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IM02601001E
9-9
Functions on the Web Server Pages
Demand
Demand is the power consumption at the receiving terminal averaged over a specific in
-
terval of time. The Power Xpert Meter is capable of measuring demand by two methods,
fixed (
Block
) or sliding (
Rolling
), in intervals of 5 to 60 minutes. These measurements
are performed for the Total Current, kW Forward/Reverse, Net and Sum; kVar Lead/Lag,
Net and Sum and kVA.
Fixed and Sliding Demand
Fixed demand (
Total Current
), which is an average system current over time can be set
to average current over a range of 5, 15, 30 or 60 minutes. This is known as a fixed win
-
dow. For example, setting the current demand window to 15 sets the meter to determine
the average current over the past 15 minutes and update the value every 15 minutes.
Power demand can be fixed, as described above, or sliding. For example, a 15 minute
average can be obtained that is updated every 5 minutes. To accomplish this, the
Sub-
interval
is set to 5 minutes and the
Total Interval
is set to 15.
Note:
The
Total Interval
is the number of minutes in the average calculation. The subin-
terval is the number of minutes between updates.
The Power Xpert Meter starts the demand window on meter startup.
demand Profile
demand Profile
is the magnitude and duration of loads applied in a prescribed time
sequence, including the transient and steady-state characteristics of the individual loads.
The Power Xpert
®
Meter logs demand profile data from the following sources:
kWh/kW: Forward, Reverse, Net, Sum,
•
kVAh/kVA - kVARh/kVAR: Received, Delivered, Net, Sum, Total Current in Amperes,
•
Phase Currents.
You can set the interval (in lengths of 5 to 60 minutes), sub-interval (used if
Sliding
is se-
lected), and the demand type (
Fixed
or
Sliding
) in the
Demand
page under
Setup
. The
interval duration for the monthly profile is 15 minutes, it is not user programmable.
For the
Demand
Profile
, you can select a date from the drop down list and then click
Show Profile
to change the graph to reflect data from a different day.
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Страница 35: ...23 Instruction Manual IM01500001E Effective July 2011 Pow R Line switchboards eaton corporation www eaton com ...
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