527 0.889
13 02/21/2007 12:06:24.010 278.048 13821.97 5917.934 0.889
12 02/21/2007 12:11:24.140 277.988 13824.35 5917.830 0.889
11 02/21/2007 12:16:24.290 277.780 13820.97 5918.148 0.890
10 02/21/2007 12:21:24.203 277.740 13819.82 5920.595 0.891
9 02/21/2007 12:26:24.507 277.256 13823.17 5907.525 0.890
8 02/21/2007 12:31:24.332 277.973 13822.21 5921.495 0.890
7 02/21/2007 12:36:24.541 277.740 13819.83 5916.932 0.890
6 02/21/2007 12:41:24.791 288.393 13819.60 6593.658 0.955
5 02/21/2007 12:46:24.720 288.589 13820.86 6844.973 0.991
4 02/21/2007 12:51:23.816 288.547 13822.20 6843.819 0.991
3 02/21/2007 12:56:24.174 288.246 13821.41 6838.310 0.991
2 02/21/2007 13:01:24.750 288.232 13823.61 6835.954 0.991
1 02/21/2007 13:06:24.658 288.709 13820.80 6847.213 0.991
=>
Figure 5.14 Device Response to the LDP Command
Station DC Battery Monitor
The station dc battery monitor in the SEL-751A can alarm for under- or
overvoltage dc battery conditions and give a view of how much the station dc
battery voltage dips when tripping, closing, and other dc control functions
take place. The monitor function is available with the enhanced voltage option
with monitoring package that includes the 5AVI card in slot E of the relay. The
monitor measures the station dc battery voltage applied to the rear-panel
terminals labeled E7 (VBAT+) and E8 (VBAT-). The station dc battery
monitor settings (DCLOP and DCHIP) are available via the SET G command
(see Table 5.8 and Global Settings (SET G Command) on page SET.25).
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