5.15
Date Code 20170927 Instruction Manual SEL-751 Relay
Metering and Monitoring
Station DC Battery Monitor
Station DC Battery Monitor
The station dc battery monitor in the SEL-751 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 voltage/arc-flash
detection 2 AVI/4 AFDI card option in slot E of the relay. The monitor
measures the station dc battery voltage applied to the rear-panel terminals
labeled E3 (VBAT+) and E4 (VBAT–). The station dc battery monitor settings
(DCLOP and DCHIP) are available via the SET G command (see Tabl e 5 .9
and Global Settings (SET G Command) on page SET.31).
DC Under- and
Overvoltage
Elements
Refer to Figure 5.17. The station dc battery monitor compares the measured
station battery voltage (Vdc) to the undervoltage (low) and overvoltage (high)
pickups DCLOP and DCHIP. The setting range for pickup settings DCLOP
and DCHIP is:
20 to 300 Vdc, 0.01Vdc increments
This range allows the SEL-751 to monitor nominal battery voltages of 24, 48,
110, 125, 220, and 250V. When testing the pickup settings DCLOP and
DCHIP, do not operate the SEL-751 outside of its power supply limits. See
Specifications: General on page 1.13 for the various power supply
specifications. The power supply rating is located on the serial number sticker
on the relay side panel.
=>LDP <Enter>
SEL-751 Date: 02/21/2011 Time: 13:07:02
FEEDER RELAY Time Source: Internal
# DATE TIME IAV VAVE P PF
20 02/21/2011 11:31:24.468 277.636 13823.97 5908.951 0.889
19 02/21/2011 11:36:24.301 278.050 13824.34 5920.197 0.889
18 02/21/2011 11:41:24.035 278.012 13819.86 5920.606 0.890
17 02/21/2011 11:46:24.623 277.661 13824.90 5912.636 0.889
16 02/21/2011 11:51:24.885 278.072 13821.30 5922.041 0.890
15 02/21/2011 11:56:23.873 277.917 13821.33 5914.892 0.889
14 02/21/2011 12:01:23.923 277.630 13821.01 5907.527 0.889
13 02/21/2011 12:06:24.010 278.048 13821.97 5917.934 0.889
12 02/21/2011 12:11:24.140 277.988 13824.35 5917.830 0.889
11 02/21/2011 12:16:24.290 277.780 13820.97 5918.148 0.890
10 02/21/2011 12:21:24.203 277.740 13819.82 5920.595 0.891
9 02/21/2011 12:26:24.507 277.256 13823.17 5907.525 0.890
8 02/21/2011 12:31:24.332 277.973 13822.21 5921.495 0.890
7 02/21/2011 12:36:24.541 277.740 13819.83 5916.932 0.890
6 02/21/2011 12:41:24.791 288.393 13819.60 6593.658 0.955
5 02/21/2011 12:46:24.720 288.589 13820.86 6844.973 0.991
4 02/21/2011 12:51:23.816 288.547 13822.20 6843.819 0.991
3 02/21/2011 12:56:24.174 288.246 13821.41 6838.310 0.991
2 02/21/2011 13:01:24.750 288.232 13823.61 6835.954 0.991
1 02/21/2011 13:06:24.658 288.709 13820.80 6847.213 0.991
=>
Figure 5.16 LDP Command Response
Table 5.9 Station DC Battery Monitor Settings
Setting Prompt Setting Range
Setting Name :=
Fac to ry Defa ult
DC UNDER VOLT PU (OFF, 20.00-300.00) Vdc DCLOP := OFF
DC OVER VOLT PU (OFF, 20.00-300.00) Vdc DCHIP := OFF
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