Schweitzer Engineering SEL-351P - Demand Metering Updating and Storage; Energy Metering; Via Front Panel; Via Serial Port

Date Code 990215 Breaker/Recloser Monitor, Battery System Monitor, 8-29
Metering, and Load Profile Functions
SEL-351P Manual Técnico
View or Reset Demand Metering Information
Via Serial Port
See MET D – Demand Metering in subsection MET Command (Metering Data), in Section 10:
Serial Port Communications and Commands. The MET D command displays demand and
peak demand 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)
3I
2
Negative-sequence current (A primary)
Power MW
A,B,C
Single-phase megawatts (wye-connected voltages only)
MVAR
A,B,C
Single-phase megavars (wye-connected voltages only)
MW
3P
Three-phase megawatts
MVAR
3P
Three-phase megavars
The MET RD command resets the demand metering values. The MET RP command resets the
peak demand metering values.
Via Front Panel
The information and reset functions available via the previously discussed serial port commands
MET D, MET RD, and MET RP are also available via the front-panel METER pushbutton. See
the METER pushbutton in the Pushbutton Primary Functions subsection in the Front-Panel
Interface section of the SEL-351P Quick-Start Installation and User’s Guide.
Demand Metering Updating and Storage
The SEL-351P updates demand values approximately every 2 seconds.
The relay stores peak demand values to nonvolatile storage once per day (it overwrites the
previous stored value if it is exceeded). Should the control completely lose control power or go
into the “sleep” mode, when power is restored, the control will restore the peak demand values
saved at 23:50 hours on the previous day.
Demand metering updating and peak recording is momentarily suspended when SEL
OGIC
Control Equation setting FAULT is asserted (= logical 1). See the explanation for the FAULT
setting in the following Maximum/Minimum Metering subsection.
Energy Metering
View or Reset Energy Metering Information
Via Serial Port
See MET E – Energy Metering in subsection MET Command (Metering Data) in Section 10:
Serial Port Communications and Commands. The MET E command displays accumulated
single- and three-phase megawatt and megavar hours. The MET RE command resets the
accumulated single- and three-phase megawatt and megavar hours.