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Construction Of Uninterruptible Power Supply
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As
can be seen in the equations above, power loss can be derived from the
electrical current squared and the resistance of a transmission line.
When the voltage is increased, the current decreases and concurrently
the power loss decreases exponentially; therefore high voltage
transmission reduces power loss. For this reasoning electricity was
generated at power stations and delivered to homes and businesses
through AC power. Alternating current, unlike DC, oscillates between two
voltage values at a specified frequency, and it’s ever changing current
and voltage makes it easy to step up or down the voltage. For high
voltage and long distance transmission situations, all that is needed to
step up or down the voltage of the transformer. Developed in 1886 by
William Stanley Jr., the transformer made long distance electrical
transmission using AC power possible.
Electrical transmission has
therefore been mainly based upon AC power, supplying most Nigerian homes
with a 220 volt AC source. It should be noted that since 1954 there
have been many high voltage DC transmission systems implemented around
the globe with the advent of DC/DC converters, allowing the easy
stepping up and down of DC voltages. Like DC power, there exist many
devices such as power tools, radios and TV’s that run off of AC power.
It
is therefore crucial that both forms of electricity transmission exist;
the world cannot be powered with one simple form. It then becomes a
vital matter for there to exist easy ways to transform DC to AC power
and vice versa in an efficient manner. Without this ability people will
be restricted to what electronic devices they use depending on the
electricity source available. Electrical AC/DC converters and DC/AC
inverters allow people this freedom in transferring electrical power
between the two.
Offline / standby
Inverters and Applications
Power
inverters are devices which can convert electrical energy of DC form
into that of AC. They come in all shapes and sizes, from low power
functions such as powering a car radio to that of backing up a building
in case of power outage. Inverters can come in many different varieties,
differing in price, power, efficiency and purpose. The purpose of a
DC/AC power inverter is typically to take DC power
supplied by a
battery, such as a 12 volt car battery, and transform it into a 220 volt
AC power source operating at 50Hz, emulating the power available at an
ordinary household electrical outlet. Power inverters are used today for
many tasks like powering appliances in a car such as cell phones,
radios and televisions. They also come in handy for consumers who own
camping vehicles, boats and at construction sites where an electric grid
may not be as accessible to hook into.
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ABSRACT - [ Total Page(s): 1 ]Uninterruptible power supplies (UPS) are used to provide power when regular utility power is unavailable. Although they are commonly used for providing power in remote locations or emergencies, this is not because they are the same as auxiliary power units, emergency power units or standby generators.Unlike the aforementioned power sources, UPS provides an immediate and continuous supply of power to a device, hence protecting it from power interruption and allowing time for auxiliary or emerge ... Continue reading---
