User manual for single-phase meter
11
7 Demand
7.1 Calculation method of MD
Demand: The average value of power over a specified time interval.
Max. Demand (MD) in current month: Max value of final demand average value in
Current month.
Accumulating MD: MD accumulating value of each month.
Integrating period: MD period* Numbers of MD period
MD accumulation and calculation start after integral minute of initial power-on of meter.
The meter supports two different methods for demand calculation:
• Slide interval
• Block interval
An interval is the time over which demand is calculated. The length of a demand interval is
programmable by software.
An interval is the time over which demand is calculated. The length of a demand interval is
programmable by software, but the value must not exceed 60 minutes. Common demand interval
lengths are 15 or 30 minutes.
①Slide interval.
Slide demand interval is defined by two parameters:
•The demand interval length - specified in minutes and may be any value that is evenly
divisible into 60.
•Subinterval length - also specified in minutes and may be any value that is evenly divisible
into the interval length
Both of these values are configurable by Hexing meter support software. The demand is
calculated at the end of each subinterval, resulting in overlapping demand intervals.
For example, the meter can be configured for a 15-minute demand interval length and a 5-
minute subinterval length. In this case, the demand is calculated every 5 minutes, and result in 15
minutes.
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