CET Electric Technology
58
4.2.2
Energy Measurements
The iMeter 6 provides Energy parameters for active energy (kWh), reactive energy (kvarh) and apparent energy
(kVAh) with a resolution of 0.1 and a maximum value of ±1,000,000,000.00. When the maximum value is reached,
the energy registers will automatically roll over to zero. The energy can be reset manually via the Front Panel,
Web Interface or through Communications. Further, the Energy can be preset to user-defined values via the Web
Interface (See
Section 3.2.3.5.3.2 – Energy Preset
) or through Communications (See
Section 5.2
The iMeter 6 provides the following energy measurements:
3-Phase Energy
kWh Import/Export/Net/Total
kWh Import/Export of TOU T1-8
kvarh Import/Export/Net/Total
kvarh Import/Export of TOU T1-8
kvarh of Q1/Q2/Q3/Q4
kVAh Total
kVAh Total of TOU T1-8
Per-Phase Energy
(Phase A/B/C):
kWh Import/Export/Net/Total
kWh of Q1/Q2/Q3/Q4
kvarh Import/Export/Net/Total
kvarh of Q1/Q2/Q3/Q4
kVAh
kVAh of Q1/Q2/Q3/Q4
Table 4-3 Energy Measurement
4.2.3
Interval Energy Measurements
The iMeter 6 provides Interval Energy measurements of kWh Import/Export, kvarh Import/Export and kVAh. The
Interval Energy measurements represent the amount of energy consumed during the last completed interval as
defined by
EN Period
. The Interval Energy measurements can only be retrieved through communications and are
not available on the Front Panel or Web Interface.
The
EN Period
(Interval Energy Period)
setup parameter allows the users to specify the interval for which the
real-time energy consumption should be accumulated. It has a range of 5 to 60 minutes and can be programmed
through the Front Panel, Web Interface or communications. Please note that changing the
EN Period
would clear
the present Interval Energy measurements.
4.2.4
High-speed Measurements
The iMeter 6 provides the following high-speed measurements which are available through communications.
▪
3-Phase Voltage with 1 cycle update rate
▪
3-Phase Current, and Neutral Current (I4) with 1 cycle update rate
▪
3-Phase Power and Power Factor with 1 cycle update rate
4.2.5
Demand Measurements
Demand is defined as the average power consumption over an interval. Predicted Demand is typically used for
pre-alarming and to help users reduce power consumption using a Setpoint to warn that the Demand limit may
be exceeded. The iMeter 6 provides the following setup parameters where * indicates the default value.
Parameter
Definition
Options
Demand
Sync. Mode
SLD
- Internally synchronized to the meter’s real-time clock
SYNC DI
- Externally synchronized to a DI that has been programmed as a
Demand Sync Input by setting the
DI Function
as “
DMD Sync
”.
0= SLD*
1=SYNC DI
Demand
Period
1 to 60 minutes. For example, if the
# of Sliding Windows
is set as 1 and
the
Demand Period
is 15, the demand cycle will be 1×15=15min.
1 to 60 min
Default=15
No. of Sliding
Windows
Number of Sliding Windows.
1* to 15
Self-Read
Time
The
Self-Read Time
allows the user to specify the time and day of the
month for the Peak Demand Self-Read operation. The
Self-Read Time
supports three options:
•
A zero value means that the Self-Read will take place at 00:00 of the first
day of each month.
•
A non-zero value means that the Self-Read will take place at a specific
time and day based on the formula: Self-Read Time = Day * 100 + Hour
where 0 ≤ Hour ≤ 23 and 1 ≤ Day ≤ 28. For example, the value 1512
means that the Self-Read will take place at 12:00pm on the 15th day of
each month.
•
A 0xFFFF value will disable the Self-Read operation and replace it with
manual operation. A manual reset will cause the Peak Demand of
This
Default=0xFFFF
