Doc# E145701 1-11
1: Three-Phase Power Measurement
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
59.68 kWh. The same process is applied to calculate the 15-minute demand value.
The demand value associated with the example load is 59.68 kWh/hr or 59.68 kWd.
Note that the peak instantaneous value of power is 80 kW, significantly more than the
demand value.
Figure 1.8 shows another example of energy and demand. In this case, each bar
represents the energy consumed in a 15-minute interval. The energy use in each
interval typically falls between 50 and 70 kWh. However, during two intervals the
energy rises sharply and peaks at 100 kWh in interval number 7. This peak of usage
will result in setting a high demand reading. For each interval shown the demand
value would be four times the indicated energy reading. So interval 1 would have an
associated demand of 240 kWh/hr. Interval 7 will have a demand value of 400 kWh/
hr. In the data shown, this is the peak demand value and would be the number that
would set the demand charge on the utility bill.
Figure 1.8: Energy Use and Demand
As can be seen from this example, it is important to recognize the relationships
between power, energy and demand in order to control loads effectively or to monitor
use correctly.
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Intervals (15 mins.)
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