5.6
SEL-751 Relay Instruction Manual Date Code 20170927
Metering and Monitoring
Metering
Figure 5.3 provides an example of the METER T command report.
Energy Metering
The SEL-751 includes energy metering in models with AC voltage inputs. Use
this form of metering to quantify real, reactive, and apparent energy supplied
to the feeder load. Following are the energy meter values.
➤ MWh3P-OUT—Real three-phase energy (out of bus,
into feeder)
➤ MWh3P-IN—Real three-phase energy (from feeder into bus)
➤ MVARh3P-OUT—Reactive three-phase energy (out of bus,
into feeder)
➤ MVARh3P-IN—Reactive three-phase energy (from feeder,
into bus)
➤ MVAh3P—Apparent three-phase energy
➤ Last date and time of energy meter quantities were reset
Ta b l e 5 . 3 RTD I n p u t S t a tu s M e s s a ge s
Message Status
Open RTD leads open
Short RTD leads shorted
Comm Fail Fiber-optic communications to SEL-2600 RTD Module have failed
Stat Fail SEL-2600 RTD Module self-test status failure
=>>MET T <Enter>
SEL-751 Date: 07/06/2015 Time: 16:09:00.847
FEEDER RELAY Time Source: Internal
Max Winding RTD NA
Max Bearing RTD NA
Ambient RTD 75 C
Max Other RTD 70 C
RTD 1 OTH 20 C
RTD 2 OTH 25 C
RTD 3 OTH 30 C
RTD 4 OTH 35 C
RTD 5 OTH 38 C
RTD 6 OTH 45 C
RTD 7 OTH 50 C
RTD 8 OTH 55 C
RTD 9 OTH 60 C
RTD 10 OTH 65 C
RTD 11 OTH 70 C
RTD 12 AMB 75 C
Thermal Element 1 Current (pu) 0.404
Thermal Element 1 TCU (%) 0.5
Thermal Element 1 Trip Time (sec) 9999
Thermal Element 1 Release Time (sec) 9999
Thermal Element 2 Current (pu) 0.396
Thermal Element 2 TCU (%) 2.6
Thermal Element 2 Trip Time (sec) 9999
Thermal Element 2 Release Time (sec) 58
Thermal Element 3 Current (pu) 0.399
Thermal Element 3 TCU (%) 0.4
Thermal Element 3 Trip Time (sec) 9999
Thermal Element 3 Release Time (sec) 9999
=>>
Figure 5.3 METER T Command Report With RTDs
NOTE: The maximum time to
thermal trip is 3600 seconds (values
greater than this are displayed as
9999 seconds).
NOTE: Energy values rollover after
99999.999 MVAh and reset to 0.
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