December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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10
Economical Use of Power
The economical use of power in this chapter means doing the same required work with
a minimum expense of energy. Major opportunities in energy savings come from
• Using a high-efciency motor that runs several hours every day over the
year
• Improving the power factor of the equipment or the entire plant to bring it
close to unity
• Using variable-frequency drive to match the motor speed with the load
requirement
• Storing energy when it is available at lower cost and using it later when it
has a higher value
• Converting the kinetic energy of moving mass into electricity when braking,
called regenerative braking ...
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