8.28
SEL-351A Relay Instruction Manual Date Code 20080213
Breaker Monitor and Metering
Energy Metering
Energy Metering
View or Reset Energy
Metering Information
Via Serial Port
See MET Command (Metering Data) on page 10.18 and MET E—Energy
Metering on page 10.22. 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.
Via Front Panel (Only on Models With LCD)
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.
Energy Metering
Updating and Storage
The SEL-351A updates energy values approximately every two seconds.
The relay stores energy values to nonvolatile storage once per day (it
overwrites the previous stored value). Should it lose control power, the relay
will restore the energy values saved by it at 23:50 hours on the previous day.
Accumulated energy metering values function like those in an
electromechanical energy meter. When the energy meter reaches 99999 MWh
or 99999 MVARh, it starts at zero. In firmware versions released prior to
November 2002, the SEL-351A energy meter registered dollar signs ($$) after
reaching the upper metering limit.
NOTE: Single-phase quantities only
available when global setting PTCONN
= WYE.
Courtesy of NationalSwitchgear.com
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