3
phase power is used today for many
applications ranging from the above grain dryer to saw
mills, conveyer belt systems, refrigeration and air
conditioning, etc.
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3 Phase Contents |
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3
Phase Loads
One
of the
most common class of 3
phase load is the 3
phase electric motor. A 3 phase induction motor
has a simple design, inherently high starting torque,
and high efficiency. Such motors are applied in
industry for 3
phase pumps, fans, blowers, compressors, conveyor
drives, and many other types of motor-driven
equipment. There are a lot of benefits to using a 3
phase motor over a 1 phase electric motor. A 3
phase motor is more compact and less costly than a
1-phase motor of the same voltage class and rating;
also 1-phase AC motors above 10 HP (7.5 kW) are not as
efficient and thus not usually manufactured.
Large
air conditioning equipment (for example, most air
conditioning units above 2.5 tons (8.8 kW) cooling
capacity) use 3 phase motors for reasons of economy
and efficiency. Read more about 3
phase power loads below.
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3 Phase Powered Hobart
Dough Mixer - pictured above
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3 Phase Powered
Electric Motor - pictured above
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3 Phase Powered
Milling Machine - pictured above |
3 Phase
Loads
Resistance
heating loads such as electric boilers or space
heating may be connected to 3 phase systems.
Electric lighting may also be similarly connected.
These types of loads do not require the revolving
magnetic field characteristic of 3 phase motors
but take advantage of the higher voltage and power
level usually associated with 3 phase
distribution.
Large
rectifier systems may have 3 phase inputs; the
resulting DC current is easier to filter (smooth) than
the output of a single-phase rectifier. Such 3 phase rectifiers may be used for battery charging,
electrolysis processes such as aluminum production, or
for operation of DC motors.
Another
interesting example of a 3 phase load is the
electric arc furnace used in steel making and in
refining of ores.
In
much of Europe stoves are designed to allow for a 3 phase feed. Usually the individual heating units
are connected between phase and neutral to allow for
connection to a 1 phase supply where this is all
that is available.
3
Phase Loads from 3 Phase Power Generated on 1 Phase
Power
There
are many places and instances where 1 phase power is
all that is available, or where the power company
wants to charge tens, or even hundreds of thousands of
dollars to install and supply 3 phase power.
When this is the case a quality 3
phase generating phase converter can be run on 1
phase to power 3 phase equipment of any type.
Click here to read more about powering
3 phase loads with 3 phase power generated from 1
phase power.
3 Phase
Converters
Often
the advantages of 3 phase motors, and other 3 phase
equipment, make it smart and easily worthwhile to
convert single-phase power to generate 3 phase with a Rotary
Phase Converter. Small
and large customers, such as residential, rural
businesses, or farm properties may not have access to
a 3 phase supply, or may not want to pay for the extra
cost of a 3 phase service, but may still wish to use 3
phase equipment. Such 3
phase converters may also allow the frequency (see
also frequency
converters) to be varied allowing for different
equipment frequency requirements (50Hz, 60Hz, 400Hz,
etc.) and also for motor speed control (VFDs).
Some locomotives are driven by 3-phase motors with 3
phase converters converted from the incoming supply of
either DC or 1 phase AC.
The
two main types of 1 phase to 3 phase converters are Rotary
Phase Converters and Static
Phase Converters. Click here to read more
about 3
phase converters.
Continue And Read About Additional 3 Phase Power
Details:
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