Schneider Electric 4000 manual Thermal Demand, Minutes for illustration purposes, Interval

Chapter 4—Metering Capabilities	63230-300-212
Demand Readings	April 2001
Thermal Demand	The thermal demand method calculates the demand based on a thermal
	response, which mimics thermal demand meters. The demand calculation
	updates at the end of each interval. You select the demand interval from 1 to
	60 minutes (in 1-minute increments). In Figure 4–4the interval is set to 15
	minutes for illustration purposes.

The interval is a window of time that moves across the timeline.

99%
90%
Loadof%			Last completed
			demand interval
0%				Time
				(minutes)
	15-minute	next
	interval	15-minute
		interval

Calculation updates at the end of each interval

Figure 4–4: Thermal Demand Example

Predicted Demand	The circuit monitor calculates predicted demand for the end of the present
	interval for kW, kVAR, and kVA demand. This prediction takes into account
	the energy consumption thus far within the present (partial) interval and the
	present rate of consumption. The prediction is updated every second.
	Figure 4–5illustrates how a change in load can affect predicted demand for
	the interval.
	Predicted demand is updated every second.

Beginning
of interval
	15-minute interval
Demand for	Partial Interval	Predicted demand if load is
		added during interval,
last completed	Demand	predicted demand increases
interval		to reflect increased demand

Predicted demand if no load added

			Time
1:00	1:06	1:15

Change in Load

Figure 4–5: Predicted Demand Example

60 © 2001 Schneider Electric All Rights Reserved