Electro Industries Shark 200T Spezifikationen PDF herunterladen (Seite 22)

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1: Three-Phase Power Measurement

As in Table 1.2, the accumulated energy for the power load profile of Figure 1.7 is

14.92 kWh.

Demand is also a time-based value. The demand is the average rate of energy use

over time. The actual label for demand is kilowatt-hours/hour but this is normally

reduced to kilowatts. This makes it easy to confuse demand with power, but demand

is not an instantaneous value. To calculate demand it is necessary to accumulate the

energy readings (as illustrated in Figure 1.7) and adjust the energy reading to an

hourly value that constitutes the demand.

In the example, the accumulated energy is 14.92 kWh. But this measurement was

made over a 15-minute interval. To convert the reading to a demand value, it must be

normalized to a 60-minute interval. If the pattern were repeated for an additional

three 15-minute intervals the total energy would be four times the measured value or

Time

Interval

(minute)

Power

(kW)

Energy

(kWh)

Accumulated

Energy

(kWh)

1 30 0.50 0.50

2 50 0.83 1.33

3 40 0.67 2.00

4 55 0.92 2.92

5 60 1.00 3.92

6 60 1.00 4.92

7 70 1.17 6.09

8 70 1.17 7.26

9 60 1.00 8.26

10 70 1.17 9.43

11 80 1.33 10.76

12 50 0.83 12.42

13 50 0.83 12.42

14 70 1.17 13.59

15 80 1.33 14.92

Table 1.2: Power and Energy Relationship over Time

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 297 298

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Electro Industries Shark 200T Spezifikationen Seite 22