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E154713
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2: Nexus
®
1500+ Meter Overview
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
2.5: Demand Integrators
Power utilities take into account both energy consumption and peak demand when
billing customers. Peak demand, expressed in kilowatts (kW), is the highest level of
demand recorded during a set period of time, called the interval. The Nexus® 1500+
meter supports the following most popular conventions for averaging demand and
peak demand: Block Window Demand, Rolling Window Demand, and Thermal
Demand. You can program and access all conventions concurrently with the Commu-
nicator EXT
TM
4.0 software (see Chapter 11 of the
Communicator EXT
TM
4.0 and
MeterManager EXT Software User Manual
). Note that you can also set TOU demand
intervals for the Nexus® 1500+ meter.
Block (Fixed) Window Demand:
This convention records the average (arithmetic mean) demand for consecutive time
intervals (usually 15 minutes).
Example: A typical setting of 15 minutes produces an average value every 15 minutes
(at 12:00, 12:15. 12:30. etc.) for power reading over the previous fifteen minute
interval (11:45-12:00, 12:00-12:15, 12:15-12:30, etc.).
Rolling (Sliding) Window Demand:
Rolling Window Demand functions like multiple overlapping Block Window Demands.
The programmable settings provided are the number and length of demand subinter-
vals. At every subinterval, an average (arithmetic mean) of power readings over the
subinterval is internally calculated. This new subinterval average is then averaged
(arithmetic mean), with as many previous subinterval averages as programmed, to
produce the Rolling Window Demand.
Example: With settings of 3 five-minute subintervals, subinterval averages are
computed every 5 minutes (12:00, 12:05, 12:10, 12:15, etc.) for power readings
over the previous five-minute interval (11:55-12:00, 12:00-12:05, 12:05-12:10,
12:10-12:15, etc.). Further, every 5 minutes, the subinterval averages are averaged
in groups of 3 (12:00. 12:05, 12:10, 12:15. etc.) to produce a fifteen (5x3) minute
average every 5 minutes (rolling (sliding) every 5 minutes) (11:55-12:10, 12:00-
12:15, etc.).
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