Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-29
SEL-351 Instruction Manual
Via Front Panel
The information and reset functions available via the previously discussed serial port commands
MET E and MET RE are also available via the front-panel METER pushbutton. See Figure 11.2
in Section 11: Front-Panel Interface.
Energy Metering Updating and Storage
The SEL-351 Relay updates energy values approximately every 2 seconds.
The relay stores energy values to nonvolatile storage once per day (it overwrites the previous stored
value). Should the relay lose control power, it will restore the energy values saved by the relay at
23:50 hours on the previous day.
MAXIMUM/MINIMUM METERING
View or Reset Maximum/Minimum Metering Information
Via Serial Port
See MET Command (Metering Data), MET M – Maximum/Minimum Metering in Section 10:
Serial Port Communications and Commands. The MET M command displays
maximum/minimum metering for the following values:
Currents I
A,B,C,N
Input currents (A primary)
I
G
Residual ground current (A primary; IG = 3I0 = IA + IB + IC)
Voltages V
A,B,C
Input voltages (kV primary; wye-connected voltages only)
V
AB
,
BC
,
CA
Input voltages (kV primary; delta-connected voltages only)
V
S
Input voltage (kV primary)
Power MW
3P
Three-phase megawatts
MVAR
3P
Three-phase megavars
The MET RM command resets the maximum/minimum metering values.
Via Front Panel
The information and reset functions available via the previously discussed serial port commands
MET M and MET RM are also available via the front-panel METER pushbutton. See
Figure 11.2 in Section 11: Front-Panel Interface.
Maximum/Minimum Metering Updating and Storage
The SEL-351 Relay updates maximum/minimum values, if the following conditions are met:
• SELOGIC Control Equation setting FAULT is deasserted (= logical 0).
[The factory default setting is set with time-overcurrent element pickups:
FAULT = 51P + 51G
Courtesy of NationalSwitchgear.com
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