Sel SEL-787 - Figure 5.10 METER RMS Command Report; Figure 5.11 METER AI Command Report

5.9
Date Code 20150130 Instruction Manual SEL-787 Relay
Metering and Monitoring
Metering
Analog Input
Metering
The SEL-787 can monitor analog (transducer) quantities that it is measuring if
equipped with optional analog inputs. Analog input metering shows
transducer values from standard voltage and current transducers. These values
can then be used for monitoring automation and control applications.
Through the global settings, you can set each type of analog input to the type
of transducer that drives that analog input. You also set the range of the
transducer output. Analog inputs can accept both current and voltage
transducer outputs. Ranges for the current transducers are ±20 mA and ranges
for the voltage transducers are ±10 V. You also set the corresponding output of
the analog inputs in engineering units. See Section 4: Protection and Logic
Functions for an explanation of how to set up analog inputs for reading
transducers. Figure 5.11 shows an example of analog input metering.
Demand Metering
The SEL-787 offers the choice between two types of demand metering,
settable with the enable setting:
EDEM = THM (Thermal Demand Metering)
or
EDEM = ROL (Rolling Demand Metering)
The relay provides demand (METER DE command) and peak demand
(METER PE command) metering for the winding selected (Winding 1 or
Winding 2). Table 5.7 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 4.62 for detailed descriptions and settings
selection.
=>MET RMS <Enter>
SEL-787 Date: 01/23/2008 Time: 13:44:57
TRNSFRMR RELAY Time Source: Internal
IAW1 IBW1 ICW1
RMS (A pri.) 118.0 122.5 120.7
IAW2 IBW2 ICW2
RMS (A pri.) 2351.7 2461.3 2401.1
IN
RMS (A pri.) 146.6
VAB VBC VCA
RMS (V pri.) 12090 11893 21180
=>
Figure 5.10 METER RMS Command Report
=>MET AI <Enter>
SEL-787 Date: 01/23/2008 Time: 13:44:44
TRNSFRMR RELAY Time Source: Internal
Input Card 3
AI301 (mA) -0.008
AI302 (mA) -0.007
AI303 (mA) -0.001
AI304 (mA) -0.006
=>
Figure 5.11 METER AI Command Report