5.14
SEL-700G Relay
Instruction Manual
Date Code 20170814
Metering and Monitoring
Load Profiling
Small Signal Cutoff
for Metering
The relay applies a threshold to the voltage and current magnitude metering
quantities to force a reading to zero when the measurement is near zero. The
threshold for fundamental metering current values is 0.01 • INOM A
(secondary) and for voltage values is 0.1 V (secondary). The threshold for
RMS metering current values is 0.03 • INOM A (secondary) and for voltage
values is 0.3 V (secondary).
Load Profiling
The SEL-700G 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 4.237). 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 9800 time-stamped entries. For example,
if you choose to monitor 10 values at a rate of every 15 minutes, you could
store approximately as many as 102 days worth of data.
Download the load rate profile data by using the serial port LDP command
described in LDP Command (Load Profile Report) on page 7.33. Figure 5.16
shows an example LDP serial port command response.
=>>
MET H <Enter>
SEL-700G Date: 02/24/2010 Time: 15:53:02.780
GENERATOR RELAY Time Source: Internal
IAX IBX ICX IAY IBY ICY
Fund (A sec.) 5.05 5.01 5.00 5.01 5.02 5.00
2nd (A sec.) 0.01 0.00 0.00 0.00 0.00 0.00
3rd (A sec.) 0.00 0.01 0.01 0.00 0.00 0.01
4th (A sec.) 0.00 0.00 0.00 0.00 0.00 0.00
5th (A sec.) 0.00 0.01 0.01 0.00 0.00 0.00
THD (%) 0.18 0.29 0.24 0.14 0.15 0.19
=>>
Figure 5.15
METER H (Harmonic) Command Report
=>
LDP <Enter>
SEL-700G Date: 02/24/2010 Time: 16:54:04.464
GENERATOR RELAY Time Source: Internal
# DATE TIME IAX_MAG VAX_MAG P3X PF3X FREQX
10 02/24/2010 16:05:01.651 504.948 9978.167 13021.76 0.866 59.989
9 02/24/2010 16:10:01.706 504.662 9978.728 13024.23 0.866 59.988
8 02/24/2010 16:15:01.673 505.013 9978.229 13020.71 0.867 59.988
7 02/24/2010 16:20:01.681 504.784 9978.532 13022.14 0.867 59.988
6 02/24/2010 16:25:01.694 504.498 9975.058 13024.19 0.867 59.988
5 02/24/2010 16:30:01.298 504.677 9977.791 13025.01 0.867 59.988
4 02/24/2010 16:35:01.448 504.947 9978.691 13020.72 0.866 59.988
3 02/24/2010 16:40:01.248 707.137 9999.430 18255.97 0.867 59.989
2 02/24/2010 16:45:01.369 705.380 9973.406 18257.78 0.867 59.989
1 02/24/2010 16:50:01.661 707.026 9979.489 18257.22 0.867 59.989
=>
Figure 5.16
Device Response to the LDP Command
Summary of Contents for SEL-700G Series
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