Sel 751A - Math Variable Metering; Figure 5.6 Device Response to the METER M Command; Figure 5.7 Device Response to the METER RM Command; Figure 5.8 Device Response to the METER MV Command

5.7
Date Code 20100129 Instruction Manual SEL-751A Relay
Metering and Monitoring
Metering
Figure 5.6 shows an example device response to the METER M command.
=>>MET M <Enter>
SEL-751A Date: 12/02/2008 Time: 15:46:02
FEEDER RELAY Time Source: External
MAX DATE TIME MIN DATE TIME
IA (A) 1005.8 12/02/2008 15:41:43 19.8 11/09/2008 03:55:41
IB (A) 1097.1 12/02/2008 15:41:26 197.3 11/16/2008 11:41:10
IC (A) 972.7 12/02/2008 15:45:11 206.0 11/16/2008 11:40:47
IN (A) 0.5 11/11/2008 18:20:00 0.4 11/16/2008 11:39:43
IG (A) 155.9 12/02/2008 15:42:32 0.4 11/12/2008 00:31:39
VAB (V) 6650.4 12/02/2008 15:45:45 6647.4 12/02/2008 15:41:14
VBC (V) 6671.9 12/02/2008 15:42:56 6666.8 12/02/2008 15:39:54
VCA (V) 7505.1 12/02/2008 15:41:05 7502.9 12/02/2008 15:45:42
VS (V) 6741.4 12/02/2008 15:45:11 6647.4 12/02/2008 15:41:14
KW3P (kW) 7797.2 11/11/2008 13:45:15 -11108 12/02/2008 15:41:42
KVAR3P (kVAR) 5031.8 12/02/2008 15:42:49 -1396.3 12/02/2008 15:45:24
KVA3P (kVA) 12187 12/02/2008 15:41:42 608.1 11/16/2008 11:42:27
FREQ (Hz) 60.1 11/16/2008 11:36:54 60.0 12/02/2008 15:45:23
LAST RESET = 11/09/2008 03:54:34
=>>
Figure 5.6 Device Response to the METER M Command
To reset maximum/minimum meter values, issue the METER RM command
as shown in Figure 5.7. The max/min meter values can be reset from the serial
port, Modbus, the front panel, or assertion of the RSTMXMN relay element.
The date and time of the reset are preserved and shown in the max/min meter
report.
=>>MET RM <Enter>
Reset Metering Quantities (Y,N)? Y <Enter>
Reset Complete
=>>
Figure 5.7 Device Response to the METER RM Command
All maximum and minimum metering values are stored to nonvolatile
memory four times per day and within one minute of the maximum and
minimum metering values being reset.
Math Variable
Metering
The SEL-751A includes 32 math variables. When you receive your
SEL-751A, no math variables are enabled. To use math variables, enable the
number of math variables (between 1 and 32) you require, using the EMV
setting in the Logic setting category. Figure 5.8 shows the device response to
the METER MV M(ath) V(ariable) command with 8 of the 32 math variables
enabled.
=>>MET MV <Enter>
SEL-751A Date: 04/17/2007 Time: 12:32:10
FEEDER RELAY Time Source: Internal
MV01 1.00
MV02 -32767.00
MV03 -1.00
MV04 0.00
MV05 1000.59
MV06 -1000.61
MV07 2411.01
MV08 2410.99
=>>
Figure 5.8 Device Response to the METER MV Command