Date Code 20011205
Breaker Monitor and Metering Functions
8-29
SEL-311B 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-311B 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.
M
AXIMUM
/M
INIMUM
M
ETERING
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
I
G
Input currents (A primary)
Residual ground current (A primary; I
G
=3I
0
= I
A
+ I
B
+ I
C
)
Voltages V
A,B,C
V
S
Input voltages (kV primary)
Input voltage (kV primary)
Power MW
3P
MVAR
3P
Three-phase megawatts
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
.
Summary of Contents for SEL-311B
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