Sel 2414 - Demand Meter Settings; View or Reset Demand Metering Information; Demand Metering Updating and Storage; Analog Input Metering

5.8
SEL-2414 Transformer Monitor Instruction Manual Date Code 20130214
Metering and Monitoring
Metering
Figure 5.6 Rolling Demand Metering
Demand Meter Settings
View or Reset Demand Metering Information
See METER Command (Metering Data) on page 7.18, MET Demand/Peak
Demand Metering on page 7.20. The MET D command displays demand and
peak demand metering.
The MET RD command resets the demand metering values. The MET RP com-
mand resets the peak demand metering values.
After demand values are reset, if setting EDEM := ROL, there may be a delay of
as many as two times the DMTC setting before the demand values are updated.
Demand Metering Updating and Storage
The SEL-2414 updates demand values approximately every two seconds.
The SEL-2414 stores peak demand values to nonvolatile storage once per day
and overwrites the previous stored value if it is exceeded. Should the controller
lose control power, it will restore the peak demand values saved by the device at
23:50 hours on the previous day.
Analog Input
Metering
The SEL-2414 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 automation and control applications within an industrial plant or
application.
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: Logic Functions for an explanation of how to
set up analog inputs for reading transducers. Figure 5.7 shows an example of
analog input metering.
Step
Current
Input
Rolling
Demand
Meter
Response
(EDEM := ROL)
1.0
1.0
.67
.33
0
0.5
0
DMTC Period
0
5
10
15
Time
(minutes)
0
5
10
15
Time
(minutes)
Table 5.11 Demand Meter Settings and Settings Range
Setting Definition Range
EDEM Demand meter type THM = thermal
ROL = rolling
DMTC Demand meter time constant 5, 10, 15, 30, or 60 minutes