7.11
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Metering
Battery Metering
NOTE: Not all SEL-400 series relays
support synchrophasor
measurements.
When you issue the MET PM time command, the relay captures the time-syn-
chronized data for the given trigger time (specify time in 24-hour format). The
relay displays the synchrophasor data immediately after the time trigger.
The synchrophasor measurements are only valid when a suitable high-accuracy
IRIG-B or PTP time source is connected to the relay, as indicated by Relay Word
bit TSOK = logical 1.
The MET PM command is only available when the relay is configured for phasor
measurement functions (Global settings) and the relay is in high-accuracy time-
keeping mode.
Battery Metering
The relay monitors battery system voltages and records time stamps for voltage
excursions. In addition, the relay records maximum and minimum battery volt-
ages. Figure 7.6 shows a sample dc battery monitor meter report. Use the MET
BAT command from a communications terminal to obtain this report.
Any battery voltage between setting DCLWP and the dc battery monitor low
limit of 15 Vdc is in the L-Zone. Battery voltages in the H-Zone are voltages
higher than the DCHWP setting.
Use the MET RBM command from a communications terminal to reset the dc
battery monitor. You can program a SEL
OGIC control equation RST_BAT (in
Monitor settings) to control dc battery monitor reset.
=>>MET BAT <Enter>
Relay 1 Date: 06/07/2008 Time: 22:51:47.067
Station A Serial Number: 2008030645
Station Battery VDC VDCPO VDCNE VAC
VDC1 (V) 115.86 57.32 -58.54 0.01
VDC1(V) Date Time
Minimum 105.86 04/07/2008 22:43:04.022
Enter L-Zone 04/07/2008 22:40:14.162
Exit L-Zone 04/07/2008 22:44:09.223
Maximum 125.86 04/09/2008 12:34:14.321
Enter H-Zone 04/09/2008 12:31:32.543
Exit H-Zone 04/09/2008 12:35:12.657
LAST DC RESET: 01/15/2008 20:10:31.427
=>>
Figure 7.6 Battery Metering: Terminal
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