Sel 751A, Instruction Manual

Page: 223 / 640

5.5
Date Code 20100129 Instruction Manual SEL-751A Relay
Metering and Monitoring
Metering
Figure 5.3 provides an example of the METER T command report.
=>
MET T <Enter>
SEL-751A Date: 12/05/2008 Time: 17:24:11
FEEDER RELAY Time Source: External
Max Winding RTD NA
Max Bearing RTD NA
Ambient RTD 52 C
Max Other RTD 41 C
RTD 1 OTH -23 C
RTD 2 OTH 9 C
RTD 3 OTH 41 C
RTD 4 AMB 52 C
=>>
Figure 5.3 METER T Command Report With RTDs
Energy Metering
The SEL-751A with the voltage option includes energy metering. Use this
form of metering to quantify real, reactive, and apparent energy supplied to
the feeder load. Below are the energy meter values.
➤
MWh3P-OUT—Real 3-phase energy (out of bus, into feeder)
➤
MWh3P-IN—Real 3-phase energy (from feeder into bus)
➤
MVARh3P-OUT—Reactive 3-phase energy (out of bus, into
feeder)
➤
MVARh3P-IN—Reactive 3-phase energy (from feeder, into
bus)
➤
MVAh3P—Apparent 3-phase energy
➤
Last date and time of energy meter quantities were reset
Figure 5.4 shows the device response to the METER E command.
=>
MET E <Enter>
SEL-751A Date: 12/01/2008 Time: 15:43:28
FEEDER RELAY Time Source: External
Energy
MWh3P-IN (MWh) 1.325
MWh3P-OUT (MWh) 135.660
MVARh3P-IN (MVArh) 2.231
MVARh3P-OUT (MVArh) 8.627
MVAh3P (MVAh) 135.954
LAST RESET = 11/09/2008 03:54:34
=>
Figure 5.4 Device Response to the METER E Command
Table 5.3 RTD Input Status Messages
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