December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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265Economical Use of Power
(2) With unity pf in the first shift, the kilovolt-ampere demand will be equal to
the kilowatt, that is, 1000 kVA, while the energy consumption will remain
the same.
Therefore, new monthly utility bill = 12,800 × 30 × 0.15 + 1000 × 15
=$72,600, which is $6000 per month less than before.
Example 10.5
A daily power consumption profile of a customer is shown in the table below,
where the kilowatt loads are averaged over the period listed and kilovolt-ampere
demand meter readings are peak values over 15-min intervals during the period.
This pattern repeats for all days in a 30-day month. The utility tariff to this con ...
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