7/23/2019 Utilization is The
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Utilization is the end result of the generation, transmission,
and distribution of electric
power. The energy carried by the transmission and distribution
system is turned into
useful work, light, heat, or a combination of these items at the
utilization point.
Understanding and characterizing the utilization of electric
power is critical for proper
planning and operation of power systems. Improper
characterization of utilization can
result of over or under building of power system facilities and
stressing of system
euipment beyond design capabilities. The term load refers to a
device or collection of
devices that draw energy from the power system. Individual loads
!devices" range from
small light bulbs to large induction motors to arc furnaces. The
term load is often
somewhat arbitrarily applied, at times being used to describe a
specific device, and
other times referring to an entire facility and even being used
to describe the lumped
power reuirements of power system components and connected
utilization devices
downstream of a specific point in large scale system
studies.
# ma$or application of electric energy is in its conversion to
mechanical energy.
%lectromagnetic, or %& devices designed for this purpose are
commonly called
motors. #ctually the machine is the central component of an
integrated system
consisting of the source, controller, motor, and load. 'or
specialized applications, the
system may be, and freuently is, designed as an integrated
whole. &any household
appliances !e.g., a vacuum cleaner" have in one unit, the
controller, the motor, and the
load. (owever, there remain a large number of important
stand)alone applications that
reuire the selection of a proper motor and associated control,
for a particular load. It is
this general issue that is the sub$ect of this section. The
reader is cautioned that there is
no magic bullet to deal with all motor)load applications. *ike
many engineering
problems, there is an artistic, as well as a scientific
dimension to its solution. *ikewise,
each individual application has its own peculiar
characteristics, and reuires significant
e+perience to manage. evertheless, a systematic formulation of
the issues can be
useful to a beginner in this area of design, and even f
