5.11
Date Code 20170927 Instruction Manual SEL-751 Relay
Metering and Monitoring
Metering
The relay provides demand (METER DE command) and peak demand
(METER PE command) metering. Table 5.6 shows the values reported.
Figure 5.12 provides an example of the METER DE (Demand) command
report and Figure 5.13 provides an example of the METER PE (Peak
Demand) command report. Refer to Demand Metering on page 4.153 for
detailed descriptions and settings selection.
Peak demand metering values are stored to nonvolatile memory four times per
day and within one minute of the peak demand metering values being reset.
Demand metering is stored in volatile memory only and the data is lost when
power to the relay is removed.
Ta b l e 5 . 6 Dem an d Va lu e s
Relay Option Demand/Peak Demand Values
All Models Demand/peak demand values of line currents IA, IB, and
IC magnitudes (A primary)
Demand/peak demand value of IG (residual ground cur-
rent) magnitude (A primary)
Demand/peak demand value of negative-sequence current
(3I2) magnitude (A primary)
With AC Phase Voltage
Inputs
Demand/peak demand value of single-phase kilowatts,
kWA, B, C (wye-connected voltage inputs only)
Demand/peak demand value of three-phase kilowatts,
kW3P
Demand/peak demand value if single-phase kilovars
kVARA, B, C (wye-connected voltage inputs only)
Demand/peak demand value of three-phase kilovars,
kVAR3P
=>>MET DE <Enter>
SEL-751 Date: 08/30/2012 Time: 19:43:35.170
FEEDER RELAY Time Source: Internal
IAD IBD ICD IGD 3I2D
DEMAND (A pri.) 1001.9 1009.6 1014.5 19.3 16.2
A B C 3P
DEMAND IN (kW) 0 0 0 0
DEMAND OUT (kW) 843 849 853 2545
DEMAND IN (kVAR) 0 0 0 0
DEMAND OUT (kVAR) 541 546 551 1639
LAST RESET = 08/29/2012 01:10:16
Figure 5.12 MET DE Command Response
=>>MET PE <Enter>
SEL-751 Date: 08/30/2012 Time: 19:43:43.590
FEEDER RELAY Time Source: Internal
IAPD IBPD ICPD IGPD 3I2PD
PEAK DEM (A pri.) 1003.5 1014.1 1016.9 116.2 104.2
A B C 3P
PEAK DEMAND IN (kW) 999 1010 1012 3020
PEAK DEMAND OUT (kW) 845 853 856 2546
PEAK DEMAND IN (kVAR) 80 86 76 226
PEAK DEMAND OUT (kVAR) 543 549 554 1640
LAST RESET = 08/29/2012 01:10:16
Figure 5.13 MET PE Command Response
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