
5.10
SEL-700G Relay
Instruction Manual
Date Code 20170814
Metering and Monitoring
Metering
Analog Input
Metering
The SEL-700G can monitor analog (transducer) quantities that it measures if
it is equipped with optional analog inputs. Analog input metering shows
transducer values from standard voltage and current transducers. These values
can then be used for automation and control applications within an industrial
plant or application.
Through the use of 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-700G 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. Table 5.6 shows the values reported.
Figure 5.12 is an example of the METER DE (Demand) command report,
and Figure 5.13 is an example of the METER PE (Peak Demand) command
report. Refer to Demand Metering on page 4.180 for detailed descriptions and
settings selection.
=>>
MET RMS <Enter>
SEL-700G Date: 02/24/2010 Time: 15:28:59.635
GENERATOR RELAY Time Source: Internal
IAX IBX ICX
RMS (A pri.) 505.1 501.7 498.6
IAY IBY ICY
RMS (A pri.) 500.6 502.7 499.8
VAX VBX VCX
RMS (V pri.) 9977 9980 9984
IN
RMS (A pri.) 1.1
VS
RMS (V pri.) 9972
=>>
Figure 5.10
Device Response to the METER RMS Command
=>
MET AI <Enter>
SEL-700G
Date: 02/24/2010 Time: 16:22:22
GENERATOR RELAY Time Source: Internal
Input Card 4
AI401 (psi) 99.97
AI402 (mA) 2.013
AI403 (Volts) -0.0027
AI404 (ft-lbs) 993
AI405 (HP) 1423
AI406 (mA) 9.013
AI407 (mA) -3.014
AI408 (mA) -0.013
=>
Figure 5.11
Device Response to the METER AI Command
Содержание SEL-700G Series
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