Abstract:
Automatic transfer switch is
electro-mechanical controllable apparatus used to
transfer electrical supply from utility netrvork to
sccondary supply such as gencrating set rvhcn
utility netrvork supply fails. This apparatus
automatically switches its contacts to utilify supply
if electricity from utility network returns back to
normal. Local-made automatic transfer switch for
portable generator is not available in the market,
however the imported one is offered at costly price.
This condition drives people.to use manual
transfer switches for controlling their portable
generators. This paper presents microcontroller rbased
automatic transfer switch for portable
generator wich is designed to meet cost effective
product. The design is based on ATNIEL
ATtiny2313 micro-controller platform with 2 (two)
units of 30-ampere power contactor as actuators so
that porver capacity of the apparatus reaches 6600
volt-amperes at 220 volt working voltage. Several
functional tests conducted in the laboratory show
that the apparatus successfully makes transition
between the two sources of electricity at the right
time-
